Artículos de revistas: "Surface acoustic wave (SAW) sensor"

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Joshi, S. G. "Surface-acoustic-wave (SAW) flow sensor". IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 38, n.º 2 (marzo de 1991): 148–54. http://dx.doi.org/10.1109/58.68472.

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Jeng, Ming-Jer, Mukta Sharma, Ying-Chang Li, Yi-Chen Lu, Chia-Yu Yu, Chia-Lung Tsai, Shiang-Fu Huang, Liann-Be Chang y Chao-Sung Lai. "Surface Acoustic Wave Sensor for C-Reactive Protein Detection". Sensors 20, n.º 22 (19 de noviembre de 2020): 6640. http://dx.doi.org/10.3390/s20226640.

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A surface acoustic wave (SAW) sensor was investigated for its application in C-reactive protein (CRP) detection. Piezoelectric lithium niobate (LiNbO3) substrates were used to study their frequency response characteristics in a SAW sensor with a CRP sensing area. After the fabrication of the SAW sensor, the immobilization process was performed for CRP/anti-CRP interaction. The CRP/anti-CRP interaction can be detected as mass variations in the sensing area. These mass variations may produce changes in the amplitude of sensor response. It was clearly observed that a CRP concentration of 0.1 μg/mL can be detected in the proposed SAW sensor. A good fitting linear relationship between the detected insertion loss (amplitude) and the concentrations of CRP from 0.1 μg/mL to 1 mg/mL was obtained. The detected shifts in the amplitude of insertion loss in SAW sensors for different CRP concentrations may be useful in the diagnosis of risk of cardiovascular diseases.

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Mukhin, Nikolay V. "Microfluidic Acoustic Metamaterial SAW Based Sensor". Journal of the Russian Universities. Radioelectronics 22, n.º 4 (1 de octubre de 2019): 75–81. http://dx.doi.org/10.32603/1993-8985-2019-22-4-75-81.

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Introduction. Microacoustic sensors based on surface acoustic wave (SAW) devices allow the sensor integration into a wafer based microfluidic analytical platforms such as lab-on-a-chip. Currently exist various approaches of application of SAW devices for liquid properties analysis. But this sensors probe only a thin interfacial liquid layer. The motivation to develop the new SAW-based sensor is to overcome this limitation. The new sensor introduced here uses acoustic measurements, including surface acoustic waves (SAW) and acoustic methamaterial sensor approaches. The new sensor can become the starting point of a new class of microsensor. It measures volumetric properties of liquid analytes in a cavity, not interfacial properties to some artificial sensor surface as the majority of classical chemical and biochemical sensors.Objective. The purpose of the work is to find solutions to overcome SAW-based liquid sensors limitations and the developing of a new sensor that uses acoustic measurements and includes a SAW device and acoustic metamaterial.Materials and methods. A theoretical analysis of sensor structure was carried out on the basis of numerical simulation using COMSOL Multiphysics software. Lithium niobate (LiNbO3) 127.86° Y-cut with wave propagation in the X direction was chosen as a substrate material. Microfluidic structure was designed as a set of rectangular shape channels. A method for measuring volumetric properties of liquids, based on SAW based fluid sensor concept, comprising the steps of: (a) providing sensor structure with the key elements: a SAW resonator, a high-Q set of liquid-filled cavities and intermediate layer with artificial elastic properties between them; (b) measuring of resonance frequency shift, associated with the resonance in liquid-filled cavity, in the response of weakly coupled resonators of SAW resonator loaded by periodic microfluidic structure; (c) determination of volumetric properties of the fluid on the basis of a certain relationship between the speed of sound in liquid, the resonant frequency of the set of liquid-filled cavities, and the geometry design of the cavity.Results. The new sensor approach is introduced. The eigenmodes of the sensor structure with a liquid analyte are carried out. The characteristic of sensor structure is determined. The key elements of introduced microfluidic sensor are a SAW structure, an acoustic metamaterial with a periodic set of microfluidic channels. The SAW device acts as electromechanical transducer. It excites surface waves propagating in the X direction lengthwise the periodic structure and detects the acoustic load generated by the microfluidic structure resonator. The origin of the sensor signal is a small frequency change caused by small variations of acoustic properties of the analyte within the set of microfluidic channels.Conclusion. The principle of the new microacoustic sensor, which can become the basis for creating a new class of microfluidic sensors, is shown.

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Li, Yuanyuan, Wenke Lu, Changchun Zhu, Qinghong Liu, Haoxin Zhang y Chenchao Tang. "Circuit Design of Surface Acoustic Wave Based Micro Force Sensor". Mathematical Problems in Engineering 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/701723.

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Pressure sensors are commonly used in industrial production and mechanical system. However, resistance strain, piezoresistive sensor, and ceramic capacitive pressure sensors possess limitations, especially in micro force measurement. A surface acoustic wave (SAW) based micro force sensor is designed in this paper, which is based on the theories of wavelet transform, SAW detection, and pierce oscillator circuits. Using lithium niobate as the basal material, a mathematical model is established to analyze the frequency, and a peripheral circuit is designed to measure the micro force. The SAW based micro force sensor is tested to show the reasonable design of detection circuit and the stability of frequency and amplitude.

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Länge, Kerstin. "Bulk and Surface Acoustic Wave Sensor Arrays for Multi-Analyte Detection: A Review". Sensors 19, n.º 24 (6 de diciembre de 2019): 5382. http://dx.doi.org/10.3390/s19245382.

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Bulk acoustic wave (BAW) and surface acoustic wave (SAW) sensor devices have successfully been used in a wide variety of gas sensing, liquid sensing, and biosensing applications. Devices include BAW sensors using thickness shear modes and SAW sensors using Rayleigh waves or horizontally polarized shear waves (HPSWs). Analyte specificity and selectivity of the sensors are determined by the sensor coatings. If a group of analytes is to be detected or if only selective coatings (i.e., coatings responding to more than one analyte) are available, the use of multi-sensor arrays is advantageous, as the evaluation of the resulting signal patterns allows qualitative and quantitative characterization of the sample. Virtual sensor arrays utilize only one sensor but combine it with enhanced signal evaluation methods or preceding sample separation, which results in similar results as obtained with multi-sensor arrays. Both array types have shown to be promising with regard to system integration and low costs. This review discusses principles and design considerations for acoustic multi-sensor and virtual sensor arrays and outlines the use of these arrays in multi-analyte detection applications, focusing mainly on developments of the past decade.

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Giffney, Timothy J., Y. H. Ng y K. C. Aw. "A Surface Acoustic Wave Ethanol Sensor with Zinc Oxide Nanorods". Smart Materials Research 2012 (26 de diciembre de 2012): 1–4. http://dx.doi.org/10.1155/2012/210748.

