ZHANG Chao, MA Wei-guang. IM/FM Phase Delay Time Measurement Method of Laser for TDLAS[J]. Spectroscopy and Spectral Analysis, 2014, 34(11): 2908
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The present paper presents an method of using fiber Michelson interferometer to measure the Intensity-frequency (IM/FM) phase delay change of the laser, it could realize the phase delay time measurement, while modulating the laser. Experimental results show that the laser output signal intensity-frequency (IM/FM) phase delay of the laser has some differences from the theoretical value. The proposed method can be used to compensate for real-time signal strength-frequency (IM/FM) phase delay effect on the gas concentration measurement results.