Title

Advances in Infrared Line Scanning for Hot Strip Mill Temperature Measurement

Advances in Infrared Line Scanning for Hot Strip Mill Temperature Measurement

Authorship

SALISBURY, RICHARD; ALMQVIST, PETER

SALISBURY, RICHARD

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ALMQVIST, PETER

I am this author

DOI

10.5151/2594-5297-LA6866

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Abstract

Production of rolled strip products with uniform metallurgical and physical qualities requires consistent heating, rolling and processing. This can only be achieved if the temperature of the product is accurattely known and maintained from the casting to the finishing sections. Until now temperature measurement on hot strip mills has had to rely largely on single point (spot) pyrometers. These are generally of a single or dual wavelength type. They are limited by their fixed position to the strip (usually mill centre line), large spot size and slow response. They do not give any indication of cross strip uniformity, cannot compensate for sideways strip movement and have no significant Operator feedback or quality value. Clearly they offer no information regarding edge effects or temperature related process variables. In some progressive plants, infrared line scanners have shown the advantages of real time cross strip temperature profiles. However, in nearly all cases this equipment has been used largely as an independent sensor to provide qualitative information and not as an integrated process measurement, control or formal quality tool.

Production of rolled strip products with uniform metallurgical and physical qualities requires consistent heating, rolling and processing. This can only be achieved if the temperature of the product is accurattely known and maintained from the casting to the finishing sections. Until now temperature measurement on hot strip mills has had to rely largely on single point (spot) pyrometers. These are generally of a single or dual wavelength type. They are limited by their fixed position to the strip (usually mill centre line), large spot size and slow response. They do not give any indication of cross strip uniformity, cannot compensate for sideways strip movement and have no significant Operator feedback or quality value. Clearly they offer no information regarding edge effects or temperature related process variables. In some progressive plants, infrared line scanners have shown the advantages of real time cross strip temperature profiles. However, in nearly all cases this equipment has been used largely as an independent sensor to provide qualitative information and not as an integrated process measurement, control or formal quality tool.

Keywords

thermography; quality control; process control

thermography; quality control; process control