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文章根据金属切割磁力线引起电压变化的原理 ,设计研制了一种金属探测仪。基于被检测信号具有较大动态范围的特点 ,系统采用了单片机、A/D转换器、D/A转换器组成的三段程控放大器以达到动态调整量程的目的。
According to the principle of voltage change caused by metal cutting magnetic line, a metal detector is designed and developed. Based on the characteristics of the detected signal with a large dynamic range, the system uses a three-stage programmable amplifier composed of a singlechip, an A / D converter and a D / A converter to achieve the purpose of dynamically adjusting the range.