1 July 2002 Compact MWIR zoom camera with 20:1 zoom range and automatic athermalization
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A compact mid-wavelength infrared zoom camera with a zoom range of 20:1 and automatic athermalization has been developed. The moving groups for a wide zoom range are only two lens groups and the loci of zoom are very simple, which allows easy access of optomechanical and electromechanical design. In addition, the microscanning technique was introduced to improve resolving power. We acquired increased resolving power of 7.6 cycles/mrad, superior to the original Ny- quist frequency of 4.5 cycles/mrad. The temperature range, being -30 to + 55°C, in which the camera is to operate, is rather wide. The minimum resolvable temperature difference of the zoom camera is 0.3°C at 6 cycles/mrad.
Hyun Sook Kim, Chang Woo Kim, Seok-Min Hong, "Compact MWIR zoom camera with 20:1 zoom range and automatic athermalization," Optical Engineering 41(7), (1 July 2002). https://doi.org/10.1117/1.1481048

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