Measuring and testing – Moisture content or absorption characteristic of material – By heat conductivity
Patent
1992-06-29
1993-11-02
Cuchlinski, Jr., William A.
Measuring and testing
Moisture content or absorption characteristic of material
By heat conductivity
364556, 374 45, 7386311, G01N 2556
Patent
active
052575322
ABSTRACT:
Moisture content measurements are accomplished as a function of temperature by measuring the temperature-difference versus natural-logarithm-of-heating-time response of a sample of a predetermined material during a predetermined interval of application of a predetermined quantity of heat, determining the slope of that response at a portion thereof of substantially maximum slope, determining the mean sample temperature through the duration of that response portion, and calculating the moisture content of the sample as a function of that slope and that mean temperature. A thermal probe is used for both applying controlled heat to a material sample and sensing resulting temperature changes within the sample. The probe includes a line heat source and either a thermocouple sensing element or a thermistor sensing element. Sample holders are employed which limit diversion of heat from the heater via paths other than through the sample material. In one embodiment the sample holder has an externally controllable internal volume to facilitate measurements by establishing a predetermined sample density.
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Hayakawa Kan-ichi
Wang Jian-Jun
Cuchlinski Jr. William A.
Gutierrez Diego F. F.
Phelan Charles S.
Rutgers The State University of New Jersey
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