近年来，内窥镜广泛应用于复杂环境下小尺寸零件缺陷检测，该文设计一种用于航空发动机叶片检测的工业内窥镜光学系统。系统基本结构采用二次成像，物镜采用非对称反远距结构，将大视场光线收束进小口径腔体中，适配镜将物镜所成一次实像放大21倍，后接对角线长42 mm高速相机。系统基于Zemax设计软件进行系统优化、公差分析和像质评价，最终系统具有大视场（120°）、细孔径（3 mm）、耐高温（25 ℃~180 ℃）等特点。由于对视场、孔径和适配镜放大率有较高要求，因此合理引入非球面提高系统成像质量，入瞳直径提高至0.5 mm，系统空间截止频率在17 lp·mm−1处，全视场调制传递函数值均大于0.28，最大畸变值小于21.2 %。
Abstract
In recent years, the endoscope is widely used in defect detection of small-size parts in complex environment. An industrial endoscope optical system was designed for aero-engine blade detection. The basic structure of the lens adopted secondary imaging, and the objective lens adopted asymmetrical inverse distance structure, which beamed the large field of view light into the small caliber cavity. The adaptor lens was adapted to the high speed camera in which the diagonal length was 42 mm, and it could magnify the intermediate image 21 times. The system was based on Zemax design software for system optimization, tolerance analysis and image quality evaluation, and finally the system realized the optical properties of large field of view (120°), small caliber (3 mm) and high temperature resistance (25 ℃～180 ℃). Due to the higher requirements of the field of view, caliber and adaptor magnification, the aspherical surface was reasonably introduced to improve the imaging quality of the system. The entrance pupil diameter was increased to 0.5 mm, the system spatial cut-off frequency was at 17 lp·mm−1, the full-field modulation transfer function value was greater than 0.28, and the maximum distortion value is less than 21.2%.
关键词
工业内窥镜 /
小口径 /
大视场 /
光学设计
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Key words
optical design /
industrial endoscope /
large field of view /
small caliber
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