Patent ID: 9188493
Filing Date: 2015-11-17
Classification: B22D,G01K

Abstract:
1. A method for measuring a surface temperature of a cast slab at a secondary cooling zone of a continuous caster, the method comprising the steps of: providing a plurality of nozzles, each nozzle having an inner cross section substantially circular in shape and an inner diameter of 5 mm to 30 mm; providing a plurality of optical fibers, each of the optical fibers having one end and another end; inserting the one end of each of the plurality of optical fibers into each of the plurality of nozzles; providing a plurality of tubes made of stainless steel, each tube connected to each of the nozzles such that a light axis of each of the optical fibers each substantially coincides with a central axis of each of the nozzles, positioning the plurality of the nozzles such that each of the nozzles is located between support rolls of the continuous caster that support the cast slab; spraying purge air from each of the nozzles toward a surface of the cast slab to form an air column and receiving a thermal radiation light from the cast slab at the one end of each of the optical fibers, the thermal radiation light passing through the air column formed by the purge air; gathering the other ends of the optical fibers in a bundle inside a housing in communication with each of the tubes to take images including core images of the other ends of the optical fibers gathered in the bundle, by using a two-dimensional or one-dimensional imaging means disposed inside the housing; and calculating the surface temperature of an area of the cast slab corresponding to each of the core images based on a pixel density of each of the core images in the taken images.