Acta Photonica Sinica, Volume. 48, Issue 2, 201003(2019)
Calibration of Frequency Discriminator and Application for Doppler Lidar Based on Fiber Mach-Zehnder Interferometer
The wind measuring sensitivity and dynamic range for Fiber Mach-Zehnder Interferometer (FMZI) based Doppler lidar are analyzed. The detection dynamic range is ±199.5 m/s and ±13.3 m/s for 0.1 m and 1.5 m Optical Path Difference (OPD). The optimal sensitivity is 2.15% with the change of wind speed of 1 m/s, corresponding to an optimal OPD of 0.45 m. The OPD error will result in retrieval wind velocity error. When the OPD is equal to 0.145 9 m or 1.088 9 m, the retrieval wind velocity error is 1.028 m/s or 0.138 m/s for 1 nm OPD error. We employed laser wavelength tuning method to determine the OPD of FMZI. The experiment has been implemented to calibrate OPD. This interferometer is used as a frequency discriminator in the lidar to detect the actual wind speed. The inversion of the wind speed is in good agreement with the coherent detection of the wind speed, which proves the correctness of the calibration detection.
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WANG Li, CHEN Kai, CHEN Xu, GAO Fei, WANG Jun, YAN Qing, YAN Wen-xiu, HUA Deng-xin. Calibration of Frequency Discriminator and Application for Doppler Lidar Based on Fiber Mach-Zehnder Interferometer[J]. Acta Photonica Sinica, 2019, 48(2): 201003
Received: Oct. 28, 2018
Accepted: --
Published Online: Mar. 23, 2019
The Author Email: Li WANG (wlfuyun@xaut.edu.cn)