In this paper, a high-sensitivity lightwave communication system is set up by using a mini-power near-infrared LED as a light emitter, a phototransistor as a photoelectric receiver.
本文采用小功率红外发光管作光源，用光敏二级管作光接收器件，建立了高灵敏度的光波通信系统。
Each unit houses a near-infrared (NIR) LED and monochrome CCD camera sensor, so as the red pigment in blood (hemoglobin) absorbs NIR light, veins appear as dark lines on the resulting image.
手指静脉识别仪包括近红外线LED灯和黑白相机传感器。 近红外LED灯发出近红外射线，当近红外射线穿透手指时，手指静脉的血红蛋白将吸收近红外光，因此，图像中静脉将变为黑色。
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