Method for calibrating surface temperature of metal flat plate

Abstract

The invention relates to a method for calibrating surface temperature of a metal flat plate, which comprises the following steps: heating one surface of a measured metal flat plate by taking a constant temperature bath medium as a heating source, and installing a plurality of direct contact type thermal sensors on the surface to measure the temperature of the measured metal flat plate; measuring the surface temperature of the measured metal flat plate on the other surface of the to-be-measured metal flat plate with a non-contact type temperature-measuring apparatus; and calculating the surface emissivity of the measured metal flat plate according to the temperature measurement principle Stefan-Boltzmann law of an infrared temperature-measuring apparatus, wherein the Stefan-Boltzmann law is that the relationship between the radiant energy of a black body and the temperature T of the black body is as follows: W is equal to epsilon*alpha*T4, where Boltzmann constant alpha is equal to 5.67*10<-8>W / m<2>.K<4>, T is the absolute temperature of a tested object and has a unit of K, and epsilon is the surface emissivity of the tested object. The method provided by the invention is simple and easy to implement, and can accurately measure the surface emissivity of the measured metal flat plate so as to ensure accurate surface temperature measurement of the measured metal flat plate.

Description

technical field [0001] The invention relates to the technical field of heat treatment of cold-rolled metal strips, in particular to a method for calibrating the surface temperature of smooth and non-oxidized metal plates in the heat treatment process of metal strips. The field of experimental research and product development with surface metal plates. Background technique [0002] With the increasing demand for high-quality products in various industries, the process requirements for heat treatment of metal plates are becoming more and more stringent. In the heat treatment process, in order to obtain a flat metal product with certain mechanical properties and good surface properties, it is necessary to precisely heat or cool the flat metal to a specific process temperature point (or within a temperature range) to ensure the mechanical properties or surface quality of the flat metal within the range required by the product. Therefore, we need to ensure the accuracy of the s...

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Problems solved by technology

[0004] However, the non-contact measurement method is disturbed by many factors. For example, the accuracy of the temperature measurement of the infrared thermal imager is affected by the emissivity of the surface of the measured object, the ambient temperature, the atmospheric temperature, the atmospheric attenuation rate, and the solar radiation. The impact is most pronounced, and the results of direct measurements are often inaccurate

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