公开(公告)号：US5452089A

公开(公告)日：1995-09-19

申请号：US94275

申请日：1993-07-05

Applicant: Boyd B. Bushman

Inventor： Boyd B. Bushman

IPC: G01J4/00 ,  G01N21/21 ,  G01N21/35 ,  G02B23/18 ,  G02B26/04 ,  G02B27/28

CPC classification number: G01J4/00 ,  G01N21/21 ,  G02B23/18 ,  G02B26/04 ,  G02B27/28 ,  G06K9/3241 ,  G01J2004/004 ,  G01N2021/1765 ,  G01N21/35

Abstract: A search light employs variable polarization angles to enhance target identification. The search light shines a beam of light which may be directed across terrain. The beam of light is alternated in polarization angles at a rate of about five to twelve cycles per second. The alternating contrast in polarization angles produces flashing to an observer viewing certain targets struck by the beam of light. The flashing appears when striking man-made objects which tend to have a differential in polarized light between horizontal and vertical polarization. Natural objects do not appear to provide the flashing to the observer. The rotating polarization angles are accomplished in one instance by using a stationary polarizer and a liquid crystal retarder mounted in front of a light source. In another instance, the change in polarization angles is accomplished by rotating a polarizer in front of a light source. The light source may be infrared, visible or ultraviolet.

Abstract translation: 搜索光采用可变偏振角来增强目标识别。 搜索光照射可能被引导穿过地形的光束。 光束以约5至12个循环/秒的速率以偏振角交替。 偏振角的交替对比产生了观察者观察到被光束撞击的某些目标的闪烁。 当打击在水平和垂直极化之间有偏振光的差异的人造物体时，会出现闪烁。 自然对象似乎不会向观察者提供闪烁。 通过使用安装在光源前面的静止偏振器和液晶延迟器，一次实现旋转偏振角。 在另一个实例中，偏振角的变化是通过在光源的前方旋转偏振器来实现的。 光源可以是红外线，可见光或紫外线。

公开(公告)号：US5264916A

公开(公告)日：1993-11-23

申请号：US851281

申请日：1992-02-07

Applicant: Boyd B. Bushman

Inventor： Boyd B. Bushman

IPC: G01J4/00 ,  G01N21/21 ,  G01N21/35 ,  G02B23/18 ,  G02B26/04 ,  G02B27/28 ,  G01J1/01

CPC classification number: G01J4/00 ,  G01N21/21 ,  G02B23/18 ,  G02B26/04 ,  G02B27/28 ,  G06K9/3241 ,  G01J2004/004 ,  G01N2021/1765 ,  G01N21/35

Abstract: A device will detect man-made objects by using a polarizer. The polarizer rotates about an axis in front of a lens array. The rotation of the polarizer alternately polarizes light received in proportion to the speed of rotation. This produces flashing in intensity for detecting the object as well as background rejection due to its lack of polarization. A man-made object having both horizontal and vertical surfaces of a type that will reflect light that can be polarized will provide flashing through the lens array as the polarizer passes through horizontal and vertical position. On the other hand, backgrounds don't have polarized components and won't flash. Attention is drawn to the man-made target. The background can also be electronically eliminated from the observed scene, permitting precise lock-on to the target.

Abstract translation: 设备将通过使用偏光片检测人造物体。 偏光镜绕透镜阵列前方的轴旋转。 偏振器的旋转使得与旋转速度成比例地接收的光交替偏振。 由于其缺乏极化，这样会产生用于检测物体的强度闪烁以及背景抑制。 具有水平和垂直表面的人造物体，当反射器通过水平和垂直位置时，具有反射可以被偏振的光的类型将提供通过透镜阵列的闪烁。 另一方面，背景没有偏振分量，不会闪烁。 注意人造目标。 背景也可以从观察到的场景中被电子消除，从而允许对目标的精确锁定。

公开(公告)号：US5404225A

公开(公告)日：1995-04-04

申请号：US093223

申请日：1993-07-14

Applicant: Boyd B. Bushman

Inventor： Boyd B. Bushman

IPC: G01J4/00 ,  G01N21/21 ,  G01N21/35 ,  G02B23/18 ,  G02B26/04 ,  G02B27/28 ,  G02F1/01

CPC classification number: G01J4/00 ,  G01N21/21 ,  G02B23/18 ,  G02B26/04 ,  G02B27/28 ,  G01J2004/004 ,  G01N2021/1765 ,  G01N21/35

