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1. 发明申请

WO1997045711A1 METHOD AND APPARATUS FOR MONITORING THE STATE OF A LIQUID-CRYSTAL POLARIZATION MODULATOR 审中-公开
标题翻译：用于监测液晶极化调制器状态的方法和装置
公开(公告)号：WO1997045711A1
公开(公告)日：1997-12-04
申请号：PCT/US1997008820
申请日：1997-05-27
申请人： BELL COMMUNICATIONS RESEARCH, INC.
发明人： BELL COMMUNICATIONS RESEARCH, INC. , TOMILSON, W., John, III , WAGNER, Richard, E.
IPC分类号： G01J04/00
CPC分类号： G02F1/31 , G01J4/04
摘要： A liquid crystal (LC) polarization modulator segment (216, 218) includes a monitoring device (220). The monitoring device (220) includes a polarized reference light source (222), located at an LC polarization monitor input, and polarized light detector (224), located at an LC polarization monitor output. If the reference light having the correct polarization is received at the detector (224), an indication of the switch state is provided. Alternatively, if the polarized detector (224) includes orthogonal polarizers (230A, 230B) provided for two separate light detectors (232A, 232B) both the desired polarization, and the opposite polarization, may be monitored to determine whether a failure exists in the segment. If the reference light is detected having the opposite polarization (instead of or in addition to the correct polarization) or no light is detected, the segment (or the monitor) is not operating correctly.
摘要翻译：液晶（LC）偏振调制器段（216,218）包括监视装置（220）。监视装置（220）包括位于LC偏振监视器输入处的偏振参考光源（222）和位于LC偏振监视器输出处的偏振光检测器（224）。如果在检测器（224）处接收到具有正确极化的参考光，则提供开关状态的指示。或者，如果偏振检测器（224）包括为两个单独的光检测器（232A，232B）提供的正交偏振器（230A，230B），则可以监视期望的极化和相反极化，以确定是否存在该段中的故障。如果检测到参考光具有相反的偏振（代替或除正确的偏振之外）或没有检测到光，则该段（或监视器）不能正确地操作。

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