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Surface acoustic wave (SAW) sensors are a class of piezoelectric MEMS sensors which can achieve high sensitivity and excellent robustness. A surface acoustic wave ethanol sensor using ZnO nanorods has been developed and tested. Vertically oriented ZnO nanorods were produced on a ZnO/128∘ rotated Y-cut LiNbO3 layered SAW device using a solution growth method with zinc nitrate, hexamethylenetriamine, and polyethyleneimine. The nanorods have average diameter of 45 nm and height of 1 μm. The SAW device has a wavelength of 60 um and a center frequency of 66 MHz at room temperature. In testing at an operating temperature of 270 with an ethanol concentration of 2300 ppm, the sensor exhibited a 24 KHz frequency shift. This represents a significant improvement in comparison to an otherwise identical sensor using a ZnO thin film without nanorods, which had a frequency shift of 9 KHz.

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Pan, Yong, Qin Molin, Tengxiao Guo, Lin Zhang, Bingqing Cao, Junchao Yang, Wen Wang y Xufeng Xue. "Wireless passive surface acoustic wave (SAW) technology in gas sensing". Sensor Review 41, n.º 2 (22 de marzo de 2021): 135–43. http://dx.doi.org/10.1108/sr-03-2020-0061.

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Purpose This paper aims to give an overview about the state of wireless passive surface acoustic wave (SAW) gas sensor used in the detection of chemical vapor. It also discusses a variety of different architectures including delay line and array sensor for gas detection, and it is considered that this technology has a good application prospect. Design/methodology/approach The authors state the most of the wireless passive SAW methods used in gas sensing, such as CO2, CO, CH4, C2H4, NH3, NO2, et al., the sensor principles, design procedures and technological issues are discussed in detail; their advantages and disadvantages are also summarized. In conclusion, it gives a prospect of wireless passive SAW sensor applications and proposes the future research field might lie in the studying of many kinds of harmful gases. Findings In this paper, the authors will try to cover most of the important methods used in gas sensing and their recent developments. Although wireless passive SAW sensors have been used successfully in harsh environments for the monitoring of temperature or pressure, the using in chemical gases are seldom reported. This review paper gives a survey of the present state of wireless passive SAW sensor in gas detection and suggests new and exciting perspectives of wireless passive SAW gas sensor technology. Research limitations/implications The authors will review most of the methods used in wireless passive SAW sensor and discuss the current research status and development trend; the potential application in future is also forecasted. Originality/value The authors will review most of the methods used in wireless passive SAW sensor and discuss the current research status and development trend; the potential application in future is also forecasted.

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Wang, Wei Na y Qing Fan. "Tire Pressure Monitoring System and Wireless Passive Surface Acoustic Wave Sensor". Applied Mechanics and Materials 536-537 (abril de 2014): 333–37. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.333.

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The TPMS can not only save fuel and protect the tire, but also make the driver more safety. Tire safety is attracting the driver's attention, the United States had developed laws to enforce the TPMS installation in the car and the deadline is in 2008. In this paper, the basic structure and the implement method of TPMS are introduced. The active sensors are already used in most of the TPMS applications. The SAW theory and some wireless passive SAW pressure and temperature sensors which suit for the TPMS application are illustrated, because the passive sensor is becoming the focus in the TPMS research field. Passive SAW sensor is the good choice for TPMS, according to its wireless, passive, zero age rate, small size etc. The wireless passive SAW TPMS is one of the most important research direction. In this paper, some kinds of passive SAW sensor are introduced, which are used in TPMS.

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Hu, Baofa, Zhiwei Li, Yuanjie Wan, Peng Zhou, Chunquan Zhang y Haisheng San. "3D Printed Pressure Sensor Based on Surface Acoustic Wave Resonator". Measurement Science Review 21, n.º 3 (1 de junio de 2021): 76–81. http://dx.doi.org/10.2478/msr-2021-0011.

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Abstract This paper reports a 3-dimentional (3D) pressure sensor based on surface acoustic wave (SAW) resonators. The SAW resonators were designed and fabricated on 128°Y-X LiNbO3 substrate using the MEMS technology. The pressure sensing structure was 3D-printed using polyactic acid plastic, and two SAW resonators were integrated in the 3D-printed chamber structure for both temperature and pressure sensing. The SAW-based gas pressure sensors demonstrate a sensitivity of 589 ppm/MPa at the pressure range of 100-600 kPa and temperature of 40 °C.

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Ying, Zhi Hua, Jia Hu, Cong Ping Wu, Yi Qing Yang, Liang Zheng y Kai Xin Song. "Bilayer Structure Based Surface Acoustic Wave Sensor for Formaldehyde Detection". Advanced Materials Research 664 (febrero de 2013): 986–89. http://dx.doi.org/10.4028/www.scientific.net/amr.664.986.

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This study contributes to the measurements of formaldehyde at room temperature. A bilayer structure based surface acoustic wave (SAW) sensor has been fabricated and experimentally studied. The coating materials carbon nanotubes (CNTs) and poly (4-vinylphenol) (P4VP) were deposited by a spray-painting method onto SAW sensors configured as 433.92MHz two-port resonator-based oscillators. The results display high sensitivity and entirely reversibility. The response and recovery times of the bilayer structure are very short, and the response values are obviously greater than plus of the two single layers. Some sensing mechanisms between analytes and the bilayer structure SAW sensor will be discussed preliminarily.

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Ha, Nguyen Hai, Nguyen Hoang Nam, Dang Duc Dung, Nguyen Huy Phuong, Phan Duy Thach y Hoang Si Hong. "Hydrogen Gas Sensing Using Palladium-Graphene Nanocomposite Material Based on Surface Acoustic Wave". Journal of Nanomaterials 2017 (2017): 1–6. http://dx.doi.org/10.1155/2017/9057250.

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We report the fabrication and characterization of surface acoustic wave (SAW) hydrogen sensors using palladium-graphene (Pd-Gr) nanocomposite as sensing material. The Pd-Gr nanocomposite as sensing layer was deposited onto SAW delay line sensor-based interdigitated electrodes (IDTs)/aluminum nitride (AlN)/silicon (Si) structure. The Pd-Gr nanocomposite was synthesized by a chemical route and deposited onto SAW sensors by air-brush spraying. The SAW H2 sensor using Pd-Gr nanocomposite as a sensing layer shows a frequency shift of 25 kHz in 0.5% H2 concentration at room temperature with good repeatability and stability. Moreover, the sensor showed good linearity and fast response/recovery within ten seconds with various H2 concentrations from 0.25 to 1%. The specific interaction between graphene and SAW transfer inside AlN/Si structures yields a high sensitivity and fast response/recovery of SAW H2 sensor based on Pd-Gr/AlN/Si structure.

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Zhang, Kun, Wen Di Wang y Zhao Mei Qiu. "Research on the Surface Acoustic Wave Temperature Sensor". Applied Mechanics and Materials 543-547 (marzo de 2014): 1266–69. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.1266.

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This paper puts forward an idea of designing a surface acoustic wave (SAW) sensor to provide a research basis for subsequent researchers. We have made a SAW temperature sensor based on this idea. The experimental results demonstrated the feasibility of the idea, and shown that the frequency-temperature characteristic of the sensing unit is good and the temperature measurement accuracy of the testing unit is high.

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Liu, Boquan. "Super-resolution measurement method for passive wireless resonant surface acoustic wave sensor". Sensor Review 40, n.º 1 (27 de enero de 2020): 107–11. http://dx.doi.org/10.1108/sr-07-2019-0173.

