New phase measurement method for laser rangefinder

Wen-jun Sun; Jing-nan Sun; Wen-bin Bu; Zhong Meng

doi:10.1117/12.864299

12 October 2010 New phase measurement method for laser rangefinder

Wen-jun Sun, Jing-nan Sun, Wen-bin Bu, Zhong Meng

Proceedings Volume 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 76565X (2010) https://doi.org/10.1117/12.864299
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

A new phase measurement method is designed and presented by using the technique of signal shifting phase and the technique of signal multiplication for laser rangefinder. The intensity of laser light is modulated by cosine circuit signal, at the same time the cosine circuit signal is thansformed sine signal by the shifting phase technique. Two signals mentioned above are multiplied by received signal from the target respectively, then being transmitted into signal processor after passing through low band filter respectively. The result of phase-shift between the received signal and sent signal is calculated by means of signal processor and time-counter with double frequency of modulation signal. The proposed system is composed of four units such as control and count unit, emitting and receiving unit of laser light, signal processing unit and result display unit. The two most advantages of proposed system over others are its ability of proper isolation which reduces crosstalk and its independency thermal drift. Theoretical calculations and experimental results have shown the accuracy better than 2 mm.

Citation Download Citation

Wen-jun Sun, Jing-nan Sun, Wen-bin Bu, and Zhong Meng "New phase measurement method for laser rangefinder", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76565X (12 October 2010); https://doi.org/10.1117/12.864299

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KEYWORDS

Phase shift keying

Signal processing

Modulation

Phase measurement

Control systems

Semiconductor lasers

Distance measurement

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