Chinese Optics Letters, Volume. 22, Issue 1, 011204(2024)
High synchronization absolute distance measurement using a heterodyne and superheterodyne combined interferometer
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Fig. 1. Schematic diagram of the main composition of the MWI based on heterodyne and superheterodyne absolute distance measurement method with a He–Ne laser. HWP, half-wave plate; PBS, polarizing beam splitter; M, mirror; AOFS, acousto-optical frequency shifter; QWP, quarter-wave plate; NPBS, nonpolarizing beam splitter; RR, retroreflector; P, polarizer; PD, photodetector.
Fig. 3. Schematic setup for the synchronous detection and demodulation. A, amplifier; LPF, low-pass filter.
Fig. 4. Phase measurement data when the phase difference was set to (a) 90° and (b) 180°.
Fig. 5. (a) Experimental setup for absolute distance measurement based on heterodyne and superheterodyne combined absolute distance interferometry. (b) Experimental results of distance measurement at 2 m.
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Ziqi Yin, Fangfei Li, Yunke Sun, Yun Zou, Yan Wang, Hongxing Yang, Pengcheng Hu, Haijin Fu, Jiubin Tan. High synchronization absolute distance measurement using a heterodyne and superheterodyne combined interferometer[J]. Chinese Optics Letters, 2024, 22(1): 011204
Paper Information
Category: Instrumentation, Measurement, and Optical Sensing
Received: Jul. 4, 2023
Accepted: Sep. 18, 2023
Published Online: Jan. 9, 2024
The Author Email: Hongxing Yang (takeon@126.com)
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