Journal articles: 'Laser Line Detection'

1

Matsushita, Akihiko, Takafumi Morishita, Shun’ichi Kaneko, Hitoshi Ohfuji, and Kaoru Fukuda. "Image Detection of Seam Line for Laser Welding Robot." Journal of Robotics and Mechatronics 23, no. 6 (December 20, 2011): 919–25. http://dx.doi.org/10.20965/jrm.2011.p0919.

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Automating robot laser welding requires that laser irradiation direction and laser focus positioning influencing welding strength be controlled precisely along the seam line. Since the edge of the welded object can be transformed in processing by such as cutting, bending and grinding, direct measurement is necessary to detect the seam line. A robust image detection method of seam lines is proposed for hand-eye laser welding system equipped with an optical microscope, a CMOS camera and two slit lasers for measurement. The seam line is detected indirectly to utilize the difference between local and global distribution of image of measurement lasers. Results of experiments demonstrated the effectiveness of our proposal.

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Sun, Shangqu, Liping Li, Jing Wang, Shuguang Song, Peng He, and Zhongdong Fang. "Reconstruction and Measurement of Irregular Karst Caves Using BLST along the Shield Metro Line." Applied Sciences 10, no. 1 (January 4, 2020): 392. http://dx.doi.org/10.3390/app10010392.

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This study investigated the application of the borehole laser scanning technology (BLST) method in the detection of both dry and water-filled karst caves. In order to solve the problem of excessive laser attenuation during the detection, we designed a test for the characteristics of multiwavelength laser attenuation in water-filled karst caves and studied the influence exerted by various factors, including different wavelengths, different laser power levels, different suspended media, and effect of turbidity on the attenuation coefficient. During the test, we discovered the existence of a “blue-green window” with low turbidity and a “near infrared window” with high turbidity in karst cave water environments. Based on the general survey results of drilling and comprehensive geophysical prospecting, a quantitative method using targeted drilling was proposed to detect the spatial morphology of karst caves in complex environments. We also investigated the effects of complex environmental factors such as suspended media and high turbidity on the laser detection distance and accuracy in karst caves, and established a quantitative matching model of laser wavelengths, laser power, and complex environmental parameters. Based on this, we obtained the best acquisition mode for detecting lasers in different karst development environments. A high-precision, three-dimensional visualized model of a real karst cave was established to quantitatively obtain the characteristic parameters, such as accurate position, three-dimensional shape, space volume, and cave filling type, which was applied to the detection of karst caves along the Jinan subway line.

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Gao, Yan Wei, Yu Jun Zhang, Dong Chen, Ying He, Kun You, Yi Zhou, Jian Guo Liu, and Wen Qing Liu. "Oxygen Sensor Based on Tunable Diode Laser Absorption Spectroscopy with a Vertical Cavity Surface-Emitting Laser." Advanced Materials Research 760-762 (September 2013): 40–44. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.40.

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Oxygen plays a fundamental role in nature and industrial process, the fast on-line oxygen concentration detection is of great significance. Tunable diode laser absorption spectroscopy (TDLAS) is capable high selective, high sensitive, non-intrusive, this technique exploits the diode laser tunable and narrow bandwidth characteristics, by selecting one absorption line of the target gas to avoid interference from other gas and realize oxygen concentration fast on-line detection. In this paper, we use vertical cavity surface-emitting laser (VCSEL) as the light source, adopting the wavelength modulation spectroscopy and the harmonic detection technology to measure the second harmonic signal and realize oxygen concentration fast on-line detection. The detection concentration range between 0.1% to 40% and detection accuracy is 0.1%.

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Huang, Wen Zhu, Wen Tao Zhang, Huai Xiang Ma, Fang Li, and Yan Liang Du. "Distributed Feedback Fiber Laser Rosette for Acoustic Emission Detection." Applied Mechanics and Materials 330 (June 2013): 412–17. http://dx.doi.org/10.4028/www.scientific.net/amm.330.412.

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This study aims at providing a practical method in large structure health monitoring. A novel fiber optic rosette based on distributed feedback (DFB) fiber laser for acoustic emission (AE) detection and location is presented. The ultra-narrow line width of the DFB fiber laser will result in high resolution in AE wave detection using a fiber optic interferometric demodulation method. The directivity of the fiber optic rosette is investigated. A rosette with three DFB fiber lasers is tested in the experiment to determine the direction of propagation of AE waves.

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Fernández, Carlos, Vidal Moreno, Belen Curto, and J. Andres Vicente. "Clustering and line detection in laser range measurements." Robotics and Autonomous Systems 58, no. 5 (May 2010): 720–26. http://dx.doi.org/10.1016/j.robot.2009.10.008.

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Wang, Xia, Dai Di Hu, and Xiao Li Wang. "Application of Optical Fiber Laser Sensing Technology in Signal Detection." Advanced Materials Research 1078 (December 2014): 246–49. http://dx.doi.org/10.4028/www.scientific.net/amr.1078.246.

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Signal of ultra high sensitive detection has important application value in the fields of electrical engineering. In recent years there has been a distributed feedback (DFB) fiber laser is a new generation of optical fiber sensing elements of the sensor. It has small size, spectral line width output laser signal is very narrow and low noise advantages, the detection sensitivity can reach high combined with high resolution wavelength demodulation technology. This paper introduces the fiber laser sensor technology and its progress in research and application of technology of detecting signal.

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Xiang, Chengzhi, Xin Ma, Ge Han, Ailin Liang, and Wei Gong. "ON-LINE WAVELENGTH CALIBRATION OF PULSED LASER FOR CO₂ DIFFERENTIAL ABSORPTION LIDAR." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 2, 2016): 141–46. http://dx.doi.org/10.5194/isprs-archives-xli-b1-141-2016.

