ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Laser phase noise compensation method in frequency scanning interferometry for absolute distance measurement
Received date: 2024-04-22
Revised date: 2024-05-06
Accepted date: 2024-06-01
Online published: 2024-06-21
Supported by
National Natural Science Foundation of China(52205576);Optoelectronic Measurement and Intelligent Perception Zhongguancun Open Lab(LabSOMP-2023-04);Natural Science Basic Research Program of Shaanxi(2021JQ-187)
The technique of absolute distance measurement with laser Frequency Scanning Interferometry （FSI） holds immense potential for various space science missions and aerospace engineering applications. However， the laser phase noise from the tunable light source significantly degrades the distance measurement resolution over long distances. To address this issue， this paper establishes an FSI absolute distance measurement system with a fiber optic reference interferometer. On this basis， a laser phase noise compensation method is proposed based on the hierarchical decomposition of interferometric signal noise phase error terms. The effectiveness of the proposed laser phase noise compensation method is validated through simulation and experiment. Simulation results demonstrate that at distances of 100 m， 200 m， and 500 m， employing the proposed method enhances the signal-to-noise ratio of the interferometric signal from -23.06 dB， -32.95 dB， -40.21 dB to 33.97 dB， 33.98 dB， and 33.97 dB， respectively， significantly improving distance resolution. Experimental distance measurement results indicate that with a measured fiber length of 114.887 m， utilizing the proposed method elevates the signal-to-noise ratio of the interferometric signal from -19.08 dB to -2.22 dB， resulting in a notable enhancement in distance resolution.
Zhongwen DENG , Shaogang GUO , Wenjun CHEN , Hengkang ZHANG , Haifeng SUN , Lirong SHEN , Xiaoping LI . Laser phase noise compensation method in frequency scanning interferometry for absolute distance measurement[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2025 , 46(3) : 630561 -630561 . DOI: 10.7527/S1000-6893.2024.30561
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