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本文介绍混合场效应液晶光阀和它在实时相干光学数据处理方面的应用。光阀基本上是一个高分辨率的光学对光学的图象转换器。该器件包括碲化镉光吸收层,介质反射镜和在玻璃板上沉积铟锡氧化物透明电极之间分层的联苯基液晶层。为降低光电导体的阻抗,图象直接输入到光电导体上,在液晶电极上加上交流开关电压以激发器件。交流工作确保器件有较长的工作寿命。液晶以混合场效应方式工作。它利用扭转向列效应产生暗的截止态(没有电压加在晶体上),利用光的双折射产生亮的导通态。液晶调制相干读出光的相位。用外加的解偏器产生光强调制。光阀的性能可通过以下几方面的测量来说明:调制传递函数、分辨率、响应时间,灵敏度和光学质量,最后介绍了液晶光阀的应用,包括非相干到相干的转换、实时相关、雷达信号处理和实际景物感测。
This article describes the mixed field effect liquid crystal light valve and its application in real-time coherent optical data processing. The light valve is basically a high-resolution optical-to-optical image converter. The device includes a cadmium telluride light absorbing layer, a dielectric mirror, and a biphenyl liquid crystal layer layered between indium tin oxide transparent electrodes deposited on a glass plate. In order to reduce the impedance of the photoconductor, the image is directly input to the photoconductor, and the AC switch voltage is applied to the liquid crystal electrode to excite the device. Communication work to ensure that the device has a longer working life. LCD works in mixed field mode. It uses a twisted nematic effect to produce a dark off state (no voltage is applied to the crystal) and uses light birefringence to create a bright on state. LCD modulation coherent readout light phase. Extrapolators are used to generate light intensity modulation. Light valve performance can be measured by the following aspects to illustrate: Modulation transfer function, resolution, response time, sensitivity and optical quality, and finally introduced the application of liquid crystal light valve, including incoherent to coherent conversion, real-time correlation, radar Signal Processing and Real Scene Sensing.