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Purpose This study aims to use resonant surface acoustic wave (SAW) sensors, which have advantages in the harsh application environments, to measure different physical parameters such as temperature, pressure and force. For SAW sensors, the locality in measurement resolution by the effective time is poor, it cannot give the detailed results of SAW echoes. Design/methodology/approach To promote the application of SAW sensor, this paper proposes a convex program-based super-resolution measurement method to recover the missing spectral line and enhance frequency resolution. Findings The proposed method reduces the reliance on effective time and improves the measurement resolution of SAW sensors. The performance was validated by experiments. Originality/value The limited resolution capability restricts the benefit of SAW technology in harsh environments. The proposed method shed light on SAW measurement resolution increase, exploiting its full potential and leading to commercial applications.

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Hejczyk, Tomasz, Marian Urbańczyk, Tadeusz Pustelny y Wiesław Jakubik. "Numerical and Experimental Analysis of the Response of a SAW Structure with WO3 Layers on Action of Carbon Monoxide". Archives of Acoustics 40, n.º 1 (1 de marzo de 2015): 19–24. http://dx.doi.org/10.1515/aoa-2015-0003.

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Abstract The paper presents the results of an analysis of gaseous sensors based on a surface acoustic wave (SAW) by means of the equivalent model theory. The applied theory analyzes the response of the SAW sensor in the steady state affected by carbon monoxide (CO) in air. A thin layer of WO3 has been used as a sensor layer. The acoustical replacing impedance of the sensor layer was used, which takes into account the profile of the concentration of gas molecules in the layer. Thanks to implementing the Ingebrigtsen equation, the authors determined analytical expressions for the relative changes of the velocity of the surface acoustic wave in the steady state. The results of the analysis have shown that there is an optimum thickness of the layer of CO sensor at which the acoustoelectric effect (manifested here as a change in the acoustic wave velocity) is at its highest. The theoretical results were verified and confirmed experimentally

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Palla-Papavlu, Alexandra, Stefan Ioan Voicu y Maria Dinescu. "Sensitive Materials and Coating Technologies for Surface Acoustic Wave Sensors". Chemosensors 9, n.º 5 (10 de mayo de 2021): 105. http://dx.doi.org/10.3390/chemosensors9050105.

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Since their development, surface acoustic wave (SAW) devices have attracted much research attention due to their unique functional characteristics, which make them appropriate for the detection of chemical species. The scientific community has directed its efforts toward the development and integration of new materials as sensing elements in SAW sensor technology with a large area of applications, such as for example the detection of volatile organic compounds, warfare chemicals, or food spoilage, just to name a few. Thin films play an important role and are essential as recognition elements in sensor structures due to their wide range of capabilities. In addition, other requisites are the development and application of new thin film deposition techniques as well as the possibility to tune the size and properties of the materials. This review article surveys the latest progress in engineered complex materials, i.e., polymers or functionalized carbonaceous materials, for applications as recognizing elements in miniaturized SAW sensors. It starts with an overview of chemoselective polymers and the synthesis of functionalized carbon nanotubes and graphene, which is followed by surveys of various coating technologies and routes for SAW sensors. Different coating techniques for SAW sensors are highlighted, which provides new approaches and perspective to meet the challenges of sensitive and selective gas sensing.

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Shevchenko, Sergey, Alexander Kukaev, Maria Khivrich y Dmitry Lukyanov. "Surface-Acoustic-Wave Sensor Design for Acceleration Measurement". Sensors 18, n.º 7 (16 de julio de 2018): 2301. http://dx.doi.org/10.3390/s18072301.

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We suggest a concept design of a SAW-based microaccelerometer with an original triangular-shaped console-type sensing element. Our design is particularly optimized to increase the robustness against positioning errors of the SAW resonators on the opposite sides of the console. We also describe the results of computer simulations and laboratory tests that are in a perfect agreement with each other and present the sensitivity characteristics of a manufactured experimental design device.

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Pan, Yong, Ning Mu, Bo Liu, Bingqing Cao, Wen Wang y Liu Yang. "A Novel Surface Acoustic Wave Sensor Array Based on Wireless Communication Network". Sensors 18, n.º 9 (6 de septiembre de 2018): 2977. http://dx.doi.org/10.3390/s18092977.

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A novel surface acoustic wave (SAW) sensor array based on wireless communication network is prepared. The array is composed of four SAW sensors, a wireless communication network module, and a global positioning system (GPS) module. The four SAW sensors of the array are coated with triethanolamine, polyepichlorohydrin, fluoroalcoholpolysiloxane, and L-glutamic acid hydrochloride to detect hydrogen sulfide (H2S), 2-chloroethyl ethyl sulfide (CEES), dimethylmethylphosphonate (DMMP), and ammonia (NH3) at film thicknesses of 50–100 nm. The wireless communication network module consists of an acquisition unit, a wireless control unit, and a microcontroller unit. By means of Zigbee and Lora technologies, the module receives and transmits the collected data to a PC work station in real-time; moreover, the module can control the sensor array’s working mode and monitor the working status. Simultaneously, the testing location is determined by the GPS module integrated into the SAW sensor array. H2S, CEES, DMMP, and NH3 are detected in 300 m at different concentrations. Given the practical future application in environment in the future, the low, safe concentrations of 1.08, 0.59, 0.10, and 5.02 ppm for H2S, CEES, DMMP, and NH3, respectively, are detected at the lowest concentration, and the sensitivities of different sensors of the sensor array are 32.4, 14.9, 78.1 and 22.6 Hz/ppm, respectively. With the obtained fingerprints and pattern recognition technology, the detected gases can be recognized.

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Zhang, Guigen. "Nanostructure-Enhanced Surface Acoustic Waves Biosensor and Its Computational Modeling". Journal of Sensors 2009 (2009): 1–11. http://dx.doi.org/10.1155/2009/215085.

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Surface acoustic wave (SAW) devices are considered to be very promising in providing a high-performance sensing platform with wireless and remote operational capabilities. In this review, the basic principles of SAW devices and Love-mode SAW-based biosensors are discussed first to illustrate the need for surface enhancement for the active area of a SAW sensor. Then some of the recent efforts made to incorporate nanostructures into SAW sensors are summarized. After that, a computational approach to elucidate the underlying mechanism for the operations of a Love-mode SAW biosensor with nanostructured active surface is discussed. Finally, a modeling example for a Love-mode SAW sensor with skyscraper nanopillars added to in its active surface along with some selected results is presented.

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Chen, Jinkai, Wenbo Wang, Weipeng Xuan, Xiaozhi Wang, Shurong Dong, Sean Garner, Pat Cimo y Jikui Luo. "Flexible surface acoustic wave broadband strain sensors based on ultra-thin flexible glass substrate". MRS Advances 1, n.º 21 (2016): 1519–24. http://dx.doi.org/10.1557/adv.2016.110.

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ABSTRACTFlexible SAW devices based on ZnO piezoelectric thin film deposited on ultra-thin flexible glass were fabricated and their performances as a strain sensor have been investigated. The XRD and AFM characterizations showed that the ZnO layers have good crystal quality and smooth surface. The flexible SAW devices show excellent strain sensitivity which increases from ∼87 to ∼137 Hz/με with the increasing ZnO thickness, and the sensors can withstand strains up to ∼3000 με, 4∼6 times larger than those of SAW strain sensors on rigid substrates. The sensors exhibited remarkable stability up to hundreds of times bending under large strains. The effects of environmental variables (temperature, humidity, UV light) on the sensor performance have been investigated. The temperature has a significant effect on the performance of the SAW strain sensor, while humidity and light have limited effect.

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Samarentsis, Anastasios G., Alexandros K. Pantazis, Achilleas Tsortos, Jean-Michel Friedt y Electra Gizeli. "Hybrid Sensor Device for Simultaneous Surface Plasmon Resonance and Surface Acoustic Wave Measurements". Sensors 20, n.º 21 (29 de octubre de 2020): 6177. http://dx.doi.org/10.3390/s20216177.

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Surface plasmon resonance (SPR) and Love wave (LW) surface acoustic wave (SAW) sensors have been established as reliable biosensing technologies for label-free, real-time monitoring of biomolecular interactions. This work reports the development of a combined SPR/LW-SAW platform to facilitate simultaneous optical and acoustic measurements for the investigation of biomolecules binding on a single surface. The system’s output provides recordings of two acoustic parameters, phase and amplitude of a Love wave, synchronized with SPR readings. We present the design and manufacturing of a novel experimental set-up employing, in addition to the SPR/LW-SAW device, a 3D-printed plastic holder combined with a PDMS microfluidic cell so that the platform can be used in a flow-through mode. The system was evaluated in a systematic study of the optical and acoustic responses for different surface perturbations, i.e., rigid mass loading (Au deposition), pure viscous loading (glycerol and sucrose solutions) and protein adsorption (BSA). Our results provide the theoretical and experimental basis for future application of the combined system to other biochemical and biophysical studies.

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Kim, Eunhyun, Jinuk Kim, Seonggyun Ha, Changsik Song y Joo-Hyung Kim. "Improved Performance of Surface Acoustic Wave Sensors by Plasma Treatments for Chemical Warfare Agents Monitoring". Journal of Nanoscience and Nanotechnology 20, n.º 11 (1 de noviembre de 2020): 7145–50. http://dx.doi.org/10.1166/jnn.2020.18850.

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The effects of a plasma treatment on the sensing performance of surface acoustic wave (SAW) sensors to detect chemical warfare agents (CWAs) were investigated. SAW sensors designed for an operating frequency of 250 MHz were fabricated using lift-off techniques followed by the deposition of a very thin thiourea (TU) layer as a sensing film on the sensing area of the SAW sensor. To achieve some advantages from the plasma treatment on the surface, such as cleaning, surface activation and modification, a post-plasma treatment was performed on the sensing layer and the sensing performance of the SAW sensor was measured by a comparison with the measured responses, providing different simulant gases through the gas feeding system. The sensitivity test revealed significant improvement in the sensing ability of the SAW sensor to detect DMMP, a simulant of a CWA, but with a relatively longer recovery time. The responses of other simulants at different concentrations and different simulant vapors were compared. The results showed that a plasma treatment on the sensing layer of a SAW device can improve the selectivity and sensitivity to a certain target gas or some volatile organic compounds. Therefore, a plasma treatment will be very useful for improving the selectivity and sensitivity of SAW sensors for the detection of CWAs.

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Filipiak, Jerzy, Lech Solarz y Grzegorz Steczko. "Surface Acoustic Wave (SAW) Vibration Sensors". Sensors 11, n.º 12 (19 de diciembre de 2011): 11809–32. http://dx.doi.org/10.3390/s111211809.

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Sun, Ping, Xing Feng y Zhong Hua Ou. "Simulation of a Surface Acoustic Wave Methane Sensor". Applied Mechanics and Materials 373-375 (agosto de 2013): 354–57. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.354.

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Study on the working principle of the surface acoustic wave (SAW) methane sensor. Establish the physical and chemical model of sensitive mechanism based on the mass-effect and the adsorption characteristics of gas on the sensitive membrane. The linear solvation energy relationship (LSER) has been developed to describe and quantify these various interactions. Simulate the mass-sensitive gas sensor based on COMSOL multiphysics software. The simulation significantly reduces the amount of prototype experiments, sensor development cycle and development costs.

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SCHMIDT, F. y G. SCHOLL. "WIRELESS SAW IDENTIFICATION AND SENSOR SYSTEMS". International Journal of High Speed Electronics and Systems 10, n.º 04 (diciembre de 2000): 1143–91. http://dx.doi.org/10.1142/s0129156400000738.

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Identification and sensor systems based on surface acoustic waves exhibit intriguing properties which have hitherto remained unexploited by semiconductor-based systems. They offer a long readout distance of up to more than 20 meters with purely passive surface acoustic wave (SAW) devices. SAW devices operate with no battery or wiring, withstand extreme temperatures and work reliably and maintenance-free over many decades even in harsh industrial environments. Because they operate at frequencies in the GHz range, SAW identification and sensor systems are well protected from the electromagnetic interference that often occurs in the vicinity of industrial equipment such as motors and high-voltage lines. The fundamentals and design rules of numerous passive wireless SAW sensor and identification systems for industrial and domestic applications as well as relevant practical work will be presented.

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Puiu, Mihaela, Lucian-Gabriel Zamfir, Valentin Buiculescu, Angela Baracu, Cristina Mitrea y Camelia Bala. "Significance Testing and Multivariate Analysis of Datasets from Surface Plasmon Resonance and Surface Acoustic Wave Biosensors: Prediction and Assay Validation for Surface Binding of Large Analytes". Sensors 18, n.º 10 (19 de octubre de 2018): 3541. http://dx.doi.org/10.3390/s18103541.

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In this study, we performed uni- and multivariate data analysis on the extended binding curves of several affinity pairs: immobilized acetylcholinesterase (AChE)/bioconjugates of aflatoxin B1(AFB1) and immobilized anti-AFB1 monoclonal antibody/AFB1-protein carriers. The binding curves were recorded on three mass sensitive cells operating in batch configurations: one commercial surface plasmon resonance (SPR) sensor and two custom-made Love wave surface-acoustic wave (LW-SAW) sensors. We obtained 3D plots depicting the time-evolution of the sensor response as a function of analyte concentration using real-time SPR binding sensograms. These “calibration” surfaces exploited the transient periods of the extended kinetic curves, prior to equilibrium, creating a “fingerprint” for each analyte, in considerably shortened time frames compared to the conventional 2D calibration plots. The custom-made SAW sensors operating in different experimental conditions allowed the detection of AFB1-protein carrier in the nanomolar range. Subsequent statistical significance tests were performed on unpaired data sets to validate the custom-made LW-SAW sensors.

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Viespe, Dinca, Popescu-Pelin y Miu. "Love Wave Surface Acoustic Wave Sensor with Laser-Deposited Nanoporous Gold Sensitive Layer". Sensors 19, n.º 20 (16 de octubre de 2019): 4492. http://dx.doi.org/10.3390/s19204492.

