| 摘要 |
A device for detecting the passage of at least one mobile body in at least one location fixed by its travel along a path inside of a space in reference to which the said travel of the mobile body is evaluated. It is characterized in that the double reception circuit (29) which includes the responder, consists of two elements (20, 21) which, when the mobile body passes the monitoring location, generate two signals (31, 32) of an appreciably equivalent nature, and in that these elements (20, 21) are designed and connected with each other in such a way as to give opposite values to at least one of the characteristics of these signals (31, 32) which, when combined, form at least one resulting signal (R), at least one of the characteristics of which, at least at one fixed location (13) of the passage of the transmitter at right angles to the responder, changes in an abrupt fashion in accordance with a discernible amplitude variation from possible other variations of the characteristics considered in connection with the said resulting signal (R) and thus constitutes a particularly electric phenomenon hereinafter called top which, in the resulting signal (R), defines two distinct portions, each one of a certain length.
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