Micromachined ultrasonic leaky wave air transducers

Details Micromachined ultrasonic leaky wave air transducers Micromachined ultrasonic leaky wave air transducers

1997-04-23

2000-06-06

Chapman, John E.

Measuring and testing

Vibration

By mechanical waves

73632, G01N 2924

Patent

active

060704683

ABSTRACT:
A method is disclosed for selecting characteristics (i.e. thickness-frequency product, length and material) of leakage plates used in ultrasonic transducers that transfer ultrasonic energy via leakage to fluid media with low acoustic impedances. High leakage efficiency and wide bandwidths are achieved by exciting the low order antisymmetric Lamb wave mode (A0) at the selected frequency in the leakage plate. Various actuator configurations that can be used to excite and detect the A0 mode in the leakage plate are described. Some embodiments employ reflector structures to intercept the leaky waves and reform them into beams normal to the plane of the leakage plate.

REFERENCES:
patent: 4838127 (1989-06-01), Herremans et al.
patent: 5003822 (1991-04-01), Joshi
patent: 5115414 (1992-05-01), Atalar et al.
patent: 5129262 (1992-07-01), White et al.
patent: 5159838 (1992-11-01), Lynnworth

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