New UV-A laser-induced fluorescence imaging system for near-field remote sensing of vegetation: characteristics and performance
New UV-A laser-induced fluorescence imaging system for near-field remote sensing of vegetation: characteristics and performance
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用于植被近场遥感的新型UV-A激光诱导荧光成像系统：特性和性能
DOI：
10.1117/12.351333
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
J. Miehé
中科院分区：
文献类型：
--
作者：
M. Sowinska;B. Cunin;F. Heisel;J. Miehé
在本文中，一个紧凑的，新的UV-A激光诱导荧光成像系统中实现的全公路车近场遥感植被将被描述。它是作为欧洲共同体计划INTERREG II* 的一部分开发的，由三个主要部分组成：激励，检测和控制单元。激发光脉冲（10 ns）由三倍频Nd：YAG激光器产生，该激光器以高达约等于22 kHz的可变重复率在355 nm处发射，并且脉冲能量通常为40 μ J。激光光斑尺寸通过可变扩束器进行调节。荧光图像通过入口透镜和10 nm带通滤波器用以每秒50帧操作的门控增强数字CCD照相机记录。系统的“头部”（激光器和摄像机）可以在现场和方位定向，并且可以高达6米。所有功能，如系统定位、定位和距离检测、光斑尺寸调整、聚焦、锐度、滤波器选择、激光器和相机同步、增强器增益、图像的真实的实时可视化、采集时间，均由新开发的软件控制，该软件还允许图像存储、分析和处理。遥感荧光图像记录在10和30米之间的距离的例子。
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.