Method and means for determining ultrasonic wave attenuation in

Details Method and means for determining ultrasonic wave attenuation in Method and means for determining ultrasonic wave attenuation in

1982-04-19

1984-04-10

Howell, Kyle L.

Measuring and testing

Vibration

By mechanical waves

128660, A61B 1000

Patent

active

044413688

ABSTRACT:
Ultrasonic wave attenuation in an object is determined from the number of zero crossings of a reflected signal as a function of depth. The zero crossing density is indicative of the frequency spectrum, and by comparing the zero crossing density at one level to the zero crossing density at a second level a measure of attenuation therebetween is obtained. Apparatus for implementing the method comprises a zero crossing detector such as a Schmitt triggered monostable multivibrator and a pulse counter.

REFERENCES:
patent: 3896788 (1975-07-01), Sato
patent: 4254779 (1981-03-01), Miyato et al.
Cohen, B. A. et al., "Stationority of the Human Electroencephalogram", MBEC vol. 15, 1977, pp. 513-518.

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