Structural Design and Investigation of Micro-Broadband Fiber Bragg Grating Vibration Sensor

Huizhi Zhao; Mingli Dong; Jingtao Xin; Yanming Song; Xu Zhang; Jun Wu

doi:10.3788/LOP223149

Laser & Optoelectronics Progress, Volume. 61, Issue 9, 0906007(2024)

Structural Design and Investigation of Micro-Broadband Fiber Bragg Grating Vibration Sensor

Huizhi Zhao¹, Mingli Dong^1,2, Jingtao Xin^1,2、*, Yanming Song^1,2, Xu Zhang³, and Jun Wu⁴

¹School of Instrument Science and Opto-Electronics Engineering, Beijing Information Science and Technology University, Beijing 100192, China

²Beijing Laboratory of Optical Fiber Sensing and Systems, Beijing Information Science and Technology University, Beijing 100016, China

³School of Precision Instrument and Optoelectronic Engineering, Tianjin University, Tianjin 300072, China

⁴Beijing Institute of Space Electromechanics, Beijing 100089, China

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Figures & Tables(18)

Fig. 1. Schematic diagram of acceleration sensor structure

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Fig. 2. Mechanical analysis diagram of acceleration sensor

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Fig. 3. Variation curves of d with q and p. (a) Variation curve of d with q; (b) variation curve of d with p

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Fig. 4. Variation curves of S and f with d. (a) Different hole diameters; (b) different hole positions

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Fig. 5. Sensor stress profile. (a) Mass block not hollow; (b) mass block hollow

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Fig. 6. Amplitude-frequency response simulation curve

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Fig. 7. Spectra of FBG

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Fig. 8. Pictorial diagram of the sensor

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Fig. 9. Vibration signal calibration system

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Fig. 10. Variation curve of wavelength change with excitation frequency

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Fig. 11. Time-domain/frequency-domain characteristics of the sensor under 1g and 100 Hz excitation. (a) Time-domain response characteristics; (b) frequency-domain response characteristics

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Fig. 12. Variation curve of Sensitivity

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Fig. 13. Variation curve of acceleration amplitude with time of sensor

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Fig. 14. Time-domain characteristic curve of main axis direction and cross axis direction

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Fig. 15. Repeatability test

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Table 1. Design parameters of the sensor
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Table 1. Design parameters of the sensor
Parameter Value
A_f /mm² 0.005024
E_f /GPa 72
l /mm 1.5
R /mm 1
p /mm 3
q /mm 1.5
m /g 5.465
d /mm 4.63116
h /mm 9
$ω$ /mm 11
b /mm 0.36
E /GPa 90
λ /nm 1556.69

Table 2. Sensor parameters of different structures
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Table 2. Sensor parameters of different structures
Sensor structure Natural frequency f /Hz S /（pm·g^-1）
Mass block not hollow 1141 129.53
Mass block hollow 1231 128.64

Table 3. Research status of fiber grating vibration sensor

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Table 3. Research status of fiber grating vibration sensor

Reference	Sensor structure	f /Hz	S /（pm·g^-1）
［11］	Torsion beam	1180	6.290
［12］	Accelerometer	>2000
［13］	Accelerometer	3000	19
［14］	Diaphragm	1240	45.9
［15］	Hinge	1525	12
［16］	Hinge	2300	29
［17］	Diaphragm	600	20.189
［18］	Compliant cylinder	400	42.7
Our method	Hinge	1250	69.4

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Huizhi Zhao, Mingli Dong, Jingtao Xin, Yanming Song, Xu Zhang, Jun Wu. Structural Design and Investigation of Micro-Broadband Fiber Bragg Grating Vibration Sensor[J]. Laser & Optoelectronics Progress, 2024, 61(9): 0906007

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