Relevant bibliographies by topics / Optical time domain reflectometry (OTDR)

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Optical time domain reflectometry (OTDR)'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Optical time domain reflectometry (OTDR).'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Optical time domain reflectometry (OTDR)"

1

Rao, Yunjiang, Zinan Wang, Huijuan Wu, Zengling Ran та Bing Han. "Recent Advances in Phase-Sensitive Optical Time Domain Reflectometry (Ф-OTDR)". Photonic Sensors 11, № 1 (2021): 1–30. http://dx.doi.org/10.1007/s13320-021-0619-4.

Full text
Abstract:
AbstractPhase-sensitive optical time domain reflectometry (Ф-OTDR) is an effective way to detect vibrations and acoustic waves with high sensitivity, by interrogating coherent Rayleigh backscattering light in sensing fiber. In particular, fiber-optic distributed acoustic sensing (DAS) based on the Ф-OTDR with phase demodulation has been extensively studied and widely used in intrusion detection, borehole seismic acquisition, structure health monitoring, etc., in recent years, with superior advantages such as long sensing range, fast response speed, wide sensing bandwidth, low operation cost and long service lifetime. Significant advances in research and development (R&D) of Ф-OTDR have been made since 2014. In this review, we present a historical review of Ф-OTDR and then summarize the recent progress of Ф-OTDR in the Fiber Optics Research Center (FORC) at University of Electronic Science and Technology of China (UESTC), which is the first group to carry out R&D of Ф-OTDR and invent ultra-sensitive DAS (uDAS) seismometer in China which is elected as one of the ten most significant technology advances of PetroChina in 2019. It can be seen that the Ф-OTDR/DAS technology is currently under its rapid development stage and would reach its climax in the next 5 years.
APA, Harvard, Vancouver, ISO, and other styles
2

Bao, Xiaoyi, and Yuan Wang. "Recent Advancements in Rayleigh Scattering-Based Distributed Fiber Sensors." Advanced Devices & Instrumentation 2021 (March 11, 2021): 1–17. http://dx.doi.org/10.34133/2021/8696571.

Full text
Abstract:
Recently, Rayleigh scattering-based distributed fiber sensors have been widely used for measurement of static and dynamic phenomena such as temperature change, dynamic strain, and sound waves. In this review paper, several sensing systems including traditional Rayleigh optical time domain reflectometry (OTDR), Φ-OTDR, chirped pulse Φ-OTDR, and optical frequency domain reflectometry (OFDR) are introduced for their working principles and recent progress with different instrumentations for various applications. Beyond the sensing technology and instrumentation, we also discuss new types of fiber sensors, such as ultraweak fiber Bragg gratings and random fiber gratings for distributed sensing and their interrogators. Ultimately, the limitations of Rayleigh-based distributed sensing systems are discussed.
APA, Harvard, Vancouver, ISO, and other styles
3

Muanenda, Yonas. "Recent Advances in Distributed Acoustic Sensing Based on Phase-Sensitive Optical Time Domain Reflectometry." Journal of Sensors 2018 (2018): 1–16. http://dx.doi.org/10.1155/2018/3897873.

Full text
Abstract:
Distributed acoustic sensing (DAS) using coherent Rayleigh backscattering in an optical fiber has become a ubiquitous technique for monitoring multiple dynamic events in real time. It has continued to constitute a steadily increasing share of the fiber-optic sensor market, thanks to its interesting applications in many safety, security, and integrity monitoring systems. In this contribution, an overview of the recent advances of research in DAS based on phase-sensitive optical time domain reflectometry (ϕ-OTDR) is provided. Some advanced techniques used to enhance the performance of ϕ-OTDR sensors for measuring backscattering intensity changes through reduction of measurement noise are presented, in addition to methods used to increase the dynamic measurement capacity of ϕ-OTDR schemes beyond conventional limits set by the sensing distance. Recent ϕ-OTDR configurations which significantly enhance the measurement spatial resolution, including those which decouple it from the probing pulse width, are also discussed. Finally, a review of recent advances in more precise quantitative measurement of an external impact based on frequency shift and phase demodulation methods using simple direct detection ϕ-OTDR schemes is given.
APA, Harvard, Vancouver, ISO, and other styles
4

Zhang, Xuping, Yunyin Zheng, Chi Zhang, et al. "A Fading Tolerant Phase-Sensitive Optical Time Domain Reflectometry Based on Phasing-Locking Structure." Electronics 10, no. 5 (2021): 535. http://dx.doi.org/10.3390/electronics10050535.

