光学学报, 2020, 40 (9): 0912001, 网络出版: 2020-05-06  

行波管螺旋线的光学检测方法 下载: 966次

Optical Measurement Method for a Traveling Wave Tube Helix
作者单位
中国科学院空天信息创新研究院, 北京 101407
摘要
为解决行波管螺旋线(TWT)测量中存在的效率低和结果不稳定的问题,发展了一种高效的光学检测方法,主要包括:选取基于双标准棒滚动的螺旋线摆放与调整装置,使零件的旋转角度可控,摆放直线度优于0.01 mm;采用直线取景器有效避免了毛刺、翻边等缺陷的干扰,增加了自动寻边过程的稳定性,测量结果重复性优于0.8 μm;基于45°直角棱镜开发了端口处内径测量系统,获得了对比度鲜明的成像效果;基于激光共聚焦显微镜测量了螺旋线外表面粗糙度,得到了与工艺规律相吻合的数据;将分段阵列的编程策略和交点距离的算法应用到变螺距螺旋线检测中,具有较高的操作效率和灵活性,单根螺旋线的检测时间缩短为传统方式的三分之一。该结果对于提高螺旋线行波管产品的合格率、实现其批量化生产具有重要意义。
Abstract
A high-efficiency optical method was developed to solve the problems of measurement inefficiency and instability in the helix of a traveling wave tube (TWT). This method offers several improvements over existing methods. First, a device for helix placement and adjustment based on double standard bar rolling was chosen to make the rotation angle of the parts controllable and the placement straightness within 0.01 mm. Second, a linear viewfinder was used to effectively increase the stability of the automatic edge finding process by avoiding burr and overturn interference; the repeatability of the measurement results was better than 0.8 μm. Next, a port inner diameter measurement setup based on a 45° rectangular prism was developed to obtain a distinct contrast imaging effect, and the helix’s outer surface roughness was measured using a laser confocal microscope; the measurement results were in good agreement with those in process law. Finally, high efficiency and flexibility was achieved by applying a segmented array programming strategy and intersection distance algorithm for the detection of the stepping pitch helix; the detection time for a single helix reduced to one-third that of the existing method. These results are of great significance for improving the qualification rate of helical TWT products and realizing their batch production.

王建, 李飞, 方有维. 行波管螺旋线的光学检测方法[J]. 光学学报, 2020, 40(9): 0912001. Jian Wang, Fei Li, Youwei Fang. Optical Measurement Method for a Traveling Wave Tube Helix[J]. Acta Optica Sinica, 2020, 40(9): 0912001.

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