Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1984-06-14
1990-05-08
Cuchlinski, Jr., William A.
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
374 9, 364557, G01J 500
Patent
active
049244787
ABSTRACT:
A method of and device for contactless measuring of temperature of an object independently of its emissivity in infrared and/or visible range, is based on finding, by means of Planck law of radiation a curve which is the sum of the radiance or radiant intensity of a radiator having temperature and emissivity of the object and the radiance or radiant intensity of a radiator having the temperature of environment, the latter radiation being reflected by the object with the reflectivity .rho.=1-.epsilon. where .epsilon. is the emissivity of the object. The actual temperature of the object is found from the curve which is most similar to the curve of at least two values of radiance or radiant intensity detected from the object, plotted against the wavelengths. The device for carrying out the method includes a spectrometer, a modulator rotating at constant speed and having at least two filtering segments for the radiation wavelengths, an analog/digital converter clocked by pulses derived from the modulator to produce at its output digital signals, a microprocessor for reiteratively processing the digital data according to the Planck law of radiation, and a display unit for reading out the computed emissivity, the temperature of the object and the temperature of the environment.
REFERENCES:
patent: 3401263 (1968-09-01), Birkebak
patent: 3483378 (1969-12-01), Murray
patent: 3539807 (1970-11-01), Bickel
patent: 4120200 (1978-10-01), Braun
patent: 4142417 (1979-03-01), Cashdollar et al.
patent: 4225230 (1980-09-01), Dostoomian et al.
Laid-Open Japanese application publication 1980 by Nippon Steel Corp., To Iuchi.
Cuchlinski Jr. William A.
Deutsche Forschungs -und Versuchsanstalt fur Luft -und Raumfahrt
Worth W. Morris
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