Acta Photonica Sinica, Volume. 48, Issue 9, 906004(2019)
Algorithm of Phase Correction Based on Least Square Estimation for Optical Fiber FabryPerot Sensor
To improve the demodulation precision and efficiency of fiberoptic FabryPerot sensor, a series of optical path differences are calculated by using the peaks of the interference spectrum, and the rough demodulation result and the additional phase are obtained according to least square estimation such that the variance of the optical path differences is minimized. The spectral additional phase is corrected to obtain the compensated optical path difference .The final demodulation result is made up of the rough optical path difference and the compensation optical path difference. The simulation results show that the error of the algorithm is less than ±2.5 nm. The FabryPerot high temperature experiment results show that when the temperature is raised from room temperature to 1 000℃, the algorithm demodulates the optical path difference precision to 5.4 nm, the corresponding temperature precision is ±0.36‰F.S., and the average calculation speed is 400 times faster than that of FFTMMSE at the same condition. The algorithm is characterized by high precision and high calculating speed.
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LIU Jiajing, TU Ziwei, ZHOU Ciming, FAN Dian. Algorithm of Phase Correction Based on Least Square Estimation for Optical Fiber FabryPerot Sensor[J]. Acta Photonica Sinica, 2019, 48(9): 906004
Received: May. 20, 2019
Accepted: --
Published Online: Oct. 12, 2019
The Author Email: Jiajing LIU (562343527@qq.com)