Distributed fiber-optic vibration sensor using a ring Mach-Zehnder interferometer

Sun, Qizhen; Liu, Deming; Wang, Jian; Liu, Hairong

doi:10.1016/j.optcom.2007.11.055

Cited by 136 publications

(39 citation statements)

References 14 publications

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“…As shown in Fig. 2, the proposed method is based on filtering the components of the photo-detector complex signal to obtain the third and fourth terms of (3); a simple division between these two terms results in a harmonic signal at the probe light modulation frequency and with a phase delay depending on (4) By measuring the phase delay at the modulation frequency one can calculate . The distance to the perturbed interferometer can be found as (5) where is the measured phase delay of the probe signal due to the round trip from the modulator to the perturbed interferometer, is the speed of light and is the effective refractive index of the fiber core.…”

Section: Principle Of Operationmentioning

confidence: 99%

“…For location of non-concurrent perturbations (or a single event), several relatively simple systems have been proposed. Systems are based on different combinations of long-path fiber-optic interferometers such as a Sagnac loop interferometer, a Mach-Zehnder interferometer, double Sagnac interferometers, a ring Mach-Zehnder interferometer [2]- [4]. Two interferometers are usually required in order to compensate for the influence of a disturbance frequency on the calculated position of the disturbance.…”

Section: Introductionmentioning

confidence: 99%

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Vibration Disturbance Localization Using a Serial Array of Identical Low-Finesse Fiber Fabry-Perot Interferometers

et al. 2012

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An optical fiber sensor system for localization of a vibrational disturbance along the fiber is presented. The sensor system is based on a serial array of identical Fabry-Perot interferometers, formed directly in the single mode SMF-28e fiber by pairs of fiber Bragg gratings with reflectivity of 0.04% each. Interferometers were interrogated by an intensity modulated distributed feedback diode laser. We present a signal processing algorithm for localization of a disturbed interferometer and experimental results for a serial array of 14 in-fiber interferometers. Simple sensor configuration and the use of low-frequency components make it potentially inexpensive and suitable for applications where continuous monitoring for appearance of vibrations is required.Index Terms-Fiber Bragg grating, low-finesse Fabry-Perot interferometer, optical fiber sensor.

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Section: Principle Of Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vibration Disturbance Localization Using a Serial Array of Identical Low-Finesse Fiber Fabry-Perot Interferometers

et al. 2012

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“…Optical fiber sensors earn this accolade due to their many advantages such as miniaturization, flexibility, fast response and capability for real time and in-situ sensing deployment as well as capability of remote sensing [3,4]. This increases the desirability of optical fiber sensors as compared to electrical based transducers [5,6], especially when it comes to chemical detection [7,8], humidity [9,10], and also vibration sensing [11,12].…”

Section: Introductionmentioning

confidence: 99%

Increased sensitivity of Au-Pd nanolayer on tapered optical fiber sensor for detecting aqueous Ethanol

Noor

Talah

Rosli

et al. 2017

J. Eur. Opt. Soc.-Rapid Publ.

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Background: Optical fiber sensors gains popularity as an alternative and a better solution compared to its electronics counterpart. Especially in detecting hazardous materials, optical fiber sensors prove to have many advantages such as miniaturization, remote yet real-time sensing and immune to electromagnetics interference. Methods: In this paper, we used a 40um tapered standard multi-mode fiber coated with gold (Au), palladium (Pd) and mixtures of Au-Pd nano-composites to detect hazardous ethanol in its various concentration in aqueous environment. Interrogation were made possible using UV-VIS light source, and changes in absorbance and intensity were recorded via spectrometer. Results and Conclusion: Ethanol ranging from 20% till 100% were investigated. It was found that the composition of nanomaterial coating on the developed sensors strongly affected the sensing performance. From the experiments carried out, the sensor with a gold palladium nanocomposite layer with a 2: 1 ratio of gold to palladium produced the highest sensitivity, which is 0.74/vol% concentration of Ethanol. The fabricated fiber sensor also exhibits fast response and recovery time of 13 s and 6 s respectively.

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“…Up to now, the distributed optical fiber measurements mainly include optical fiber interferometer sensors and optical backscattering based sensors. Interferometer sensors acquire distributed information by integration of the phase modulation signals, and usually two interferometers are used to determine the position, including combining the Sagnac to a Michelson interferometer [1], modified Sagnac/Mach-Zehnder interferometer [2], twin Sagnac [3]/Michelson [4]/Mach-Zehnder [5] interferometers, and adopting a variable loop Sagnac [6]. Another distinguished technique is the use of optical backscattering based sensors.…”

Section: Introductionmentioning

confidence: 99%

Interferometric distributed sensing system with phase optical time-domain reflectometry

et al. 2016

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Abstract:We demonstrate a distributed optical fiber sensing system based on the Michelson interferometer of the phase sensitive optical time domain reflectometer (φ-OTDR) for acoustic measurement. Phase, amplitude, frequency response, and location information can be directly obtained at the same time by using the passive 3×3 coupler demodulation. We also set an experiment and successfully restore the acoustic information. Meanwhile, our system has preliminary realized acoustic-phase sensitivity around 150 dB (re rad/μPa) in the experiment.

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Distributed fiber-optic vibration sensor using a ring Mach-Zehnder interferometer

Cited by 136 publications

References 14 publications

Vibration Disturbance Localization Using a Serial Array of Identical Low-Finesse Fiber Fabry-Perot Interferometers

Vibration Disturbance Localization Using a Serial Array of Identical Low-Finesse Fiber Fabry-Perot Interferometers

Increased sensitivity of Au-Pd nanolayer on tapered optical fiber sensor for detecting aqueous Ethanol

Interferometric distributed sensing system with phase optical time-domain reflectometry

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