A Research On Temperature Signal Processing Technology And Algorithm For Pyrometer

Non-contact radiation temperature measurement technology has been widely used in gas turbines,metal smelting and other fields.Compared with traditional contact temperature measurement technology,it has the advantages of wide temperature range,no influence on target temperature distribution and fast response speed.However,in complex measurement conditions,especially under the influence of high-speed rotation of the target and strong background radiation,conventional radiation temperature measurement technology has problems such as difficulty in installation and low precision.The bottleneck in the development of temperature measurement technology.In this paper,I focus on the radiation temperature measurement problem of rotating high temperature dynamic targets,and focus on the signal processing and algorithm of the radiation thermometer used in this condition.The main research contents are divided into the following four aspects:(1)A lot of investigations are carried out on the special requirements of dynamic high temperature target temperature measurement.Based on the basic principle of ℃ radiation,the characteristics of current brightness temperature measurement,colorimetric temperature measurement,three-band temperature measurement and multispectral temperature measurement algorithm are analyzed.The rightness temperature measurement algorithm is used as the basic algorithm to study the temperature signal processing technology and the correction algorithm.(2)According to the high temperature target in the rotating state,the characteristics of the imaging type and single point radiation temperature measuring method are analyzed,and the design of the radiation temperature measuring system is based on the single point radiation measuring method with faster response speed;in order to restore the rotating target The temperature field distribution is designed to use the radial scanning method of the target rotation,and the precise scanning function is realized by the cooperation of the motor and the screw.(3)In the process of temperature signal processing,the synchronization method of position pulse signal and temperature signal is designed to realize the signal processing technology of extracting two-dimensional temperature field from one-dimensional temperature signal sequence,and the temperature field reconstruction program is written on LabVIEW.(4)Firstly,the black body furnace was used to calibrate the radiation temperature measurement system inside the laboratory,and a dynamic high temperature sample temperature measurement platform was built to correct the temperature and voltage response curve of the black body calibration.The designed temperature measurement system is verified by temperature signal acquisition and temperature field reconstruction.The error compensation algorithm based on dual-band and three-band is proposed and verified by experiments.In the process of calibration and experiment of the radiation temperature measurement system of this paper,it was found that the calibration accuracy was 1 ℃ after the calibration of the radiation temperature measurement system using the black body furnace.Within C.However,after the working conditions are changed,the distance,angle and other parameters will cause the temperature and voltage response curve(TV curve)to shift.The curve needs to be recalibrated to make the system achieve higher precision.The temperature of the experimentally collected data is heavy.Constructed related data processing,can get the temperature distribution of the rotating target,but the accuracy needs to be further improved.