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INDUCTIVE LOOP DETECTINGS SYSTEM AND THE PROCESS FOR THE APPLICATION THEREOF
INDUCTIVE LOOP DETECTINGS SYSTEM AND THE PROCESS FOR THE APPLICATION THEREOF
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机译:感应圈检测系统及其应用过程
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摘要
An eddy-current loop detector operates to sense the presence of an electrically conductive object by applying D.C. onto a conducting loop so that a permanent magnetic field is induced, which field partly penetrates into the object; ensuring the quick cessation of self-inductive transient operation of the loop when the D.C. is switched off; and measuring the change in the part of the flux passing through the measuring loop arising from eddy-currents induced in the conductive object, and evaluating such change while the relatively slowly decreasing flux is maintained. By repeating these operations with the desired frequency, the eddy-current detector is well suited for continuous measuring of the position of the object.
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