Eddy current probe

专利名称：Eddy current probe

发明人：EGNER, HARALD,RUS, ROBERT,ANTHONIO,

PAUL

申请号：EP89109240.5申请日：19890523公开号：EP0343590B1公开日：19931124

摘要：An eddy-current probe having a measuring coil is described, in the magneticfield of which coil the object to be detected is arranged, and having a reference coil aswell as a sine-wave generator, whose output signal is applied to the coil, the outputsignal of which is subtracted by means of a subtractor whose output signal is applieddirectly to a first demodulator and, via a 90 DEG -phase shifter, to a second demodulator,the output signal of the sine-wave generator, shifted via a phase shifter having anadjustable phase angle, being applied to the demodulators as an additional signal, andthe phase angle being chosen such that the interference signals in the compleximpedance plane have a specific direction. …The sensor according to the invention ischaracterised in that the output signal of the first demodulator is applied via an amplifierhaving an adjustable gain (a) and the output signal of the second demodulator is appliedvia an amplifier having an adjustable gain (b) to a further subtractor whose output signal(Utrig) is used, for example via a trigger threshold, as a measure of the object to bedetected.

申请人：FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTENFORSCHUNG E.V.,FRAUNHOFER GES FORSCHUNG,FRAUNHOFER-GESELLSCHAFT ZUR

FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

地址：LEONRODSTRASSE 54; D-80636 MUENCHEN,DE,LEONRODSTRASSE 54; D-80636MUENCHEN

国籍：DE

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