扫描式微透镜阵列系统的角放大率特性研究

苏晓琴; 杨童; 周岩; 穆郁; 杨磊; 谢洪波

扫描式微透镜阵列系统的角放大率特性研究

苏晓琴^1,,
杨童¹,
周岩²,
穆郁²,
杨磊^1, ,,
谢洪波¹

1.
天津大学精密仪器与光电子工程学院, 光电信息技术教育部重点实验室, 天津 300072
2.
天津津航技术物理研究所, 天津 300308

基金项目:

基础加强计划重点基础研究项目 2020JCJQZD06600

详细信息

作者简介:
苏晓琴（1997-），女，硕士研究生，主要从事微透镜阵列扫描、光学设计方面的研究。E-mail：suxqjy@tju.edu.cn

通讯作者:
杨磊（1982-），男，博士，副教授，主要从事光学设计、光电检测与成像方面的研究。E-mail：yanglei@tju.edu.cn

中图分类号: TN202
计量
- 文章访问数: 24
- HTML全文浏览量: 17
- PDF下载量: 4
- 被引次数: 0
出版历程
- 收稿日期: 2022-08-11
- 修回日期: 2022-12-05
- 刊出日期: 2024-04-20

Characterizing the Angular Magnification of Scanning Microlens Array System

SU Xiaoqin^1
,,
YANG Tong¹,
ZHOU Yan²,
MU Yu²,
YANG Lei^{1
, ,},
XIE Hongbo¹

1.
Key Lab of Optoelectronic Information Technology of Education Ministry of China, School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
2.
Tianjin Jinhang Institute of Technical Physics, Tianjin 300308, China

摘要

摘要: 扫描式微透镜阵列系统通过微动扫描成像，能够有效解决小行程与大视场之间的矛盾。扫描式微透镜阵列一般采用开普勒式望远结构，通过镜片横向相对位移实现视场扫描。本文提出了一种基于开普勒式望远结构的四片式微透镜阵列，探究了微透镜阵列的角放大率对于3~5 μm波段的扫描式微透镜阵列系统的影响。当角放大率小于1时，经过串扰产生的杂散光较多，系统的能量利用率上限受到限制，导致衍射极限受到限制。角放大率越大，能量利用率上限越高，当角放大率从0.67^×改变为0.83^×，能量利用率可以从43%提升到69%。当角放大率大于1时，系统的能量利用率不再受到结构限制，在抑制串扰的条件下，优化得到角放大率为1.5^×的结构。对其像质进行评价，各扫描视场RMS半径达到探测器像元尺寸，MTF达到0.6@17 lp/mm。角放大率作为表征微透镜阵列结构特点的参数，与系统能量利用率相关，从而影响像质，因此对于角放大率的分析与研究可为扫描式微透镜阵列系统的设计与实现提供依据。
- 微透镜阵列 /
- 光学扫描系统 /
- 杂散光 /
- 角放大率 /
- 能量利用率
Abstract: Scanning microlens array systems can effectively resolve the contradiction between small strokes and large fields of view using micromotion scanning imaging. They generally adopt the Keplerian telescope structure and perform field-of-view scanning through the relative lateral displacement of the lenses. In this paper, we propose a four-piece microlens array based on the Keplerian telescope structure and evaluate the effect of the angular magnification of the microlens array on the scanning microlens array system in the 3-5 μm band. When the angular magnification is less than 1, more stray light is generated after crosstalk and the upper limit of the energy utilization of the system is limited, resulting in a restricted diffraction limit. Higher angular magnifications increase the upper limit of energy utilization. When the angular magnification is changed from 0.67^× to 0.83^×, the energy utilization increases from 43% to 69%. When the angular magnification is greater than 1, the energy utilization of the system is no longer limited by the structure, and the structure with an angular magnification of 1.5^× is optimized under the condition of suppressing crosstalk. The results of the image quality evaluation are as follows: the RMS radius of each scanning field reaches the pixel size of the detector, and the MTF reaches 0.6@17l p/mm. As a parameter characterizing the structure of the microlens array, the angular magnification is related to the energy utilization of the system, which affects the image quality. Therefore, the analysis and study of angular magnification can provide a basis for the design and implementation of the scanning microlens array system.
- microlens array /
- optical scanning system /
- stray light /
- angular magnification /
- energy utilization

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图 1 扫描式微透镜阵列系统成像原理

Figure 1. Imaging schematic of scanning microlens array system

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图 2 串扰光线产生原理

Figure 2. The principle of crosstalk light generation

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图 3 焦距f₁'≥f₂'的结构

Figure 3. Structure with focal length f₁'≥f₂'

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图 4 大视场光路图：(a) 加入场镜前；(b) 加入场镜后

Figure 4. Large field of view optical path diagram: (a) Before adding field lens; (b) After adding the field lens

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图 5 MLA三片式结构。(a) θ＝0°; (b) θ＝10°

Figure 5. MLA three-piece structure. (a) θ=0°; (b) θ=10°

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图 6 MLA四片式结构。(a) θ＝0°; (b) θ＝10°

Figure 6. MLA four-piece structure. (a) θ=0°; (b) θ=10°

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图 7 红外物镜结构

Figure 7. Infrared objective structure

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图 8 后光阑结构。(a) θ＝0°; (b) θ＝10°

Figure 8. Rear aperture structure. (a) θ=0°; (b) θ=10°

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图 9 能量利用率与角放大率的关系

Figure 9. Relationship between energy utilization and angular magnification

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图 10 前光阑结构。(a) θ＝0°; (b) θ＝10°

Figure 10. Front diaphragm structure. (a) θ= 0°; (b) θ=10°

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图 11 角放大率1.5^×结构的点列图

Figure 11. Spot diagram of a structure with an angular magnification of 1.5^×

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图 12 各扫描视场的惠更斯MTF。(a) θ＝0°; (b) θ＝4.24°; (c) θ＝7.07°; (d) θ＝10°

Figure 12. Huygens MTF for each scanning field of view. (a) θ=0°; (b) θ=4.24°; (c) θ=7.07°; (d) θ=10°

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图 13 微透镜阵列大视场光路

Figure 13. Large field of view optical path of microlens array

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表 1 系统参数

Table 1. System parameters

System parameters	Value
Waveband	3−5 μm
Scan field of view	±10°
Total clear aperture	35 mm
Unit clear aperture	0.7 mm
Detector size	9.6 mm×7.68 mm
Resolution	320×256
F #	2

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