Abstract
AbstractThe relation between the instantaneous field of view (IFOV) and recognition performance of a thermal imager is discussed theoretically and a method of improving the target recognition performance applying the relation is presented. When the IFOV included in the evaluation function of the minimum resolvable temperature difference (MRTD) varies, the MRTD does not vary monotonically but has a minimum value. It is found that this value is obtained in the case where the product of the IFOV and target spatial frequency is 0.5. Then the MRTD is defined as the (MRTD)n, and it is shown that (MRTD)IL for various targets is the bottom envelope of MRTD curves for IFOV. Moreover, on the basis of these relations, the condition for obtaining (MRTD)IL by applying zoom optics and changing the IFOV is established and the improvement factor of recognition probability is compared to a fixed IFOV.The experimental results using a prototype serial scan thermal imager and the calculated values using the theory agree well in their basic characteristics.
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