一种用于机器视觉系统的双远心镜头设计

曹一青

一种用于机器视觉系统的双远心镜头设计

曹一青^{1, 2,}

1.
莆田学院机电与信息工程学院, 福建莆田 351100
2.
福建省激光精密加工工程技术研究中心, 福建莆田 351100

基金项目:

福建省自然科学基金项目 2020J01916

福建省中青年教师教育科研项目 JAT190590

福建省中青年教师教育科研项目 JAT190567

莆田市科技计划项目 2020GP004

莆田学院引进人才科研启动费项目 2019010

详细信息

作者简介:
曹一青（1987-），男，博士研究生，讲师，硕士生导师，主要从事光学系统成像分析及设计、光学检测技术等方面的研究。E-mail：caoyiqing1987@163.com

中图分类号: O435.2
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- 被引次数: 0
出版历程
- 收稿日期: 2021-11-08
- 修回日期: 2021-11-11
- 刊出日期: 2022-02-20

Design of Double Telecentric Lens Using Machine Vision System

CAO Yiqing^{1, 2
,}

1.
School of Mechanical and Electrical, Information Engineering, Putian University, Putian 351100, China
2.
Fujian Laser Precision Machining Engineering Technology Research Center, Putian 351100, China

摘要

摘要: 为了满足目前机器视觉工业在线检测提出的更高要求，本文给出了一种用于机器视觉系统的双远心镜头设计思路。首先，根据系统设计指标，确定较合适初始结构；然后，在双远心镜头成像原理和像差分析方法基础上，应用光学设计软件Zemax对系统像差反复优化设计，最终得到了一款具有高分辨率、低畸变及远心度小等特点的双远心镜头。该镜头系统由10片折射透镜组成，工作波长为400~700 nm，工作物距为100 mm，畸变小于0.07%，远心度最大不超过为0.06°，调制传递函数值在奈奎斯特频率77 lp/mm处均大于0.5，像差校正较好，满足系统设计要求。
- 光学设计 /
- 双远心镜头 /
- 远心度 /
- 畸变 /
- 像差校正
Abstract: This study presents a design idea for a double telecentric lens for machine vision systems to meet the industry requirements for the on-line inspection of machine vision. First, according to the design index of the system, a suitable initial structure is determined, and based on the imaging principle and aberration analysis method of the double telecentric lens, the aberration of the lens is then optimized repeatedly using the optical design software Zemax. Finally, a double telecentric lens with high resolution, low distortion, and small telecentricity is obtained. The lens system consists of 10 refraction lenses with an operating wavelength range 400–700 nm, a working object distance of 100 mm, distortion of less than 0.07%, maximum telecentricity of 0.06°, and modulation transfer function value greater than 0.5 at a Nyquist frequency of 77 lp/mm. The aberration correction is good and meets the design requirements of the system.
- optical design /
- double telecentric lens /
- telecentricity /
- distortion /
- aberration correction

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图 1 远心光路系统光路图

Figure 1. Optical scheme of telecentric optical path system

下载: 全尺寸图片幻灯片

图 2 优化后双远心镜头系统的结构图和光路图

Figure 2. Structure and optical path diagram of the optimized telecentric lens system

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图 3 优化后双远心镜头系统的调制传递函数（MTF）曲线图

Figure 3. Modulation transfer function curves of the optimized telecentric lens system

下载: 全尺寸图片幻灯片

图 4 优化后双远心镜头系统的点列图

Figure 4. Spot diagram of the optimized telecentric lens system

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图 5 优化后双远心镜头系统的场曲及畸变曲线

Figure 5. Filed curve and distortion curve of the optimized telecentric lens system

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表 1 双远心镜头光学系统主要技术指标

Table 1. Main technical indexes of telecentric lens optical system

Parameters	Value
Magnification	−0.397
Object space numerical aperture/mm	0.06
F number	3.3
Working wavelength/nm	400-700
Object space working distance/mm	100
Distortion/%	≤0.2
Telecentricity/°	≤0.1

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表 2 优化后双远心镜头系统的光学参数

Table 2. Optical parameters of optimized telecentric lens system

Surface	Radius/mm	Spacing/mm	Refractive index	Abbe number	Glass
Object plane	Infinity	100.00	-	-	-
1	53.63	20.00	1.54678	62.74	H-BAK3
2	−98.97	0.13	-	-	-
3	40.22	20.00	1.71736	29.51	H-ZF3
4	41.54	3.13	-	-	-
5	−48.94	3.50	1.60342	38.01	F1
6	29.07	25.26	-	-	-
Stop	Infinity	35.15	-	-	-
8	67.80	2.00	1.76842	49.29	D-LAF050
9	15.31	10.01	1.56907	71.31	H-ZPK7
10	−13.58	12.00	1.57503	41.30	QF3
11	−49.60	8.01	-	-	-
12	−26.93	10.00	1.67000	51.76	H-LAK67
13	−23.75	8.00	-	-	-
14	119.54	13.00	1.59280	68.35	H-ZPK5
15	−88.40	5.16	-	-	-
16	−32.10	12.00	1.50802	61.06	K4A
17	42.49	12.00	1.67103	47.28	H-ZBAF5
18	−87.16	42.38	-	-	-
Image plane	Infinity	-	-	-	-

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表 3 双远心镜头光学系统远心度

Table 3. Telecentric lens optical system telecentricity

Object Height	0H	0.3H	0.5H	0.7H	1H
Telecentricity/°	0.0149	0.0413	0.0558	0.0477	0.0459

下载: 导出CSV

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