Moisture detection probe

Details Moisture detection probe Moisture detection probe

1989-07-10

1991-08-27

Noland, Tom

Measuring and testing

Moisture content or absorption characteristic of material

By heat conductivity

374 45, G01N 2518, G01N 2556

Patent

active

050422944

ABSTRACT:
A probe assembly for the measurement of moisture within a medium by indirect contact with the medium. The probe comprises an apparatus at the leading end of the probe to enable measurement of the moisture level within the medium. The apparatus comprises a thermal conductor linked to a heating source, a temperature sensor for enabling measurement of the heat dissipation rate in the thermal conductor upon isolation of the heating source and a heater for delivering energy from a power source to heat the thermal conductor via the heating source. The probe is surrounded by a controlled environment eliminating the need for pre-calibration of the probe. When the probe is inserted in the medium and the heater is isolated from the power source the heat dissipation rate is measurable and commensurate with the level of moisture in the medium.

REFERENCES:
patent: 3832882 (1974-09-01), Schoen, Jr.
patent: 4080821 (1978-03-01), Johnston
patent: 4197866 (1980-04-01), Neal
patent: 4532797 (1985-08-01), Yang
patent: 4717811 (1988-01-01), Fujii
patent: 4774831 (1988-10-01), Nordin
patent: 4845978 (1989-07-01), Whitford

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