This paper reviews the
high temperature measurement technique commonly used in
welding study and introduces the working principle and application characteristics of the typical contact and
non-contact temperature measurement methods.As a kind of typical
contact temperature measurement instrument,thermocouple is accurate,simple,convenient and flexible.So up to now it has been widely used in welding study.However,it can only measure the point temperature and may interfere with the temperature field of the test area.Non-contact temperature measurement method mainly includes radiation temperature measurement and interferometric temperature measurement.It will not destroy the temperature field because the temperature measurement sensor will not contact the object measured.Quick and real-time measurement of temperature filed can be achieved by combining with the digital image processing technology.The dynamic change of the temperature field can be comprehensively and visually reflected.Therefore,non-contact temperature measurement technique becomes the development trend of high temperature measurement and will be used more and more widely in measuring the temperature field of weld arc and pool.
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