The MK II Fraunhofer Line Discriminator (FLD-II) for Airborne and Orbital Remote Sensing of Solar-Stimulated Luminescence
The MK II Fraunhofer Line Discriminator (FLD-II) for Airborne and Orbital Remote Sensing of Solar-Stimulated Luminescence
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DOI：
10.1117/12.7971842
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发表时间：
1975-08
影响因子：
1.3
通讯作者：
J. A. Plascyk
中科院分区：
文献类型：
--
作者：
J. A. Plascyk
FLD-11是一种计算光度计，可确定并显示其视野内场景的发光和反射系数的实时值。它通过将接收到的能量的光谱带宽限制在夫琅和费线的光谱半带宽（太阳光谱中的吸收特征）来感测发光。固体Fabry-Perot滤波器感兴趣的夫琅和费线通常非常窄（小于0.1 nm），并且从连续谱的强度明显降低。FLD-II可以从直升机或固定翼飞机上操作。该仪器的灵敏度允许在589.0-nm夫琅和费线处检测<0.3 ppb的罗丹明WT染料的发光。FLD-II可实现以下功能：（1）远距离跟踪荧光染料，用于研究大型水体中的水流和扩散速率;（2）探测石油溢漏和泄漏;（3）探测受胁迫植物体内叶绿素的发光，以确定土壤中的地球化学异常和作物病害的发生;和（4）检测和监测显示固有发光的污染物，例如来自磷酸盐加工厂的流出物、含有发光增白剂的洗衣洗涤剂、木质素磺酸盐（纸浆厂流出物废物）等。本文详细介绍了机载FLD（光学系统）和它的扩展到轨道成像系统与地球资源研究的应用。
The FLD-ll is a computing photometer that determines and displays real-time values of the luminescence and reflectance coefficients of scenes within its field of view. It senses luminescence by limiting the spectral bandwidth of the received energy to the spectral half-bandwidth of a Fraunhofer line-an absorption feature in the solar spectrum-by means of a. solidetalon Fabry-Perot filter. The Fraunhofer lines of interest are generally very narrow (less than 0.1 nm) and are appreciably reduced in intensity from the continuum. The FLD-II can operate from either helicopter or fixed-wing air-craft. The sensitivity of the instrument permits detection of the luminescence of <0.3 ppb of rhodamine WT dye at the 589.0-nm Fraunhofer line. The FLD-II can perform the fol-lowing functions: (1) remote tracking of fluorescent dyes for the study of current flow and rate of dispersion in large bodies of water; (2) detection of oil spills and leaks; (3) de-tection of the luminescence of in vivo chlorophyll of stressed vegetation in order to identify geochemical anomalies in the soil and the onset of crop disease; and (4) detection and mon itoring of pollutants that exhibit an inherent luminescence, such as effluents from phosphate processing plants, laundry detergents containing luminescent brighteners, lignin sulfo nate (a pulp mill effluent waste product), and others. This paper presents both details of the airborne FLD (optical system) and it's extension to an orbiting imaging system with applications to earth resources studies.