Phase insensitive detector for use in ultrasonic scanner and met

Details Phase insensitive detector for use in ultrasonic scanner and met Phase insensitive detector for use in ultrasonic scanner and met

1983-05-13

1984-12-18

Gill, James J.

Measuring and testing

Vibration

By mechanical waves

73625, G01N 2904

Patent

active

044884346

ABSTRACT:
Improved B-scan images are obtained in an ultrasonic scanner by means of a phase insensitive imaging system. Backscattered signals are detected by a phased array of detector elements. Signals from each detector element are full wave rectified, low pass filtered and are nonlinearly processed by power law compression. The compressed signals are summed and then expanded by an inverse power law function.

REFERENCES:
patent: 3805596 (1974-04-01), Klahr
patent: 4325257 (1982-04-01), Kino et al.
"Response Characteristics of a Finite Aperture . . . " by Busse & Miller from J. Acoustical Soc. of America, 70(5) Nov. 1981, pp. 1370-1376.
"A Comparison of Finite Aperture Phase . . . " by Busse and Miller from 1981 Ultrasonics Symposium, pp. 617-626.
"Phase Insensitive Acoustoelectric Transducer" by Heyman from J. Acoustic Soc. of America, vol. 64, No. 1, Jul. 1978, pp. 243-249.

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