近年来,内窥镜广泛应用于不同环境下管道内壁疵病检测.针对不同口径炮管内壁高精度疵病检测需求,通过设计一款大视场、短焦距的广角内窥镜头,实现对Φ76～Φ155 mm 口径范围内炮管内壁的全景成像,确定内壁疵病位置.同时可以旋转整个镜头对炮管内壁进行侧视成像,实现对炮管内壁不同区域疵病0.5 mm的高精度测量.该系统基于Zemax设计软件,采用反远距物镜设计思路,利用非球面改善系统成像质量.最终实现光学系统视场为120°,焦距为2.5 mm,总长小于30mm,最大畸变值小于15％,在探测器截止频率84 lp/mm处全视场均大于0.3,且光学系统结构简单、适用口径范围广、有较好的成像质量,满足炮管内壁疵病检的要求.
Design of Gun Barrel Inner Wall Defect Detection System
In recent years,endoscopes have been widely used for the detection of internal defects in pipelines in various environments.This article focuses on the high-precision defect detection requirements of different calibers of gun barrels,a wide-angle endoscope lens with a large field of view and short focal length is designed.This lens achieves panoramic imaging of the internal walls of gun barrels within the caliber range of Φ76 mm to Φ155 mm,determines the position of internal defects,and allows the entire lens to rotate for side-view imaging of different areas of the inner walls,enabling high-precision measurement of defects.The system is designed using the Zemax design software based on the concept of a retro focal lens.Non-spherical surfaces are utilized to improve the imaging quality of the system.The final optical system achieves a field of view of 120°,a focal length of 2.5 mm,a total length of less than 30 mm,a maximum distortion value of less than 15％,and a full field of view greater than 0.3 at a detector cutoff frequency of 841p/mm.The optical system has a simple structure,a wide applicable caliber range,and good imaging quality,meeting the requirements for gun barrel defect detection.
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