Tapered Fiber Attached Nitrile Diaphragm-Based Acoustic Sensor

Dass, Sumit; Jha, Rajan

doi:10.1109/jlt.2017.2776519

Cited by 36 publications

(15 citation statements)

References 44 publications

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“…So far, various configurations of OFVS have been developed. One of the most widely used schemes is the tapered fiber based vibration sensors [1][2][3][4], where either the tapered fiber is used as the sensing arm of the Mach-Zehnder interferometers or the microbending loss of the tapered fiber is utilized to detect vibration. However, the tapered fibers are fragile, which results in poor mechanical strength of the sensor head.…”

Section: Introductionmentioning

confidence: 99%

Robust in-fiber spatial interferometer using multicore fiber for vibration detection

et al. 2018

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We report the demonstration of a novel in-fiber spatially integrated Michelson interferometer based on weakly coupled multicore fiber (MCF) for vibration sensing. The compact interferometer is constructed by using two separate cores of the MCF, where the fiber end is cleaved in order to generate strong Fresnel reflection, and independent light coupling between the cores of MCF and the single mode fibers (SMFs) is enabled by the fanin coupler. Vibration gives rise to differential strain variation between cores which results in the modification of phase difference of the interferometer. A narrow linewidth laser is employed, in order to interrogate the phase change induced reflection power variation. Vibration event can be identified and the vibration frequency can be retrieved by processing the measured reflection power with fast Fourier transform (FFT). Broad vibration frequency response range up to 12 kHz (limited by the cutoff frequency of the voltage driver of the vibration source) has been achieved. Performance of the sensor has been shown to be independent of the selection of different core pairs, where the MCF is wound to a piezoelectric transducer (PZT). The proposed in-fiber integrated spatial interferometer does not require any special processing of the fiber (e.g., tapering, splicing, and so forth). The unique sensor structure provides some extraordinary merits, including ultra-compact size, high mechanical strength, high sensitivity and temperature insensitivity.

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Section: Introductionmentioning

confidence: 99%

Robust in-fiber spatial interferometer using multicore fiber for vibration detection

et al. 2018

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“…At the same time, an optical fiber infrasound sensor based on ultraviolet adhesive diaphragm is introduced in Wuhan National Laboratory, which shows good acoustic response between 1 Hz and 20 kHz [17]. Subsequently, an acoustic sensor was proposed [18], in which a tapered optical fiber was attached to a nitrile-butadiene diaphragm. Under the action of acoustic pressure, tapered optical fibers bend with the deformation of diaphragm, and finally show a calculable change in transmission power.…”

Section: A Optical Fiber Acoustic Sensors Based On Fpimentioning

confidence: 99%

A Comprehensive Study of Optical Fiber Acoustic Sensing

et al. 2019

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The optical fiber acoustic sensing system is suitable for long-distance monitoring of the acoustic signals generated by the external disturbances. According to the continuity of sensing units, quasi-distributed and distributed optical fiber acoustic sensing technologies are differentiated to meet different application requirements. On the one hand, the recent progress of Fabry-Perot interferometer (FPI) focusing on the diaphragm material, and the research hotspots in the field of the continuous Fiber Bragg grating (FBG) array are firstly reviewed. On the other hand, Mach-Zehnder interferometry (MZI), Michelson interferometry (MI), and Sagnac interferometry (SI) have rapidly developed in the aspect of the demodulation algorithm optimization with the purpose of the sensing performance improvement. Moreover, the current primary research works of the phase-sensitive optical time-domain reflectometer (ϕ-OTDR) are the signalto-noise ratio improvement and the mixed optical structure design. Finally, this paper presents an overview of the recent advances of optical fiber acoustic sensing system in the application domains of military defense, structural health monitoring, petroleum exploration, and development. INDEX TERMS Acoustic detection, distributed acoustic sensing, optical fiber sensing, ϕ-OTDR, structural health monitoring.

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“…The diaphragm deflection varies linearly for the acoustic pressure signals with a frequency less than the natural frequency ( f=f m ) of the diaphragm and it is maximum at the natural frequency. The first order natural frequency ( f 0 ) for a properly clamped circular diaphragm can be defined as [26], figure 6. The results are shown in figure 5 as dashed lines where we have considered the experimental parameters of STF in position P 2 (z=2 mm, x=4.11 mm).…”

Section: Sensor Design and Its Working Principlementioning

confidence: 99%

“…However, materializing the wavelength/phase dependent principles requires the use of costly interrogators, which inevitably adds to the overall cost of the microphone system. In our previous publications, we have demonstrated an intensity dependent sensing scheme which utilized a low cost and easily fabricated tapered fibre along with a nitrile diaphragm for acoustic sensing [26]. This SMF taper based acoustic sensing structure addresses the issue of costly interrogator while retaining the advantages of simple structure and ease of fabrication.…”

Section: Introductionmentioning

confidence: 99%

S-shaped microfiber based diaphragm supported optical microphone

2019

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We propose and demonstrate a simple and highly sensitive optical microphone based on S-shaped tapered fibre (STF). The short pigtailed end of the STF is attached to the centre of a thin circular nitrile diaphragm. The applied acoustic signal deforms the nitrile diaphragm and due to the affixation, the STF structure gets modified leading to change in the bending angles of the two STF bends. As a consequence, the photodetector output, detecting the reflected light intensity of the STF, varies in accordance with the applied acoustic signal. Various properties of the proposed sensing setup can be easily tailored by changing the diaphragm diameter and thickness, and the shapes and size of the STF. For an optimized configuration, the proposed sensor achieves a sensitivity of 3.07 mV Pa −1 and a minimum detectable pressure of 36.48 mPa Hz −1 . The sensor shows a linear behaviour up to 1300 Hz and the experimental value of its first order natural frequency is

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Tapered Fiber Attached Nitrile Diaphragm-Based Acoustic Sensor

Cited by 36 publications

References 44 publications

Robust in-fiber spatial interferometer using multicore fiber for vibration detection

Robust in-fiber spatial interferometer using multicore fiber for vibration detection

A Comprehensive Study of Optical Fiber Acoustic Sensing

S-shaped microfiber based diaphragm supported optical microphone

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