Hanzheng Li, Gaomi Wu, Zhenjun Ma, Dipeng Ren, Mengying Zhang, Ran Gao, Zhimei Qi. Preparation of Fiber-Optic Interferometer Based Infrasound Sensor[J]. Laser & Optoelectronics Progress, 2019, 56(15): 150603
- Laser & Optoelectronics Progress
- Vol. 56, Issue 15, 150603 (2019)
Fig. 1. Structure of diaphragm EFPI sensor
Fig. 2. Relationship between output signal and low-frequency infrasound disturbance
Fig. 3. Result of first-order modal analysis by ANSYS
Fig. 4. Relationship between different model parameters and first-order resonant frequency. (a) Diaphragm material; (b) diaphragm thickness; (c) diaphragm radius; (d) diaphragm prestress
Fig. 5. Results of finite element harmonic response analysis by ANSYS (0-10 kHz)
Fig. 6. EFPI sensor. (a) Structural diagram; (b) photograph
Fig. 7. Interference spectrum of EFPI sensor
Fig. 8. Test device of optical fiber EFPI acoustic sensor
Fig. 9. Characterization of sensor characteristics. (a) Frequency response; (b) Sensitivity
Fig. 10. Signal output of sensor under 5 Hz sound source excitation. (a) Time domain; (b) frequency domain
Fig. 11. Signal output of sensor under 1 Hz sound source excitation. (a) Time domain; (b) frequency domain
Fig. 12. Signal output of sensor under 0.5 Hz sound source excitation. (a) Time domain; (b) frequency domain
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