Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1999-02-08
2000-06-20
Ballato, Josie
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324689, 324696, 73 73, G01R 2726
Patent
active
060781815
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.
Ballato Josie
Fado John D.
Silverstein M. Howard
Solis Jose M.
Stockhausen Janet I.
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