Apparatus for transmitting and receiving sound

Details Apparatus for transmitting and receiving sound Apparatus for transmitting and receiving sound

1981-10-08

1984-03-06

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

128663, G01F 166

Patent

active

044346697

ABSTRACT:
In an ultrasonic Doppler velocimeter for measuring blood flow it is necessary to change the frequency of insonation according to the site and size of a vessel to be investigated. Several different crystal pairs are employed in a single probe, each pair associated with a different frequency. All of the transmitting crystals are connected in parallel, and all of the receiving crystals are connected in parallel. As a result, the single probe is suitable for investigating blood flow in different blood vessel conditions. Optimum insonation frequency selection is achieved by use of a voltage controlled oscillator, and a frequency control circuit which compares powers received at different frequencies. Signals representative of blood velocities appear at the output of a scaler which ensures that the same velocity provides the same output independently of frequency of insonation.

REFERENCES:
A. J. Sainz et al., A New Multi-Range Processing System for Directional Ultrasonic Doppler Blood Velocimetry, Mar. 1980, pp. 28-1-28-4.
F. D. McLeod, Directional Doppler Bloodflow Meter, May 1969.

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