Yue Shang, Tengfei Wu, Jiarui Lin, Linghui Yang, Qiang Zhou, Jigui Zhu. Frequency Scanning Interferometry Absolute Distance Measurement Method Based on Optical Spectrum Calibration[J]. Acta Optica Sinica, 2022, 42(12): 1212001
- Acta Optica Sinica
- Vol. 42, Issue 12, 1212001 (2022)
Fig. 1. FSI ranging system based on fiber auxiliary interferometer
Fig. 2. Influence of temperature variation on distance measurement accuracy of FSI system
Fig. 3. Influence of dispersion mismatch on distance measurement accuracy. (a) Phase residual for different distance; (b) measurement error for different distance
Fig. 4. Gas absorption cell calibration system based on femtosecond optical frequency comb
Fig. 5. Calibration of absorption spectrum based on femtosecond optical frequency comb
Fig. 6. FSI system based on absorption spectrum
Fig. 7. Absorption spectrum of HCN
Fig. 8. Absorption spectrum calibration based on optical frequency comb. (a) Absorption signal after resampling; (b) heterodyne signal after resampling; (c) fitting curve of absorption spectrum
Fig. 9. Results of verification experiment. (a) Variations of temperature and OPD with time; (b) distance measurement results before and after calibration
Fig. 10. Schematics of accuracy comparison experiment
Fig. 11. Results of experiment
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Table 1. Calibrated optical frequency interval between absorption lines
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