Measuring and testing – Gas content of a liquid or a solid – By vibration
Patent
1976-02-27
1977-06-07
Goldstein, Herbert
Measuring and testing
Gas content of a liquid or a solid
By vibration
G01N 2518
Patent
active
040275248
ABSTRACT:
Apparatus for directly measuring the quantity .sqroot..rho.ck of a test specimen such as a wind tunnel model where .rho. is the density, c is the specific heat and k is the thermal conductivity of the specimen. The test specimen and a reference specimen are simultaneously subjected to the heat from a heat source. A thermocouple is attached to the reference specimen for producing a first electrical analog signal proportional to the heat rate Q that the test specimen is subjected to and an infrared radiometer that is aimed at the test specimen produces a second electrical analog signal proportional to the surface temperature T of the test specimen. An analog-to-digital converter converts the first and second electrical analog signals to digital signals. These digital signals are applied to a computer for determining the quantity .sqroot..rho.ck by computing the quantity ##EQU1## WHERE T.sub.i is the initial test specimen temperature and t is the elapsed time from the time that the specimens were first subjected to the heat source.
REFERENCES:
patent: 3672204 (1972-06-01), Green
patent: 3789654 (1974-02-01), Jones
Katayama et al., "Transient Comparison Methods of Simultaneous Measurement of Thermal Properties" in Bull JSME (Japan), vol. 12, No. 54, 1969, pp. 1439-1447.
Corwin Richard R.
Creel, Jr. Theodore R.
Fletcher James C. Administrator of the National Aeronautics and Space
Jones Robert A.
Kramer Joseph S.
Goldstein Herbert
King William H.
Manning John R.
Osborn Howard J.
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