Loading probe for use in testing transducers

Details Loading probe for use in testing transducers Loading probe for use in testing transducers

1992-06-25

1994-07-12

Williams, Hezron E.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

367 13, H01L 4122

Patent

active

053277716

ABSTRACT:
A loading probe for use in testing transducers includes an elongated body capable of simulating the normal acoustic impedance presented to a transducer to be tested by the medium in which the transducer is to operate. The main body of the loading probe has a tube made from a rigid material, and a rod having an elongated convergent portion extending into the interior of the tube so as to define a cavity which has a varying cross section. The cavity houses a core of material having a close match of acoustic impedance with the material of the tube and rod but a higher acoustic loss factor. The cavity is sealed. The active end of the loading probe carries a piezoelectric element having a planar form, and a protective end cap is bonded to the active end of the loading probe to enclose the piezoelectric element.

REFERENCES:
patent: 4331021 (1982-05-01), Lopez et al.
patent: 4475376 (1984-10-01), Keilman
patent: 4747295 (1988-05-01), Feist et al.
patent: 4838070 (1989-06-01), Bradley
patent: 4959992 (1990-10-01), Gentles

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