Two-wavelength pulsed-laser ranging system with an accuracy of centimeters

Shengyuan Zhong; Pin Cheng

doi:10.1117/12.144084

11 May 1993 Two-wavelength pulsed-laser ranging system with an accuracy of centimeters

Shengyuan Zhong, Pin Cheng

Proceedings Volume 1979, 1992 International Conference on Lasers and Optoelectronics; (1993) https://doi.org/10.1117/12.144084
Event: 1992 International Conference on Lasers and Optoelectronics, 1992, Bejing, China

Abstract

Theoretical analysis and experimental results of a two-wavelength pulsed laser ranging system are presented. In the system, a short Q-switched pulsewidth Nd:YAG laser and its second harmonic wave are used, MCP/PMT and APD are used to detect 0.53 micrometers and 1.06 micrometers , respectively, and a multichannel analyzer with CFD is used to measure the time interval of the two returning waves. The main factors that affect the precision of the ranging system include the second harmonic generation of the laser with modes instability and the transit time jitter of the detectors, target character affects the waveform, but for several ns pulsewidth laser wave, this is negligible. Experiment data expressed that the synthetical transit time jitter rms value of the two detectors is about 100 ps. Our ranging experiment revealed that with a consequent average of 50 measurements to a distance of several hundred meters the rms precision of the time interval of 0.53 micrometers and 1.06 micrometers is about 30 ps, and the rms precision of the ranging system can reach 10 cm.

Citation Download Citation

Shengyuan Zhong and Pin Cheng "Two-wavelength pulsed-laser ranging system with an accuracy of centimeters", Proc. SPIE 1979, 1992 International Conference on Lasers and Optoelectronics, (11 May 1993); https://doi.org/10.1117/12.144084

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