Combined force, strain and sound emission transducer
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United States of America Patent
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Jun 11, 1996
Grant Date -
N/A
app pub date -
May 14, 1993
filing date -
May 15, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a combined force, strain and sound emission transducer and a coupling method. The sound emission sensor (1) forms an assembly unit and is intended specially for measuring high-frequency sound emissions (up to around 2 MHz). It consists of a piezoelectric measuring element (9), an assembly base (8) with circumferential coupling diaphragm (7), and an encapsulant (10) partly surrounding the measuring element (9) and partially the assembly base. The assembly unit could contain also a resistor (11) paralleling the measuring element (9) and forming a high-pass filter with the capacitance of the sensor (1). The coupling diaphragm (7) lies in a recess (14) of the housing bottom (4), whose bottom surface (5) is at a distance from the measuring object (15) corresponding to the prestressing distance s when the diaphragm (7) is unloaded. Coupling the sound emission sensor (1) to the measuring object (15) is achieved so that the bottom surface (5) is pressed onto the measuring object (15 ) and fixed thereto, whereby the diaphragm (7) is loaded and the assembly base (8) is coupled to the surface of the measuring object (15). The invention makes possible miniaturization and more rational production of the transducer as well as improving high-frequency transmission.
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