Research Of The System To Measure The Temperature Field Of High Temperature Melting Metal Based On CCD Image Sensor

The temperature measurement of melting metal plays an important role in the metallurgy process of nonferrous metal, because the temperature of melting metal is a pivotal parameter to insure the quality of product, achieve the autocontrol, optimize the decision-making, economize the heat energy and reduce the energy cost. However, due to the complex technics and the bad condition in the metallurgy process, it is difficult to achieve the real time measurement of the temperature field of the melting metal in the furnace by the existing high temperature measurement techniques. Therefore it is urgently necessary to develop a simple and convenient temperature measure device which is capable to measure the temperature field of the melting metal quickly.Recently, with the development of photoelectric technology, computer technology and digital image processing technology, the contactless temperature measurement technology based on color CCD sensor has become a focus of research in the field of high temperature measurement. In order to measure the surface temperature field of high temperature melting metal, in this paper the contactless temperature measurement theory based on color CCD is studied systemically. The connection between the output of color CCD and the temperature of radiator is discussed in detail, and aiming at the problem that the temperature measurement is short of the veracity, main sources of the measure error is analyzed, and a corrected colorimetric temperature measurement is proposed.In this paper, all the essential instruments structureing of the contactless temperature measurement system are studied, before the method how to select temperature measurement equipments is proposed, and a contactless temperature measurement system based on color CCD image sensor is constructed. In view of that some functions of CCD image sensor that is developed and manufactured as vidicon bring some adverse influence to temperature measurement, the method how to avoid such adverse influence is discussed.In the end, the contactless temperature measurement system is calibrated on a black-body oven in National Institute of Metrology P.R.China, and a lot of steady experiment dates are gained. The result of calibration shows that the corrected colorimetric temperature measurement proposed in this paper can effectively reduce the measure error, and this kind temperature measurement used in measure the temperature field of melting metal has remarkable practical value.