Microwave acoustic spectrometer

Details Microwave acoustic spectrometer Microwave acoustic spectrometer

1979-06-25

1981-07-07

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 2704

Patent

active

042777410

ABSTRACT:
Magnetic and dielectric properties of a sample are determined by measuring the microwave absorption of the sample. A cavity containing the sample material is coupled to a microwave source and the radiation propagated to the cavity is modulated at a reference frequency. A microphone coupled to the cavity senses the pressure fluctuations resulting from the thermal changes generated in the sample by the absorption of the modulated microwaves and the microphone signal is analyzed at the reference frequency to provide an electrical output which is a measure of the microwave absorption by the sample material. Both dielectric and magnetic properties of the sample can be measured.

REFERENCES:
patent: 2792548 (1957-05-01), Hershberger
patent: 3820901 (1974-06-01), Kreuzer

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