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Differential absorption lidar (DIAL) remote sensing is a promising technology for atmospheric CO2 detection. However, stringent wavelength accuracy and stability are required in DIAL system. Accurate on-line wavelength calibration is a crucial procedure for retrieving atmospheric CO2 concentration using the DIAL, particularly when pulsed lasers are adopted in the system. Large fluctuations in the intensities of a pulsed laser pose a great challenge for accurate on-line wavelength calibration. In this paper, a wavelength calibration strategy based on multi-wavelength scanning (MWS) was proposed for accurate on-line wavelength calibration of a pulsed laser for CO2 detection. The MWS conducted segmented sampling across the CO2 absorption line with appropriate number of points and range of widths by using a tunable laser. Complete absorption line of CO2 can be obtained through a curve fitting. Then, the on-line wavelength can be easily found at the peak of the absorption line. Furthermore, another algorithm called the energy matching was introduced in the MWS to eliminate the backlash error of tunable lasers during the process of on-line wavelength calibration. Finally, a series of tests was conducted to elevate the calibration precision of MWS. Analysis of tests demonstrated that the MWS proposed in this paper could calibrate the on-line wavelength of pulsed laser accurately and steadily.

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8

Wisha, Narindra heronita. "Design of an Object Height Detection Model under the Line of Sight (LoS) Communication Line using a Laser Distance Meter." Jurnal Jartel: Jurnal Jaringan Telekomunikasi 8, no. 1 (March 1, 2019): 1–6. http://dx.doi.org/10.33795/jartel.v8i1.146.

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The world of telecommunications is growing rapidly so that cellular operator providers are trying to upgrade their networks to meet the needs of their customers with good quality. One effort that can be done is to build a new Base Transceiver Station (BTS). The aim of this research is to create a detection tool capable of detecting objects at a certain height below the line of sight (LoS) line of communication using the laser technology that has been developed. Topographic surveys and building planning are very important and required before building a BTS with an LOS. In this study, the Laser distance meter (rangefinder model) can measure the farthest distance up to 135 meters due to the limited area used. Experiments were applied to several objects to test the ability of the laser used and obtained the maximum distance of the TS832 transmission media reaching 70.7 meters.

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9

Xu, Yongfeng. "Photogrammetry-based structural damage detection by tracking a visible laser line." Structural Health Monitoring 19, no. 1 (April 26, 2019): 322–36. http://dx.doi.org/10.1177/1475921719840354.

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Research works on photogrammetry have received tremendous attention in the past few decades. One advantage of photogrammetry is that it can measure displacement and deformation of a structure in a fully non-contact, full-field manner. As a non-destructive evaluation method, photogrammetry can be used to detect structural damage by identifying local anomalies in measured deformation of a structure. Numerous methods have been proposed to measure deformations by tracking exterior features of structures, assuming that the features can be consistently identified and tracked on sequences of digital images captured by cameras. Such feature-tracking methods can fail if the features do not exist on captured images. One feasible solution to the potential failure is to artificially add exterior features to structures. However, painting and mounting such features can introduce unwanted permanent surficial modifications, mass loads, and stiffness changes to structures. In this article, a photogrammetry-based structural damage detection method is developed, where a visible laser line is projected to a surface of a structure, serving as an exterior feature to be tracked; the projected laser line is massless and its existence is temporary. A laser-line-tracking technique is proposed to track the projected laser line on captured digital images. Modal parameters of a target line corresponding to the projected laser line can be estimated by conducting experimental modal analysis. By identifying anomalies in curvature mode shapes of the target line and mapping the anomalies to the projected laser line, structural damage can be detected with identified positions and sizes. An experimental investigation of the damage detection method was conducted on a damaged beam. Modal parameters of a target line corresponding to a projected laser line were estimated, which compared well with those from a finite element model of the damaged beam. Experimental damage detection results were validated by numerical ones from the finite element model.

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10

Shi Jun, 施军, 肖沙里 Xiao Shali, 徐道连 Xu Daolian, 钱家渝 Qian Jiayu, and 王洪建 Wang Hongjian. "X-Ray Line Polarization Detection for Laser-Produced Plasmas." Acta Optica Sinica 31, s1 (2011): s100401. http://dx.doi.org/10.3788/aos201131.s100401.

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11

Lin, Tzung-Han, Chi-Yun Yang, and Wen-Pin Shih. "Fall Prevention Shoes Using Camera-Based Line-Laser Obstacle Detection System." Journal of Healthcare Engineering 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/8264071.

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Fall prevention is an important issue particularly for the elderly. This paper proposes a camera-based line-laser obstacle detection system to prevent falls in the indoor environment. When obstacles are detected, the system will emit alarm messages to catch the attention of the user. Because the elderly spend a lot of their time at home, the proposed line-laser obstacle detection system is designed mainly for indoor applications. Our obstacle detection system casts a laser line, which passes through a horizontal plane and has a specific height to the ground. A camera, whose optical axis has a specific inclined angle to the plane, will observe the laser pattern to obtain the potential obstacles. Based on this configuration, the distance between the obstacles and the system can be further determined by a perspective transformation called homography. After conducting the experiments, critical parameters of the algorithms can be determined, and the detected obstacles can be classified into different levels of danger, causing the system to send different alarm messages.

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12

Xiang, Chengzhi, Xin Ma, Ge Han, Ailin Liang, and Wei Gong. "ON-LINE WAVELENGTH CALIBRATION OF PULSED LASER FOR CO2 DIFFERENTIAL ABSORPTION LIDAR." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 2, 2016): 141–46. http://dx.doi.org/10.5194/isprsarchives-xli-b1-141-2016.

