| The measurement of the temperature of high-temperature objects is of great importance in many fields such as aerospace,metallurgy and energy.The development of non-contact temperature measurement,especially radiation measurement,has opened up new paths for it.As one of the important instruments for radiation temperature measurement,photoelectric pyrometer plays an important role in the field of precision temperature measurement by virtue of moderate price,easy operation,high accuracy and stability.This subject in accordance with the project requirements,based on the experience of previous research on photoelectric pyrometer developed a set of temperature measurement range in the(500-1800)℃photoelectric high temperature measurement system,using radiation temperature measurement theory to complete simple thermodynamic temperature measurement.From the perspective of thermal radiation temperature measurement principle,the article discusses the basic theory of radiation temperature measurement-the three laws of black body radiation,and then introduces three common radiation temperature measurement methods: brightness temperature measurement,full radiation temperature measurement and colorimetric temperature measurement.Based on the description of the principles of the three temperature measurement methods and their advantages and disadvantages,the design of the measurement system by the brightness measurement method was selected.The optoelectronic pyrometer system is mainly divided into two main parts,hardware and software,according to the system design scheme and indicators to select suitable devices for hardware design,including optical system construction,optoelectronic detector selection,amplification circuit and electrical display instrument design.For the software design,a LabVIEW-based software system was designed.The system mainly consists of the device driver module,parametersetting module and data acquisition processing module,which can realize the control of the temperature measurement system and data acquisition processing and other functions.After the construction of the platform was completed,the measuring system was indexed by the standard high-temperature blackbody furnace,and the accuracy test experiment was conducted on the measuring system with good indexing.The performance parameters of the measurement system were then evaluated,including amplifier gain factor,radiation source size effect,distance effect and short-term stability.An uncertainty rating was also performed on the measurement system based on the multipoint method of indexing.After debugging and testing,the experimental results met the requirements of the subject performance indicators,and completed the functions well. |
