公开(公告)号：US3641344A

公开(公告)日：1972-02-08

申请号：US3641344D

申请日：1969-04-01

Applicant: PERKIN ELMER CORP

Inventor： MARKLE DAVID A

IPC: G01J3/44 ,  G01J3/457 ,  G01N21/64 ,  G01N21/34

CPC classification number: G01J3/457 ,  G01J3/4406 ,  G01N21/6456 ,  G01N2021/1793 ,  G01N2201/0616

Abstract: A method and apparatus for determining the presence, location and relative concentration of certain fluorescent materials in a scene that is illuminated by sunlight. The particular fluorescent materials are characterized in that they fluoresce at wavelengths coincident with one or more Fraunhofer absorption bands. Two images are formed from light collected from the scene. One of the images consists mainly of light from the scene having a spectral band-pass inside a Fraunhofer absorption band and the other image consists mainly of light from the scene having a spectral bandpass in the continuum near the same Fraunhofer absorption band. The two images are normalized so that intensities on corresponding portions of each image due to reflected solar radiation are equal. The ''''continuum'''' image is then subtracted from the ''''Fraunhofer'''' image. The resulting difference image consists primarily of fluorescent radiation derived from the fluorescent materials or objects in the scene and provides a direct visual indication of their presence, location and relative concentration.

Abstract translation: 一种用于确定由阳光照射的场景中某些荧光材料的存在，位置和相对浓度的方法和装置。 特定的荧光材料的特征在于它们在与一个或多个Fraunhofer吸收带一致的波长处发荧光。 从场景收集的光形成两个图像。 其中一幅图像主要由来自Fraunhofer吸收带内具有光谱带通的场景的光组成，另一幅图像主要由来自相同弗劳恩霍夫吸收带附近的连续谱中具有光谱带通的场景的光组成。 两个图像被归一化，使得由于反射的太阳辐射引起的每个图像的对应部分上的强度相等。 然后从“Fraunhofer”图像中减去“连续体”图像。 所得到的差异图像主要由来自场景中的荧光材料或物体的荧光辐射组成，并提供其存在，位置和相对浓度的直接视觉指示。

公开(公告)号：US3598994A

公开(公告)日：1971-08-10

申请号：US3598994D

申请日：1968-09-19

Applicant: PERKIN ELMER CORP

Inventor： MARKLE DAVID A

IPC: G01N21/64 ,  G01N21/22

CPC classification number: G01N21/645 ,  G01N2021/6426 ,  G01N2201/0616

Abstract: A method and apparatus for sensing fluorescent radiation emitted by a sample material using sunlight as the source of exciting radiation. A bundle of direct sunlight is encoded and split into beams each of which is combined with similar portions of a bundle of light containing solar reflected and solar-excited fluorescent energy components from the sample material. The sample bundle is encoded differently from the direct sunlight or reference bundle so that it may be distinguished subsequently. The two beams (each of which contain reference and sample components) are passed through two spectral filters and detected photoelectrically. One of the spectral filters is centered on a Fraunhofer absorption line. The other filter is centered a few Angstroms away in the solar continuum. The four signals corresponding to the intensity of the sample and reference beam components passing through each of the two spectral filters are separated electronically and combined in an analogue computer to yield a signal proportional to the fluorescivity of the sample material.