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在实验的基础上,深入研究了TN型液晶光阀的原理和光学特性。发现TN型液晶光阀对红外波段和可见光波段所产生的不同透射和截止效应都取决于光阀的偏振片。分析了液晶光阀的视角和波谱透过率等因素对图像火灾探测的影响,并指出了在利用液晶光阀做光开关的火灾探测系统中应该注意的问题。
On the basis of experiments, the principle and optical characteristics of TN liquid crystal light valve are deeply studied. It is found that the TN-type liquid crystal light valve has different transmission and blocking effects on the infrared and visible wavebands depending on the polarizer of the light valve. The influence of the viewing angle of the liquid crystal light valve and the spectral transmittance on the image fire detection is analyzed. At the same time, the problems that should be paid attention to in the fire detection system using the light valve of the liquid crystal light valve as an optical switch are pointed out.