Lang Bai, Gang Zheng, Xiongxing Zhang, Bin Sun. Optical Fiber Pressure Sensor Based on Frequency-Modulated Continuous-Wave and Analysis of Its Measurement Characteristic[J]. Acta Optica Sinica, 2021, 41(3): 0328002
- Acta Optica Sinica
- Vol. 41, Issue 3, 0328002 (2021)
Fig. 1. Schematic of frequency-modulated continuous wave laser interference pressure sensor
Fig. 2. Variation of angular frequency of reference and signal waves with time
Fig. 3. Sawtooth wave frequency modulation (up) and frequency-modulated continuous wave beat frequency signal (below) waveforms
Fig. 4. Flow chart of demodulation of initial phase of beat signal of frequency-modulated continuous wave optical fiber pressure sensor
Fig. 5. Experimental system diagram of diaphragm frequency-modulated continuous wave optical fiber pressure sensor
Fig. 6. Sensitivity measurement of frequency-modulated continuous wave optical fiber pressure sensor
Fig. 7. Stability measurement of sensor at different pressures and the same temperature (25 ℃) of the thermostat. (a) 0 kPa; (b) 200 kPa; (c) 402 kPa; (d) 602 kPa
Fig. 8. Flow chart of system error elimination
Fig. 9. Random error distribution
Fig. 10. Normal distribution of random error
Fig. 11. Variation of F-P cavity length of Fabry-Perot cavity with temperature
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