Qiming Sheng, Gang Zheng, Xiongxing Zhang, Yuan Han, Yuan Guo, Mengdi Nie. Fast Signal Processing Method for Frequency-Modulated Continuous-Wave Interferometric Fiber-Optic Displacement Sensor[J]. Laser & Optoelectronics Progress, 2021, 58(21): 2112003
- Laser & Optoelectronics Progress
- Vol. 58, Issue 21, 2112003 (2021)
Fig. 1. Schematic of FMCW fiber-optic displacement sensor
Fig. 2. Optical measurement structure of FMCW optical-fiber displacement sensor
Fig. 3. Schematic of DMA transfer process. (a) Sawtooth wave modulation signal output; (b) beat frequency signal acquisition
Fig. 4. DMA interrupt calculation process
Fig. 5. Schematic of calculating steps of beat signal. (a) Interception of valid signal; (b) calculation of theoretical wave peaks; (c) calculation of theoretical troughs; (d) calculation of amplitude and zero bias; (e) trends in extrapolating beat signals; (f) standard beat signal at fixed point
Fig. 6. Phase solution results of inverse cosine look-up method. (a) Calculation of relative amplitude; (b) curve of arccosine tables
Fig. 7. Result of integral period phase accumulation. (a) Δφ>π; (b) Δφ<π
Fig. 8. Experimental devices
Fig. 9. Standard deviation and time consuming of displacement drift at different fixed points
Fig. 10. Standard deviation of measurement error under different displacements. (a) 200 mm; (b) 400 mm; (c) 600 mm
Fig. 11. Linearity and repeatability test results
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Table 1. Performance comparison between peak prediction phase detection algorithm and existing algorithms
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