Full text
Abstract:
The demand for phase-sensitive optical time domain reflectometry (φ-OTDR), which is capable of reconstructing external disturbance accurately, is increasing. However, φ-OTDR suffers from fading where Rayleigh backscattering traces (RBS) have low amplitude and may be lower than the noise floor. Therefore, signal-to-noise ratio (SNR) is reduced. In conventional coherent φ-OTDR, an acoustic optical modulator (AOM), which consists of an RF driving source and an acousto-optic crystal, is commonly used to generate optical pulses and frequency shifts. Since RF driving and external modulation signals come from an independent oscillation source, every intermediate frequency (IF) trace has a different phase bias. Therefore, it is difficult to average the IF signals directly for noise reduction. In this paper, a coherent φ-OTDR system based on phase-locking structure was proposed. This structure provided a clock homologous carrier signal, a modulation signal and a data acquisition (DAQ) trigger signal. Then, moving average methods were taken on IF signals before phase demodulating to reduce the overall noise floor of the system. This new φ-OTDR is more tolerant to fading, which can provide higher accuracy for vibration reconstruction. The frequency response range of vibration was as low as 1Hz, and a 25dB improvement of SNR was achieved.
APA, Harvard, Vancouver, ISO, and other styles
5

Guo, Lin, Pei Zhang, and Yan Shao. "Use Case and Functional Requirements of Optical Time Domain Reflectometer." Applied Mechanics and Materials 543-547 (March 2014): 3696–99. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.3696.

Full text
Abstract:
As the scalable deployment of PON network and the maturity of next generation PON technologies, optical link fault management should be well considered. OTDR is now under study in the industry. Based on our study and real network operation experience, we give an analysis on use case and functional requirements of OTDR, which could be used as a guide in OTDR development and implementation.
APA, Harvard, Vancouver, ISO, and other styles
6

Hagemann, H. J., J. Ungelenk, and D. U. Wiechert. "Optical time-domain reflectometry (OTDR) of diameter modulations in single mode fibers." Journal of Lightwave Technology 8, no. 11 (1990): 1641–45. http://dx.doi.org/10.1109/50.60559.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Жирнов, А. А., К. В. Степанов, А. О. Чернуцкий та ін. "Влияние дрейфа частоты лазера в фазочувствительной рефлектометрии". Журнал технической физики 127, № 10 (2019): 603. http://dx.doi.org/10.21883/os.2019.10.48364.177-19.

Full text
Abstract:
AbstractThe influence of the laser frequency drift on the operation of phase-sensitive optical time domain reflectometry (φ-OTDR) systems is considered. Theoretical results based on a new numerical φ-OTDR model demonstrating the influence of the laser frequency instability on a signal are reported. This model is verified based on experimental data. It has been used to calculate the signal-to-noise ratio (SNR) of the system for different parameters of the laser source stability. As a result, quantitative requirements for lasers used in φ-OTDR systems are formulated.
APA, Harvard, Vancouver, ISO, and other styles
8

Jin, Xiu Mei, Yu Mei Lv, and Li Feng Du. "Research on a New Detection Technique of FBG Using OTDR." Advanced Materials Research 317-319 (August 2011): 2346–50. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.2346.

Full text
Abstract:
A new technique of using Optical Time Domain Reflectometry (OTDR) to detect the reflected power of FBG sensing array was researched systematically. The theoretical model between the reflected power detected by OTDR and the reflected wavelength of FBG was established by analyzing, and consequently the selection rule of FBG wavelength in OTDR detection system was proposed. Moreover, experiments about multi-combination of FBGs with high reflectivity were carried out. The cause of dummy peak and resonance peak in OTDR test curves were analyzed, and meanwhile the selection basis of FBG reflectivity was also given. Based on time division multiplexing theory, detecting low-reflectivity FBG by OTDR can increase the FBG multiplexing number greatly, which has wide prospect to be applied in FBG array detection.
APA, Harvard, Vancouver, ISO, and other styles
9

Hubbard, Peter G., James Xu, Shenghan Zhang, et al. "Dynamic structural health monitoring of a model wind turbine tower using distributed acoustic sensing (DAS)." Journal of Civil Structural Health Monitoring 11, no. 3 (2021): 833–49. http://dx.doi.org/10.1007/s13349-021-00483-y.