Full text

Abstract:

Differential absorption lidar (DIAL) remote sensing is a promising technology for atmospheric CO2 detection. However, stringent wavelength accuracy and stability are required in DIAL system. Accurate on-line wavelength calibration is a crucial procedure for retrieving atmospheric CO2 concentration using the DIAL, particularly when pulsed lasers are adopted in the system. Large fluctuations in the intensities of a pulsed laser pose a great challenge for accurate on-line wavelength calibration. In this paper, a wavelength calibration strategy based on multi-wavelength scanning (MWS) was proposed for accurate on-line wavelength calibration of a pulsed laser for CO2 detection. The MWS conducted segmented sampling across the CO2 absorption line with appropriate number of points and range of widths by using a tunable laser. Complete absorption line of CO2 can be obtained through a curve fitting. Then, the on-line wavelength can be easily found at the peak of the absorption line. Furthermore, another algorithm called the energy matching was introduced in the MWS to eliminate the backlash error of tunable lasers during the process of on-line wavelength calibration. Finally, a series of tests was conducted to elevate the calibration precision of MWS. Analysis of tests demonstrated that the MWS proposed in this paper could calibrate the on-line wavelength of pulsed laser accurately and steadily.

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13

Matsushita, Akihiko, Masahiro Yamanaka, Shun'ichi Kaneko, Hitoshi Ohfuji, and Kaoru Fukuda. "Basic Image Measurement for Laser Welding Robot Motion Control." International Journal of Automation Technology 3, no. 2 (March 5, 2009): 136–43. http://dx.doi.org/10.20965/ijat.2009.p0136.

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Laser welding, provides high-density energy, is easy to control, and is low in heat input but deep in depth, enabling it to be used for small-area precision welding. However, Automating welding using robots has been considered, but laser welding requires accurate alignment and direction of irradiation because of its capability of sensitive welding. In this paper, basic image measurement method is proposed for Hand-Eye Laser Welding System equipped with an optical microscope and a CMOS camera, as follows. 1) A core line detection method of a slit laser image that has robustness against variation of observation direction and speckle patterns is proposed. 2) The parameter identification method of laser planes utilizing the core line detection method is proposed for measurement. 3) It is derived measurement equations of the position and the posture of the metal plate from geometric consideration utilizing the identified parameters and the core line detection.

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14

Li, Bin, Qi-Xin He, Hui-Fang Liu, and Yi-Ding Wang. "Integrated Wavelength-Tunable Light Source for Optical Gas Sensing Systems." International Journal of Optics 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/719234.

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A compact instrument consisting of a distributed feedback laser (DFB) at 1.65 μm was developed as a light source for gas sensing systems using tunable diode laser absorption spectroscopy (TDLAS) technique. The wavelength of laser is tuned by adjusting the laser working temperature and injection current, which are performed by self-developed temperature controller and current modulator respectively. Stability test shows the fluctuation of the laser temperature is within the range of ±0.02°C. For gas detection experiments, the wavelength is tuned around the gas absorption line by adjusting laser temperature and is then shifted periodically to scan across the absorption line by the laser current modulator, which generates a 10 Hz saw wave signal. In addition, the current modulator is able to generate sine wave signal for gas sensing systems using wavelength modulation spectroscopy (WMS) technique involving extraction of harmonic signals. The spectrum test proves good stability that the spectrum was measured 6 times every 10 minutes at the constant temperature and current condition. This standalone instrument can be applied as a light source for detection systems of different gases by integrating lasers at corresponding wavelength.

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15

Guo, Yuan, Lian Suo Wei, and Xue Feng Dai. "Designing of a CCD Sensor for On-Line Non-Touch Monitoring Roller Wear." Key Engineering Materials 474-476 (April 2011): 1893–96. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.1893.

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Basing on the principle of laser-linear array CCD detective technology, a high accuracy non-touch on-line optical fibre CCD sensor for monitoring roller wear is brought forward. The principle and composition of the laser-linear array CCD detecting system and the operation process were expatiated. Aiming at the axes shifting of the roller during the detecting process, compensative steps were adopted from the vertical and the parallel detecting surface. And it enhanced the accuracy of the detecting system effectively. Experiments proved that the accuracy of the system could reach to the demand of practical production process. It provides a new method for the high speed, accurate and automatic on line detection of the roller wear.

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Fan, Hui Jie, Li Po Zhao, Si Yuan He, and Yan Dong Tang. "A New Open Curve Detection Algorithm for Extracting the Laser Lines on the Road." Advanced Engineering Forum 2-3 (December 2011): 205–10. http://dx.doi.org/10.4028/www.scientific.net/aef.2-3.205.

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This paper proposes a new open curve detection algorithm for recognizing the laser rays on the road to verify the roughness of the road surface by parsing the curvature of the laser rays. The laser line in the image is first enhanced by the bright line enhance filtering to remove the clutters generated by the background. The enhanced line has the characteristics that its gray value is greater than that of background, so the established energy functional in open curve detection process has a gray value constraint to drive the evolution curve to the brightest place in image. The line on the road surface is an open curve throughout the whole image, so we fixed the two endpoints of the evolution curve to maintain it is an open curve in curve evolution. Moreover, we design an edge inhibit operator to restrain the influence of objects edges to ensure the accuracy of the test laser line. We compared our algorithm with the edge detection operators, and the comparison results showed that our method is more accurate and more robustness to the background.

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Tang, Jingyi, Xiaoqun Tan, Xi Li, Binbin Wei, Zhanxi Wang, and Chen Zheng. "Research on Edge Detection Algorithm Based on Line Laser Scanning." Procedia CIRP 84 (2019): 1101–6. http://dx.doi.org/10.1016/j.procir.2019.04.264.

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Brown, R. C., and A. R. Dona. "On-Line Determination of Unburned Carbon in Airborne Fly Ash." Journal of Engineering for Gas Turbines and Power 112, no. 4 (October 1, 1990): 597–601. http://dx.doi.org/10.1115/1.2906211.

