公开(公告)号：US4398822A

公开(公告)日：1983-08-16

申请号：US327301

申请日：1981-12-03

Applicant: Harry L. Task

Inventor： Harry L. Task

IPC: G01B11/26 ,  G01N21/41 ,  G01N21/88

CPC classification number: G01B11/26 ,  G01N21/41 ,  G01N2021/9586

Abstract: An improved system for measuring absolute angular deviation through transparencies, such as aircraft windscreens, uses an incoherent light source and a target configuration in the form of an opaque slide with a transparent "L"-shaped pattern. The positions of images of the legs of the "L" after passing through the transparency are detected at separate times by a single CCD array through rotation of the image of the "L"-shaped pattern ninety degrees by rotation of a Pechan prism about the optical axis of the system. In such manner, horizontal (azimuth) and vertical (elevation) components of angular deviations is measured for each tested point on the transparency, uncontaminated by lateral displacement errors.

Abstract translation: 用于测量通过透明度的绝对角度偏差的改进的系统，例如飞机挡风玻璃，使用非相干光源和具有透明“L”形图案的不透明滑块形式的目标配置。 在通过透明度之后“L”的腿的图像的位置通过单个CCD阵列在单独的时间被检测，通过使Pechan棱镜围绕着“L”形图案的旋转旋转90度的图像 系统的光轴。 以这种方式，对透明度上的每个测试点测量角度偏差的水平（方位角）和垂直（高度）分量，不受侧向位移误差的污染。

公开(公告)号：US4299451A

公开(公告)日：1981-11-10

申请号：US144465

申请日：1980-04-15

Applicant: Harry L. Task ,  Gilbert G. Kuperman

Inventor： Harry L. Task ,  Gilbert G. Kuperman

IPC: G02B27/28 ,  G02B27/18 ,  G02F1/01 ,  G03B21/00 ,  G03B27/72

CPC classification number: G02B27/28

Abstract: An apparatus for creating images of nonperiodic patterns, which patterns are variable in contrast with respect to a uniform and constant level of background luminance. Two beams of uniform luminance are projected through individual, orthogonally oriented linear polarizers, and then into a common cube beam splitter to be divided and interlaced. One combined output beam from the splitter is projected through a rotatable linear polarizer onto the image sensing optical detector undergoing test. The second beam is projected toward a detection system. The patterned region of the second beam passes through a second rotatable linear polarizer, synchronized to the first rotatable polarizer, and onto a CCD array detector system. Contrast between the pattern and the background is represented by the two electrical voltage levels in the array output, irrespective of the spatial frequencies in the pattern. Two unpatterned background regions from either of the interlaced beams are projected through individual and orthogonal linears polarizers to individual luminance detectors. Each detector, in turn, regulates its corresponding beam intensity to compensate for drift in the beam generating elements.

Abstract translation: 用于创建非周期性图案的图像的装置，相对于均匀且恒定的背景亮度水平，这些图案是可变的。 两个均匀亮度的光束通过单独的正交取向的线性偏振器投影，然后投射到共同的立方分束器中进行分割和隔行扫描。 来自分离器的一个组合的输出光束通过可旋转的线性偏振器投影到经过测试的图像感测光学检测器上。 第二个光束被投射到检测系统。 第二光束的图案化区域通过与第一可旋转偏振器同步的第二可旋转线性偏振器，并且到达CCD阵列检测器系统。 图案与背景之间的对比由阵列输出中的两个电压电平表示，与图案中的空间频率无关。 来自任一个隔行横梁的两个未图案化的背景区域通过单独和正交的线性偏振器投射到各个亮度检测器。 每个检测器又调整其相应的光束强度以补偿光束产生元件中的漂移。