Apparatus for characterizing ultrasonic medium

Details Apparatus for characterizing ultrasonic medium Apparatus for characterizing ultrasonic medium

1987-02-17

1988-07-19

Chapman, John

Measuring and testing

Vibration

By mechanical waves

73599, 128660, G01N 2900

Patent

active

047577150

ABSTRACT:
The present invention relates to a signal processing apparatus for quantitatively measuring ultrasonic characteristics of a medium, such as a human body and realizes the high speed quantitative measurement by processing all signals in the time domain. In the processing for eliminating an error, produced by a degree of convergence of the ultrasonic beam, a correcting function that is a function of the depth and frequency is employed. The correcting function is measured in a no-attenuation medium and converted into a form suited to the time domain processing. The function is stored and such frequency characteristics of the function are sequentially read during an actual medium measurement to control the characteristic of a variable characteristic filter to correct the received signal.

REFERENCES:
patent: 4016750 (1977-04-01), Green
patent: 4197750 (1980-04-01), Hassler
patent: 4470303 (1984-09-01), O'Donnell
patent: 4509524 (1985-04-01), Miwa

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