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Knowledge of the carbon content of fly ash is important for calculating combustion efficiency in coal-fired boilers. However, present methods of measuring carbon content of fly ash are tedious and time consuming. Thus, we are investigating photoacoustic absorption spectroscopy (PAS) as a method for on-line monitoring of carbon in fly ash. Photoacustic absorption spectroscopy is capable of detecting very weak absorptions and is unaffected by light scattering in a particulate-laden gas flow. Accordingly, PAS has good potential for distinguishing small amounts of carbon from mineral matter suspended in flue gas. Experiments have been performed on fly ash samples of variable carbon content suspended in a gas flow. A 35-mW HeNe laser was able to detect carbon loadings of 0.75 g/m3. Order-of-magnitude improvements in detection sensitivity are expected with higher power lasers or improved PAS cell design.

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Xu, Baojian, Mo Yang, Hua Wang, Honglian Zhang, Qinghui Jin, Jianlong Zhao, and Huimin Wang. "Line laser beam based laser-induced fluorescence detection system for microfluidic chip electrophoresis analysis." Sensors and Actuators A: Physical 152, no. 2 (June 2009): 168–75. http://dx.doi.org/10.1016/j.sna.2009.04.005.

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20

Tang, Wei, Li Qiu Wang, Hong Zhou Yu, and Xiang Ping Liu. "The Method Study of Laser Alignment Applied to Complete Zero-Line Detection of Artillery." Applied Mechanics and Materials 713-715 (January 2015): 389–94. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.389.

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Aiming at the relatively complicated methods of zero-line detection of artillery, and the limiting of high requirements for target range measurement or the field of calibrating artillery of combat troops, this paper presents the method that laser alignment is applied to complete zero-line detection of artillery. This paper introduces the basic principles and methods of the method, and conduct theoretical analysis, modeling and calculation and determination of related parameters based on the optical principles of laser. This method can be used to complete zero-line detection of artillery in small venue, and provide convenient conditions for the detection for aiming line of artillery, the method is especially suitable for limiting of the field of calibrating artillery of combat troops, and calibrating artillery before shooting in a relatively harsh climatic conditions.

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Li, Jian, Nan Xu, Jian Wei Li, and Zhi Xin Zhang. "Laser Linewidth Measurements Using Self-Heterodyne Detection with Total-Reflected Delay Line." Advanced Materials Research 571 (September 2012): 467–70. http://dx.doi.org/10.4028/www.scientific.net/amr.571.467.

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As an important parameter in the laser communication system, the narrow linewidth of tunable laser source (TLS) must be measured accurately. Therefore, the linewidth of a TLS was measured with the delayed self-heterodyne detection method in the present work. The total-reflected delay line was used in the measurement system for make full use of 25km single-mode fiber delay line. The measured linewidth of the 1550 TLS is of 127 kHz, in agreement with the nominal value.

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22

Liu, Feng, Zhenwei Su, Xiangcheng He, Chaoyong Zhang, Mouqin Chen, and Li Qiao. "A laser imaging method for machine vision detection of white contaminants in cotton." Textile Research Journal 84, no. 18 (April 15, 2014): 1987–94. http://dx.doi.org/10.1177/0040517514530027.

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The existing machine vision systems cannot efficiently detect white contaminants in cotton under the illumination of visible lights, because their color is the same or very close. To solve the problem, this article proposes an imaging method based on line lasers. Under the illumination of a line laser, the white contaminants and cotton showed the differences in the optical characteristic of their surface. Then, according to the features of the intensity of their reflected lights or the distribution of the fluff around their surfaces in the images, an example algorithm for identification of white contaminants from cotton was suggested. The experimental results indicated that, using our method, the mean successful detection rate of the typical white contaminants in cotton was over 87%.

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23

Yonker, C. R., and S. L. Wallen. "High-Pressure On-Line Photolysis with NMR Detection." Applied Spectroscopy 50, no. 6 (June 1996): 781–84. http://dx.doi.org/10.1366/0003702963905664.

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The investigation of the photoreversible fulgide Aberchrome-540 as a function of pressure and temperature with the use of nuclear magnetic resonance (NMR) detection is described. This technique demonstrates the novel combination of high-pressure NMR and laser photolysis with the use of fiber optics for the conversion of the fulgide on-line in the instrument. Investigation of the photolysis of Aberchrome-540 to 2.0 kbar and 120 °C is reported. Extension of this technique should allow the investigation of photoinitiated reaction kinetics and equilibria as a function of pressure and temperature with simultaneous structure characterization by NMR.

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Zhang, Mengchao, Hao Shi, Yan Yu, and Manshan Zhou. "A Computer Vision Based Conveyor Deviation Detection System." Applied Sciences 10, no. 7 (April 1, 2020): 2402. http://dx.doi.org/10.3390/app10072402.

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The monitoring of conveyor belt deviation based on computer vision is the research topic of this paper. A belt conveyor system equipped with cameras and a laser generator is used as the test apparatus. Two kinds of conveyor condition monitoring algorithms are developed, applied and compared in this paper. Method 1 is to extract the edges of the conveyor belt based on the methods of edge detection and line fitting, and an analysis method is proposed to quickly determine whether the conveyor belt is off course. This method simplifies the information processing process after edge line extraction and realizes the fast and effective state detection of the conveyor belt. A conveyor belt deviation detection system was built in Method 2 with the aid of laser technology and the Labview platform. The result of deviation detection was more accurate and reliable with the addition of the laser line. It is observed that both methods can perform well for belt deviation detection, especially Method 2 that resulted in higher reliability and accuracy with faster processing speed. It provides new ideas for ensuring the safe and efficient operation of the conveyor.

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Wang, Chen Ru, Lu Lu, Xia Wang, Wei Qi Jin, and Yong Zhang. "Target-Free Multi-Axes Parallelism Testing Based on Digital Image." Key Engineering Materials 552 (May 2013): 452–58. http://dx.doi.org/10.4028/www.scientific.net/kem.552.452.

