High Temperature Melts Based On Optical Technology And Image Processing Technology, Non-contact Temperature Measurement System

In fire metallurgy process of nonferrous metal, the temperature of smelting metal is pivotal technologic control parameter. Whether the highness and the lowness of temperature is right relates directly to some important problems, such as whether the fusion process can progress normally, whether the quality of metallurgical product is eligible, whether the fusion metallurgy equipment can work safely, and how much the energy cost is in the process of the fusion, so the temperature measurement of smelting metal is very important. Based on the summarize of the commonly used contact and contactless temperature measurement techniques at present, and aiming at the complexity of the fire metallurgy process of nonferrous metal, the bad condition of the working environment, and the impossibility of using high temperature measurement techniques to do real time measurement on-line nowadays, the temperature measurement method combined with CCD image sensor technique, image processing technology and colorimetry technology is studied in this paper, by which the thermal radiation images of high temperature smelting metal is taken by using the industrial CCD digital camera and the superficial temperature field of high temperature smelting metal can be measured on-line. In this paper combined with thermal radiation theory, CCD working theory, optical system imaging theory and computer multimedia technology, the design method of this kind of temperature measurement system is studied, and the necessary capability of CCD image sensor in this thermal radiation measurement system and the main factors considered in selecting CCD image sensor parts and image collection "boards are analyzed as well. According to physical characters of high temperature smelting metal, a target segmenting arithmetic fitting for identifying the image of high temperature smelting metal is brought forward. The identifying arithmetic is that by using the double apex method and the automatic threshold-taking method of the max square error to confirm the pending segmentation threshold respectively at first, then according to the consistency of gray-level ofhigh temperature smelting metal, the better and proper segmentation threshold is selected, so that the gray-level of segmented target is smaller and the amount of gray-level of R color is the most. The experimental results show that the identifying arithmetic, which has much practicability, can recognize the high temperature smelting metal automatically from the different heat radiation images. Some high temperature smelting metal photos shot by color digital camera taken from fusion furnaces of a certain copper metallurgy industry were computed in emulational way. The result shows that this kind of temperature measuring method has merits of contactless temperature measurement, which is fast, convenient and accurate, and the surface temperature field of high temperature smelting metal can be computed, which has high practical value.