Proceedings PaperAn Instrument For Measuring The MTF Of Lenses Used In Thermal Imaging And Other Infrared Systems (2 TO 14 um)
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An instrument is described which can be used for measuring directly the MTF of infrared optical systems operating in the wavelength range 2 to l4 /μm. The instrument uses a moire fringe technique for generating the test target, but a novel arrangement permits measurements at single spatial frequencies as well as over a continuous range of frequencies. The instrument is designed to give automatic normalization and has facilities enabling the line spread function to be measured directly. Some results of measurements on typical lenses are given and comparisons are made between some of these results and the MTF calculated from line spread function measurements and/or from the design data of the lens.