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With the development of science and technology, the application to modern warfare of weapon systems identified with modules of laser ranging, infrared imaging and low-light viewing are more and more frequently nowadays. Their combat accuracy depends much on the parallelism of gun line and laser axis. In consequence, it is of great significance to detect and correct the non-parallelism for improving the aim and combat accuracy. The axis parallelism detection exists in not only the production and assembly, but also the adjustment in the combat clearance or field environment. It is the basic to ensure these multi-axis systems work efficiently, and is an essential link of system installation, use and maintenance. There are laboratory method and field detection method to detect the non-parallelism of gun line and laser axis. Now the laboratory method is more mature. At the same time, as it is difficult to avoid vibrations, temperature differences and harsh environment in the field detection, the axis parallelism detection in field environment is an important research direction. One of commonly used methodsaxis parallelism detection needs complex operation, specific environment, and using target, and could not realize the axis parallelism on-line detection in the fighting or running environment. To solve problems above, a multi-optic axis detecting system using a novel image processing way without target is presented in this paper. By using the method of digital image processing, it can test the non-parallelism of gun line and laser axis accurately, as the standard and correction parameter of the weapon systems axis parallelism. The system has advantages in small size, portable type, high precision, and no target. It is suitable for field detection. This paper introduces the operating principle of the system of axis parallelism detection based on digital Image without target, and focuses on the principle, realization method and experimental results of the parallelism detection of gun axis and the system of axis parallelism detection based on digital image without target. Corresponding author: Xia Wang, Associate Professor, Research interests in terms of photoelectric detection, infrared imaging system etc., TEL: 13811670583; Email: angelniuniu@bit.edu.cn

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Pakhomov, Andrew V., William Nichols, and Jacek Borysow. "Laser-Induced Breakdown Spectroscopy for Detection of Lead in Concrete." Applied Spectroscopy 50, no. 7 (July 1996): 880–84. http://dx.doi.org/10.1366/0003702963905538.

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Time-resolved laser-induced breakdown spectroscopy was applied for quantitative measurement of lead content in concrete at levels down to 10 ppm. The breakdown was formed at the sample surface by a Q-switched ND:YAG laser operating at a 1.06-μm wavelength and a repetition rate of 10 Hz. Contamination levels were inferred from the ratio of the integrated emission line of lead to a known reference line of the matrix. The lead contamination can be determined on an absolute scale down to 10 ppm at an optimum delay time of 3.0 μs. These results were derived from analysis of the temporal evolution of the calibration function within a 0.1- to 19.0-μs time range. The calibration function exhibits no dependence on the incident laser pulse energy, which was varied from 250 to 400 mJ.

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27

Steiner, Vojtěch, Pavel Engst, Zdeněk Zelinger, and Milan Horák. "Laser optoacoustic detection of trace concentration levels of ethylene, vinylchloride, and styrene in the atmosphere." Collection of Czechoslovak Chemical Communications 54, no. 10 (1989): 2667–73. http://dx.doi.org/10.1135/cccc19892667.

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The optoacoustic analyzer with a tunable CO2 laser source employed in the present work permits a selective determination of ethylene in trace concentrations higher than 5 ppb (=detection limit for the 10P(14) emission line of the CO2 laser, ν = 949.5 cm-1) and of vinylchloride higher than 42 ppb (= detection limit for the 10P(22) CO2 laser line, ν= 942.4 cm-1). this method covers for both compounds the concentration range corresponding to the hygienic standard. It can be also used for the determination of styrene vapour with concentrations higher than 1.5 ppm.

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Deming, Drake, David A. Glenar, Hans Ulrich Käufl, and Fred Espenak. "Infrared Helioseismology: Detection of the chromospheric mode." Symposium - International Astronomical Union 123 (1988): 425–28. http://dx.doi.org/10.1017/s0074180900158474.

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We have observed solar oscillations using a new instrumental technique in a relatively unexplored region of the solar spectrum. We obtained a 2-day sequence of line profiles, at 30 second intervals, for a pure rotation line of OH at 11.065 μm, using a laser heterodyne spectrometer to view a 2 arc-sec portion of the quiet Sun at disk center. The continuous opacity of the solar atmosphere increases with wavelength longward of 1.6 μm, so 11 μm lines are formed in the upper photosphere, near h = 250 km. In this region the OH rotational transitions have δJ=1 collisional rates which are two orders of magnitude larger than their radiative rates. Hence the OH lines have source functions which are equal to the Planck function, and the high spectral purity provided by the laser heterodyne technique makes their line profiles especially appropriate for investigating the dynamics of the solar atmosphere. We have recently reported (Deming et al. 1986) that oscillations in this OH line show evidence of a resonance due to a cavity in the solar chromosphere.

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Passig, Johannes, Julian Schade, Ellen Iva Rosewig, Robert Irsig, Thomas Kröger-Badge, Hendryk Czech, Martin Sklorz, et al. "Resonance-enhanced detection of metals in aerosols using single-particle mass spectrometry." Atmospheric Chemistry and Physics 20, no. 12 (June 18, 2020): 7139–52. http://dx.doi.org/10.5194/acp-20-7139-2020.

