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Proceedings Paper

Feasibility study to determine correct focus by analyzing photon distributions on Geiger-mode avalanche photodiode focal plane array
Author(s): Tae Hoon Kim; Hong Jin Kong; Sung Eun Jo; Min Seok Oh
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Paper Abstract

A method to determine correct focus in direct detection laser radar system using Geiger-mode avalanche photodiode focal plane array (GmAPD-FPA) is proposed. It is implemented by laser pulses with controlled beam diameter and energy on a distant target. And the time-of-flight (TOF) of laser pulses are obtained for each pixel in GmAPD-FPA. With multiple laser pulses, time correlated single photon counting (TCSPC) is carried out to obtain target detection probability. Using target detection probabilities of each pixel, the photon distribution on GmAPD-FPA is acquired. The condition to determine correct focus is the minimum photon distribution in GmAPD-FPA. In theory part, the range of laser pulse energy is decided. The experiments are carried out with commercial 1x8 pixel GmAPD-FPA. The experimental results show that the focus position is founded using this method and a spatial resolution of a laser radar system is improved where the 1x8 pixel GmAPD-FPA is located in focus position.

Paper Details

Date Published: 1 June 2011
PDF: 6 pages
Proc. SPIE 8037, Laser Radar Technology and Applications XVI, 80371I (1 June 2011); doi: 10.1117/12.883105
Show Author Affiliations
Tae Hoon Kim, KAIST (Korea, Republic of)
Hong Jin Kong, KAIST (Korea, Republic of)
Sung Eun Jo, KAIST (Korea, Republic of)
Min Seok Oh, KAIST (Korea, Republic of)
Samsung Electronics Co. (Korea, Republic of)

Published in SPIE Proceedings Vol. 8037:
Laser Radar Technology and Applications XVI
Monte D. Turner; Gary W. Kamerman, Editor(s)

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