Measuring and testing – Vibration – By mechanical waves
Patent
1982-12-02
1985-02-26
Howell, Kyle L.
Measuring and testing
Vibration
By mechanical waves
128660, G01H 100
Patent
active
045011516
ABSTRACT:
An ultrasonic therapy applicator wherein therapeutic heating is provided by creating a diffuse ultrasonic field in a liquid, such as water, in a tank in which living tissue may be immersed. The diffuse acoustic energy is produced by frequency-modulating the driving ultrasonic frequency in a band employing "white noise" modulation. The apparatus consists of a reverberation tank suspended from a support by four wires. The support is used to mount a transducer, a hydrophone, a specimen holder and a stirrer. The tank is surrounded by a temperature bath. The hydrophone is used for measuring decay rates. The transducer is acoustically matched to the water. Ultrasound is coupled from the transducer via an ellipsoidal vertical reflector vertically aligned below the acoustic window of the transducer. To calibrate integral dosage a temperature sensing probe is used, of the differential temperature analysis type. The probe consists of two thermocouples, one embedded at the center of a RHO-C rubber sphere and the other mounted outside near the sphere. Measuring the differential temperature signal that results when the sphere is irradiated enables determination of the acoustic energy density. The RHO-C rubber has an acoustic impedance nearly equal to that of water, and therefore the probe does not significantly change the exposure field. The absorption coefficient of the rubber is satisfactorily high. Also, the RHO-C rubber holds its thermocouple firmly in place during comparative measurements. The probe minimizes disruption of the exposure and has an omnidirectional response.
REFERENCES:
patent: 3392570 (1968-07-01), Bonjour et al.
patent: 4166451 (1979-09-01), Salera
Howell Kyle L.
Jaworski Francis J.
The United States of America as represented by the Department of
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