Thermal measuring and testing – Determination of inherent thermal property
Patent
1980-09-26
1983-04-26
Goldstein, Herbert
Thermal measuring and testing
Determination of inherent thermal property
G01N 2500
Patent
active
043811540
ABSTRACT:
The composition of a sample is determined with reference to a recorded standard using the same heater and sensor as that used to record the standard, by testing the sample only when its temperature has reached an equilibrium, and by compensating for differences in environment and starting temperature; accurate heater control is insured by maintaining a constant voltage across a series circuit consisting of a heater and a resistance load equal to the resistance of the heater; the heater is pulsed in an initial test sequence to heat the system to above ambient so that heat losses to the environment are substantially the same from test to test; a dynamic insulation system prevents heat loss from the sample under test; an improved test based on the sensed temperature of the sample immediately after the heater is turned off detects the presence of tungsten forgeries; a compensated infrared sensor eliminates the need for a direct contact temperature sensor; and tests are provided for determining various physical characteristics of an unknown sample.
REFERENCES:
patent: 3266307 (1966-08-01), Winter
patent: 3279239 (1966-10-01), Arends et al.
patent: 3765237 (1973-10-01), Blackener
patent: 3789654 (1974-02-01), Jones
patent: 3892125 (1975-07-01), Nunogaki
patent: 3981175 (1975-05-01), Hammond et al.
patent: 4088447 (1978-05-01), Walker
Stansbury et al. "Adiabatic Calorimeter for Metals in the Range 50.degree.-1000.degree. C." in Review of Scientific Insts. Feb. 1959, pp. 121-126.
Goldstein Herbert
The Hetra Corporation
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