Full text
Abstract:
AbstractMaintenance of wind turbine towers is currently a manual process that requires visual inspection and bolt tightening yearly. This process is costly to energy companies and its necessity is not well-defined. In this study, two Rayleigh-based distributed fiber optic sensing technologies are evaluated and compared for their ability to monitor the dynamic structural behavior of a model wind turbine tower subject to free and forced vibration. They are further tested for their ability to detect structural phenomena associated with loose bolts and material damage within the tower. The two technologies examined are optical frequency domain reflectometry (OFDR) and phase-based optical time domain reflectometry ($$\phi$$ ϕ -OTDR), which is a technology used in distributed acoustic sensing (DAS). OFDR is a tested and proven strain measurement technology commonly used for structural health monitoring but can only make strain measurements over short distances (10 s of meters). OFDR was used to validate the measurements made with $$\phi$$ ϕ -OTDR which can measure over much longer distances (several kilometers). Due to its sensing distance capability, $$\phi$$ ϕ -OTDR is a promising technology for monitoring many wind turbines networked together with a single fiber optic cable. This study presents a first-of-its-kind use of $$\phi$$ ϕ -OTDR for structural health monitoring to demonstrate its capabilities.
APA, Harvard, Vancouver, ISO, and other styles
10

Zinsou, Romain, Xin Liu, Yu Wang, Jianguo Zhang, Yuncai Wang, and Baoquan Jin. "Recent Progress in the Performance Enhancement of Phase-Sensitive OTDR Vibration Sensing Systems." Sensors 19, no. 7 (2019): 1709. http://dx.doi.org/10.3390/s19071709.

Full text
Abstract:
Recently, phase-sensitive Optical Time-Domain Reflectometry (Φ-OTDR)-based vibration sensor systems have gained the interest of many researchers and some efforts have been undertaken to push the performance limitations of Φ-OTDR sensor systems. Thus, progress in different areas of their performance evaluation factors such as improvement of the signal-to-noise ratio (SNR), spatial resolution (SR) in the sub-meter range, enlargement of the sensing range, increased frequency response bandwidth over the conventional limits, phase signal demodulation and chirped-pulse Φ-OTDR for quantitative measurement have been realized. This paper presents an overview of the recent progress in Φ-OTDR-based vibration sensing systems in the different areas mentioned above.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Optical time domain reflectometry (OTDR)"

1

Wojcik, Aleksander Karol. "Signal statistics of phase dependent optical time domain reflectometry." Texas A&M University, 2006. http://hdl.handle.net/1969.1/4873.

Full text
Abstract:
The statistics of the phase dependent optical time-domain reflectometer have been analyzed. The optical fiber is modeled by the use of a discrete set of reflectors positioned randomly along the fiber. The statistics of the reflected light from a traveling pulse are derived. The statistics of the signal are used to calculate the characteristics of shot noise in the photodetector, and the probability that noise of certain intensity will occur. An estimation of the backscattered power is made by calculating the fraction of the backscattered power that is captured in a guiding mode. Upper power limits are calculated by considering nonlinear optical effects. An estimation of noise from thermally excited sound waves, amplified by Brillouin scattering, is derived. This noise considers the parameters of a photodetector, giving a model for the noise in the measurable photocurrent. Two models are used to describe the fading probability of the signal. The first model, based on the Fabry-Perot interferometer with a random phase perturbation in the middle, is used to calculate the probability that the whole signal vanishes for any value of phase perturbation. The second model, by calculating the correlation between two signals, one perturbed and one unperturbed, predicts the fading of the signal of interest. The present work gives the theoretical basis for the phase dependant Optical Time Domain Reflectometry, allowing its optimization and setting the fundamental limitations to the performance of the system.
APA, Harvard, Vancouver, ISO, and other styles
2

Ek, Simon. "Distributed Temperature Sensing Using Phase-Sensitive Optical Time Domain Reflectometry." Thesis, KTH, Tillämpad fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-285902.

