Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1996-12-18
1999-07-06
Regan, Maura
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324643, G01R 2726
Patent
active
059201959
ABSTRACT:
An apparatus and method for the moisture content measurement of compressible materials using pressure to firmly hold surface probes against the material to be measured. The apparatus uses moisture measurement circuitry employed in frequency domain impedance or time domain reflectometry devices to obtain moisture content readings from materials. These moisture content readings are based on the apparent dielectric constant of the measured material. Subsurface air voids or gaps found in loose, layered materials undesirably influence moisture measurement readings by reducing the apparent dielectric constant of the measured material. Pressure is supplied through the apparatus to the material in the proximity of the surface probes, thereby reducing air voids to enhance measurement accuracy. The apparatus and method are especially useful for compressible organic materials such as forest duff, hay and soil.
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Gasvoda David S.
Hungerford Roger D.
Robichaud Peter R.
Fado John D.
Regan Maura
Silverstein M. Howard
Stockhausen Janet I.
The United States of America as represented by the Secretary of
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