Design Of CCD Pyrometer Hardware System Based On FPGA

Temperature measurement is an important means to ensure product quality and production safety in many industrial production fields such as metallurgy and energy.Because of the limitations of installation space and equipment movement,traditional contact temperature measurement is difficult to measure temperature online.The noncontact temperature measurement method based on CCD pyrometer is widely used in the field of high temperature measurement because of the advantages of non-invasiveness,high response,and high resolution surface temperature field.From this perspective,this paper introduced the domestic and overseas research status of temperature measurement methods and application effects,compared the advantages and disadvantages of different temperature measurement methods,analyzed the advantages of radiation temperature measurement and the following research results were obtained:1.Based on CCD single-spectra I radiation temperature measurement model,this paper established a temperature measurement system with CCD and FPGA as the core:CCD sensor was driven by AD9923 A chip;FIFO and ping-pong cache were designed to store data;An temperature-grayscale mapping table was established based on the temperature measurement model so that the temperature measurement system could quickly obtain temperature data by looking up the table;The image and temperature data were eventually packaged according to a specific format,and were transmitted to the host computer based on the UDP protocol by a Gigabit Ethernet for further processing.2.According to the temperature measurement system program,the system hardware was designed: the board-level design was divided into three parts: The CCD sensor and driver design as the first part;Data acquisition,data processing and data transmission based on FPGA as the second part;Power supply as the third part.For the FPGA program,the top-down method was used to design the driver.And these programs were verified by test files in simulation platform.3.The system hardware was tested: the system run steadily,and FPGA timing met the requirements.Data delay in the system was only 16.72 ms,the system processing and transmission speed can reach to the CCD highest frame rate of 60 fps.The Ethernet transmission bandwidth can reach up to 960 Mbps,and the packet loss rate is controlled at about 0.13%.Within the bandwidth,when the CCD image resolution is 0.3 million,the image frame rate can reach 140fps;when the CCD frame rate is 30 fps,the image resolution can reach 1.4 million.4.Experiments on CCD imaging: The gray value output generated by CCD dark noise was tested,the maximum grayscale output was 12,and the maximum average grayscale output was only 0.71;The imaging non-uniformity was analyzed,the non-uniformity index was about 4.32%.The results showed that the imaging quality was better.