Full text
Abstract:
This thesis explores and evaluates the temperature measuring capabilities of a phase-sensitive optical time-domain reflectometer (φ-OTDR), which exploits Rayleigh backscattering in normal single mode optical fibers. The device is constructed and its setup explained, and a protocol for making temperature measurements with it is developed. Performance tests are made and the device is shown to achieve fully distributed temperature measurements on fibers hundreds of meters in length with a spatial resolution of 1 m and a temperature resolution of 0.1 K. In addition, the capabilities of the device to measure normal strain in the measurement fiber are tested using the same approach, albeit with less success. The device is capable of very precise measurements, making it very sensitive to the environmental conditions around the measuring fiber but also susceptible to disturbances. Some discussion is had on how to avoid or deal with these disturbances. Furthermore, the technique is shown to be able to run in conjunction with other φ-OTDR measurement techniques from the same device simultaneously.<br>Det här examensarbetet utforskar och utvärderar förmågorna att mäta temperatur hos en fas-känslig optisk tidsdomän-reflektometer (φ-OTDR), som utnyttjar bakåtriktad Rayleigh-spridning i vanliga optiska singelmodfibrer. Anordningen konstrueras och dess komponentstruktur förklaras, och ett protokoll tas fram för att utföra mätningar med den. Prestandatester utförs och anordningen visas kapabel att göra fullt distribuerade temperaturmätningar längs hundratals meter långa fibrer, med en rymdsupplösning på 1 m och en temperaturupplösning på 0.1 K. Dessutom testas förmågan att mäta normaltöjning hos testfibern med samma metod, dock med mindre framgång. Anordningen är väldigt känslig för förhållandena i omgivningen runt mätningsfibern, vilket gör den kapabel till mätningar med mycket hög precision, men också mottaglig för störningar. Lite diskussion hålls kring hur dessa störningar kan undvikas eller hanteras. Vidare visas att mätningstekniken kan köras samtidigt som andra φ-OTDR-baserade tekniker från samma anordning.
APA, Harvard, Vancouver, ISO, and other styles
3

Momand, Farid A. "Monitoring Slope Stability Problems Utilizing Electrical and Optical TDR." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289317906.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Cen, Min. "Study on Supervision of Wavelength Division Multiplexing Passive Optical Network systems." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-42362.

Full text
Abstract:
The wavelength-division-multiplexed passive optical network (WDM-PON) offers many advantages such as large bandwidth per user, easy management, high network security and low insertion loss enabling long-reach and/or high split-ratio. However, with the rapid development and growing interest for deployment of WDM-PON, the PON systems are becoming increasingly vulnerable to various failures. Therefore, network supervision becomes extremely important to guarantee an appropriate level of network reliability performance. The aim of PON supervision is to provide automated test and diagnostic capability without compromising the available bandwidth for services. An essential function is to detect any kind of deterioration in the network that can cause suspended services and to remotely localize these faults in order to avoid the high cost arising from troubleshooting. In this thesis, we evaluate several existing WDM PON supervision methods, based on which two simple and cost-effective new solutions are proposed to localize fiber failures in WDM PON systems. In the first solution, a conventional optical time domain reflectometry (OTDR) and a switch unit are employed, while in the second method, a novel architecture based on N×N arrayed waveguide grating (AWG) is proposed. Both methods are able to localize failures in feeder fiber and drop fibers without e.g. using expensive tunable OTDRs. A patent has been filed based on the second solution. The first proposed method is validated by simulations using VPI Transmission Maker. According to the results, this supervision method is able to give accurate measurement of many different types of failures that may happen in a fiber link. Furthermore, VPI is examined in terms of its future applicability in modeling complete PON supervision methods based on OTDR.
APA, Harvard, Vancouver, ISO, and other styles
5

Saunders, Charles T. W. "Optical fibre sensing by time domain reflectometry." Thesis, University of Manchester, 2006. https://www.research.manchester.ac.uk/portal/en/theses/distributed-optical-fibre-sensing(f1857f29-5af2-4e94-97dd-164f3d67f29b).html.

