Abstract

We report a midinfrared dual-field-of-view (FOV) optical system design for an airborne electro-optical targeting system. To achieve miniaturization and weight reduction of the system, it has a common aperture and fore-optics for three different spectral wavelength bands: an electro-optic (EO) band (0.6~0.9 μm), a midinfrared (IR) band (3.6~4.9 μm), and a designation laser wavelength (1.064 μm). It is free to steer the line of sight by rotating the pitch and roll axes. Our design co-aligns the roll axis, and the line of sight therefore has a fixed entrance pupil position for all optical paths, unlike previously reported dual-FOV designs, which dispenses with image coregistration that is otherwise required. The fore-optics is essentially an achromatized, collimated beam reducer for all bands. Following the fore-optics, the bands are split into the dual-FOV IR path and the EO/laser path by a beam splitter. The subsequent dual-FOV IR path design consists of a zoom lens group and a relay lens group. The IR path with the fore-optics provides two stepwise FOVs (1.50° × 1.20° to 5.40° × 4.32°), due to the insertion of two Si lenses into the zoom lens group. The IR optical system is designed in such a way that the location and f-number (f/5.3) of the cold stop internally provided by the IR detector are maintained when changing the zoom. The design also satisfies several important performance requirements, including an on-axis modulation transfer function (MTF) that exceeds 10% at the Nyquist frequency of the IR detector pitch, with distortion of less than 2%.

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  12. S. Pal and L. HazraStructure design of mechanically compensated zoom lenses by evolutionary programmingOpt. Eng.201251063001
  13. K.-L. HuangSynthesis of first order designs of optically compensated catadioptric zoom optical systemsProc. SPIE19973129108118
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  17. D. Ren and J. R. Allington-SmithApochromatic lenses for near-infrared astronomical instrumentsOpt. Eng.199938537542
  18. A. Miks and J. NovakParaxial analysis of three-component zoom lens with fixed distance between object and image points and fixed position of image-space focal pointOpt. Express2014221557115576
  19. N. Gat, J. Zhang, M. D. Li, L. Chen, and H. GurrolaVariable cold stop for matching IR cameras to multiple f-number opticsProc. SPIE2007654265420Y

Other (19)

H. Vogel and H. SchlemmerDual-band infrared cameraProc. SPIE2005596459640S-2

I. ClarkExploitation of EO Technologies from the EMRS DTCProc. SPIE2007673967390K

Y. Yoon, G. Yu, C. Noh, and D. SongRobust scanning scheme over large area for airborne EO/IR cameraProc. SPIE2011818581850X-1

L. Zhang, J. Lai, and Y. HuangDesign of visible/long-wave infrared dual-band imaging optical systemProc. SPIE201610154101540V-1

M. Gerken, J. Fritze, M. Munzberg, and M. WeispfenningMilitary reconnaissance platform for the spectral range from the visible to the MWIRProc. SPIE201710177101770C-1

J. Lee, Y. Jung, S. Ryoo, Y. Kim, B. Park, H. Kim, S. Youn, K. Park, and H. LeeImaging performance analysis of an EO/IR dual band airborne cameraJ. Opt. Soc. Korea201115174181

S. Seong, J. Yua, D. Ryu, J. Hong, J. Yoon, S. Kim, J. Lee, and M. ShinImaging and radiometric performance simulation for a new high performance dual band airborne reconnaissance cameraProc. SPIE20097307730705

A. Mahmoud, D. Xu, and L. XuOptical design of high resolution and shared aperture electro-optical/infrared sensor for UAV remote sensing applicationsProc. IEEE International Geoscience and Remote Sensing SymposiumChina2016Nov.29212924

W.-J. Chang, X.-Z. Zhang, Y.-D. Luan, and B. ZhangDual FOV infrared lens design with the laser common aperture opticsProc. SPIE2015944994492B

R. G. SementelliEO/IR dual-band reconnaissance system DB-110Proc. SPIE19952555222231

Y. NevoDual-band opticsOpt. Eng.201352053002

S. Pal and L. HazraStructure design of mechanically compensated zoom lenses by evolutionary programmingOpt. Eng.201251063001

K.-L. HuangSynthesis of first order designs of optically compensated catadioptric zoom optical systemsProc. SPIE19973129108118

B. J. Housand and S. J. JesseCombined laser/FLIR optics systemUS Patent20026,359,681 B1

P. KlocekHandbook of Infrared Optical MaterialsMarcel Dekker Inc.New York, USA1991

G. E. Wiese and F. DumontRefractive multispectral objective lens system and methods of selecting optical materials thereforUS Patent20056,950,243 B2

D. Ren and J. R. Allington-SmithApochromatic lenses for near-infrared astronomical instrumentsOpt. Eng.199938537542

A. Miks and J. NovakParaxial analysis of three-component zoom lens with fixed distance between object and image points and fixed position of image-space focal pointOpt. Express2014221557115576

N. Gat, J. Zhang, M. D. Li, L. Chen, and H. GurrolaVariable cold stop for matching IR cameras to multiple f-number opticsProc. SPIE2007654265420Y

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