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实验发现，液晶片在不透光状态下仍能透过红外光；正常使用条件下的黑白ＣＣＤ摄像机对近红外光也有响应。将液晶片放置在摄像机前就能获得具有强烈近红外光的火焰图像，通过对红外图像的处理，即可识别真假火灾，达到火灾探测的目的。
It was found through experiments that the liquid crystal film can still transmit infrared light under the state of no light transmission; the black-and-white CCD camera under normal use conditions also responds to near-infrared light. Before placing the liquid crystal film in the camera, a flame image with strong near-infrared light can be obtained. By processing the infrared image, true and false fires can be identified to achieve the purpose of fire detection.