Chinese Optics, Volume. 16, Issue 6, 1414(2023)
Narcissus suppression of medium-wave infrared imaging system
Fig. 1. Structural diagram of a catadioptric medium-wave infrared imaging system without narcissus suppression
Fig. 2. MTF of a catadioptric medium-wave infrared imaging system without narcissus suppression
Fig. 3. Inverted structure diagram of a catadioptric medium-wave infrared imaging system without narcissus suppression
Fig. 5. Changes of the narcissus spot in the detector image surface before and after focusing
Fig. 6. NITD of each lens surface of the medium-wave infrared imaging system
Fig. 8. Transmission structure diagram of the optimized medium-wave infrared imaging system
Fig. 9. MTF of the optimized catadioptric medium-wave infrared imaging system
Fig. 10. Main differences of the imaging system before and after optimization
Fig. 11. NITD of each lens surface of the optimized medium-wave infrared imaging system
Fig. 12. Changes of the narcissus spot in the detector image surface of the optimized system before and after focusing
Fig. 13. Simulation results of narcissus on the image surface through Tracepro modeling software
Fig. 14. Images of the infrared system before and after optimization
Table 1. MRTD values for different targets
View tableView in ArticleTable 1. MRTD values for different targets
Target frequency (cy/mrad) MRTD (K) 2.5 0.035 4.01 0.055 10.77 0.103
Table 2. YNI and I/IBAR values for the optical surfaces with serious narcissus
View tableView in ArticleTable 2. YNI and I/IBAR values for the optical surfaces with serious narcissus
Surface S2 S3 S5 S14 S15 S18 YNI 0.367 0.371 0.454 −0.091 −0.091 −0.298 I/IBAR 0.420 0.424 0.378 0.106 0.106 0.512
Table 3. Merit function of I/IBAR values with surface S5
View tableView in ArticleTable 3. Merit function of I/IBAR values with surface S5
OPER# type surf wave Hx Hy Px Py Target Weight Value 1 RAED 5 2 0 0 0 1 0 0 1.08 2 RAED 5 2 0 1 0 0 0 0 2.86 3 DIVI 1 2 0 — — — 0 0 0.378 4 ABSO 3 — — — — — 0 0 0.378 5 OPGT 4 — — — — — 1 1 0.378
Table 4. YNI and I/IBAR values of the surfaces with serious narcissus in optimized system
View tableView in ArticleTable 4. YNI and I/IBAR values of the surfaces with serious narcissus in optimized system
Surface S5 S18 YNI −0.52 0.74 I/IBAR 1.46 1.93
Table 5. NITD values before and after optimization
(K) View tableView in ArticleTable 5. NITD values before and after optimization
(K) Structural state Max Min ΔNITD Non-optimization 1.0484 0.8634 0.1850 Optimization 0.1576 0.1557 0.0019
Table 6. Simulation results of narcissus on the detector’s image surface during focusing
View tableView in ArticleTable 6. Simulation results of narcissus on the detector’s image surface during focusing
Structural state Maximum-intensity（W/m2） Average-intensity（W/m2） Total-luminous-flux（W） Theoretical design location 6.95×10−4 4.48×10−4 2.96×10−6 The focus group moves by +2 mm 6.97×10−4 4.49×10−4 2.97×10−6 The focus group moves by -2 mm 6.97×10−4 4.48×10−4 2.96×10−6
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He-yang BU, Lin-yao YU, Hao-nan TIAN, Jian WANG. Narcissus suppression of medium-wave infrared imaging system[J]. Chinese Optics, 2023, 16(6): 1414
Category: Original Article
Received: Jan. 5, 2023
Accepted: --
Published Online: Nov. 29, 2023
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