介绍了基于单片机控制的智能型金属探测器。采用灵敏度极高的线性霍尔元件作为传感器，感应由于金属出现引起的探测线圈周围磁场的变化，提高了检测精度。采用AT89S52单片机作为检测和控制核心，对检测结果进行分析判断，有效地保证了检测的实施。利用软件滤波的方法代替了传统探测器复杂的模拟电路器件，大大提高了系统的可靠性、灵敏度和抗干扰性。研究结果表明，该金属探测系统可以有效检测金属是否存在。%An intelligent metal detecting system is designed in this paper. The system adopts high-sensitivity linear Hall element as sensor to sense the changes of magnetic fi eld around the metal detection coil due to appearance of certain metal for improving the detection accuracy.AT89S52 microcontroller is used as the core for detection and control to complete the analyses and judgments of results, which ensures the implementation of the detection effectively. The softwarefi ltering method is applied instead of the traditional complex analog circuit devices, which improves system reliability, sensitivity and resistance interference greatly. The results show that the metal detecting system can detect existence of metal effectively.
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