Optimization Design of Fiber Optic Ultrasonic Sensor Based on Coupling Cone Structure

Zijie Zou; Zhongbao Qin; Yiyi Li; Qi Liu; Jianwei Chen

doi:10.3788/AOS202040.2306004

Acta Optica Sinica, Volume. 40, Issue 23, 2306004(2020)

Optimization Design of Fiber Optic Ultrasonic Sensor Based on Coupling Cone Structure

Zijie Zou¹, Zhongbao Qin^1、*, Yiyi Li², Qi Liu¹, and Jianwei Chen³

Author Affiliations

¹Department of Basic, Rocket Force University of Engineering, Xi'an, shannxi 710025, China

²The 96863 Army of the Chinese People's Liberation, Luoyang, Henan 471000, China

³College of missile engineering, Rocket Force University of Engineering, Xi'an, shannxi 710025, China

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Abstract Get PDF(in Chinese)

Figures & Tables(15)

Fig. 1. Schematic diagram of spectral sideband filtering method

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Fig. 2. Finite element model of fiber optic ultrasonic sensor. (a) Grid; (b) amplitude distribution

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Fig. 3. Curve of relative amplitude with relative Young's modulus

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Fig. 4. Curve of relative amplitude with Poisson's ratio

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Fig. 5. Curve of relative amplitude with cone angle. (a) Aluminum;(b)PMMA;(c) polystyrene;(d) natural rubber

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Fig. 6. Time domain spectrum of optical fiber amplitude maximum point. (a) Aluminum; (b) PMMA; (c) polystyrene; (d) natural rubber

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Fig. 7. Optical fiber ultrasonic sensor. (a) 3D model; (b) physical image

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Fig. 8. Experimental equipment

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Fig. 9. Ultrasonic signals of 3 types of aluminum cone sensors. (a) AB glue; (b) 502 glue; (c) glass glue

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Fig. 10. Test results of 4 sensors. (a) Aluminum; (b) PMMA; (c) polystyrene; (d) natural rubber

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Fig. 11. Signal spectra collected by different sensors

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Table 1. Number of peaks of the curves under different Young's modulus
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Table 1. Number of peaks of the curves under different Young's modulus
E /GPa 0.7 7 20 70 200
Number of wave crests 11 10 7 2 2

Table 2. Parameter of coupling cone material
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Table 2. Parameter of coupling cone material
Material Aluminum PMMA Polystyrene Natural rubber
E /GPa 70 3 3.2 0.1
μ 0.33 0.32 0.35 0.49
Density ρ /(g·cm^-3) 2.7 1.18 1.05 0.93
Acoustic impedance / [10⁶ kg·(m²·s)^-1] 17 3.1 1.7 2

Table 3. Optimum angle and maximum amplitude of each sensor
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Table 3. Optimum angle and maximum amplitude of each sensor
Coupling cone material Aluminum PMMA Polystyrene Natural rubber
Angle /(°) 74 30 130 126
ε /mm 1.25×10^-7 9.66×10^-8 3.8×10^-6 3.94×10^-7

Table 4. SNR, volume and quality of different sensors

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Table 4. SNR, volume and quality of different sensors

Sensor type	Sensor of our paper				Existing sensor
Sensor type	74°Aluminum	30°PMMA	130°Polystyrene	126°Natural rubber	PMMA	Aluminum
SNR /dB	77.57	75.59	98.48	81.06	78.90	74.50
Volume /mm³	1780	225	14433	12062	4906	4906
Quality /g	4.81	0.27	15.15	11.22	5.79	13.25

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Zijie Zou, Zhongbao Qin, Yiyi Li, Qi Liu, Jianwei Chen. Optimization Design of Fiber Optic Ultrasonic Sensor Based on Coupling Cone Structure[J]. Acta Optica Sinica, 2020, 40(23): 2306004

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