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Laser-deposited gold immobilization layers with different porosities were incorporated into Love Wave Surface Acoustic Wave sensors (LW-SAWs). Acetylcholinesterase (AChE) enzyme was immobilized onto three gold interfaces with different morphologies, and the sensor response to chloroform was measured. The response of the sensors to various chloroform concentrations indicates that their sensing properties (sensitivity, limit of detection) are considerably improved when the gold layers are porous, in comparison to a conventional dense gold layer. The results obtained can be used to improve properties of SAW-based biosensors by controlling the nanostructure of the gold immobilization layer, in combination with other enzymes and proteins, since the design of the present sensor is the same as that for a Love Wave biosensor.

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Tan, Jia Jun, Zhou Wan, Xin Xiong, Fei Li y Shi Li. "Study on Surface Acoustic Wave Air Flow Sensor for Vehicle". Applied Mechanics and Materials 241-244 (diciembre de 2012): 822–27. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.822.

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Air-fuel ratio, a major parameter of petrol engineer, directly affects the power, economy and indicators of exhaust emission of engine. To make the air-fuel ratio in the best state, the air flow entering into cylinder must be measured accurately. Due to gaseous property of air itself, the flow detection is greatly interfered by temperature and pressure. In the article, we used surface acoustic wave(SAW) technique combined with temperature and pressure compensation and made a detection device for engine intake, which was less interfered by temperature and pressure with high accuracy and wide measuring range. The paper introduced the working principle of SAW air flow sensor and its mathematic model, and discussed the development, signal detection and error processing of sensor. The results showed that SAW sensor could better overcome the interference of temperature and pressure, and then accurately got the air flow value of engine with preferable repeatability and reliability.

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Xu, Sheng, Rui Zhang, Junpeng Cui, Tao Liu, Xiuli Sui, Meng Han, Fu Zheng y Xiaoguang Hu. "Surface Acoustic Wave DMMP Gas Sensor with a Porous Graphene/PVDF Molecularly Imprinted Sensing Membrane". Micromachines 12, n.º 5 (12 de mayo de 2021): 552. http://dx.doi.org/10.3390/mi12050552.

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In this paper, surface acoustic wave (SAW) sensors containing porous graphene/PVDF (polyvinylidene fluoride) molecularly imprinted sensitive membrane for DMMP gas detection were investigated. A 433 MHz ST-cut quartz SAW resonator was used to convert gas concentration changes into frequency shifts by the sensors. The porous graphene/PVDF film was fabricated on the sensor’s surface by using the tape-casting method. DMMP molecules were adsorbed on the porous structure sensing film prepared by the 2-step method to achieve the specific recognition effect. The sensitivity of the sensor could reach −1.407 kHz·ppm−1. The response time and recovery time of the SAW sensor with porous graphene/PVDF sensing membrane were about 4.5 s and 5.8 s at the concentration of 10 ppm, respectively. The sensor has good anti-interference ability to most gases in the air.

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Constantinoiu, Izabela, Dana Miu y Cristian Viespe. "Surface Acoustic Wave Sensors for Ammonia Detection at Room Temperature Based on SnO2/Co3O4 Bilayers". Journal of Sensors 2019 (19 de mayo de 2019): 1–6. http://dx.doi.org/10.1155/2019/8203810.

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The selectivity of a SAW (surface acoustic wave) sensor, with a Co3O4 sensitive thin film for NH3 (ammonia) and the influence of SnO2 on its sensitivity, was studied. Thin films were deposited by pulsed laser deposition (PLD) on quartz SAW sensor substrates. Two sensors with different types of sensitive films were developed: a Co3O4 thin film sensor (S1) and a SnO2/Co3O4 thin film sensor (S2). The sensitive films were deposited in conditions which ensured a porous structure. The sensors were tested in the presence of three gases: NH3, methanol, and toluene. The selectivity of Co3O4 for NH3 was determined from the difference in the frequency shifts of the sensor for NH3 and for VOCs (volatile organic compounds). The positive influence of SnO2 on the sensitivity of sensor S2 was observed from the lower limit of detection (LOD) of this sensor and from the differences in frequency shifts between sensor S1 and sensor S2.

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Furuya, Yasubumi y Teiko Okazaki. "Development of Multi-Ferroic Actuator/Sensor Material and Device for Intelligent/Smart Technology - Basic Design and Experimental Verification". Advances in Science and Technology 54 (septiembre de 2008): 187–94. http://dx.doi.org/10.4028/www.scientific.net/ast.54.187.

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Technical importance of multi-ferroic approach for designing advanced multi-functional actuator/sensors based on a mutual coupling effect between ferroic material elements is pointed out for intelligent/smart technology. Two types of multi-ferroic actuator/sensor devices. i.e. (1) magnetically driven composite actuator and (2) multi-functional surface acoustic wave (SAW) sensor by MEMS are presented. First, a large-scale robust composite actuator is the composite structure which is reinforced by the superelastic fiber or lamellar of shape memory alloys (TiNi) in the ferromagnetic metal (Ni) matrix. This multi-ferroic composite can be driven with high speed as well as considerably enhanced strain by applying a wireless magnetic field. Secondarily, multi-functionally designed, multi-ferroic senor device using surface acoustic wave (SAW) is introduced. On the surface part between IDTs, environmentally active material films such as SMA, FSMA, magnetostrictive alloy etc. are formed by magnetron-sputtering. Various environmental sensing parameters i.e. temperature, magnetic field strength, stress, loading hysteresis and internal damage etc. can be evaluated nondestructively from the signal analysis of amplitude and phase change of SAW. Consequently, these results show the promising new types of multi-functional composite actuator and sensor based on multi-ferroic effect.

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He, X. L., J. Zhou, W. B. Wang, W. P. Xuan, D. J. Li, S. R. Dong, H. Jin, Y. Xu y J. K. Luo. "Flexible Surface Acoustic Wave Based Temperature and Humidity Sensors". MRS Proceedings 1659 (2014): 75–80. http://dx.doi.org/10.1557/opl.2014.111.

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ABSTRACTFlexible surface acoustic wave (SAW) based temperature and humidity sensors were fabricated and characterized. ZnO piezoelectric films were deposited on polyimide substrates by DC magnetron sputtering. ZnO films possess (0002) crystal orientation with large grain sizes of 50∼70 nm. SAW devices showed two wave modes, namely the Rayleigh and Lamb modes, with the frequencies at fR ∼132MHz and fL∼427MHz respectively for a wavelength of 12 μm device. The two resonant frequencies have a temperature coefficient of frequency (TCF) of −423ppm/K and −258ppm/K for the Rayleigh and Lamb waves, respectively. The SAW sensors exhibited a good repeatability in responding to cyclic change of humidity. The responses of the sensors increase with the increase in humidity, and the sensitivity increases with the decrease in wavelength. A high sensitivity of 34.7 kHz/10%RH has been obtained from a SAW device without any surface treatment, demonstrated that the flexible SAW humidity sensors are very promising for application in flexible sensors and microsystems.