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Abstract. We describe resonance effects in laser desorption–ionization (LDI) of particles that substantially increase the sensitivity and selectivity to metals in single-particle mass spectrometry (SPMS). Within the proposed scenario, resonant light absorption by ablated metal atoms increases their ionization rate within a single laser pulse. By choosing the appropriate laser wavelength, the key micronutrients Fe, Zn and Mn can be detected on individual aerosol particles with considerably improved efficiency. These ionization enhancements for metals apply to natural dust and anthropogenic aerosols, both important sources of bioavailable metals to marine environments. Transferring the results into applications, we show that the spectrum of our KrF-excimer laser is in resonance with a major absorption line of iron atoms. To estimate the impact of resonant LDI on the metal detection efficiency in SPMS applications, we performed a field experiment on ambient air with two alternately firing excimer lasers of different wavelengths. Herein, resonant LDI with the KrF-excimer laser (248.3 nm) revealed iron signatures for many more particles of the same aerosol ensemble compared to the more common ArF-excimer laser line of 193.3 nm (nonresonant LDI of iron). Many of the particles that showed iron contents upon resonant LDI were mixtures of sea salt and organic carbon. For nonresonant ionization, iron was exclusively detected in particles with a soot contribution. This suggests that resonant LDI allows a more universal and secure metal detection in SPMS. Moreover, our field study indicates relevant atmospheric iron transport by mixed organic particles, a pathway that might be underestimated in SPMS measurements based on nonresonant LDI. Our findings show a way to improve the detection and source attribution capabilities of SPMS for particle-bound metals, a health-relevant aerosol component and an important source of micronutrients to the surface oceans affecting marine primary productivity.

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Ding, Shou Cheng, and Wen Hui Li. "Study on Multi-Track Wireless Communication and Laser Detection Device over the Line." Key Engineering Materials 500 (January 2012): 18–23. http://dx.doi.org/10.4028/www.scientific.net/kem.500.18.

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This paper studied the transmission of the athletics starting signal and the end signal detection over the line in track and field competition. At the starting point, 433MHz wireless transmitter module coded and sent the start signal. In the race finish line, the laser device detected athletes signal over the line. The system used an embedded Microsoft Visual Basic 6.0 serial communication control to achieve a reasonable upper and lower computer hardware and software online. Experiments show that: The combination system of hardware and software control applies wireless communication technology and laser detection devices to avoid interference with normal visible light. It has many advantages of a timing accuracy, fast and accurate arrangement of athletes.

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Teng, G. E., M. Zhou, C. R. Li, H. H. Wu, W. Li, F. R. Meng, C. C. Zhou, and L. Ma. "MINI-UAV LIDAR FOR POWER LINE INSPECTION." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W7 (September 12, 2017): 297–300. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w7-297-2017.

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Light detection and ranging (LIDAR) system based on unmanned aerial vehicles (UAVs) recently are in rapid advancement, meanwhile portable and flexible mini-UAV-borne laser scanners have been a hot research field, especially for the complex terrain survey in the mountains and other areas. This study proposes a power line inspection system solution based on mini-UAV-borne LIDAR system&ndash;AOEagle, developed by Academy of Opto-Electronics, Chinese Academy of Sciences, which mounted on a Multi-rotor unmanned aerial vehicle for complex terrain survey according to real test. Furthermore, the point cloud data was explored to validate its applicability for power line inspection, in terms of corridor and line laser point clouds; deformation detection of power towers, etc. The feasibility and advantages of AOEagle have been demonstrated by the promising results based on the real-measured data in the field of power line inspection.

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Kim, Junhee, Yoon-Soo Shin, and Kyung-Won Min. "Line Laser Image Processing for Automated Crack Detection of Concrete Structures." Journal of the Computational Structural Engineering Institute of Korea 31, no. 3 (June 30, 2018): 147–53. http://dx.doi.org/10.7734/coseik.2018.31.3.147.

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IMAKI, Masaharu, Nobuki KOTAKE, Shumpei KAMEYAMA, Takamitsu MORI, Hideo YOSHINAGA, and Yukinobu IMAMURA. "High Speed Line Scanning Laser Sensor for Vehicle and Tire Detection." Review of Laser Engineering 44, no. 5 (2016): 311. http://dx.doi.org/10.2184/lsj.44.5_311.

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Berkelmans, H. W. A., B. W. M. Moeskops, J. Bominaar, P. T. J. Scheepers, and F. J. M. Harren. "Pharmacokinetics of ethylene in man by on-line laser photoacoustic detection." Toxicology and Applied Pharmacology 190, no. 3 (August 2003): 206–13. http://dx.doi.org/10.1016/s0041-008x(03)00164-9.

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Durai, Mathivanan, Yang-Min Hsu, and Ho Chang. "In-Line Inspection of Pipeline Defects Detection Using Ring-Type Laser." World Journal of Engineering and Technology 09, no. 03 (2021): 589–603. http://dx.doi.org/10.4236/wjet.2021.93041.

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Yuan, Ru Wang, and Xiu Ming Jiang. "Research on On-Line Detection Technology for Yarn Evenness." Advanced Materials Research 301-303 (July 2011): 60–66. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.60.

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This paper compares capacitive and photoelectric method for measuring yarn evenness, and presents a new yarn unevenness on-line measurement system to detecting accurately yarn appearance diameter. By means of researching coefficient of diameter variation and mass variation, the relation model of variation coefficient is established, and the experimental data shows excellent correlation between coefficient of diameter variation and coefficient of mass variation and approximate linear relationship. The laser on-line measurement system of yarn evenness can accurately measure yarn diameter and calculate the coefficient of variation, which is suitable for the production field measurement.

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Bonilla-Manrique, Oscar E., Harald Moser, Pedro Martín-Mateos, Bernhard Lendl, and Marta Ruiz-Llata. "Hydrogen Sulfide Detection in the Midinfrared Using a 3D-Printed Resonant Gas Cell." Journal of Sensors 2019 (March 14, 2019): 1–7. http://dx.doi.org/10.1155/2019/6437431.

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A fast and reliable photoacoustic (PA) sensor for trace gas detection is reported. The sensor is based on a 3D-printed resonant cell in combination with a continuous wave mode-hop-free external cavity quantum cascade laser to rapidly acquire gas absorption data in the midinfrared range. The cell is designed so as to minimize the window PA background at a selected acoustic resonance. The goal is a resonant PA cell capable of detecting the traces of gases using wavelength modulation of the laser source and second harmonic detection. The versatility and enhancement of the limit of detection at sub-ppm levels are investigated by monitoring specific lines of hydrogen sulfide (H2S). The noise-equivalent absorption normalized to laser-beam power and detection bandwidth is 1.07×10-8 W cm-1 Hz-1/2 for H2S targeting the absorption line at 1247.2 cm−1. These properties make the sensor suitable for various practical sensors for water quality applications.

