这里介绍一种简单、廉价、高灵敏度的金属探测器(图1).使用这种金属探测器能探测到埋入地下15厘米深度的一个壹分硬币.本探测器基于发-收/感应平衡(TR/IB)的原理没计而成的.它由两个电感器(在探头中)、一个可变电感振荡器和一个检测器组成.当被探金属物在探头电感器的周围被感应时,发送线圈与接收线圈之间会产生互感耦合,只要检测出耦合度的变化和振荡器的输出电平的合成变化,即可探知出地下何种金属物来. Here’s a simple, cheap, high-sensitivity metal detector (Figure 1) that uses this metal detector to detect a coin that is buried at a depth of 15 cm below the ground. The detector is based on a send-receive / inductive balance (TR / IB) principle consists of two inductors (in the probe), a variable inductor oscillator and a detector when the probe metal around the probe inductor is Induction, the sending coil and the receiving coil will produce mutual inductive coupling, as long as the change in the coupling and the oscillator output level of the composite changes can be detected from the underground what kind of metal.