Method of using pulse laser to calibrate transient surface temperature detectors

A dynamic calibration system for transient surface temperature detectors is introduced. In this system a pulse laser and a continuous laser are used as excitation sources. The static and dynamic calibrations have been carried out respectively with the use of the continuous CO2 laser and Nd-glass pulse laser. Several quick response thermocoupleshave been tested on the system. The experimental results have shown that this calibration system can be used to calibratetransient surface temperature detectors with a time response on order of microseconds.Keyword dynamic calibration, pulse laser, effipsoidal reflector, infrared detector, transient surface temperature detector 1JNTRODUCTION In the field of weapons, the measurement of transient surface temperature is important to the research of the performance and service life of guns. It is the circumstances of high temperature and high pressure in the bore of a gunthat makes the measurement oftransient surface temperature difficulty. At present, there are many methods of measuringtransient surface temperature. These methods can be divided roughly into two categories: the contact method and thenon-contact method. For example, the contact detectors specially designed for measuring the temperature field of flameand the surface temperatures at some parts of space shuttle when back to atmosphere are used in US. The thermocouple,which is made of NiCrINiSi, used to measuring transient temperature of bore wall of the 7.62mm guns was reported inUs and its response time can reach 1O s 11.In the measurement of transient temperature, we can also apply some non-contact methods, such as laser interferometry, spectrometry, etc.