Acoustic imaging system

Details Acoustic imaging system Acoustic imaging system

1991-12-20

1994-12-27

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

12866008, 12866101, G01N 2906, A61B 808

Patent

active

053754700

ABSTRACT:
An acoustic imaging system includes pairs of variable gain amplifiers for deriving essentially pairs of signals from respective signals generated in respective ultrasonic vibrators and the pairs of signals are superimposed on each other in a time difference corresponding to a phase angle of .pi./2 in frequency of ultrasonic waves. Amplification factors of the variable gain amplifiers are controlled so that the desired phase shift of the superimposed signals is obtained to attain dynamic focusing. Another acoustic imaging system includes a switch circuit having a two stage matrix switches construction that performs matrix switch functions in a smaller number of switch elements. Still another acoustic imaging system includes constituents for the aforementioned phase control for fine adjustment of delay time, the aforementioned switch circuit for rough adjustment of delay time, and variable gain amplifiers that perform smooth switching of the delay time.

REFERENCES:
patent: 4116229 (1978-09-01), Pering
patent: 4217909 (1980-08-01), Papadofrangakis et al.
patent: 4330875 (1982-05-01), Tachita et al.
patent: 4528854 (1985-07-01), Shimazaki
patent: 4632124 (1986-12-01), Hiller et al.
patent: 4643028 (1987-02-01), Kondo et al.

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