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Dbibih, Fatima-Ezzahraa, Meddy Vanotti, Valerie Soumann, Jean-Marc Cote, Lyes Djoumi y Virginie Blondeau-Patissier. "Measurement of PM10 and PM2.5 Using SAW Sensors-Based Rayleigh Wave and Love Wave". Engineering Proceedings 6, n.º 1 (17 de mayo de 2021): 81. http://dx.doi.org/10.3390/i3s2021dresden-10129.

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Particulate matter (PM) is reported to be dangerous and can cause respiratory and health issues. Regulations, based on PM concentration, have been implemented to limit human exposition to air pollution. An innovative system with surface acoustic wave (SAW) sensors combined with a 3 Lpm cascade impactor was developed by our team for real time mass concentration measurements. In this study, we compare the PM sensitivity of two types of SAW sensors. The first one consists of delay lines based on Rayleigh waves propagating on a Lithium Niobate Y-X 128° substrate. The second one is a based-on Love waves on AT-Quartz. Aerosols were generated from NaCl for PM2.5 and from Silicon carbide for PM10. The sensors’ responses was compared to a reference sensor based on optical measurements. The sensitivity of the Rayleigh wave-based sensor is clearly lower than the Love wave sensor for both PMs. Although less sensitive, Rayleigh wave sensors remain very promising for the development of self-cleaning sensors using RF power due to their high electromechanical factor. To check the performance of our system in real conditions, we tested the sensitivity to PM from cigarette smoke using Rayleigh SAW. The PM2.5 stage showed a phase shift while the PM10 did not respond. This result agrees with previous studies which reported that the size of particles from cigarette smoke varies between 0.1 to 1.5 µm. A good correlation between the reference sensor’s response and the phase variation of SAW sensors was obtained.

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Cao, Bing Qing, Qi Bin Huang, Yong Pan y Mo Lin Qin. "The Respond Characteristic Property in Different Temperatures of SAW Sensor with p-tertbutylcalix[4]arene Coatings to Detect DMMP". Advanced Materials Research 1015 (agosto de 2014): 590–93. http://dx.doi.org/10.4028/www.scientific.net/amr.1015.590.

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This paper presents new effective approachs for the supermolecule film deposition of surface acoustic wave (SAW) chemical sensors for detecting DMMP. 25-(thioalkyl-alkoxy)-p-tertbutylcalix [4] arene self-assembly molecular imprinted film as the sensitive film was coated on the gold delay line of SAW sensors to detect DMMP. The sensor has special response to organoosphorus compounds and the respond characteristic property in different temperatures of SAW sensor was studied in detail, had important reference value in counter-terrorism.

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Xu, Zhangliang y Yong J. Yuan. "Quantification ofStaphylococcus aureususing surface acoustic wave sensors". RSC Advances 9, n.º 15 (2019): 8411–14. http://dx.doi.org/10.1039/c8ra09790a.

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Quartz crystal microbalance (QCM), surface acoustic wave (SAW)-Rayleigh and ZnO based SAW-Love sensors were fabricated and their sensitivity was comparatively analyzed for the quantification ofStaphylococcus aureus(S. aureus).

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Mazzamurro, Aurelien, Abdelkrim Talbi, Yannick Dusch, Omar Elmazria, Philippe Pernod, Olivier Bou Matar y Nicolas Tiercelin. "Highly Sensitive Surface Acoustic Wave Magnetic Field Sensor Using Multilayered TbCo2/FeCo Thin Film". Proceedings 2, n.º 13 (30 de noviembre de 2018): 902. http://dx.doi.org/10.3390/proceedings2130902.

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Over the last decades, the use of Surface Acoustic Waves (SAW) has emerged as a promising technology in many applications such as filters, signal processing but also sensors. We report the fabrication and the characterization of a SAW delay line magnetic field sensor using uniaxial multi-layered 14×[TbCo2(3.7nm)/FeCo(4nm)] nanostructured thin film deposited on Y36° Lithium Niobate (Figure 1a). The sensor shows an interesting dependency to a tunable bias magnetic field with different orientations relative to the easy axis. The obtained results are well explained using an equivalent piezo-magnetic model described in a previous work.

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Hu, You Wang, Ji Wen Xiang y Xiao Yan Sun. "Temperature Compensation Experiment of Love Wave Sensor". Advanced Materials Research 490-495 (marzo de 2012): 673–77. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.673.

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Love wave sensor is one of the most promising SAW sensors for liquid detection, because of acoustic energy can be confined in sensing surface by waveguide layer of Love wave sensor, which resulted in higher sensitivity to surface perturbations. Temperature coefficient of frequency (TCF) has deep effect on effective sensitivity of Love wave sensor. In order to improve the performance of Love wave sensor, the theoretical relationship of TCF on substrates and guiding layers temperature properties is researched. It found that reasonable combinations of substrates and guiding layers was a feasible method to obtain effective temperature compensation, and experimental TCF of sensitive element is reduced to 0.75ppm/°C by this method.

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Yang, Jian y Hejuan Chen. "A novel method of studying the micro-contact using surface acoustic wave sensor". Sensor Review 36, n.º 4 (19 de septiembre de 2016): 421–28. http://dx.doi.org/10.1108/sr-10-2015-0162.

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Purpose This paper aims to investigate the response behavior of the surface acoustic wave (SAW) sensor under the loading of micro-particles and to evaluate the feasibility of using the SAW sensor to study the micro-contact of the particle–plane interface. Design/methodology/approach An analytical perturbation theory of the coupled system of particle and SAW is presented. It shows that in the weak-coupling regime, the SAW sensor detects the coupling stiffness rather than the additional mass of the particle at the interface. The frequency perturbation formula expressed in parameters of the geometry and mechanical properties of the contact is further derived. The frequency shift of a 262-MHz Rayleigh-type SAW in the oscillation configuration under the loading of multiple starch particles of different sizes has been measured. Findings The experiment results of a linear relationship between the frequency increase and the sum of the radius of particles to the power of 2/3 verified the validity of the theory of linking the SAW response to the geometry and mechanical properties of the contact. Originality/value The SAW sensor could serve as a new candidate for studying the details of mechanical properties of the micro-contact of the interface.

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Yamanaka, Kazushi, Noritaka Nakaso, Dongyoun Sim y Takeshi Fukiura. "Principle and application of ball surface acoustic wave (SAW) sensor". Acoustical Science and Technology 30, n.º 1 (2009): 2–6. http://dx.doi.org/10.1250/ast.30.2.

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Mohamad Ashari, Zainab, Fatini Sidek y Anis Nurashikin Nordin. "TEMPERATURE CONTROL CIRCUIT FOR SURFACE ACOUSTIC WAVE (SAW) RESONATORS". IIUM Engineering Journal 12, n.º 2 (18 de octubre de 2011): 99–110. http://dx.doi.org/10.31436/iiumej.v12i2.47.

