Sensor for non-invasive measurement of sound, pressure and vibration on the human body
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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Abstract
The invention relates to a sensor (1) for non-invasive measurement of sound, pressure and vibration on the human body which features a transducer in the form of a transducer membrane (23) to achieve a very good response characteristic coupled with low weight and small size. The transducer diaphragm (23) is preferably configured as a piezoelectric foil which converts the mechanical input variables into electrical signals which can be processed by means of processor units.
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Citations
19 Claims
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1. A sensor for non-invasive measurement of sound, pressure and vibration on the human body comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification