Measuring and testing – Vibration – By mechanical waves
Patent
1990-01-18
1992-07-14
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
310313R, G01N 924
Patent
active
051292629
ABSTRACT:
An ultrasonic sensor which has a thin planar sheet of material forming a Lamb wave propagation medium, the sheet having a thickness which is no greater than about twenty microns. The sensor also includes a Lamb wave generator for generating Lamb waves in the propagation medium and an output device for producing an electrical signal representative of the propagation characteristics of the Lamb waves propagating along the propagation medium. A measuring device is included in the sensor to measure selected characteristics of the output electrical signal. The propagation medium has some physical characteristics that are determined by the value of a measurand acting on the medium and the determined physical characteristics determine the propagation characteristics of the Lamb waves which are propagated along the medium. When the sensor is acted on by a measurand to determine the physical characteristics of the propagation medium, the characteristics of the electrical signal are also determined. The measuring device measures the electrical signal and provides an indication of the measurand value. Several sensing arrangements are also disclosed as well as methods for making the planar propagation medium.
REFERENCES:
patent: 4404852 (1983-09-01), Goto
patent: 4598224 (1986-07-01), Ballato
Ultrasonic Transducers by J. de Klerk, Ultrasonics, vol. 9, No. 1, Jan. 1971, pp. 35-48.
Wenzel Stuart W.
White Richard M.
Arana Louis M.
Regents of the University of California
Williams Hezron E.
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