Acoustic imaging system and method

Details Acoustic imaging system and method Acoustic imaging system and method

1982-11-17

1985-05-21

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358174, 73606, 367 7, H04N 530

Patent

active

045189927

ABSTRACT:
An acoustic microscope or like acoustic imaging system includes an insonifier for insonifying an object with high frequency (over ten megahertz) acoustic waves, a scanner for scanning a high-energy light beam across a reflective interface surface coupled to the object, a photodetector to detect the reflected beam, and a signal processor to convert the photodetector output to an image signal used to produce a visual image representative of acoustic properties of the object; the level of the image signal is detected and is used to adjust the gain of the insonifier to a reference level, the insonification gain adjustment affording a quantitative measure of acoustic properties of the object, usable for comparison purposes, that minimizes or eliminates the effects of system non-linearities and compensates for inadequate dynamic range of system components. The quantitative measurement can be limited to a portion of the object, for comparison with another part of the same object or with a part of another object, and the portions of the image corresponding to the quantitative measurements can be visually identified. An optical AGC circuit is provided to compensate for non-uniformity in operation of the optical scanner and photodetector.

REFERENCES:
patent: 3585848 (1971-06-01), Korpel
patent: 3590681 (1971-07-01), Cross
patent: 3611277 (1971-10-01), Yoder
patent: 3622791 (1971-11-01), Bernard
patent: 3790281 (1974-02-01), Kessler et al.
patent: 3903497 (1975-09-01), Stimler et al.
patent: 3937066 (1976-02-01), Green et al.
patent: 4012951 (1977-03-01), Kessler

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