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Zhao, F., G. Lo Curto, L. Pasquini, and G. Zhao. "Study of the HARPS Line Profile Using a Laser Frequency Comb." Proceedings of the International Astronomical Union 8, S293 (August 2012): 407–9. http://dx.doi.org/10.1017/s1743921313013276.

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AbstractHigh precision spectroscopy is one of the most successful methods to detect extra-solar planets. To enable the detection of Earth-like planets in the habitable zone, extremely precise instruments are required. Our lack of knowledge of the instrument line profile, non-linearity and charge transfer efficiency effects in the detector limits the achievable precision of an instrument. We report our studies on the HARPS (High Accuracy Radial- velocity Planet Searcher) line profiles, measured using the unresolved lines of a Laser Frequency Comb (LFC). We show how the line profile changes as a function of position and signal, and estimate the errors made in the line centroid measurement due to the variation of the line profile.

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Yan, Gang, Chen Yin Ni, Yi Fei Shi, Zhong Hua Shen, Jian Lu, and Xiao Wu Ni. "Experimental Study on the Detection of Surface-Breaking Defects on Metal with the Scanning Laser Line Source Technique." Key Engineering Materials 364-366 (December 2007): 1117–22. http://dx.doi.org/10.4028/www.scientific.net/kem.364-366.1117.

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The scanning laser line source (SLLS) technique is a novel laser-based inspection method for the ultrasonic detection of small surface-breaking defects. The SLLS approach is based on monitoring the change in laser generated ultrasound as a laser line source is scanning over a defect. It has provided enhanced signal-to-noise performance compared to the traditional pitch-catch or pulse-echo ultrasonic methods. In this paper, an experimental method is presented to detect surface acoustic waves (SAW) with polyvinylindene fluoride(PVDF) transducer. The ultrasonic signal is converted into electric signal by piezoelectricity of the PVDF, which is attached to a micro-knife edge clamped on a metal device. The SAW are excited by employing a pulsed Nd:YAG laser on aluminum plate with artificial surface-breaking defects. The laser line source is accurately shifted by the motorized translation stage, while the PVDF is located at a fixed position on the specimen. When the laser line source is scanning over the defect, the ultrasonic signals are monitored, meanwhile the characteristic changes in the amplitude and frequency content are observed. Consequently, the position of the defect can be determined by analyzing the obtained signals. The experimental system with high sensitivity provides a detection method of small surface-breaking defects on metal and gives convincing experimental evidence for the interaction mechanism between the SAW and the surface-breaking defects.

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Chinni, Rosemarie C., David A. Cremers, Leon J. Radziemski, Melissa Bostian, and Claudia Navarro-Northrup. "Detection of Uranium Using Laser-Induced Breakdown Spectroscopy." Applied Spectroscopy 63, no. 11 (November 2009): 1238–50. http://dx.doi.org/10.1366/000370209789806867.

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The goal of this work is a detailed study of uranium detection by laser-induced breakdown spectroscopy (LIBS) for application to activities associated with environmental surveillance and detecting weapons of mass destruction (WMD). The study was used to assist development of LIBS instruments for standoff detection of bulk radiological and nuclear materials and these materials distributed as contaminants on surfaces. Uranium spectra were analyzed under a variety of different conditions at room pressure, reduced pressures, and in an argon atmosphere. All spectra displayed a high apparent background due to the high density of uranium lines. Time decay curves of selected uranium lines were monitored and compared to other elements in an attempt to maximize detection capabilities for each species in the complicated uranium spectrum. A survey of the LIBS uranium spectra was conducted and relative emission line strengths were determined over the range of 260 to 800 nm. These spectra provide a guide for selection of the strongest LIBS analytical lines for uranium detection in different spectral regions. A detection limit for uranium in soil of 0.26% w/w was obtained at close range and 0.5% w/w was achieved at a distance of 30 m. Surface detection limits were substrate dependent and ranged from 13 to 150 μg/cm2. Double-pulse experiments (both collinear and orthogonal arrangements) were shown to enhance the uranium signal in some cases. Based on the results of this work, a short critique is given of the applicability of LIBS for the detection of uranium residues on surfaces for environmental monitoring and WMD surveillance.

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Thompson, Michelle A., John C. Ford, and George R. Long. "On-Line Detection in Slab Gel Electrophoresis Using Thermal Lens Spectrophotometry." Applied Spectroscopy 46, no. 6 (June 1992): 945–47. http://dx.doi.org/10.1366/0003702924124556.

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Thermal lens spectrophotometry was used to detect hemoglobin and cytochrome c within an acrylamide gel matrix both during electrophoresis and in static experiments in which each protein was incorporated in the matrix during polymerization. For cytochrome c, the detection limit was 0.02 mg/mL for static experiments (approximately 0.5 ng in the laser beam volume), while a detection limit of 180 ng (5 ng in the beam volume) was found for electrophoresis runs.

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Ball, A. J., V. Hohreiter, and D. W. Hahn. "Hydrogen Leak Detection Using Laser-Induced Breakdown Spectroscopy." Applied Spectroscopy 59, no. 3 (March 2005): 348–53. http://dx.doi.org/10.1366/0003702053585282.

