Method and apparatus for acoustic scanning using waves scattered

Details Method and apparatus for acoustic scanning using waves scattered Method and apparatus for acoustic scanning using waves scattered

1975-06-20

1977-03-15

Queisser, Richard C.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

310 83, 333 30R, H03H 926

Patent

active

040117472

ABSTRACT:
An acoustic scanning apparatus is described having an acoustic grating for scattering waves into a focused beam. Surface acoustic waves are generated by a chirp signal generator and are introduced along one surface of the scanning apparatus. These waves propagate along the surface, are scattered by the acoustic grating and are thereby converted into bulk acoustic waves. The bulk acoustic waves converge into a focused beam inwardly directed at an angle to the surface acoustic waves. The focused beam scans at substantially the same speed as the surface acoustic waves traveling along the surface of the apparatus. The acoustic grating can also be used to convert bulk waves to surface acoustic waves as either a variable chirp rate generator or a variable pulse compression filter.

REFERENCES:
patent: 2505867 (1950-05-01), Meunier
patent: 3654500 (1972-04-01), Claiborne
patent: 3687219 (1972-08-01), Langlois
patent: 3815409 (1974-06-01), Macovski
patent: 3840824 (1974-10-01), Bertoni et al.
Humphryes et al., Electronics Letters, "Acoustic Bulk Surface Wave Transducer, " vol. 5 No. 9, May 1969, pp. 175-176.

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