High-precision 3D imaging using a pulsed diode laser

Chang Da Zhang; Zheng-hua Guan; Chong Shu He; Ding Ji Shi

doi:10.1117/12.144082

11 May 1993 High-precision 3D imaging using a pulsed diode laser

Chang Da Zhang, Zheng-hua Guan, Chong Shu He, Ding Ji Shi

Proceedings Volume 1979, 1992 International Conference on Lasers and Optoelectronics; (1993) https://doi.org/10.1117/12.144082
Event: 1992 International Conference on Lasers and Optoelectronics, 1992, Bejing, China

Abstract

Development of laser 3-D imaging is reviewed briefly in this paper. The stress is on the state of the art semiconductor laser and its potential use in 3-D imaging systems. Three methods of ranging, i.e., IM-PM, pulsed TOF, and FM-CW, are analyzed. We confirmed that it is necessary to use constant fraction discrimination (CFD) technique and high resolution timing technique in a pulsed system for obtaining high resolution ranging. The calculation of distance of reliable ranging and needed sample rate of 3-D imaging have been made. The approaches to implement high speed, high resolution counter circuitry are discussed. Ranging experiments were done using a pulsed diode laser with pulse duration of 70 ps, peak power of 1 W, and repetition rate of 200 KHZ, a Si APD with a response time of 370 ps was also used to detect the return signal, and a range counter with a time resolution of 66 ps was used to measure the distance. The experimental results show an excellent range accuracy of 1 to 2 cm in the wide dynamical range of signal amplitude.

Citation Download Citation

Chang Da Zhang, Zheng-hua Guan, Chong Shu He, and Ding Ji Shi "High-precision 3D imaging using a pulsed diode laser", Proc. SPIE 1979, 1992 International Conference on Lasers and Optoelectronics, (11 May 1993); https://doi.org/10.1117/12.144082

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