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1. 发明授权

US4339660A Reflection light barrier apparatus for recognizing both strongly and weakly reflecting objects 失效
标题翻译：用于识别强反射物体的反射光阻挡装置
公开(公告)号：US4339660A
公开(公告)日：1982-07-13
申请号：US150093
申请日：1980-05-15
申请人： Karl-Otto Buchholz , Jurgen Erdmann , Gunter Fetzer
发明人： Karl-Otto Buchholz , Jurgen Erdmann , Gunter Fetzer
IPC分类号： G01S7/499 , G01S17/02 , G01V8/14 , G01V9/04
CPC分类号： G01S7/499 , G01S17/026 , G01V8/14
摘要： A light transmitter directs light via a first polarizing filter, so that it is polarized in one plane, to a retro-reflecting device across a region to be monitored and the retro-reflector produces depolarization, or rotates the plane of polarization of the light, prior to directing it to a light receiver positioned adjacent the light transmitter. A second polarizing filter crossed relative to the first is positioned in front of the light receiver so that the light receiver will only recognize light whose plane of polarization has been appropriately rotated by the retro-reflector but not light reflected from a strongly reflecting object which interrupts the light barrier. Threshold circuitry evaluates whether a signal from a photoelectric convertor embodied in the receiver lies above or below a given threshold. Weakly reflecting objects are not recognized, because light reflected therefrom will be too weak to generate a signal above the required threshold. Various polarizing arrangements are described.
摘要翻译：光发射器经由第一偏振滤光器引导光，使得其在一个平面中被偏振到待监视的区域上的回射装置，并且后向反射器产生去极化，或者使光的偏振平面旋转，之后将其引导到位于光发射器附近的光接收器。相对于第一偏振滤波器交叉的第二偏振滤光器位于光接收器的前面，使得光接收器将仅识别其平面偏振已被后向反射器适当旋转的光，但不识别从强反射物体反射的光，其中断光屏障。阈值电路评估来自接收机中实现的光电转换器的信号是否高于或低于给定阈值。弱反射物体无法识别，因为反射的光将太弱，无法产生高于所需阈值的信号。描述各种偏振装置。

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