Quickly performed measuring method for ascertaining the concentr

Details Quickly performed measuring method for ascertaining the concentr Quickly performed measuring method for ascertaining the concentr

1979-02-28

1980-11-11

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 2704

Patent

active

042335590

ABSTRACT:
Conventionally, the concentration of a polar component in an otherwise non-polar or negligibly polar material, e.g., water content in pourable coal, is ascertained by measuring the attenuation of electromagnetic waves transmitted through a layer-thin sample of the material, the waves having a frequency as near as possible to the maximum-dipole-relaxation-loss frequency f.sub.o, in order to maximize the power-loss effect of the transmitted waves, this being directly attributable to the polar component, and thereby serving to accentuate the effect of the polar component in the measurement signal. The present invention operates at lower frequencies, associated with low dipole-relaxation power-loss, and measures the time delay of the thusly transmitted waves, achieving an unexpected degree of temperature-independence in the measurement signal obtained, and simultaneously, because the power attenuation per unit thickness of the sample is so greatly decreased, making possible the use of samples of unprecedently great thickness, e.g., 1-meter-thick masonry walls whose water content is to be ascertained, compared to the 0.1-meter or 0.2-meter-thick samples to which such techniques have hitherto been limited.

REFERENCES:
patent: 2774876 (1956-12-01), Dicke
patent: 3093825 (1963-06-01), Allen
patent: 3155898 (1964-11-01), Chope
patent: 3448380 (1969-06-01), Harrington
patent: 3538434 (1970-11-01), Brown et al.

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