MEASURING THE MTF FOR FOCAL-PLANE ARRAYS USING RANDOM NOISE TARGETS

The previous development of a unique discrete modulation transfer func tion (DMTF) for infrared systems based on focal plane arrays has solve d the multivalued problem which is associated with the non-isoplanatic nature of discrete systems. This paper proposes an efficient method f or measuring this DMTF using random noise targets, which have a bandwi dth equal to that of the collection optics but much larger than the Ny quist rate of the detector array. A microscan technique has been used in order to measure this DMTF beyond the passband of the detector arra y.