非接触光电窥测仪瞄准及定位方法研究

在非接触光电窥测仪的设计中需要解决两个基本问题：一是如何通过特殊的光学手段把在内孔狭小空间中的被测信息提取出来；二是如何进行测头定位来解决测量基准问题。本文报导了我们设计的非接触光电窥测装置的工作原理。通过方案比较，提出了以图像位置偏移作为瞄准判据及５ 步定位方法，分析了它们的精度及灵敏度

Focusing and orientation of the optical head in non-contact optoelectronic spy testing equipment

There exist two basic problems in design non contact optoelectronic instrument for testing hole like work pieces, such as inner thread、 hollow joint、 thin pipe etc. One is how to obtain the useful geometrical feature on the inner surface of the space limited hole by a special optical system; the other is how to focus and orientate the optical head for measuring parameters accurately. A scheme for spy quantitative testing system is presented in this paper, in which a line shape sectioning light is projected on the inner surface with an angle and with its line parallel to the pipe axis, the deformed line is recorded by a CCD camera and captured into a computer, therefore the parameters can be got from the geometrical feature in the picture by image processing. A focusing rule based on image position deviation judgment and a five step orientating approach are put forward in comparison with other methods by the analyses of accuracy and sensitivity respectively.