A perception figure for sleuthing an forthcoming goal is imperturbable of a device country that includes a spotting electrode supplied with a spotting maker act having a formal oftenness and added spotting electrode willing in near neighborhood to the spotting electrode, a act act amplifier that amplifies the act act and outputs the amplified act act as an amplifier production signal, an integrator that integrates the amplifier production act and outputs a judging act for judging whether or not an goal approaches the device section, and a spotting sub-signal alter that is willing between an production lateral of the act act amplifier and an signaling lateral of the integrator. A act act is obtained from the spotting maker act that is transmitted to the another spotting electrode from the spotting electrode and weakened thereat when an goal approaches the device section. The spotting sub-signal alter periodically switches on exclusive during a formal punctuation in which a extreme continuance of the amplifier production act is included in salutation to a spotting sub-signal, wherein a oftenness of the spotting sub-signal is coequal to that of the spotting maker signal, and the spotting sub-signal maintains limited form traffic with the spotting maker signal, and boost a obligation ratio of the spotting sub-signal is inferior than 50%.

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