Patent ID: 6107881
Filing Date: 2000-08-22
Classification: G01D,G01L,G01N

Abstract:
An electronic circuit serving as an interface between a piezoelectric transducer and a circuit for processing a measuring signal provided by said transducer, said electronic interface circuit serving for providing a constant direct current to said piezoelectric transducer, and for pre-processing an electric signal provided by the transducer via a voltage modulator, said electronic interface circuit being connected to said voltage modulator by a cable having two terminals at each end, the two terminals at a first end of the cable being connected to the output of the voltage modulator and the two terminals at a second end of the cable being connected to said electronic interface circuit, wherein said electronic interface circuit comprises(a) a first direct current source for providing a first constant current to said transducer through an electric current loop;(b) a second direct current source for absorbing a second constant current returning from said transducer to said electronic circuit through said loop while said transducer is supplied with said first current;(c) at least one passive element allowing to absorb the difference between said first constant current and said second constant current.