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Surface Acoustic Wave (SAW) resonators are key components in oscillators, frequency synthesizers and transceivers. One of the drawbacks of SAW resonators are that its piezoelectric substrates are highly sensitive to ambient temperature resulting in performance degradation. This work propose a simple circuit design which stabalizes the temperature of the SAW resonator, making it independet of temperature change. This circuit is based on the oven control method which elevates the temperature of the resonator to a high temperature, making it tolerant to minor changes in ambient temperature.This circuit consist of a temperature sensor, heaters and a comparator which turn the heater on or off depending on the ambient temperature. Several SAW resonator were tested using this circuit. Experimental results indicate the temperature coefficient of frequency (TCF) decreases from maximum of 130.44/Â°C to a minimum of -1.11/Â°C.Â

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Jeng, Ming-Jer, Ying-Chang Li, Mukta Sharma, Chia-Wei Chen, Chia-Lung Tsai, Yen-Heng Lin, Shiang-Fu Huang, Liann-Be Chang y Chao-Sung Lai. "A Surface Acoustic Wave Sensor with a Microfluidic Channel for Detecting C-Reactive Protein". Chemosensors 9, n.º 5 (10 de mayo de 2021): 106. http://dx.doi.org/10.3390/chemosensors9050106.

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A surface acoustic wave (SAW) sensor with a microfluidic channel was studied to detect C-reactive protein (CRP). A piezoelectric lithium niobate substrate was used to examine the frequency response of the microfluidic SAW sensor. The amplitude (insertion loss) changes in the microfluidic SAW sensor were measured from the interaction of CRP/anti-CRP owing to mass variation. The fabricated microfluidic SAW sensor exhibited a detection limit of 4 ng/mL CRP concentration. A wide CRP concentration range (10 ng/mL to 0.1 mg/mL) can be detected by this sensor, which is higher than the existing CRP detection methods. A good linear relationship between the amplitude peak shift and CRP concentrations from 10 ng/mL to 0.1 mg/mL was obtained. The amplitude peak shifts in the sensor can be useful for estimating CRP concentration. This can be used as a biosensor to diagnose the risk of cardiovascular disease.

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41

Ten, Seng Teik, Uda Hashim, Ahmad Sudin, Wei Wen Liu, Kai Loong Foo, N. H. M. Salleh, Hashim Hisham y T. Nazwa. "Modeling Development of a High-Sensitivity Escherichia coli O157:H7 Detection Based on SH SAW Sensor". Advanced Materials Research 925 (abril de 2014): 595–99. http://dx.doi.org/10.4028/www.scientific.net/amr.925.595.

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Surface acoustic waves based devices were initially developed for the telecommunication purpose such as signal filters and resonators. The acoustic energy is strongly confined on the surface of the surface acoustic waves (SAW) based devices and consequent their ultra-sensitivity to the surface perturbation. This has made SAW permits the highly sensitive detection of utterly diminutive charges on the surface. Hence, SAW based devices have been modified to be sensors. Food contamination has become critical issue and sensitive detection devices are needed urgently as small amount of harmful bacterial pathogens such as Escherichia coli (E.coli) O157:H7with the dose fewer than 100 organisms in food products or water is enough to cause serious gastrointestinal illness to human. Therefore, ultra-high sensitive, label free biosensors have been designed in this research for the low concentration E.coli detection. After the saturated development in telecommunication filed, SAW sensors were developed for gas detections and have been moving towards biological detections recently. Shear horizontal surface acoustic wave (SHSAW), one of the SAW based types is most suitable for the liquid based application as it has the advantage of acoustic energy is not being radiated into liquid. Therefore, SHSAW device has the potential to provide high-performance sensing platform in this research. There have been a lot of complicated theoretical models for the SAW devices development since 1960 as signal filters and resonators such as from delta function model, equivalent circuit model, to the current SAW models such as coupling-of-modes (COM) model, P-matrix model and finite element analysis (FEA) model. However, SHSAW device in this research is not meant for signal filter or resonators but used for surface sensing purpose, therefore the simplicity method of the modeling is presented in the paper for the E.coli detection sensor development.

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42

Voinova, Marina V. "On Mass Loading and Dissipation Measured with Acoustic Wave Sensors: A Review". Journal of Sensors 2009 (2009): 1–13. http://dx.doi.org/10.1155/2009/943125.

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We summarize current trends in the analysis of physical properties (surface mass density, viscosity, elasticity, friction, and charge) of various thin films measured with a solid-state sensor oscillating in a gaseous or liquid environment. We cover three different types of mechanically oscillating sensors: the quartz crystal microbalance with dissipation (QCM-D) monitoring, surface acoustic wave (SAW), resonators and magnetoelastic sensors (MESs). The fourth class of novel acoustic wave (AW) mass sensors, namely thin-film bulk acoustic resonators (TFBARs) on vibrating membranes is discussed in brief. The paper contains a survey of theoretical results and practical applications of the sensors and includes a comprehensive bibliography.

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43

Ma, Jin Yi, Jing Yang, Bo Du, Lu Wang, Hong Min Jiang y Jie He. "Design of SAW Specific Gas Sensor with High Sensitivity". Applied Mechanics and Materials 303-306 (febrero de 2013): 137–42. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.137.

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To improve the temperature stability, response speed and sensitivity of surface acoustic wave (SAW) gas sensor, the relationship between the sensing region of the resonator for SAW gas sensor and the sensitivity of sensor is studied, a specific resonator with big space topology structure is proposed. A SAW resonator with high temperature stability is investigated from the viewpoint of piezoelectric material, cut type and fabrication process. A nano-wire bundle based SAW gas sensor with big specific-surface-area is proposed.

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Pérez, Leonardo Andrés y Carlos Alberto Vera. "Método para Medir Indirectamente la Velocidad de Fase en Sensores Surface Acoustic Wave". Publicaciones e Investigación 9 (22 de octubre de 2015): 65. http://dx.doi.org/10.22490/25394088.1434.

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El sensor de temperatura Surface Acoustic Wave (SAW) ofrece amplias posibilidades para ser utilizado en ambientes hostiles. En teoría, las mediciones del SAW se pueden leer inalámbricamente sin integrar circuitos electrónicos en su estructura, permitiendo funcionalidades en mediciones a muy altas temperaturas. La literatura reporta que las variaciones de temperatura del SAW ocasionan corrimientos en su frecuencia de sincronismo, efecto que se atribuye a la sensibilidad térmica de la velocidad de fase del substrato piezoeléctrico. Caracterizar apropiadamente el SAW requiere una buena medición de la velocidad de fase. No obstante, medir esta velocidad con respecto a la temperatura no es posible con la instrumentación actual. Este artículo reporta un método indirecto para medir estas variaciones de velocidad a través de simulaciones basadas en el Modelo de Mason y mediciones de la respuesta en frecuencia de un prototipo SAW. Identificar la velocidad de fase del SAW conlleva a graficar, con aceptable precisión, la curva de funcionamiento del sensor, la cual puede utilizarse posteriormente como curva de calibración.

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45

Chen, Zhenglin, Qiaozhen Zhang, Congcong Li, Sulei Fu, Xiaojun Qiu, Xiaoyu Wang y Haodong Wu. "Geometric Nonlinear Model for Prediction of Frequency–Temperature Behavior of SAW Devices for Nanosensor Applications". Sensors 20, n.º 15 (29 de julio de 2020): 4237. http://dx.doi.org/10.3390/s20154237.

