Volume 43 Issue 12
Dec.  2021
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LIU Fangfang, ZHAO Jian, CONG Qiang, LI Tuotuo, TANG Tianjin, WU Jun. Design of Cooled Medium/Long Wave Infrared Dual-band Integrated Reflective Optical System[J]. Infrared Technology , 2021, 43(12): 1166-1171.
Citation: LIU Fangfang, ZHAO Jian, CONG Qiang, LI Tuotuo, TANG Tianjin, WU Jun. Design of Cooled Medium/Long Wave Infrared Dual-band Integrated Reflective Optical System[J]. Infrared Technology , 2021, 43(12): 1166-1171.

Design of Cooled Medium/Long Wave Infrared Dual-band Integrated Reflective Optical System

  • Received Date: 2021-05-18
  • Rev Recd Date: 2021-07-07
  • Publish Date: 2021-12-20
  • A three-mirror anastigmatic(TMA) optical system was adopted to prevent chromatic aberration of the refractive system by adding a dichroic beam splitter behind the tertiary mirror to simultaneously implement the image to the MWIR and LWIR detectors. The integrated system included three off-axis mirrors and a dichroic beams plitter. The surface of the tertiary mirror was an XY polynomial freeform surface that could correct system aberrations. The structure of the system was re-imaged with 100% cold shield efficiency. The F-number was 2.67, the full field of view(FOV) was 11.4°×1.8°, the working band is 3.55-3.93 μm for the MWIR channel and 10.3-12.5 μm for the LWIR channel. The modulation transfer function (MTF) average values of MWIR were greater than 0.5 at 25 lp/mm, and the MTF average values of the LWIR were greater than 0.4 at 12.5 lp/mm. The temperature compensation of the optical system was optical passive athermalization. The temperature range was -40℃ to +60℃.
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