公开(公告)号：US06552809B1

公开(公告)日：2003-04-22

申请号：US09664356

申请日：2000-09-18

申请人： Alain Bergeron ,  Michel Doucet ,  Donald Prévost

发明人： Alain Bergeron ,  Michel Doucet ,  Donald Prévost

IPC分类号： G01B1124

CPC分类号： G01D5/38

摘要： A simple optical position encoder of detecting the position of a light spot generated by any light source of either light generating or light reflecting type, directly in a binary or other encoded format at very high speed, comprises a diffractive optical element including an array of diffractive cells each being formed by a unique arrangement of diffractive sub-cells and being disposed at a predetermined position with respect to a predetermined reference point on the diffractive optical element. Each cell is capable of generating a unique optical diffraction pattern when illuminated. When an image of the light spot is formed on the diffractive element, at least one cell is positioned to receive the light spot input image, generating its unique optical diffraction pattern accordingly at an output image plane, where one or more optical detectors are disposed. The detectors are responsive to the unique optical diffraction pattern to generate one or more encoded signals indicative of the position of the light spot image with respect to said reference point. Described applications of the basic embodiment of the position encoder includes absolute three-dimensional position measurement of a light spot formed on a object, position encoding of a light peak generated by an optical processor or correlator and absolute/relative position detection of a light spot generated by or reflected onto an object in a two-dimensional coordinates system.

摘要翻译： 一种简单的光学位置编码器，其以非常高的速度直接以二进制或其他编码格式检测由任意光产生或光反射型的任何光源产生的光点的位置，包括衍射光学元件，其包括衍射阵列 每个单元由衍射子单元的独特布置形成，并且相对于衍射光学元件上的预定参考点设置在预定位置。 每个单元能够在照明时产生独特的光学衍射图案。 当在衍射元件上形成光点的图像时，至少一个单元被定位成接收光斑输入图像，并相应地在输出图像平面处产生其独特的光学衍射图案，其中设置有一个或多个光学检测器。 检测器响应于唯一的光学衍射图案以产生指示光点图像相对于所述参考点的位置的一个或多个编码信号。 位置编码器的基本实施例的描述应用包括在物体上形成的光斑的绝对三维位置测量，由光学处理器或相关器产生的光峰的位置编码和产生的光斑的绝对/相对位置检测 通过或反射到二维坐标系中的物体上。

公开(公告)号：US06570708B1

公开(公告)日：2003-05-27

申请号：US09664355

申请日：2000-09-18

申请人： Alain Bergeron ,  Michel Doucet ,  Donald Prévost

发明人： Alain Bergeron ,  Michel Doucet ,  Donald Prévost

IPC分类号： G02B2746

CPC分类号： G06K9/741 ,  G02B27/46 ,  G02B27/52

摘要： An optical coherent processor or correlator for processing an input image produced by an imaging device illuminated by a coherent light source utilizes an optical key for preventing unauthorized use of the processor. The principle underlying processing apparatus and method according to the invention uses an optical lock in combination with an encoded software key superimposed on a filter image. The optical lock, which is preferably in hardware form, consists of a first optical mask implementing a locking mask function that is preferably complex (phase and/or amplitude), which first optical mask is included in the optical path of the processor. The mask is fixed during assembly of the processor or correlator and a unique pattern is encoded thereon. The software key consists of a pattern defined by a key mask function that is displayed preferably using a spatial light modulator as part of a second optical mask included on the processor optical path. The key mask function is designed to compensate for the wave-front distortion generated by the locking mask function of the first optical mask. Therefore, an optical processor or correlator provided with its unique hardware lock cannot generates useful correlation, unless a corresponding unique software key is used.

摘要翻译： 用于处理由相干光源照明的成像装置产生的输入图像的光学相干处理器或相关器利用光学键来防止未经授权的处理器的使用。 根据本发明的底层处理装置和方法的原理使用光锁与叠加在滤波器图像上的编码软件密钥相结合。 优选地以硬件形式的光学锁定由实现锁定掩模功能的第一光学掩模组成，其优选是复杂的（相位和/或幅度），该第一光学掩模被包括在处理器的光路中。 在处理器或相关器的组装期间，掩模被固定，并且在其上编码唯一的图案。 软件密钥包括由密钥掩码功能定义的图案，其优选地使用空间光调制器作为包括在处理器光路上的第二光掩模的一部分显示。 键屏蔽功能被设计为补偿由第一光掩模的锁屏功能产生的波前失真。 因此，提供其唯一硬件锁定的光学处理器或相关器不能产生有用的相关性，除非使用相应的唯一软件密钥。