1 March 1990 High-resolution thermal scanning for hot-strip mills
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Until recently, very few choices were available to a hot-strip mill operator desiringinfrared scanning. Measurements were often made using either portable non linescanning/imaging systems or slow linescanners originally designed for cement applications.3 Since then, important changes have taken place and the summer/fall of 1989 saw the introduction of no less than four different opto-mechanical linescanners as well as the increasing use at high object temperatures of various near-IR (CCD) linear-arrays in lieu of more traditional (mid) IR scanners. In comparison to earlier systems most, if not all, scanners provided higher spatial resolution (typically 2000 IR-points per line), higher scanning rate (typically20 - 100 Hz) and drastically improved measurement accuracy (at least for the opto-mechanical scanners, see below). This article will outline some of the results obtained in a typical steel mill environment with one of the highperformance linescanners of the new breed, and comments will be made on the emerging CCD-technology. For those interested in other line scanning applications with different object characteristics and surface temperature, some indications will also be given of the possibility to project the results obtained on other usages.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dag Holmsten, Rene Houis, "High-resolution thermal scanning for hot-strip mills", Proc. SPIE 1313, Thermosense XII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (1 March 1990); doi: 10.1117/12.21931; https://doi.org/10.1117/12.21931

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