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Laser-induced breakdown spectroscopy (LIBS) is investigated as a technique for real-time monitoring of hydrogen gas. Two methodologies were examined: The use of a 100 mJ laser pulse to create a laser-induced breakdown directly in a sample gas stream, and the use of a 55 mJ laser pulse to create a laser-induced plasma on a solid substrate surface, with the expanding plasma sampling the gas stream. Various metals were analyzed as candidate substrate surfaces, including aluminum, copper, molybdenum, stainless steel, titanium, and tungsten. Stainless steel was selected, and a detailed analysis of hydrogen detection in binary mixtures of nitrogen and hydrogen at atmospheric pressure was performed. Both the gaseous plasma and the plasma initiated on the stainless steel surface generated comparable hydrogen emission signals, using the 656.28 Hα emission line, and exhibited excellent signal linearity. The limit of detection is about 20 ppm (mass) as determined for both methodologies, with the solid-initiated plasma yielding a slightly better value. Overall, LIBS is concluded to be a viable candidate for hydrogen sensing, offering a combination of high sensitivity with a technique that is well suited to implementation in field environments.

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Yao, Jin Jie, Jing Yang, Li Ming Wang, Yan Han, and Pei Rui Bai. "Research on Geometric Dimensioning Automatic Detection of Tubular Member." Advanced Materials Research 655-657 (January 2013): 886–89. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.886.

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Geometric dimensioning measurement is a very important application in metrology. In this paper, we focus on the geometric dimensioning automatic detection of tubular member based on the laser displacement sensor. An automatic detection system of tubular member is designed using line laser scanning principle. The system includes base, swivel table, servo motor, motor driver, servo pack, motor controller, laser displacement sensor, data acquisition card, and computer. The system first gathers the displacement information by laser displacement sensor, then performs coordinate transformation and three dimension reconstruction of the tubular member. The external diameter and the roundness error can also be measured. The experimental results show that the geometric dimensioning parameters measurement is effective and accurate using this method.

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Tewey, Kevin, Alan M. Lefcourt, Uri Tasch, Patrick Shilts, and Moon S. Kim. "Hyperspectral, Time-Resolved, Fluorescence Imaging System for Large Sample Sizes: Part II. Detection of Fecal Contamination on Spinach Leaves." Transactions of the ASABE 61, no. 2 (2018): 391–98. http://dx.doi.org/10.13031/trans.11571.

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Abstract. To reduce the risk of foodborne illnesses resulting from fecal contamination in produce fields, a hyperspectral, line-scan, laser-induced fluorescence imaging system was developed with the goal of eventually incorporating the imaging system into a pre-harvest detection apparatus for fecal contamination. The imaging system includes an intensified, gated camera, a spectral adapter, a 355 nm pulsed laser, and laser expansion optics that produce a line-illumination profile. To validate and test the system, spinach leaves inoculated with dilutions of bovine fecal material were imaged repeatedly using a predefined set of imaging parameters. These images were used to evaluate methods for detecting fecal contamination. Methods investigated included ratio, edge, threshold, and slope detection. Differences in the magnitude of averaged intensities for the spectral range of 450-500 nm for regions within fecal contamination sites and in nearby uncontaminated surface areas suggested that the 450-500 nm waveband would be a good region for use in detection tests. Validation tests that used threshold or slope detection, the 450-500 nm waveband, and that took advantage of the slower fluorescence decay rates of fecal contamination sites relative to uncontaminated surface areas showed almost 100% detection of 1:2, 1:10, and 1:100 dilution sites and over 70% detection of 1:200 dilution sites with essentially zero false positives. These results suggest that the imaging system has potential for development of a commercially viable apparatus for pre-harvest detection of fecal contamination in produce fields and for detection of fecal contamination of leafy green vegetables in general. Keywords: Fecal detection, Fluorescence imaging, Food safety, Machine vision, Spinach, Time-resolved imaging.

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Lee, Dong-Hyuk, Hyungpil Moon, and Hyouk Ryeol Choi. "Landmark detection methods for in-pipe robot traveling in urban gas pipelines." Robotica 34, no. 3 (July 9, 2014): 601–18. http://dx.doi.org/10.1017/s0263574714001726.

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SUMMARYElbows and branches in pipelines produce unique image patterns, which can be used as landmarks for autonomous navigation inside the pipelines. This paper presents two landmark detection methods, known as shadow-based method and laser projection method. The first method uses the landmark's unique patterns of shadow produced by the robot's illuminator. The other method exploits special line features generated by its own line-laser beam projector. The basic algorithms for extracting the landmarks are given and special sensor mechanisms are addressed respectively. Finally, the detection performances of each method are validated in various pipeline conditions by using an in-pipe robot, called MRINSPECT-V.

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Xiaona Wang, 王晓娜, 张亦舒 Yishu Zhang, 侯德鑫 Dexin Hou, and 叶树亮 Shuliang Ye. "Detection of microcrack in inductor based on orthogonal scanning line laser thermography." Infrared and Laser Engineering 49, no. 7 (2020): 20190522. http://dx.doi.org/10.3788/irla.2019-0522.

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Xing, Xiong, Un-Ji Song, and Byung-Jae Choi. "Vision Based Position Detection System of Used Oil Filter using Line Laser." Journal of Korean Institute of Intelligent Systems 20, no. 3 (June 25, 2010): 332–36. http://dx.doi.org/10.5391/jkiis.2010.20.3.332.

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Xiaona Wang, 王晓娜, 张亦舒 Yishu Zhang, 侯德鑫 Dexin Hou, and 叶树亮 Shuliang Ye. "Detection of microcrack in inductor based on orthogonal scanning line laser thermography." Infrared and Laser Engineering 49, no. 7 (2020): 20190522. http://dx.doi.org/10.3788/irla20190522.

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Mei, E., and M. Campion. "Confocal Microscopy Based on Laser Line Scanning Method and CMOS Camera Detection." Microscopy and Microanalysis 18, S2 (July 2012): 156–57. http://dx.doi.org/10.1017/s1431927612002632.

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Cabo, C., S. García Cortés, and C. Ordoñez. "Mobile Laser Scanner data for automatic surface detection based on line arrangement." Automation in Construction 58 (October 2015): 28–37. http://dx.doi.org/10.1016/j.autcon.2015.07.005.

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Journal articles on the topic 'Laser Line Detection'

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