高波前拟合精度的紧凑型音圈变形镜

胡立发; 姜律; 胡启立; 徐星宇; 黄杨; 吴晶晶; 俞琳

doi:10.37188/CO.EN-2023-0001

高波前拟合精度的紧凑型音圈变形镜

胡立发^{1, 3,},
姜律^{1, 3},
胡启立²,
徐星宇^{1, 3},
黄杨^{1, 3, ,},
吴晶晶^{1, 3},
俞琳^{1, 3}

1.
江南大学理学院, 江苏无锡 214122
2.
光电对抗测试与评估重点实验室, 河南洛阳 471003
3.
江苏省轻工光电工程技术研究中心, 江苏无锡 214122

详细信息

中图分类号: TH74
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出版历程
- 收稿日期: 2023-01-10
- 修回日期: 2023-03-09
- 网络出版日期: 2023-05-10

Compact voice coil deformable mirror with high wavefront fitting precision

doi: 10.37188/CO.EN-2023-0001

HU Li-fa^{1, 3
,},
JIANG Lv^{1, 3},
HU Qi-li²,
XU Xing-yu^{1, 3},
HUANG Yang^{1, 3
, ,},
WU Jing-jing^{1, 3},
YU Lin^{1, 3}

1.
School of Science, Jiangnan University, Wuxi 214122, China
2.
Key Laboratory of Electro-Optical Countermeasures Test & Evaluation Technology, Luoyang 471003, China
3.
Jiangsu Provincial Research Center of Light Industrial Opto-electronic Engineering and Technology, Wuxi 214122, China

Funds: Supported by National Natural Science Foundation of China (No. 61475152); Fund for Key Laboratory of Electro-Optical Countermeasures Test & Evaluation Technology (No. GKCP2021001)

More Information

Author Bio:
HU Li-fa (1974—), male, born in Wuhan, Hubei Province, Ph.D., researcher and doctoral supervisor, obtained a doctorate degree from Northeastern University in 2003, is mainly engaged in liquid crystal adaptive optics research. E-mail：hulifa@jiangnan.edu.cn

HUANG Yang (1988—), male, born in Nantong, Jiangsu Province, Ph.D., associate professor and master supervisor, obtained a doctorate degree from Soochow University in 2016, is mainly engaged in adaptive optics technology and application research. E-mail：yanghuang@jiangnan.edu.cn

Corresponding author: yanghuang@jiangnan.edu.cn

摘要

摘要:
为了满足小型化自适应光学系统校正波前畸变的需求，基于系统理论分析设计了一种使用微型音圈驱动器的变形镜。使用电磁理论和有限元方法优化了微型音圈驱动器的结构参数。从热变形、共振频率、耦合系数等多个参数的角度对变形镜进行了优化。最后根据影响函数完成了波前拟合和残差计算。优化后的69单元紧凑型音圈变形镜具有大相位调制量、良好的热稳定性，第一共振频率为2220 Hz。对于PV值为1 µm的前35项泽尼克模式，紧凑型音圈变形镜的拟合残差均小于30 nm。对于复杂随机像差，紧凑型VCDM能够将波前RMS降至原来的10%以下。结果表明，与传统的音圈变形镜相比，紧凑型音圈变形镜具有更高的波前拟合精度。高性能、低成本的紧凑型音圈变形镜在视网膜成像和机载成像系统中具有良好的应用前景。
- 自适应光学 /
- 变形镜 /
- 音圈驱动器 /
- 多参数分析
Abstract:
To meet the requirements of wavefront distortion correction for miniaturized adaptive optics systems, a Deformable Mirror (DM) using micro voice coil actuators was designed based on systematic theoretical analysis. The structural parameters of the micro voice coil actuator were optimized by electromagnetic theory and the finite element method. The DM was optimized with respect to thermal deformation, resonance frequency, coupling coefficient and other parameters. Finally, wavefront fitting and residual calculation were completed according to the influence function. The optimized 69-element Voice Coil Deformable Mirror (VCDM) has a large phase stroke, good thermal stability, and a large first resonance of 2220 Hz. The RMS of the fitting residuals of the VCDM for the first 35 Zernike modes with a PV value of 1 μm are all below 30 nm. For complex random aberrations, the compact VCDM can reduce the wavefront RMS to less than 10%. Compared with a traditional VCDMs, the results of our compact VCDM indicate that it has a higher wavefront fitting precision. The compact VCDM with high performance and low cost has good potential applications in human retinal or airborne imaging systems.
- adaptive optics /
- deformable mirror /
- voice coil actuator /
- multiparameter analysis

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Figure 1. Structure of micro VCA

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Figure 2. Structure of VCDM. (a) Sectional view; (b) arrangement of VCAs

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Figure 3. Magnetization directions of the permanent magnet. (a) Axial magnetization, (b) parallel magnetization, (c) radial magnetization

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Figure 4. Electromagnetic force as a function of current for the permanent magnet at different magnetization directions

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Figure 5. Force and efficiency as a function of the VCA’s structural parameters: (a) permanent magnet radius; (b) permanent magnet height; (c) coil inner diameter; (d) coil outer diameter; (e) coil height; (f) air gap

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Figure 6. Electromagnetic force and efficiency as a function of current (Circle line, before optimization; pentagram line, after optimization)

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Figure 7. The thermal analysis process of the VCDM

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Figure 8. Temperature and thermal deformation of the VCDM’s thin mirror as a function of current. (a) The temperature of the thin mirror as a function of current. The inset shows the temperature chart of the thin mirror when the current is 0.1 A. (b) The thermal deformation chart of the mirror surface as a function of current. The inset shows the deformation chart of the thin mirror when the current is 0.06 A

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Figure 9. Relationship between first resonance frequency of the DM and mirror thickness under different spring's stiffnesses

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Figure 10. Relationship between coupling coefficient of the DM and mirror thickness under different spring's stiffnesses

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Figure 11. Correction ability varying with the coupling coefficient

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Figure 12. The influence function of S1

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Figure 13. Wavefront fitting results of S1 for a single Zernike mode

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Figure 14. The wavefront fitting results of S1 for complex random aberrations. From left to right, there is the original wavefront, the fitting wavefront and the residual wavefront

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Table 1. Parameters for micro VCAs to be optimized

Parameters	Values(mm)	Step
Magnet radius r_m	0.1≤r_m≤1.1	0.1
Magnet height h_m	0.05≤h_m≤1	0.05
Coil inner diameter d_c-in	0.2≤d_c-in≤1	0.2
Coil outer diameter d_c-out	0.4≤d_c-out≤2.2	0.2
Coil height h_c	0.1≤h_c≤1	0.1
Air gap h_g	50≤h_g≤100	10

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Table 2. Material parameters uesd in thermal analysis

Material	Thermal conductivity	Coefficient of thermal expansion	Density	Young’s Modulus	Poisson’s Ratio
Material	[W/m/ °C]	[/ °C]	[kg/m³]	[Pa]	[/]
CP1 Polyimide	0.25	5.1×10⁻⁵	1540	2.1×10⁹	0.34
316 Stainless Steel	13.44	1.478×10⁻⁵	7954	1.95×10¹¹	0.25
Epoxy	0.294	1.688×10⁻⁵	1900	2.64×10¹⁰	0.1543
NdFe35	7.7	3.2×10⁻⁶	7450	1.6×10⁸	0.24
Copper	112.1	1.999×10⁻⁵	8267	9.995×10¹⁰	0.345
Aluminum Alloy	114	2.3×10⁻⁵	2770	7.1×10¹⁰	0.33

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