Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1982-11-23
1985-03-05
Frankfort, Charles
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
374 2, 374137, 374166, 374167, 73159, G01J 510, G01J 508
Patent
active
045027935
ABSTRACT:
A camera contains a row of diodes sensitive to infrared radiation and mounted on a turntable for rotation about the optical axis of the camera. The signals from the diodes provide a temperature profile of a band across the width of a strip of hot rolled steel moving in a direction orthogonal to the optical axis and to the length of the row of diodes. Since the diodes are low accuracy devices, their measurements are compensated by normalizing co-efficients derived by comparison with the signal provided by an optical pyrometer viewing the central part of the steel strip in the region of the optical axis. To enable all diodes to be calibrated, calibration is effected with the turntable rotated 90.degree. to align all the diodes with the central part of the strip as viewed by the pyrometer. The camera may be mounted on one arm of a C-frame having X-ray tubes in an arm and X-ray detectors in the other arm for the purpose of measuring the thickness profile of the strip in known way. The compensated temperature measurements can then be used to correct the corresponding thickness measurements to take account of the variation in apparent thickness with density, and hence temperature.
REFERENCES:
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patent: 3670568 (1972-06-01), Kubo
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Peter Bohlander, "Determination of Position Size and Temperature Distribution of Hot Rolling Stock with the Aid of Self-scanning Photodiode Lines", Stahl und Eisen, No. 19 of 1977, Sep. 22, 1977, pp. 927-932.
Adams Derek W.
Smith Kenneth B.
Corr Denis E.
Frankfort Charles
Gaudier Dale
Schlumberger Electronics (UK) Limited
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