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12 May 2011 Techniques for improved performances of direct-detection three-dimensional imaging laser radar system using Geiger-mode avalanche photodiode
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Abstract
Direct-detection three-dimensional imaging laser radar system using Geiger-mode av.alanche photodiode (GAPD) is investigated in order to acquire three-dimensional images of objects at a long distance (more than 100m). Due to extremely high sensitivity of the GAPD, a laser radar system using GAPD is not only advantageous in terms of ranging a distant object but also in detecting a target screened by a sparse obstacle located in front of it. Both laser radar systems using a single-pixel GAPD and 1x8-pixel GAPD focal plane array as detectors are built up and analyzed. Passively Q-switched microchip laser is used as a laser source and a compact peripheral component interconnect system, which includes a time-to-digital converter (TDC), is set up. With both the GAPD having short dead-time (45ns) and the TDC functioning multi-stop acquisition, the system operates in a multi-hit mode. Three-dimensional images taken by the laser radar systems are shown. Both the single-shot precision and the dependence of the precision on the effective number of laser pulses are shown. Range walk reduction and autofocus techniques are proposed and demonstrated experimentally; they improve the accuracy and transverse spatial resolution of the laser radar system, respectively.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Min Seok Oh, Tae Hoon Kim, Sung Eun Jo, and Hong Jin Kong "Techniques for improved performances of direct-detection three-dimensional imaging laser radar system using Geiger-mode avalanche photodiode", Proc. SPIE 8033, Advanced Photon Counting Techniques V, 80330E (12 May 2011); https://doi.org/10.1117/12.884816
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