Thermal measuring and testing – Thermal gravimetric analysis
Patent
1984-06-11
1986-05-20
Levy, Stewart J.
Thermal measuring and testing
Thermal gravimetric analysis
73432R, G01N 2500
Patent
active
045897824
ABSTRACT:
A method and six devices for measuring the change in mass of a sample subjected to selected temperatures and fluid variables is disclosed. The test sample is subjected to centrifugal force to amplify the "apparent mass" of the sample by rotating the sample about a first axis of rotation. Any change in the mass of the test sample is then amplified by the centrifugal force and measured by the displacement or the displacement force of the sample. The above method and six separate devices are disclosed. The first device balances the mass of the test sample against a known reference weight. The second device generates a counter-rotational force about a second axis to bring the sample to a "nulled" position. The third device balances the force generated about the second axis against a known and adjustable balance beam. A reciprocating means is used to couple the balance beam to a rotating sample holder. The fourth device generates a counter force along the balance beam to bring the sample to a "nulled" position. The radial displacement force is measured in the fifth device and the radial displacement is measured in the sixth device. The devices are particularly adapted for mass change analysis in high temperature environments using high sweep gas rates and a variety of gaseous fluids.
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Levy Stewart J.
Noland Tom
Research Corporation
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