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本文介绍的人体探测器基于下述原理:人体本身有相当大的对地电容。如果人体接近一个已知电容器的正极,该电容器的容量将增大。因此,只要找到一种检测这种容量增加的方法,就能探测有无人体存在。本文介绍的人体探测器中,金属传感器和RC振荡电路的小容量定时电容器相连。当有人靠近传感器时,定时电容器的容量增加,RC回路频率下降。这一频率下降经过数字化处理后,用来控制继电器。
This article describes the human body detector based on the following principles: The human body itself has a considerable capacitance to ground. If the human body approaches the positive of a known capacitor, the capacity of the capacitor will increase. So, as long as you find a way to detect this increase in capacity, you can detect the presence or absence of the human body. This article describes the human body detector, the metal sensor and RC oscillator circuit connected to the small-capacity capacitors. As someone approaches the sensor, the capacity of the timing capacitor increases and the RC loop frequency decreases. This frequency drop is digitized and used to control the relay.