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Surface acoustic wave (SAW)-based sensors have become highly valued for their use as nanosensors in industrial applications. Accurate prediction of the thermal stability is a key problem for sensor design. In this work, a numerical tool based on the finite element method combined with piezoelectric Lagrangian equations has been developed to accurately predict the thermal sensitivity characteristics of surface acoustic wave devices. Theoretical analysis for the geometric nonlinearity contributing to the frequency–temperature characteristic and material constants’ dependency on temperature were taken into consideration. The thermomechanical equilibrium equation built on the three-dimensional finite element method (3D-FEM) mesh node took mesh movement into account because thermal expansion was employed. The frequency–temperature characteristics of different SAW modes, including Rayleigh waves and leaky waves excited on a piezoelectric substrate of quartz or lithium tantalate, respectively, were calculated. The theoretical accuracy of the proposed numerical tool was verified by experiments.

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46

Tian, Yahui, Honglang Li, Wencan Chen, Zixiao Lu, Wei Luo, Xihui Mu y Litian Wang. "A Novel Love Wave Mode Sensor Waveguide Layer with Microphononic Crystals". Applied Sciences 11, n.º 17 (1 de septiembre de 2021): 8123. http://dx.doi.org/10.3390/app11178123.

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Surface acoustic wave (SAW) sensors have been applied in various areas with many advantages, such as their small size, high sensitivity and wireless and passive form. Love wave mode sensors, an important kind of SAW sensor, are mostly used in biology and chemistry monitoring, as they can be used in a liquid environment. Common Love wave mode sensors consist of a delay line with waveguide and sensitive layers. To extend the application of Love wave mode sensors, this article reports a novel Love wave mode sensor consisting of a waveguide layer with microphononic crystals (PnCs). To analyze the properties of the new structure, the band structure was calculated, and transmission was obtained by introducing delay line structures and quasi-three-dimensional models. Furthermore, devices with a traditional structure and novel structure were fabricated. The results show that, by introducing the designed microstructure of phononic crystals in the waveguide layer, the attenuation was barely increased, and the frequency was shifted by a small amount. In the liquid environmental experiments, the novel structure with micro PnCs shows even better character than the traditional one. Moreover, the introduced microstructure can be extended to microreaction tanks for microcontrol. Therefore, this novel Love wave mode sensor is a promising application for combining acoustic sensors and microfluidics.

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Xu, Xiaofeng, Xiaotao Zu, Dongyi Ao, Jingxia Yu, Xia Xiang, Wanfeng Xie, Yongliang Tang, Sean Li y Yongqing Fu. "NH3-Sensing Mechanism Using Surface Acoustic Wave Sensor with AlO(OH) Film". Nanomaterials 9, n.º 12 (4 de diciembre de 2019): 1732. http://dx.doi.org/10.3390/nano9121732.

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In this study, AlO(OH) (boehmite) film was deposited onto a surface acoustic wave (SAW) resonator using a combined sol-gel and spin-coating technology, and prepared and used as a sensitive layer for a high-performance ammonia sensor. The prepared AlO(OH) film has a mesoporous structure and a good affinity to NH3 (ammonia gas) molecules, and thus can selectively adsorb and react with NH3. When exposed to ammonia gases, the SAW sensor shows an initial positive response of the frequency shift, and then a slight decrease of the frequency responses. The sensing mechanism of the NH3 sensor is based on the competition between mass-loading and elastic-loading effects. The sensor operated at room temperature shows a positive response of 1540 Hz to 10 ppm NH3, with excellent sensitivity, selectivity and stability.

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48

Kim, Jinuk, Eunhyun Kim, Jihyun Kim, Joo-Hyung Kim, Seonggyun Ha, Changsik Song, Won Jun Jang y Jaesook Yun. "Four-Channel Monitoring System with Surface Acoustic Wave Sensors for Detection of Chemical Warfare Agents". Journal of Nanoscience and Nanotechnology 20, n.º 11 (1 de noviembre de 2020): 7151–57. http://dx.doi.org/10.1166/jnn.2020.18851.

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Recently, efforts have been made to adapt surface acoustic waves (SAWs) for use in chemical sensors for detection of chemical warfare agents (CWAs). In this study, a four-channel real-time CWA detection system was constructed using four 250-MHz SAW sensors. Each system consists of three different chemical sensors and one reference sensor. The reference sensor compensates for frequency variations according to humidity and temperature conditions. Signals from the SAW sensors can be checked on a PC-based graphical user interface without additional measuring equipment. To measure dimethyl methylphosphonate (DMMP), a simulant of sarin gas, polyhedral oligomeric silsesquioxane (POSS) and thiourea (TU)-based synthetic polymers were used as sensing materials. The reference sensor was not coated, whereas the three different chemical sensors were coated with POSS, TU-1, and TU-2. The maximum frequencies of POSS, TU-1, and TU-2 were shifted 15.86, 13.85, and 0.944 kHz, showing significant values. We also found a relatively good linear relation between the frequency shift and the concentration of DMMP. The three sensing materials selected-POSS, TU-1, and TU-2-responded significantly to DMMP and triethylphosphate in the selectivity tests. This response is due to the chemical bonding of the sensing materials with the phosphonate in the nerve-agent simulants. These results indicate that the four-channel SAW monitoring system described in this paper shows potential as a portable real-time monitoring system to detect a variety of toxic vapors simultaneously, without using complex measuring equipment. In addition, this approach has demonstrated potential for developing excellent portable sensors to detect different types of CWAs.

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Viespe, Cristian y Dana Miu. "Characteristics of Surface Acoustic Wave Sensors with Nanoparticles Embedded in Polymer Sensitive Layers for VOC Detection". Sensors 18, n.º 7 (23 de julio de 2018): 2401. http://dx.doi.org/10.3390/s18072401.

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Surface Acoustic Wave (SAW) sensors with several types of polymer sensing films, containing embedded Fe3O4 nanoparticles (NPs) with various dimensions and concentrations, were studied. A sensor with a sensing film consisting of the polymer alone was used for comparison. NPs with a mean diameter of 7 nm were produced by laser ablation with 5 ns pulse durations, and NPs with 13 nm diameters were obtained with a laser having 10 ps pulse durations. The properties of the Surface Acoustic Wave sensors with such sensing films were analyzed. Their response (frequency shift, sensitivity, noise and response time) to three different volatile organic components (VOCs) at various concentrations were compared with one another. The frequency shift and sensitivity increased with increasing NP concentration in the polymer for a given NP dimension and with decreasing NP diameter for a given concentration. The best results were obtained for the smallest NPs used. The SAW sensor containing 7 nm NPs had a limit of detection (LOD) of 65 ppm (almost five times better than the sensor with polymer alone), and a response time of about 9 s for ethanol.

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Hikita, Mitsutaka, Keiya Minami, Koki Takimoto y Yasushi Hiraizumi. "Investigation of Novel Surface Acoustic Wave (SAW) Gas Sensor Used in Sensor Network". PIERS Online 4, n.º 3 (2008): 346–50. http://dx.doi.org/10.2529/piers070827030221.

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