Ling Ju, Beibei Weng, Xiling Niu, Chuanlu Deng, Yi Huang. Ultrasonic Detection Based on Diaphragm Optical Fiber Fabry-Perot Sensor[J]. Laser & Optoelectronics Progress, 2023, 60(15): 1506002
- Laser & Optoelectronics Progress
- Vol. 60, Issue 15, 1506002 (2023)
Fig. 1. Schematic diagram of optical fiber Fabry-Perot(F-P) sensor
Fig. 2. Sensing mechanism diagram of optical fiber F-P cavity acoustic sensor
Fig. 3. Establishment of simulated acoustic field. (a) 3D simulation model of acoustic field and diaphragm; (b) changes in position of acoustic source relative to diaphragm
Fig. 4. Relation between deformation of diaphragm and distance. (a) Deformation of diaphragm at different distances; (b) relation between maximum deformation of diaphragm and distance
Fig. 5. Relation between deformation of diaphragm and angle. (a) Deformation of diaphragm at different angles; (b) relation between maximum deformation of diaphragm and angle
Fig. 6. Schematic diagram of sensor preparation process. (a) Welding for the first time; (b) cutting for the first time; (c) welding for the second time; (d) cutting for the second time; (e) polishing
Fig. 7. Images of sensor and its spectra before and after polishing. (a) Images of sensor before and after polishing; (b) spectra of sensor before and after polishing
Fig. 8. Schematic diagram of optical fiber F-P ultrasonic sensing system
Fig. 9. Time-domain and frequency-domain signals of 20, 40, and 60 kHz
Fig. 10. Frequency response range of F-P ultrasonic sensor
Fig. 11. Working point position of each sensor sample
Fig. 12. Influence of distance and angle on sensing effect. (a) SNR at different distances; (b) SNR at different angles
Fig. 13. GIS partial discharge simulation device
Fig. 14. Partial discharge detection results of F-P sensor and current transformer (CT). (a) 4.7 kV voltage is applied;(b) 5.1 kV voltage is applied
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Table 1. Sample parameters
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Table 2. Comparison of performance indexes of optical fiber acoustic sensor
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