The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 03, 1978
Filed:
Jan. 23, 1976
Nathaniel E Hager, Jr, Lancaster, PA (US);
Armstrong Cork Company, Lancaster, PA (US);
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.