Emissimeter and method of measuring emissivity

Details Emissimeter and method of measuring emissivity Emissimeter and method of measuring emissivity

1976-01-23

1978-10-03

Woodiel, Donald O.

Measuring and testing

Gas content of a liquid or a solid

By vibration

73355R, G01N 2500

Patent

active

041177126

ABSTRACT:
A method and apparatus for ready measurement of total hemispherical emissivity of a surface under ambient conditions, in situ. The apparatus, which may be readily made portable, comprises a heat sink to which is laminated a metal foil heater enclosed in a thermal insulating film. A black coating of known emissivity is applied to the exposed surface of the film and a fast-responding heat flux sensor is attached thereto. This apparatus is spaced a predetermined distance from a test surface and the enclosed air space is surrounded by a reflective skirt. A power source, such as a battery, powers the heater with a fixed current, and a suitable voltmeter is driven by the heat sensor. The method of measurement comprises equalizing the temperature of heat sink and test surface, energizing the heater and noting the steady state value of the voltage provided by the heat sensor. By employing a predetermined calibration curve, derived with the fixed heater current and various surfaces of known emissivity, the emissivity of the test surface can be read off the curve corresponding to output voltage of the heat sensor.

REFERENCES:
patent: 3045473 (1962-07-01), Hager, Jr.
patent: 3069983 (1962-12-01), Kerstetter
patent: 3277715 (1966-10-01), Vanderschmidt
patent: 3529473 (1970-09-01), Hager, Jr.
patent: 3796099 (1974-03-01), Shimotsuma et al.
Hager, Jr., N. E.; "Method . . . Apparatus", 7th Conference on Thermal Conductivity, NBS Spec. Pub. No. 302, 1968; pp. 241-246.
Shulte, E. H.; "Pulsed . . . Conductivity"; 9th Conference on Thermal Conductivity; 1969; pp. 589-598.

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