A proximity switch based on InSb magnetoresistance was designed. The construction of InSb magnetor-esistance and the working principle of the proximity switch were introduced. The signal processing circuit of the proximity switch was also designed. The dynamic characteristic experiment shows that when the radial distance is 4 millimeter, the action-distance of is more than 8 millimeter, the hysteresis-distance is less than 0.06 millimeter and the repeating location accuracy is smaller than 0.04 millimeter. The proximity switch has favorable dynamic characteristics, high sensitivity,simple construction and low cost,and is easy to install. It can be mass-produced, used for ferromagnetic substance detecting in industrial fields.%设计了一种基于锑化铟磁敏电阻的接近开关,介绍了锑化铟磁敏电阻结构及接近开关工作原理,并设计了接近开关信号处理电路.动态特性实验结果表明:径向间距为4 mm时,接近开关动作距离大于8mm,回差距离小于0.06 mm,重复定位精度小于0.04 mm.该接近开关具有良好的动态特性,其灵敏度高,易安装且结构简单,成本低,可以实现规模化生产,用于工业领域的铁物质检测.
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