Infrared and Laser Engineering, Volume. 52, Issue 2, 20220442(2023)
Optical system design of laser/infrared dual-mode annular aperture seeker
Figures & Tables(15)
Fig. 1. Imaging principle of laser/long-wave infrared dual-mode annular aperture ultrathin system. (a) Dual-mode paraxial refraction structure; (b) Dual-mode paraxial annular aperture reflective structure
Fig. 2. Relationship between the obscuration ratio and the outer diameter of the annular aperture ultrathin imaging system
Fig. 3. Layout of laser/LWIR dual-mode annular aperture ultrathin imaging system
Fig. 4. Exploded solid model of laser/LWIR dual-mode annular aperture ultrathin imaging system. (a) Front view; (b) Rear view
Fig. 5. MTF curves of dual-mode annular aperture ultrathin system imaging in LWIR
Fig. 6. Spot diagram of dual-mode annular aperture ultrathin imaging system at laser wavelength
Fig. 7. MTF of dual-mode annular aperture ultrathin system imaging in LWIR at different ambient temperatures. (a) 20 ℃; (b) −40 ℃; (c) 80 ℃
Fig. 8. Spot diagram of dual-mode annular aperture ultrathin system imaging in laser waveband at different ambient temperatures. (a) 20 ℃; (b) −40 ℃; (c) 80 ℃
Table 1. Design index of laser/LWIR dual-mode annular aperture ultrathin imaging system
View tableView in ArticleTable 1. Design index of laser/LWIR dual-mode annular aperture ultrathin imaging system
Parameter Value LWIR Laser Effective focal length/mm 70 53.8 Effective entrance aperture/mm 53.8 53.8 Effective F# 1.3 1.0 Wavelength/μm 7.7-9.5 1.064 Field of view/(°) 8 10 Detector/mm 7.68×6.144 Φ10 Length of system/mm ≤32 ≤32
Table 2. MTF values of dual-mode annular aperture ultrathin system imaging in LWIR
View tableView in ArticleTable 2. MTF values of dual-mode annular aperture ultrathin system imaging in LWIR
Field of view/(°) Directions Tangential Sagittal 0 0.154 0.154 2.8 0.146 0.154 4 0.136 0.150
Table 3. Spot RMS values of dual-mode annular aperture ultrathin imaging system at laser wavelength
View tableView in ArticleTable 3. Spot RMS values of dual-mode annular aperture ultrathin imaging system at laser wavelength
Field of view/(°) RMS radius/μm 0 2800.154 2.5 2520.154 3.5 225 5 2040.150
Table 4. MTF values of dual-mode annular aperture ultrathin imaging system in LWIR at different ambient temperatures
View tableView in ArticleTable 4. MTF values of dual-mode annular aperture ultrathin imaging system in LWIR at different ambient temperatures
Field of view/(°) 20 ℃ −40 ℃ 80 ℃ Tangential Sagittal Tangential Sagittal Tangential Sagittal 0 0.154 0.154 0.150 0.150 0.151 0.151 2.8 0.146 0.154 0.140 0.152 0.144 0.147 4 0.136 0.149 0.130 0.153 0.134 0.136
Table 5. Spot values of dual-mode annular aperture ultrathin imaging system at laser wavelength and different ambient temperatures
View tableView in ArticleTable 5. Spot values of dual-mode annular aperture ultrathin imaging system at laser wavelength and different ambient temperatures
Field of view/(°) RMS radius/μm 20 ℃ −40 ℃ 80 ℃ 0 280 0.154 287 0.154 289 0.154 2.5 252 0.154 258 0.154 256 0.154 3.5 225 230 231 5 204 0.150 208 0.150 207 0.150
Table 6. Tolerance of the dual-mode annular aperture ultrathin imaging system
View tableView in ArticleTable 6. Tolerance of the dual-mode annular aperture ultrathin imaging system
Tolerance Parameter Thickness/mm ±0.02 Element decenter/mm ±0.02 Element tilt/(′） ±1 Surface decenter/mm ±0.01 Surface tilt/(′) ±0.7 Aspheric PV value/μm ±0.2 Test wavelength/nm 632.8
Table 7. Tolerance results of dual-mode annular aperture ultrathin system imaging in LWIR
View tableView in ArticleTable 7. Tolerance results of dual-mode annular aperture ultrathin system imaging in LWIR
Field of view/(°) Tangential Sagittal Nominal Estimated Nominal Estimated 0 0.154 0.122 0.154 0.122 2.8 0.146 0.105 0.154 0.132 4 0.136 0.101 0.150 0.111
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Yafeng Xie, Mingxu Piao, Jinli Tang, Yuanming Zhao, Wenze Lian, Jieping Fan, Bo Zhang. Optical system design of laser/infrared dual-mode annular aperture seeker[J]. Infrared and Laser Engineering, 2023, 52(2): 20220442
Paper Information
Category: Optical design
Received: Jun. 27, 2022
Accepted: --
Published Online: Mar. 13, 2023
The Author Email: Piao Mingxu (piaomingxu123@126.com)
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