Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1996-03-15
1997-11-25
Dougherty, Elizabeth L.
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
374 9, 374126, 2503383, 2503417, G01J 500
Patent
active
056904304
ABSTRACT:
Method and apparatus for measuring the surface temperature/emissivity of coated steel strip during a coating (e.g., galvannealing) process. The apparatus includes first and second radiation sensors each having a response exponentially related to the reciprocal of absolute temperature when viewing a blackbody source, and each positioned to receive focused radiation from the surface to be measured to provide first and second signals indicative of the radiation received by the sensor, respectively. To provide the focused radiation, the apparatus includes an optical system for gathering thermal radiation emitted by the surface to be measured and focusing it onto the sensors after a first common filter and second individual filters of differing wavelengths such that the first sensor is responsive to shorter wavelengths, the second sensor is responsive to longer wavelengths, and both sensors view the same area simultaneously. Finally, a processing means is provided for processing the two sensor signals to determine temperature/emissivity. Several variations of the processing means are provided including one which uses a Ratio Correction Factor (RCF) and an apparent emissivity (ECA) for determining temperature/emissivity while another one uses a Black Body Deviation Factor (BBDF).
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Amrozowicz Paul D.
Bethlehem Steel Corporation
Dougherty Elizabeth L.
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