Hardware system design of pyrometer based on FPGA and CCD

WANG Le, DONG Zhe, ZHANG Lei
(School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract: Aiming at the problem that the temperature of hightemperature objects are difficult to measure on-line in real time, the driving of CCD (charge-coupled device),image data acquisition, temperature conversion methods and data recombination were researched. A FPGA (field programmable gate array) was used as the control core, and the CCD driver was configured through the SPI (serial peripheral interface). After calibration, a direct look-up table was used to obtain temperature information. An embedded temperature measurement hardware system based on FPGA and CCD was proposed, which can measure the twodimensional temperature field of the object in real time. Gigabit Ethernet was used to send the recombined temperature and image data to the upper computer. The intermediate signals during the experimental process were captured to test the processing speed of the system. The results indicate that the data delay in the system is only 14 ms, the system processing and transmission speed can reach to the CCD highest frame rate of 60 fps under the CCD highest resolution. It provides a prerequisite for the host computer to feedback temperature in real time with high resolution.
Key words: optical measurement; temperature measurement; field programmable gate array (FPGA); charge-coupled device (CCD); real-time