高分辨率可视穿刺针光学系统的设计与研制

陈新华; 罗宗平; 杨惠林; 赵知诚; 沈为民

doi:10.37188/CO.2021-0001

高分辨率可视穿刺针光学系统的设计与研制

doi: 10.37188/CO.2021-0001

陈新华^{1, 2, ,},
罗宗平³,
杨惠林³,
赵知诚^{1, 2},
沈为民^{1, 2}

1.
苏州大学光电科学与工程学院教育部现代光学技术重点实验室，江苏苏州 215006
2.
苏州大学光电科学与工程学院江苏省先进光学制造技术重点实验室，江苏苏州 215006
3.
苏州大学医学部，江苏苏州 215006

基金项目: 江苏高校优势学科建设工程资助项目（PAPD）

详细信息

作者简介:
陈新华（1982—），男，江苏盐城人，博士，副研究员，2013年于苏州大学现代光学技术研究所获得光学工程博士学位，现工作于苏州大学光电科学与工程学院，主要研究方向为光谱成像系统和光学测试技术等方面。E-mail：xinhua_chen@suda.edu.cn

中图分类号: TH773
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- 被引次数: 0
出版历程
- 收稿日期: 2021-01-04
- 修回日期: 2021-02-22
- 网络出版日期: 2021-04-30
- 刊出日期: 2021-09-18

Design and development of the optical system for the high resolution visual puncture needle

1.
Key Lab of Modern Optical Technologies of Education Ministry of China, School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215006, China
2.
Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215006, China
3.
Medical College, Soochow University, Suzhou 215006, China

Funds: Supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

More Information

Corresponding author: xinhua_chen@suda.edu.cn

摘要

摘要: 为了实现穿刺过程中的精准定位，设计研制了一款视场角为90°，焦距为0.67 mm的高分辨率可视穿刺针光学系统。为使光学系统的光轴垂直于穿刺针的倾斜刃面，利用反射棱镜对光束进行转折，实现45°视向角。光学系统采用反远结构，并对初始结构参数的计算公式进行推导。经过优化设计后，系统成像质量接近衍射极限，最大光学元件尺寸小于1.5 mm。利用研制的光学系统和微型CMOS图像传感器，装配完成了一款直径为4 mm的可视穿刺针。对该可视穿刺针分别进行调制传递函数(MTF)测试和成像试验，测试结果表明，研制的光学系统具有较好的成像质量，物方分辨率优于18.03 lp/mm，能够实现清晰成像。
- 可视穿刺针 /
- 反远系统 /
- 视向角 /
- 调制传递函数
Abstract: In order to realize accurate positioning during the puncture surgery, a high-resolution optical system with a 90° field of view and 0.67 mm focal length is designed and developed for the visual puncture needle. A 45° viewing angle is chosen to make the optical axis perpendicular to the inclined edge surface by using a reflection prism. The retrofocus structure is used and the formulas for the initial structure parameters calculation are derived. The imaging performance of the optimized system is nearly diffraction-limited and the maximum size of the optical component is less than 1.5 mm. The optical system is developed, and it is assembled in a 4 mm diameter puncture needle with a miniature CMOS image sensor. The assembled visual puncture needle is evaluated with the Modulation Transfer Function (MTF) measurement and the imaging experiment. The measurement results show that the imaging quality of the optical system is good and its object-space resolution reaches 18.03 lp/mm, thus it can realize the requirement for high-resolution imaging.
- visual puncture needle /
- retrofocus system /
- viewing angle /
- modulation transfer function

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图 1 可视穿刺针的外观图

Figure 1. The appearance of the visual puncture needle

下载: 全尺寸图片幻灯片

图 2 光路结构

Figure 2. The structure of the optical system

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图 3 设计得到的光路结构

Figure 3. The optical layout of the designed optical system

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图 4 光学系统的点列图

Figure 4. The spot diagrams of the designed optical system

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图 5 光学系统的MTF曲线

Figure 5. The MTF curves of the designed optical system

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图 6 光学系统的相对照度曲线

Figure 6. The relative illumination curve of the designed optical system

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图 7 光学系统的畸变网格图

Figure 7. The distortion grid of the designed optical system

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图 8 可视穿刺针机械结构剖面图

Figure 8. The cross section of the visual puncture needle

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图 9 部分光学元件

Figure 9. Optical components used in the puncture needle

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图 10 装配完成的光学系统

Figure 10. The optical system after assembly

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图 11 可视穿刺针光学系统测试场景

Figure 11. Visual puncture needle measurement scene

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图 12 (a)拍摄的斜边图案及(b)光学系统的MTF测试结果

Figure 12. The captured slanted edge images (a) and the MTF measurement results (b) of the optical system

下载: 全尺寸图片幻灯片

图 13 （a）拍摄的双频环带图案和（b）棋盘格图案

Figure 13. The captured dual-frequency zone plate image (a) and the checkerboard image (b)

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表 1 主要参数的设计结果

Table 1. Optical parameters of designed optical system

Parameters	Value
Wavelength/μm	0.45~0.75
Focal length/mm	0.67
Field of view/(°)	90
F/#	4.6
Back focal length/mm	0.92
Working distance/mm	10
Magnification	0.0764
Image size/mm	0.7×0.7
MTF	≥0.2@246 lp/mm
Maximum component size/mm	≤1.5

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参考文献(13)

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