Acoustic image recorders

Details Acoustic image recorders Acoustic image recorders

1978-05-18

1979-12-25

Ruehl, Charles A.

Measuring and testing

Vibration

By mechanical waves

G01N 2900

Patent

active

041799364

ABSTRACT:
A method of sensing changes in an object comprising irradiating the object with a focused beam of acoustic radiation excited by a first alternating electric signal; receiving a beam of acoustic radiation modulated in phase and amplitude by the object in the vicinity of the focus and deriving a second alternating electric signal therefrom; providing a reference electric signal derived from the first alternating electric signal and at a known phase; mixing coherently the second signal and the reference signal to derive a first in-phase signal; mixing the second signal with the reference signal altered in phase by between 80.degree. and 100.degree. to provide a first quadrature signal; storing the first in-phase and first quadrature signals; after an interval of time receiving a beam of acoustic radiation modulated by the same part of the object and deriving a third alternating electric signal therefrom and similarly deriving second in-phase and second quadrature signals; and combining the stored first and the second signals so as to sense any change in the object.

REFERENCES:
patent: 3986160 (1976-10-01), Turner
patent: 4012950 (1977-03-01), Kompfner et al.
patent: 4028933 (1977-06-01), Lemons et al.
patent: 4030342 (1977-06-01), Bond et al.

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