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Proceedings Paper

New UV-A laser-induced fluorescence imaging system for near-field remote sensing of vegetation: characteristics and performance
Author(s): Malgorzata Sowinska; Bernard Cunin; Francine Heisel; Joseph-Albert Miehe
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Paper Abstract

In this paper, a compact, new UV-A laser induced fluorescence imaging system implemented in an all-road car for near-field remote sensing of vegetation will be described. It has been developed as a part of a European Community Program INTERREG II* and is consisting of three main parts: excitation, detection and control units. The excitation light pulses (10 ns) are produced by a frequency tripled Nd:YAG laser emitting at 355 nm with a variable repetition rate up to approximately equals 22 kHz and a pulse energy typically of 40 (mu) J. The laser spot size is adjusted by means of a variable beam expander. Fluorescence images are recorded via entrance lenses and 10 nm bandpass filters with a gated intensified digital CCD camera operating at 50 frames per second. The 'head of the system' (laser and camera) can be directed in site and azimuth, and can be high until a 6 meters height. All the functions like the system positioning, localization and distance detection, spot size adjustment, focus, sharpness, selection of the filter, laser and camera synchronization, gain of the intensifier, real time visualization of images, acquisition time are controlled by a newly developed software which also allows image storage, analysis and treatment. Examples of remote sensing fluorescence images recorded at a distance between 10 and 30 m are presented.

Paper Details

Date Published: 28 May 1999
PDF: 12 pages
Proc. SPIE 3707, Laser Radar Technology and Applications IV, (28 May 1999); doi: 10.1117/12.351333
Show Author Affiliations
Malgorzata Sowinska, Groupe d'Optique Appliquee (France)
Bernard Cunin, Groupe d'Optique Appliquee (France)
Francine Heisel, Groupe d'Optique Appliquee (France)
Joseph-Albert Miehe, Groupe d'Optique Appliquee (France)


Published in SPIE Proceedings Vol. 3707:
Laser Radar Technology and Applications IV
Gary W. Kamerman; Christian Werner, Editor(s)

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