Dynamic aberrations correction of Roll-Nod conformal seeker based on the diffraction surface and anamorphic asphere surface

Yunqiang Zhang; Jun Chang; Fanyang Dang; Xiaodong Bai; Guoqing Pan

doi:10.3788/COL202018.072201

Journals >Chinese Optics Letters >Volume 18 >Issue 7 >Page 072201 > Article

Chinese Optics Letters
Vol. 18, Issue 7, 072201 (2020)

Dynamic aberrations correction of Roll-Nod conformal seeker based on the diffraction surface and anamorphic asphere surface

Yunqiang Zhang^1、2, Jun Chang^1、*, Fanyang Dang^3、**, Xiaodong Bai², and Guoqing Pan²

Author Affiliations

¹School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China

²Aviation Key Laboratory of Science and Technology on Airborne Guided Weapons, Luoyang Optoelectro Technology Development Center, Luoyang 471009, China

³Key Laboratory of In-fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China

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DOI: 10.3788/COL202018.072201 Cite this Article Set citation alerts

Yunqiang Zhang, Jun Chang, Fanyang Dang, Xiaodong Bai, Guoqing Pan. Dynamic aberrations correction of Roll-Nod conformal seeker based on the diffraction surface and anamorphic asphere surface[J]. Chinese Optics Letters, 2020, 18(7): 072201 Copy Citation Text

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Fig. 1. Schematic diagram of a conformal optical system.

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Fig. 2. Amplitudes of Zernike coefficients of wavefronts passing through a conformal dome.

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Fig. 3. Arch corrector machined by OPTIMAX company.

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Fig. 4. Conformal seeker with an arch corrector. (a) 0° Roll and 45° Nod; (b) 30° Roll and 45° Nod.

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$Correcting method of dynamic aberrations based on the diffraction surface and anamorphic asphere surface.$

Fig. 5. Correcting method of dynamic aberrations based on the diffraction surface and anamorphic asphere surface.

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$Phase curve of diffraction surface after optimizing.$

Fig. 6. Phase curve of diffraction surface after optimizing.

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Fig. 7. Conformal optical system after optimizing. (a) 0° look angle; (b) 70° look angle.

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Fig. 8. Designed structure of conformal seeker.

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Fig. 9. Spot diagrams of the conformal system at different look angles. (a) 0°; (b) 30°; (c) 50°; (d) 70°.

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Fig. 10. MTF of the conformal system at different look angles. (a) 0°; (b) 30°; (c) 50°; (d) 70°.

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Term	Parameter Value
Material of dome	${MgF}_{2}$
Diameter $D$	135 mm
Fineness ratio F	1
Thickness at vertex $t_{1}$	3.8 mm
Entrance pupil diameter	35 mm
Field of view	$3 ° \times 3 °$
Field of regard	$\pm 70 °$
Design wavelength	$3 - 5 μ m$

Table 1. Design Parameters of Conformal Optical System

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Surface	Type	Radius	Thickness	Glass	Conic
1	Asphere	43.75	3.80	IRT1	−0.71
2	Asphere	21.40	32.20		−0.62
3	Asphere	255.26	2.82	Ge	−21.90
4	Asphere	164.53	2.20		26.28
5	Asphere	27.24	10.2	Si	−1.26
6	Asphere	52.91	5.18		−2.37
7	Asphere	19.23	3.08	Ge
8	Asphere	10.16	16.60		0.39
9	Anamorphic Asphere		−12.00	Mirror
10	Sphere	Infinity		Prism
11	Sphere	33.37	2.82	CaFL
12	Sphere	55.29	7.86
13	Asphere	27.84	3.15	Si	−0.73
14	Sphere	25.11	71.36
15	Sphere	1761.31	8.00	ZnSe
16	Asphere	−26.49	5.20		−1.40
17	Sphere	−656.83	8.45	Ge
18	Sphere	188.47	4.72
19	Sphere	Infinity	0.30	Ge
20	Sphere	Infinity	20.30
IMA	Sphere	Infinity