一种基于TN型液晶的自控光阀

An automatic controlled light valve based on twisted nematic liquid crystal

对TN(扭曲向列)型液晶的透光率测量实验表明,在外加电压的作用下TN型液晶可以吸收入射光线,并且在外加电压连续改变时,对入射光的透光率将呈现连续非线性变化。根据此特性,利用数字电路来控制加到液晶电极上的电压,就得到了一种空间光调制器──自控光阀。自控光阀能控制通过光阀的光强,使之趋于设定值。

The measurement for light transmittance of Twisted Nematic (TN) liquid crystal shows that TN liquid crystal can absorb incident light when voltage is applied .The transmittance for incident light will appear continuous nonlinear variation when the applied voltage varies continuously. According to this property, a spatial light modulator Automatic Controlled Light Valve(ACLV) can be obtained when digital circuit is applied to control the voltage applied to liquid crystal electrode The ACLV can control light intensity passing through the light valve and makes it approach to a set value.