Lang Bai, Gang Zheng, Xiongxing Zhang, Bin Sun. Optical Fiber Frequency-Modulation Continuous-Wave Laser Interference Liquid Level Sensor[J]. Laser & Optoelectronics Progress, 2021, 58(7): 0714009
- Laser & Optoelectronics Progress
- Vol. 58, Issue 7, 0714009 (2021)
Fig. 1. Schematic of FMCW interference
Fig. 2. Curves of angular frequency of reference wave and signal wave with modulation current of sawtooth wave
Fig. 3. Waveform of FMCW beat frequency signal with sawtooth current modulation
Fig. 4. Physical image of liquid level sensor
Fig. 5. Experimental system of diaphragm type frequency modulation continuous wave optical fiber liquid level sensor
Fig. 6. Flow chart of initial phase demodulation of beat signal
Fig. 7. Physical image of liquid level measurement system
Fig. 8. Linearity and sensitivity characteristics of liquid level sensor
Fig. 9. Analysis of hysteresis of liquid level sensor
Fig. 10. Repeatability analysis of liquid level sensor
Fig. 11. Stability data graph of liquid level sensor
Fig. 12. Stability analysis of liquid level sensor
Fig. 13. Stability measurement results of liquid depth of 100 mm at the same temperature
Fig. 14. Random error points of shape variable at diaphragm center when liquid depth is 100 mm at the same temperature
Fig. 15. Normal distribution of random error of diaphragm central deformation at the same temperature with liquid level depth of 100 mm
Fig. 16. Temperature characteristics of liquid level sensor
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