17 December 1999 Near-field measurements of vegetation by laser-induced fluorescence imaging
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Abstract
In this paper, a validation of a new UV-A laser-induced fluorescence imaging system implemented in an all-road car for near-field remote sensing of vegetation will be presented. 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 source is a frequency tripled Nd:YAG laser and the laser spot size is adjusted via a variable beam expander. Fluorescence images are recorded at four characteristic fluorescence bands: 440, 520, 690 and 740 nm with a gated intensified digital CCD camera. The laser head and camera are situated on a directed in site and azimuth platform which can be high up to 6 meters. The platform positioning, localization and distance detection, spot size determination and 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 allows also image storage, analysis and treatment. Examples of remote sensing fluorescence images from several plant species recorded at a distance of 10 - 30 m will be given and discussed further in this paper.
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Malgorzata Sowinska, Bernard Cunin, Aline Deruyver, Francine Heisel, Joseph-Albert Miehe, Gabriele Langsdorf, Hartmut K. Lichtenthaler, "Near-field measurements of vegetation by laser-induced fluorescence imaging", Proc. SPIE 3868, Remote Sensing for Earth Science, Ocean, and Sea Ice Applications, (17 December 1999); doi: 10.1117/12.373088; https://doi.org/10.1117/12.373088
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