Parabolic focussing thermal detector for low level ultrasonic po

Details Parabolic focussing thermal detector for low level ultrasonic po Parabolic focussing thermal detector for low level ultrasonic po

1977-10-31

1979-01-09

Queisser, Richard C.

Measuring and testing

Vibration

By mechanical waves

G01H 312

Patent

active

041332121

ABSTRACT:
A system and technique for determining the total radiated ultrasonic power output from a diagnostic ultrasound device having an output transducer includes a water chamber having a parabolic reflector. The transducer is mounted on the chamber at a location so that acoustic power from the transducer is focussed by the parabolic reflector to a first thermistor chip mounted in the chamber on a sound-absorbing rubber plate. The rise in temperature of the thermistor chip due to sound absorption changes its resistance. The thermistor chip is connected in one leg of a Wheatstone bridge. A reference thermistor chip is mounted on the rubber plate away from the ultrasonic beam and is connected in an opposite leg of the bridge. Starting from a null setting of the bridge, the output of the bridge after a suitable "response time" is in accordance with the acoustic energy delivered by the transducer.

REFERENCES:
patent: 2398117 (1946-04-01), Rost et al.
patent: 3832889 (1974-09-01), Bauer

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