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Proceedings Paper

Comparison of imaging laser radars based on range gating under different weather conditions
Author(s): Arno von der Fecht; Hendrik Rothe
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Paper Abstract

This paper discusses the development and the experimental results of two imaging laser radar systems based on range gating. We designed an 128 X 128 pixel laser radar working at the eye-safe wavelength of 1574 nm without a scanner. The laser is a Q-switched, flashlamp pumped, Nd:YAG laser with Optical Parametric Oscillator. It achieves 60 mJ output energy at the video range of 25 Hz. As detector we use a high sensitive (68% quantum efficiency) InGaAs camera with a special designed Electro-Optical Modulator objective providing 18 ns gating time. The first laser illuminated images will be presented. The second system is working at the wavelength of 532 nm and uses a gated viewing camera including a Multi Channel Plate II generation with a maximum gain of 18000. We examined the system performance under different weather conditions especially at a range between 500 m and 1500 m. For both systems the field of view is fixed at 12 mrad, that means we illuminate a 12 X 12 m field at 1 km range. The outdoor experiments were taken over a period of 2 weeks, where we had on the one hand sun and on the other hand light and moderate rain with a rainrate up to 10 mm/h and a visibility of 490 m.

Paper Details

Date Published: 8 September 1998
PDF: 11 pages
Proc. SPIE 3380, Laser Radar Technology and Applications III, (8 September 1998); doi: 10.1117/12.327202
Show Author Affiliations
Arno von der Fecht, Univ. of the Federal Armed Forces (Germany)
Hendrik Rothe, Univ. of the Federal Armed Forces (Germany)

Published in SPIE Proceedings Vol. 3380:
Laser Radar Technology and Applications III
Gary W. Kamerman, Editor(s)

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