Cross spring leaf-based high-sensitivity low-frequency dual-FBG acceleration sensor

Yuntian Teng; Bingbing Zhang; Bingbing Zhang; Bingbing Zhang; Xiaoyong Fan; Jiemei Ma; Zhongchao Qiu; Zhongchao Qiu; Zhongchao Qiu

doi:10.1364/AO.465422

Applied Optics
Vol. 61,
Issue 25,
pp. 7521-7531
(2022)
•https://doi.org/10.1364/AO.465422

Cross spring leaf-based high-sensitivity low-frequency dual-FBG acceleration sensor

Yuntian Teng, Bingbing Zhang, Xiaoyong Fan, Jiemei Ma, and Zhongchao Qiu

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Yuntian Teng, Bingbing Zhang, Xiaoyong Fan, Jiemei Ma, and Zhongchao Qiu, "Cross spring leaf-based high-sensitivity low-frequency dual-FBG acceleration sensor," Appl. Opt. 61, 7521-7531 (2022)

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Table of Contents Category
- Optical Devices, Sensors, and Detectors
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About this Article
History
- Original Manuscript: June 3, 2022
- Revised Manuscript: August 10, 2022
- Manuscript Accepted: August 17, 2022
- Published: August 29, 2022

Abstract

The measurement of low-frequency vibration signals is of great significance in seismic monitoring, health monitoring of large and medium-sized engineering structures, and resource exploration. In view of the low sensitivity of fiber Bragg grating (FBG) acceleration sensors in measuring low-frequency vibration signals, a high-sensitivity, low-frequency dual-FBG acceleration sensor is proposed. Theoretical formula derivation and ANSYS software were used to optimize the design and simulation analysis of the structural parameters of the sensor. The real sensor was made based on the simulation results, and a test system was established to test its performance. According to the findings, the natural frequency of the acceleration sensor is 65 Hz. It gives a flat sensitivity response in the low frequency band of 3–45 Hz. The dynamic range is 92.63 dB at 10 Hz, the acceleration sensitivity is 1498.29 pm/g, and the linearity ${{\rm R}^2}$ is 0.9998. The relative standard deviation of the sensor repeatability is 1.75%, and the transverse crosstalk in the working frequency band is ${-}{33.99}\;{\rm dB}$. Designed with a high sensitivity and excellent temperature compensation capacity in the low-frequency band, the designed sensor is suitable for low- and medium-frequency vibration detection in engineering.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Structure Parameters	Numerical Values
Effective length of optical fiber $l$	15 mm
Distance from the center of cross spring leaf to the optical fiber $L_{1}$	5.8 mm
Distance from the center of cross spring leaf to the rigid beam $L_{2}$	3.35 mm
Distance from the center of cross spring leafto the center of mass block $L_{3}$	28.2 mm
Mass of the mass block $m$	10 g
Length of the cross spring leaf $d$	4.4 mm
Width of the cross spring leaf $b$	2 mm
Thickness of the cross spring leaf $h$	0.4 mm
Central wavelength of the FBG $λ_{B}$	1560 nm
Cross-sectional area of the optical fiber $A_{f}$	$1.23 \times 10^{- 8} m^{2}$
Effective elasto-optical coefficient of the optical fiber $P_{e}$	0.22

Research Group	Sensitivity (pm/g)	Resonant Frequency (Hz)	Measurable Frequency Range (Hz)	Cross-axis Sensitivity	Self-temperature Compensation
Weng et al. [12]	106.5	220	1–110	2.11%	–
Udos et al. [13]	7.1	70	20–100	–	–
Liu et al. [14]	1067	46	0.7–20	6.9%	–
Khan et al. [15]	46; 306	220	DC-50; 150–250	–	–
Feng et al. [16]	218.4	210	10–150	3.2%	Yes
Parida et al. [17]	821	64	5–40	0.32%	Yes
This work	1498.29	65	3–45	1.99%	Yes

Structure Parameters	Numerical Values
Effective length of optical fiber $l$	15 mm
Distance from the center of cross spring leaf to the optical fiber $L_{1}$	5.8 mm
Distance from the center of cross spring leaf to the rigid beam $L_{2}$	3.35 mm
Distance from the center of cross spring leafto the center of mass block $L_{3}$	28.2 mm
Mass of the mass block $m$	10 g
Length of the cross spring leaf $d$	4.4 mm
Width of the cross spring leaf $b$	2 mm
Thickness of the cross spring leaf $h$	0.4 mm
Central wavelength of the FBG $λ_{B}$	1560 nm
Cross-sectional area of the optical fiber $A_{f}$	$1.23 \times 10^{- 8} m^{2}$
Effective elasto-optical coefficient of the optical fiber $P_{e}$	0.22

Research Group	Sensitivity (pm/g)	Resonant Frequency (Hz)	Measurable Frequency Range (Hz)	Cross-axis Sensitivity	Self-temperature Compensation
Weng et al. [12]	106.5	220	1–110	2.11%	–
Udos et al. [13]	7.1	70	20–100	–	–
Liu et al. [14]	1067	46	0.7–20	6.9%	–
Khan et al. [15]	46; 306	220	DC-50; 150–250	–	–
Feng et al. [16]	218.4	210	10–150	3.2%	Yes
Parida et al. [17]	821	64	5–40	0.32%	Yes
This work	1498.29	65	3–45	1.99%	Yes

Abstract

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Tables (2)

Equations (10)

Applied Optics