Full text
Abstract:
This thesis considers cost effective optical time domain rcflectometry for distributed fibre sensors, using new developments in light sources, detectors, fibres and computational power, suitable to interrogate distributed fibre sensors from 20m to 10km, within a £5,000 hardware budget. The characteristics of 200μm core diameter polymer clad silica (PCS) fibre and 980μm core diameter PMMA POF (polymethyl methacrylate plastic optical fibre) were theoretically evaluated including damage thresholds, optimum sensitisation (evanescent field attenuation and micro-bending) and launch conditions for optimum performance as a distributed sensor. Rayleigh backscattered signals, forward-propagating power and Fresnel reflections for different fibre types at different distances along the fibre were considered. PCS fibre allows solutes and gases ready access to the core-cladding interface and is preferred for distributed optical fibre sensors (DOFS) of 1000m. 50-125 graded index multimode fibre is preferred as a sensor of mechanical measurands for DOFS 10km long. The higher backscattering coefficient of PMMA POF returns the highest reflected signals for DOFS of up to 30m. Test beds of simulated distributed optical fibre sensors built from single- and multimode silica, hybrid and PCS fibres were assembled for interrogation by visible and NIR wavelengths using mechanical measurands and misaligned splices as point losses, to determine the relationships between launch pulse power, pulse width and backscattered power and the factors determining spatial resolution and dynamic range. Commercial analogue OTDRs (optical time domain reflectometers) and custom-built photon counting OTDRs (ν-OTDRs) were used to probe the fibre sensors. This enabled the design, custom build and evaluation of an OTDR-based DOFS system where the light source may easily be changed for one of a different power or wavelength. The performance of intrinsic or modified fibres in applications of chemical and pH sensing was evaluated: A simulated distributed PMMA POF was demonstrated to sense pH to a resolution of ±1 pH when placed in aqueous solutions of 4.2 x 10⁻⁴ M methyl red between pH 2.89 and 9.70 and probed with 648nm light using a ν-OTDR. An undyed PCS fibre was used to sense aqueous methyl red when probed with 657nm light from a ν-OTDR. An undyed PCS fibre was used to detect 6.5 x 10⁻⁴ M methyl red in ethanol using 657nm light from a ν-OTDR by modifying the cladding refractive index from 1.401 to 1.370. A PCS fibre dyed with 4.4 x 10⁻⁶ M chlorophyll a in ethanol solution then dried was probed by ν-OTDR at 657nm, returning a 4.0dB peak on the trace indicating detection by Fresnel reflection by light in the cladding. A slope of -2.0dB/m on the trace indicated evanescent field absorption due to the 662nm absorption peak. An avalanche photodiode (APD) detection system with inherent stability suitable for long term monitoring of Rayleigh back-scattered signals was designed and built. The modules included an active quench and recharge circuit capable of 20MHz count rate with a novel quenching circuit bias arrangement to provide immunity from spurious triggering, and a Peltier cooler circuit to regulate the APD to ± 0.1°C. A dynamic bias control system based around a PCI-6602 (NI) counter-timer card was designed, built, evaluated and shown by calculation to limit the tolerance on 2.0V excess bias to ± 0.048V. The tighter control of the excess bias stabilises quantum efficiency, resolution and dark count.
APA, Harvard, Vancouver, ISO, and other styles
6

Luo, Linqing. "Time-frequency localisation of distributed Brillouin Optical Time Domain Reflectometry." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274568.

Full text
Abstract:
Distributed fibre optic sensing (DFOS) is essential for structural health monitoring (SHM) of strain changes induced during the lifetime of a structure. Among different DFOS systems, the Brillouin Optical Time Domain Reflectometry (BOTDR) takes the advantages of obtaining full frequency spectrum to provide strain and temperature information along the optic fibre. The key parameters of distributed fibre optic sensors, spatial and frequency resolution, are strongly linked with the time-frequency (T-F) localisation in the system in three parts: pulse, hardware design and optical fibre. T-F localization is fundamentally important for the communication system, whereas in this study the importance of the T-F localisation to the spatial and frequency resolution, repeatability and the measurement speed are introduced in BOTDR. In this dissertation, the development of DFOS is first introduced, including both traditional methods and new developed designs. The literature review shows the signal to noise ratio (SNR) of BOTDR can be improved by investigating its T-F localisation. In the hardware design, in order to improve the T-F localisation in hardware architecture, a Short-Time Fourier Transform-Brillouin Optical Time-Domain Reflectometry (STFT-BOTDR), which implements STFT over the full frequency spectrum to measure the distributed temperature and strain along the optic fibre, is applied so that the conventional frequency sweeping method can be replaced for high resolution and fast speed measurement, providing new research advances in dynamic distributed sensing. The STFT based BOTDR has better T-F localisation, which in turn provides an opportunity for off-line post signal processing that is more adaptable for fast speed measurements. The spatial and frequency resolution of dynamic BOTDR sensing is limited by the Signal to Noise Ratio (SNR) and the T-F localization of the input pulse shape. The T-F localized input pulse shape can enhance the SNR and the spatial and frequency resolution in STFT-BOTDR. In this study, simulation and experiments of T-F localized different pulses shapes are conducted to examine the limitation of the system resolution. The result indicates that a rectangular pulse should be selected to optimize the spatial resolution and a Lorentzian pulse could be chosen to optimize the frequency resolution, while a Gaussian shape pulse can be used in general applications for its balanced performance in both spatial and frequency resolution. Meanwhile, T-F localization is used for pulse T-F localisation optimisation. A set of Kaiser-Bessel functions is used to simulate different pulse shapes and to compare their parameters in terms of T-F localisation and their Brillouin scattering spectrum. A method using an iterative filtering algorithm to achieve the optimised pulse in terms of T-F localisation is introduced to converge the Effective-pulse Width (TEW) in the time-domain and Effective-pulse Linewidth (FEL) in the frequency domain to identify the fundamental limitations. The optimised pulse can be fitted with a 7th order Gaussian (super-Gaussian) shape and it offers the best experimental performance compared to a Rectangular pulse. The sensitivity of a sensor to strain or temperature variations due to distributed Brillouin scattering is closely related to the power distribution on the Brillouin scattering spectrum which is related to the property of the optic fibre. The performance of a highly nonlinear fibre that can generate a higher Brillouin scattering signal is compared to that of a standard single mode fibre. The results show that much higher SNR of the Brillouin scattering spectrum and smaller frequency uncertainties in the sensing measurement can be achieved by using a highly nonlinear fibre for comparable launched powers. With a measurement speed of 4 Hz, the frequency uncertainty can be 0.43 MHz, corresponding to 10 με in strain or 0.43°C in temperature uncertainty for the tested highly nonlinear fibre. In contrast, for a standard single mode fibre, the value would increase to about 1.02 MHz (25 με or 1.02°C), demonstrating the advantage of the tested highly nonlinear fibre for distributed strain/temperature sensing. Results show that, by using a small effective area highly nonlinear fibre, the strain or temperature resolution can be improved because it generates stronger Brillouin scattering signal with high SNR and high Q factor spectrum, both of which determine the optimal averaging time in a single measurement. In general, the STFT-BOTDR can achieve 1 m spatial resolution, 10 με frequency resolution on a 10 km fibre with measurement speed at about 2.5 kHz.
APA, Harvard, Vancouver, ISO, and other styles
7

