A proximity switch based on InSb magnetic sensor and its signal processing circuit were designed. The properties of the proximity switch of different radial-distances were discussed. Relations between radial-distance and action-distance, radial-distance and replacement-distance,radial-distance and path-difference were analyzed respectively. Experiment results show the proximity switch has favorable dynamic properties when the range of radial-distances is from 4 mm to 7mm. The performance of proximity switch is the best when the radial-distance is 4 mm. Its action-distance can reach 8. 14 mm, the hysteresis-distance and the repeating location accuracy are smaller than 0. 05 mm and 0. 04 mm respectively.%设计了基于锑化铟磁敏传感器的接近开关和信号处理电路,并对不同径向间距下接近开关性能进行了研究,分别分析了动作距离、复位距离以及差程与径向间距的关系.实验结果表明:径向间距为3 ～7 mm时,接近开关的动态性能良好,径向间距为4 mm时,接近开关性能最佳,动作距离高达8.14 mm,回差距离小于0.05 mm,重复定位精度小于0.04 mm.
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