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Sensor for non-invasive measurement of sound, pressure and vibration on the human body

  • US 5,035,247 A
  • Filed: 12/29/1988
  • Issued: 07/30/1991
  • Est. Priority Date: 12/31/1987
  • Status: Expired due to Fees
First Claim
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1. A sensor for non-invasive measurement of sound, pressure and vibration on the human body comprising:

  • a sensor cell featuring a probe which can be placed on the surface of said body to sense mechanical input variables;

    a housing providing an enclosure;

    a transducer comprising a piezoelectric foil diaphragm located in said enclosure with the transducer being coupled to said probe and which converts said mechanical input variables into an electrical signal;

    a transmission device connected to said transducer; and

    a signal preamplifier connected via said transmission device to said transducer and which can be connected to a processing unit, said housing having a pressure offset port which is smaller than the wavelength to be received.

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