Abstract: A device will assist in detecting man-made objects by using a liquid crystal retarder and a stationary polarizer. The liquid crystal retarder shifts impinging light 90 degrees between a nonrotated and a rotated mode. In the nonrotated mode, the retarder is essentially transparent, with the light passing through the retarder and through the polarizer. In the rotated mode, the impinging light will be rotated 90 degrees. An observer viewing the light passing through the polarizer will detect a difference or a flashing, with the rate depending upon the speed of oscillation between the rotated and nonrotated modes. The system can be employed with visible light optical systems such as binoculars, or with an infrared detector or video camera.

Abstract translation: 装置将通过使用液晶延迟器和静止偏振器来辅助检测人造物体。 液晶延迟器在非旋转模式和旋转模式之间偏移90度。 在非旋转模式中，延迟器基本上是透明的，其中光通过延迟器并通过偏振器。 在旋转模式下，入射光将旋转90度。 观察通过偏振器的光的观察者将检测差异或闪烁，其速率取决于旋转和非旋转模式之间的振荡速度。 该系统可用于可见光光学系统如双筒望远镜，或与红外探测器或摄像机。

公开(公告)号：US20180058934A1

公开(公告)日：2018-03-01

申请号：US15321148

申请日：2015-06-26

Applicant: University of Salford Enterprises Limited

Inventor： Tiehan SHEN ,  Paul Joseph COOK

IPC: G01J4/04 ,  G02F1/1335 ,  G02F1/01

CPC classification number: G01J4/04 ,  G01J2004/004 ,  G02F1/0136

Abstract: A method and apparatus are disclosed for measuring polarisation of electromagnetic illumination. The method includes the steps of modulating a polarisation state of illumination received from a target object to generate modulated intensity illumination, selectively measuring an intensity of the modulated intensity illumination by periodically gating an exposure of an imaging device to the modulated intensity illumination at a first gating frequency; responsive to the measured intensity, determining polarisation parameters of the received illumination, and generating image data corresponding to the target object with a plurality of the polarisation parameters, wherein the illumination from the target object is modulated in accordance with a first frequency and the first gating frequency is associated with and synchronised with at least the first frequency.

公开(公告)号：US5345308A

公开(公告)日：1994-09-06

申请号：US947281

申请日：1992-09-17

Applicant: Boyd B. Bushman

Inventor： Boyd B. Bushman

IPC: G01J4/00 ,  G01N21/21 ,  G01N21/35 ,  G02B23/18 ,  G02B26/04 ,  G02B27/28

CPC classification number: G01J4/00 ,  G01N21/21 ,  G02B23/18 ,  G02B26/04 ,  G02B27/28 ,  G06K9/3241 ,  G01J2004/004 ,  G01N2021/1765 ,  G01N21/35

Abstract: A device will detect man-made objects by using a polarizer mounted to a video camera. The polarizer rotates about an axis in front of a lens array of the video camera. The rotation of the polarizer alternately polarizes light received in proportion to the speed of rotation. This produces flashing in intensity for detecting the object as well as background rejection due to its lack of polarization. A man-made object having both horizontal and vertical surfaces of a type that will reflect light that can be polarized will provide flashing through the lens array as the polarizer passes through horizontal and vertical position. On the other hand, backgrounds don't have polarized components and won't flash. Attention is drawn to the man-made target. A high pass filter between the video signal processor and the monitor reduces background from the observed scene, permitting precise lock-on to the target.

Abstract translation: 设备将通过使用安装在摄像机上的偏振片来检测人造物体。 偏振器围绕摄像机的透镜阵列前方的轴旋转。 偏振器的旋转使得与旋转速度成比例地接收的光交替偏振。 由于其缺乏极化，这样会产生用于检测物体的强度的闪烁以及背景抑制。 具有水平和垂直表面的人造物体，当反射器通过水平和垂直位置时，具有反射可以被偏振的光的类型将提供通过透镜阵列的闪烁。 另一方面，背景没有偏振分量，不会闪烁。 注意人造目标。 视频信号处理器和显示器之间的高通滤波器可以从观察到的场景中减少背景，从而可以精确锁定目标。