Acoustic examination methods and apparatus

Details Acoustic examination methods and apparatus Acoustic examination methods and apparatus

1976-03-08

1977-03-22

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

73 675H, 340 5H, 340 5MP, G01N 2904

Patent

active

040129519

ABSTRACT:
An acoustic microscope system in which the insonification frequency f.sub.s is continuously modulated, at a rate asynchronous relative to the optical scanning frequencies, to minimize acoustic speckle; the filter means employed to develop a video signal from the scanning beam has its center frequency continuously varied to track the insonification frequency changes. The filter means employs a constant-frequency IF stage, utilizing an IF mixer that subtracts f.sub.s from the initial scanning information but adds a fixed carrier to allow for subsequent effective filtering. A combined deflector and demodulating light shield structure provides for improved alignment of the system optics. For optically opaque specimens, a polished surface of the specimen is used as the acoustic-optic interface, with no coverslip required and both optical and acoustical images derived from a single scanning beam. Shear-mode insonification is employed for improved resolution and to examine special properties of some materials.

REFERENCES:
patent: 3585848 (1971-06-01), Korpel
patent: 3790281 (1974-02-01), Kessler et al.
patent: 3805225 (1974-04-01), Bossaert et al.

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