This article introduces all the transducers which can be used to measure distance, and compares their abilities to measure the underground metal. We get the right transducer and look forward to the future.%介绍了目前所有可进行距离测量的传感器,从探测地下金属距离的角度出发,进行比较说明,指出其优缺点.得出可用传感器后,对综合性探测提出展望.
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