Jacobson, Carl P. "Temperature corrected strain measurements using optical time domain reflectometry." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41906.

Full text
Abstract:
<p>A method of using optical fiber to measure strain and correct for the effects of temperature is proposed. A means of measuring apparent strain is given, pure temperature is measured using Fresnel-backscatter based Optical Time Domain Reflectametry, and a method for combining the two measurements to obtain a measurement of mechanically-induced strain alone is developed. The background, theory and experimental results that demonstrate the feasibility of such a system are presented and the results are compared with the performance of existing fiber-based means of measuring temperature. Experiments on several OTDR-addressed, intensity-based optical temperature sensors are performed and a method for manufacturing small air gap splices for use in measuring strain at several places along an optical fiber are presented.<br>Master of Science
APA, Harvard, Vancouver, ISO, and other styles
8

Zimmermann, Bernd D. "High resolution optical time domain reflectometry and its applications." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/56195.

Full text
Abstract:
High resolution Optical Time Domain Reflectometry (OTDR) measurements have recently allowed spatial resolutions of less than one millimeter. These capabilities indicate that OTDR techniques may be suitable for non-conventional applications such as the determination of fiber strain. This thesis presents an investigation of how high resolution OTDR techniques can be used in such applications. The concept of fiber segmentation via partially reflective optical splices for local strain measurements is discussed both from a theoretical and practical standpoint. Experimental results demonstrating the feasibility of such local strain measurements are also given. Another part of this investigation considers the practical details of the proposed strain measurement technique, addressing such topics as launching conditions, and environmental factors. Possible applications of the local strain measurement techniques, such as two- and three-dimensional stress analysis, and strain determination of fiber optic cables, are also presented. These applications also include the development of small, easy to manufacture elastomeric optical splices, which were shown to yield acceptable performance < 0.2 dB losses) for multimode fibers.<br>Master of Science
APA, Harvard, Vancouver, ISO, and other styles
9

Ren, Meiqi. "Distributed Optical Fiber Vibration Sensor Based on Phase-Sensitive Optical Time Domain Reflectometry." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34400.

Full text
Abstract:
In this thesis, the work focuses on developing distributed optical fiber vibration sensors based on phase-sensitive optical time domain reflectometry (Φ-OTDR). Three works have been accomplished to improve the performances of Φ-OTDR for distributed vibration sensing. Firstly, Φ-OTDR based on a polarization diversity scheme is demonstrated to mitigate the polarization mismatch effect occurring in traditional systems. A theoretical analysis is performed in different polarization cases corresponding to coherent and polarization diversity detection. Φ-OTDR based polarization diversity shows a great potential in the multi-events sensing application. Two vibration events are simultaneously detected and their signal to noise ratios are improved by 10.9 dB and 8.65 dB, respectively, compared to the results obtained by a conventional coherent scheme. Intensity fluctuation in a phase-sensitive optical-time domain reflectometry (Φ-OTDR) system caused by stochastic characteristics of Rayleigh backscattering has limited relative vibration strength measurement, which is proportional to dynamic strain. A trace-to-trace correlation coefficient is thus proposed to quantify the Φ-OTDR system stability and a novel approach of measuring the dynamic strain induced by various driving voltages of lead zicronate titanate (PZT) is demonstrated. Piezoelectric vibration signals are evaluated through analyzing peak values of the fast Fourier transform spectra at fundamental frequency and high-order harmonics based on Bessel functions. Experimental results show high correlation coefficients and good stability of our Φ-OTDR system, as well as the small measurement uncertainty of measured peak values. To reduce the intra-band noise caused by the finite extinction ratio of optical pulses, Φ-OTDR based on high extinction ratio generation is studied. Two methods are developed for achieving high extinction ratio of optical pulse generation. One of the approaches is to synchronize two cascaded electro-optic modulators to achieve high extinction ratio operation. The other one is to use the nonlinear optical fiber loop mirror as an optical switch to suppress the continuous wave portion of optical pulse. The sensing range of 1.8 km and 8.4 km with corresponding spatial resolution of 0.5 m and 2 m have been demonstrated based on cascaded two electro-optic modulators and nonlinear optical fiber loop mirror setup, respectively.
APA, Harvard, Vancouver, ISO, and other styles
10

