A study on characteristics of fundamental performances for thermograph

The noise equivalent temperature difference (NETD) and the minimum detectab le size (MDS) as a spatial resolution, are most important performance indic es of thermograph. For such indices, a wide variety of standards and test/e valuation methods have been defined until now, but, it is very important to establish more objective standards for the quantification of thermographs. This paper presents two matters, one is a new method to obtain noise equiv alent temperature difference by standard deviation of radiance temperature at individual pixels in thermogram, and the another is the necessity to cla rify the relationship between the size of an object to be measured and the temperature reading. In the former, we can treat the noise equivalent tempe rature difference quantitatively and objectively, as this method depends up on statistical treatment, while in the latter we can quantitatively measure the temperature of the measuring object in the detectable size.