Fiber optic strain rate sensor based on a differentiating interferometer

Fig. 1. Fiber optic strain rate sensor system. ASE, amplified spontaneous emission light source; ISO, isolator; CIR, circulator; 3×3 OC, 3×3 optical coupler; 1×2 OC, 1×2 optical coupler; FRM, Faraday rotator mirror. Demodulator integrates photodetectors, analog input modules, and embedded controllers. Red and blue lines represent optical fibers and communication cables, respectively.

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Fig. 2. Demonstration of (a) three detection optical signals and (b) simulated strain rate and phase.

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Fig. 3. Comparison of measured sensitivity and theoretical curve.

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Fig. 4. Comparison of measured phase noise floor and equivalent phase noise of RIN.

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Fig. 5. Phase noise recorded for 10 min.

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Fig. 6. Recorded rectangular signal of 0.05 Hz.

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Fig. 7. Dynamic range for dynamic measurement.

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Fig. 8. Phase noise of FOSRS II recorded over 10 min.

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Table 1. Simulation Parameters of FOSRS

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Table 1. Simulation Parameters of FOSRS

Parameter	Symbol	Value
Central wavelength	$λ_{0}$	1545 nm
Spectral width	$Δ v$	4 THz
Strain-optic coefficient	$ξ$	0.78
Refractive index	$n$	1.4682
Length of the delay fiber	$L_{D}$	5 km
Length of the sensing fiber	$L$	10 m
Length of MZI’s short arm	$L_{0}$	1 m
DC of PD signals	$D_{i}$ ( $i = 1, 2, 3$ )	1 μW
AC of PD signals	$A_{i}$ ( $i = 1, 2, 3$ )	$0.5 sinc (π Δ v l_{opt} c) μW$

Table 2. Comparison of FOSRS and DAS

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Table 2. Comparison of FOSRS and DAS

Reference	Gauge Length	Description	Value ( $nε / s$ )
[13]	10 m	Noise RMS of DAS	90
[15]	10 m	Small transients within the persistent volcanic tremor	5
[35]	10 m	Stick-slip icequake in glaciated terrain	649
FOSRS I	12.1 m	Dynamic/static resolution	1.58/6.76
FOSRS II	25.277 km	Static resolution	0.017

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Huicong Li, Wenzhu Huang, Wentao Zhang, Jianxiang Zhang, "Fiber optic strain rate sensor based on a differentiating interferometer," Photonics Res. 10, 2599 (2022)

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Paper Information

Category: Instrumentation and Measurements

Received: Jul. 6, 2022

Accepted: Sep. 19, 2022

Published Online: Oct. 28, 2022

The Author Email: Wentao Zhang (zhangwt@semi.ac.cn)

DOI:10.1364/PRJ.468283

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology