近红外传感器在汽车改造技术中的应用研究

利用反射式近红外传感器及语音录放组件，研究了汽车倒车防撞语音提示器。当汽车倒车时，只要距车身后尾一定的距离内有人或物体存在，就会有一部分红外光信号经人或物体反射回来，被与发射管同排安装的光敏接收管收到并转换成同频率的电信号后，由模块内部电路进行放大、解调、整形、比较处理后，在输出端输出控制信号，控制语音录放组件工作，告诉司机车后有人、车后有物体。由于近红外线传感器、语音录放组件均为一体化结构，成本低、接线简单、抗震能力强、测量准确、工作稳定可靠，适合在汽车上安装使用。

Application of Near Infrared Sensor to the Technology of Automobile Transformation

Using reflective near infrared sensor and voice record-reproducing assembly, the present article studies the voice anticollision-prompting device for backing an automobile. If there is a man or an object within a certain distance behind the backing automobile, part of the infrared signal will be reflected by the man or the object, and received by the photosensitive tube installed with a transmitting tube, and transformed to a similar frequency electric signal. The electric signal will be amplified, demodulated, and shaped by the circuit of module. After comparing and processing, the control signal will be output, which controls the work of voice record-reproducing assembly, and reminds the driver that there is a man or an object behind the backing automobile. With both the near infrared sensor and voice record-reproducing assembly being integrated, the distance-warning device has the advantages of low costs, simple wiring, strong anti-detonation ability, precise measuring, and working stability. It is suitable for being installed and used on the automobile.