A distributed fiber vibration sensor utilizing dispersion induced walk-off effect in a unidirectional Mach-Zehnder interferometer

Chen, Qingming; Jin, Chi; Bao, Yuan; Li, Zhaohui; Li, Jianping; Lu, Chao; Yang, Liu; Li, Guifang

doi:10.1364/oe.22.002167

Cited by 38 publications

(10 citation statements)

References 15 publications

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“…For example, the authors in [8] describe dynamic strain measured by Mach-Zehnder interferometric optical fibre sensors and signal demodulation using a 3 × 3 coupler. A distributed fibre vibration sensor utilizing dispersion induced walk-off effect in a unidirectional Mach-Zehnder interferometer was presented by Chen et al [9]. The authors in [10] describe dual parameter fibre optic sensor combining a Fabry-Perot and a Mach-Zehnder interferometer.…”

Section: Distributed Fibre Optic Sensingmentioning

confidence: 99%

Distributed Sensing Based on Interferometry and Polarization Methods for Use in Fibre Infrastructure Protection

Münster

Horváth

Vojtěch

2019

Sensors

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Fibre optic infrastructures are very important, and therefore, it is necessary to protect them from fibre cuts. Most fibre cuts are caused by digging activity, and many network operators seek appropriate solutions enabling detection of possible unexpected events (predict these cuts) and subsequent network outages. In most cases, there is no need to locate events, and only information regarding the occurrence of the event is sufficient. Direct detection-based distributed fibre optic sensing systems appear to be an appropriate solution, allowing digging to be detected before the fibre breaks. The average power of such signals is relatively small, and there is no interference with other signals in the fibre. We performed laboratory measurements to compare the sensitivity and accuracy of interferometric and polarization systems for acoustic vibrations. In the case of interferometric systems, the reference and sensing arms were in the same cable, and both were subjected to acoustic vibrations.

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Section: Distributed Fibre Optic Sensingmentioning

confidence: 99%

Distributed Sensing Based on Interferometry and Polarization Methods for Use in Fibre Infrastructure Protection

Münster

Horváth

Vojtěch

2019

Sensors

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“…The complete citation is used on the first page, and an abbreviated version on subsequent pages. [4] and even Fiber Bragg Gratings (FBGs) [5]. All the described methods exhibit very high detection sensitivity and are able to cover large areas, but, they usually are based on monomode optical fibers.…”

Section: Spiedigitallibraryorgmentioning

confidence: 99%

Common frequency suppression method for fiber specklegram perimeter sensors

2015

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In this work, a frequency based processing scheme has been employed to improve the sensitivity of Fiber Specklegram Sensors (FSSs) applied to perimeter fences. Based on 1.8 km of multimode fiber, two laser sources with different spectral properties have been employed to feed the optical fiber. These two laser sources provoke sensing systems with very different SNRs to which the common frequency suppression method has been applied. The final results suggest enough improvement on SNR to reduce the quality of the laser source on perimeter sensors, also decreasing the final cost.

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“…Many types of fiber-optic acoustic sensors, based on fiber Bragg gratings [1,2], intensity modulation [3], and interferometers, had been reported. Among them, the interferometric sensors, such as Fabry–Pérot interferometers [4,5,6], Mach–Zehnder interferometers [7,8,9], and Sagnac interferometers [10], have achieved high sensitivity and low minimum detectable pressure.…”

Section: Introductionmentioning

confidence: 99%

An Optical MEMS Acoustic Sensor Based on Grating Interferometer

Zhang

Ren

et al. 2019

Sensors

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Acoustic detection is of great significance because of its wide applications. This paper reports a Micro-Electro-Mechanical System (MEMS) acoustic sensor based on grating interferometer. In the MEMS structure, a diaphragm and a micro-grating made up the interference cavity. A short-cavity structure was designed and fabricated to reduce the impact of temperature on the cavity length in order to improve its stability against environment temperature variations. Besides this, through holes were designed in the substrate of the grating to reduce the air damping of the short-cavity structure. A silicon diaphragm with a 16.919 µm deep cavity and 2.4 µm period grating were fabricated by an improved MEMS process. The fabricated sensor chip was packaged on a conditioning circuit with a laser diode and a photodetector for acoustic detection. The output voltage signal in response to an acoustic wave is of high quality. The sensitivity of the acoustic sensor is up to −15.14 dB re 1 V/Pa @ 1 kHz. The output signal of the high-stability acoustic sensor almost unchanged as the environment temperature ranged from 5 °C to 55 °C.

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A distributed fiber vibration sensor utilizing dispersion induced walk-off effect in a unidirectional Mach-Zehnder interferometer

Cited by 38 publications

References 15 publications

Distributed Sensing Based on Interferometry and Polarization Methods for Use in Fibre Infrastructure Protection

Distributed Sensing Based on Interferometry and Polarization Methods for Use in Fibre Infrastructure Protection

Common frequency suppression method for fiber specklegram perimeter sensors

An Optical MEMS Acoustic Sensor Based on Grating Interferometer

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