Sensor comprising a piezoelectric detector with compensation for ground faults
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United States of America Patent
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Dec 22, 2015
Grant Date -
Oct 17, 2013
app pub date -
Dec 20, 2011
filing date -
Dec 21, 2010
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Abstract
A sensor includes a piezoelectric detector (10) mounted in a support having electrically conductive walls forming a mechanical ground (MM), and an amplifier for processing the signal delivered by the piezoelectric detector, defining an electronic ground (ME) and at least a capacitive feedback loop (16). A voltage adder circuit (61) is inserted into the capacitive feedback loop in order to add an electrical voltage which varies as a function of the potential difference between the mechanical ground (MM) and the electronic ground (ME), so that the variations of this potential difference are continuously compensated for at the input (13) of the processing amplifier (12) receiving the signal delivered by the piezoelectric detector (10).
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