Infrared and Laser Engineering, Volume. 54, Issue 7, 20250182(2025)
Design method of focal length thermal stability for airborne image-space telecentric lens
Figures & Tables(18)
Fig. 8. Analysis results of the system tolerance sensitivity with
Fig. 12. Focal length variations characterization of error-prone optical systems
Table 1. Optional materials for spacers
View tableView in ArticleTable 1. Optional materials for spacers
Material name Coefficient of thermal expansion×10−6/℃ AL6061 23.6 06 Cr19 Ni10 17.3 TC4 8.6 PEEK 450 G 45 Delrin 150 100
Table 2. Analysis results of spacer thickness tolerance
View tableView in ArticleTable 2. Analysis results of spacer thickness tolerance
No. Tolerance/mm Standard Variation 3 −0.05 0.30930 − 0.02224 3 0.05 0.34242 0.01089 6 −0.05 0.33736 0.00582 6 0.05 0.31198 − 0.01956 7 −0.05 0.33729 0.00575 7 0.05 0.31154 − 0.02000 10 −0.05 0.33043 − 0.00111 10 0.05 0.32653 − 0.00501 12 −0.05 0.32888 − 0.00266 12 0.05 0.33089 − 0.00065
Table 3. Focal length variation of the original system
View tableView in ArticleTable 3. Focal length variation of the original system
Temperature/℃ Focal length/mm Focal length variation/μm −20 23.9597 −12.2 −10 23.9627 −9.2 0 23.9657 −6.2 10 23.9688 −3.1 20 23.9719 0 30 23.9750 3.1 40 23.9781 6.2 50 23.9812 9.3 60 23.9843 12.4
Table 4. Original optical system parameters
View tableView in ArticleTable 4. Original optical system parameters
Parameters 1 i j k P1 R(1) R(i) R(j) R(k) P2 dc(1) dc(i) dc(j) dc(k) P3 n(1) n(i) 1 1 P4 0 0 de(i) 0 P5 αg(1) αg(i) 0 0 P6 h(1) h(i) h(j) 0
Table 5. Materials of spacers
View tableView in ArticleTable 5. Materials of spacers
Serial number of spacer ring Material Spacer ring 1 AL6061 Spacer ring 2 AL6061 Spacer ring 3 Delrin 150 Spacer ring 4 TC4
Table 6. Focal length variation of the system after athermalization design
View tableView in ArticleTable 6. Focal length variation of the system after athermalization design
Temperature/℃ Focal length/mm Focal length variation/μm −20 23.9670 −4.9 −10 23.9682 −3.7 0 23.9694 −2.5 10 23.9706 −1.3 20 23.9719 0 30 23.9731 1.2 40 23.9744 2.5 50 23.9757 3.8 60 23.9770 5.1
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Xueqing HU, Zihan ZHAN, Guang JIN. Design method of focal length thermal stability for airborne image-space telecentric lens[J]. Infrared and Laser Engineering, 2025, 54(7): 20250182
Paper Information
Category: Optical design and fabrication
Received: Mar. 19, 2025
Accepted: --
Published Online: Aug. 29, 2025
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