METHOD AND DEVICE FOR IMPROVING THE SENSITIVITY AND THE SIGNAL-TO-NOISE RATIO AND PIEZOELECTRIC TRANSDUCERS COMPRISING A MULITIPLICITY OF PARALLEL MOUNTED SENSORS

摘要

ABSTRACT OF THE DISCLOSURE Method and apparatus for improving the sensitivity and the signal-to-noise transducers more piezoelectric sensors interconnected in parallel to the input of an amplifier of electric charges. The method essentially consists in reducing the capacitance of the combination of sensors in parallel to the input of the amplifier, so as to reduce the amplification gain applied to the noise without changing that which is applied to the received signals. This is done by means of an impedance transformer or at least one charge transfer capacitor connected by at least one switch alternately with the sensors and with the capacitor of the amplifier.