Cho, Yuh Tat. "An investigation into using optical amplifiers for enhancing Brillouin based optical time domain reflectometry." Thesis, University of Southampton, 2004. https://eprints.soton.ac.uk/42432/.

Full text
Abstract:
Distributed fibre sensors have been successfully demonstrated and used in various industries for performing continuous measurements of the physical parameters such as temperature and strain. However, the measurement range and the performance of such sensors are limited by the intrinsic attenuation of the signal in the sensing fibre. This thesis investigates using optical amplification within the sensing fibre to enhance the range and the performance of the distributed Brillouin based sensors. To extend the range beyond this, remote amplification was also investigated using CW Raman amplification in which a Raman pump is injected at the midpoint of a 100km sensing fibre and a remotely pumped Erbium doped fibre amplifier is also situated at the midpoint. The performance achieved using each technique was measured and the relative advantages of each configuration were identified and discussed
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Optical time domain reflectometry (OTDR)"

1

Anderson, Duwayne R. Optical time-domain reflectometry. Tektronix, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Anderson, Duwayne R. Troubleshooting optical-fiber networks: Understanding and using your optical time-domain reflectometer. 2nd ed. Elsevier Academic Press, 2004.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Optical time domain reflectometry (OTDR)"

1

Papp, Adam, Christoph Wiesmeyr, Martin Litzenberger, Heinrich Garn, and Walter Kropatsch. "Train Detection and Tracking in Optical Time Domain Reflectometry (OTDR) Signals." In Lecture Notes in Computer Science. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45886-1_26.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Weik, Martin H. "optical time domain reflectometry." In Computer Science and Communications Dictionary. Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_13168.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Knoechel, R., S. Heckmann, J. Rybach, and E. Brinkmeyer. "Optical Time Domain Reflectometry Using the Heterodyne Principle." In Laser/Optoelektronik in der Technik / Laser/Optoelectronics in Engineering. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82638-2_46.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Pradhan, Himansu Shekhar, P. K. Sahu, D. Ghosh, and S. Mahapatra. "Brillouin Distributed Temperature Sensor Using Optical Time Domain Reflectometry Techniques." In Smart Sensors, Measurement and Instrumentation. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42625-9_10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Beaud, P., J. Schütz, W. Hodel, and H. P. Weber. "High Resolution Optical Time Domain Reflectometry for the Characterization of Integrated Optical Devices." In Springer Proceedings in Physics. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75826-3_21.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Agarwal, Abhinav, Tabjula Jagadeeswar, Srijith Kanakambaran, Mohit Shrivastava, and Balaji Srinivasan. "Acoustic Emission-Based Leakage Detection System Using Coherent Optical Time Domain Reflectometry (COTDR)." In Springer Proceedings in Physics. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9259-1_80.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

"Principles of Optical Time-Domain Reflectometry (OTDR) for Distributed Sensing." In An Introduction to Distributed Optical Fibre Sensors. CRC Press, 2017. http://dx.doi.org/10.1201/9781315119014-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Devarajulu, Hemachandar Tanukonda, Deepak Goyal, and Mayue Xie. "Fault Isolation Using Time Domain Reflectometry, Electro Optical Terahertz Pulse Reflectometry and Time Domain Transmissometry." In Microelectronics Failure Analysis. ASM International, 2019. http://dx.doi.org/10.31399/asm.tb.mfadr7.t91110132.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Spirin, Vasily V., Cesar A. López-Mercado, Patrice Mégret, and Andrei A. Fotiadi. "Fiber Laser for Phase-Sensitive Optical Time-Domain Reflectometry." In Selected Topics on Optical Fiber Technologies and Applications. InTech, 2018. http://dx.doi.org/10.5772/intechopen.72553.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

