公开(公告)号：US06462826B1

公开(公告)日：2002-10-08

申请号：US09462981

申请日：2000-03-06

Applicant: John Howard

Inventor： John Howard

IPC: G01B902

CPC classification number: G01J5/04 ,  G01J1/04 ,  G01J1/0429 ,  G01J3/45 ,  G01J3/453 ,  G01J5/0014 ,  G01J5/0018 ,  G01J5/0044 ,  G01J5/08 ,  G01J5/0803 ,  G01J5/0834 ,  G01J5/58 ,  G01J2005/583 ,  G01J2005/586

Abstract: A method and apparatus for measurement of at least one of brightness, flow velocity and temperature of radiant media are provided. A substantially collimated beam of light having a selected frequency is directed to a linear polariser. The linearly polarised output is directed to an electro-optically active birefringent crystal to separate the output into two characteristic waves and to introduce a first fixed phase delay between the characteristic waves. The birefringent crystal is selectively electro-optically modulated to introduce a second variable phase delay between the characteristic waves and the characteristic waves are combined to interfere prior to detection.

Abstract translation: 提供了用于测量辐射介质的亮度，流速和温度中的至少一个的方法和装置。 具有选定频率的基本上准直的光束被引导到线性偏振器。 线性偏振输出被引导到电光学上有效的双折射晶体，以将输出分离成两个特征波并且在特征波之间引入第一固定相位延迟。 双折射晶体被选择性地电光调制以在特征波之间引入第二可变相位延迟，并且特征波被组合以在检测之前被干扰。

公开(公告)号：US4257106A

公开(公告)日：1981-03-17

申请号：US042112

申请日：1979-05-24

Applicant: Siegfried O. Auer

Inventor： Siegfried O. Auer

IPC: G01J5/00 ,  G01J5/58 ,  G01N21/21 ,  G01J4/00

CPC classification number: G01N21/21 ,  G01J2005/0081 ,  G01J2005/586

Abstract: A method of daytime imaging in a range of thermal wavelengths (3-5 microns) which includes specularly reflected solar radiation. Mathematical processing serves to separate the thermal and specular reflection components based on Fresnel's equations which relate the thermal component to three variables: the total radiation intensity; the degree of polarization of the total radiation; and the degree of polarization of the specular reflection component. The first two of these variables may be measured by means of a photometer which is scanned across a target area, and a suitably oriented polarizing filter. The third variable can be calculated as a function of two other quantities: the angle of incidence of sunlight on the target object and the index of refraction of the target object. The first of these two quantities is calculable from time and geographical position data, while the second can be estimated with sufficient accuracy. Each calculation produces a single pixel, and a succession of such pixels is used to build up an image upon a CRT raster which is synchronized with the photometer scan.

Abstract translation: 包括镜面反射太阳辐射在内的一系列热波长（3-5微米）的日间成像方法。 数学处理用于分离基于菲涅尔方程的热和镜面反射分量，其将热分量与三个变量相关：总辐射强度; 总辐射的极化程度; 以及镜面反射分量的偏振度。 这些变量中的前两个可以通过在目标区域上扫描的光度计和适当取向的偏振滤光器来测量。 第三个变量可以作为另外两个量的函数来计算：目标物体上的太阳光的入射角和目标物体的折射率。 这两个数量中的第一个可以从时间和地理位置数据计算，而第二个可以以足够的精度估计。 每个计算产生单个像素，并且使用一系列这样的像素在与光度计扫描同步的CRT光栅上建立图像。