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- W4232656525 abstract "The prototype of a portable ultrasonic radiometer for use as a field survey intrument of therapeutic ultrasonic equipment has been developed by the Bureau of Radiological Health. This instrument employs a solenoid balance arm principle. One end of the balance arm has a movable helical coil, which moves inside a fixed helical coil, and the other end has an airbacked target 6 cm in diameter, which intercepts the entire ultrasonic field. Near frictionless rotation of the balance arm is achieved using a jeweled fulcrum. A reference position of the target is predetermined as the null point, and upon application of the ultrasonic power, deflection of the target occurs. Current through the solenoid is used to reposition the target at the null point, and the current required is an indicator of the total ultrasonic power. A digital readout system directly displays this power output utilizing a manual zeroing capability. The instrument provides a wide dynamic range of 100 mW–100 W with a reproducibility error of less than ±10%. The advantages of the resulting system over other measuring systems such as the chemical microbalance, radiation pressure float system, hydrophone, calorimeter, etc., are portability, ease of measurement, digital readout, manual zeroing capability, direct linear measurement method, closed system, ease in setup, and comparable accuracy and reproducibility." @default.
- W4232656525 created "2022-05-12" @default.
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- W4232656525 date "1973-01-01" @default.
- W4232656525 modified "2023-10-16" @default.
- W4232656525 title "A Portable Ultrasonic Radiometer" @default.
- W4232656525 doi "https://doi.org/10.1121/1.1982419" @default.
- W4232656525 hasPublicationYear "1973" @default.
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