"Distributed strain measurement in steel slab-on-girder bridge via Brillouin optical time domain reflectometry." In Advances in Bridge Maintenance, Safety Management, and Life-Cycle Performance, Set of Book & CD-ROM. CRC Press, 2015. http://dx.doi.org/10.1201/b18175-367.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Optical time domain reflectometry (OTDR)"

1

Lalam, Nageswara R., Ping Lu, Michael P. Buric, and Paul R. Ohodnicki. "Phase-optical time domain reflectometry ([theta]-OTDR) with enhanced performance." In Photonic Instrumentation Engineering VII, edited by Yakov Soskind and Lynda E. Busse. SPIE, 2020. http://dx.doi.org/10.1117/12.2545089.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Jang, Jeonghwan, Sungpil Chang, Namso Cho, and Namsik Kim. "Crack detection of structures using optical time domain reflectometry (OTDR) method." In SPIE's 7th Annual International Symposium on Smart Structures and Materials, edited by S. C. Liu. SPIE, 2000. http://dx.doi.org/10.1117/12.383149.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Shi, Jingbo, Nan Qi, Qianqian Yang, et al. "A low-cost, system-on-chip for Optical Time Domain Reflectometry (OTDR)." In 2016 IEEE MTT-S International Wireless Symposium (IWS). IEEE, 2016. http://dx.doi.org/10.1109/ieee-iws.2016.7585445.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Keeler, Gordon A., Darwin K. Serkland, Kent M. Geib, John F. Klem, and Gregory M. Peake. "In situ optical time-domain reflectometry (OTDR) for VCSEL-based communication systems." In Integrated Optoelectronic Devices 2006, edited by Chun Lei and Kent D. Choquette. SPIE, 2006. http://dx.doi.org/10.1117/12.644176.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Geiger, Harald, John P. Dakin, Nicholas C. Eaton, and P. J. Chivers. "New optical time domain reflectometry (OTDR) technique for monitoring the range of reflective markers." In 10th Optical Fibre Sensors Conference. SPIE, 1994. http://dx.doi.org/10.1117/12.185027.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Feigel, Benjamin, Jürgen Van Erps, Mulham Khoder, et al. "Advanced simulation tool for optical time-domain reflectometry (OTDR) with arbitrary pulse shapes." In SPIE Photonics Europe, edited by Frank Wyrowski, John T. Sheridan, Jani Tervo, and Youri Meuret. SPIE, 2014. http://dx.doi.org/10.1117/12.2051403.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Wu, Huijuan, Xiaoyu Li, Zhengpu Peng та Yunjiang Rao. "A novel intrusion signal processing method for phase-sensitive optical time-domain reflectometry (Φ-OTDR)". У OFS2014 23rd International Conference on Optical Fiber Sensors, редактори José M. López-Higuera, Julian D. C. Jones, Manuel López-Amo та José L. Santos. SPIE, 2014. http://dx.doi.org/10.1117/12.2058503.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Kowalski, Andrezej, S. Kuklinski, and A. Zakrzewski. "Automatic analysis of optical time domain reflectometer (OTDR) measurement results." In Laser Technology: Fourth Symposium, edited by Wieslaw L. Wolinski, Zdzislaw Jankiewicz, Jerzy K. Gajda, and Bohdan K. Wolczak. SPIE, 1995. http://dx.doi.org/10.1117/12.203324.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Lalam, Nageswara R., Ping Lu та Michael P. Buric. "Performance improvement of phase-optical time domain reflectometry (Φ-OTDR) based on wavelength diversity technique". У Fiber Optic Sensors and Applications XVII, редактори Glen A. Sanders, Robert A. Lieberman та Ingrid U. Scheel. SPIE, 2021. http://dx.doi.org/10.1117/12.2588362.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Mendoza, Edgar A., James A. Sorenson, Allen Iossi, Zongjian Sun, Daniel P. Robinson, and Robert A. Lieberman. "Demonstration of self-referenced fiber optic moisture and pH sensors using optical time domain reflectometry (OTDR)." In SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, edited by Robert A. Lieberman. SPIE, 1996. http://dx.doi.org/10.1117/12.260598.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Optical time domain reflectometry (OTDR)"

1

Huntley, D., P. Bobrowsky, Q. Zhang, X. Zhang, and Z. Lv. Fibre Bragg grating and Brillouin optical time domain reflectometry monitoring manual for the Ripley Landslide, near Ashcroft, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/304235.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Optical time domain reflectometry (OTDR)' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography