Liqiang Jing, Gang Zheng, Xiongxing Zhang, Bin Sun, Lang Bai, Huan Wang. Nonlinear Correction of Frequency-Modulated Continuous Wave Interferometric Laser Sources[J]. Acta Optica Sinica, 2019, 39(11): 1114001
- Acta Optica Sinica
- Vol. 39, Issue 11, 1114001 (2019)
Fig. 1. Frequency-modulated continuous wave interference ranging system
Fig. 2. Angular frequency relationship of frequency-modulated continuous wave interference signal under saw-tooth wave modulation
Fig. 3. Ideal signals under linear current modulation. (a) Linearly modulated current waveform; (b) angular frequency of ideal optical signal; (c) ideal interference beat signal
Fig. 4. Signals obtained by current node correction method. (a) Actual measured beat signal; (b) ideal beat signal; (c) current waveform before and after nonlinear correction
Fig. 5. Frequency-modulated continuous wave interference ranging system
Fig. 6. Linear saw-tooth current modulation waveform and beat signal. (a) Modulation waveform; (b) beat signal
Fig. 7. Nonlinearly corrected current modulation waveform and beat signal. (a) Modulation waveform; (b) beat signal
Fig. 8. Position distribution of minimum points of beat signals before and after correction
Fig. 9. Spectrograms of beat signals before and after correction. (a) Before correction; (b) after correction
Fig. 10. Measurement results of fixed target
Fig. 11. Linearity and repeatability measurement of ranging system
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