Measuring instrument for space curve type long distance fine pipe internal surface shape and its detecting method

Abstract

The present invention discloses a space curve type long-distance microfine pipe internal surface form measurement instrument and its detection method. Said pipe internal surface form measurement instrument is formed from the components of 2-D position sensor, semiconductor laser, transparent window, micromotor, scanning lens, reflector, convergent lens and receiving lens group, etc. Said measurement instrument is applicable to defect detection and 3-D measurement of curve type microfine pipe internal wall whose inner diameter is 9-11 mm and curvature radius is greater than 100 mm, and its measuring accuracy can be up to plus or minus 0.1 mm.

Description

technical field [0001] The invention relates to a space curve type long-distance micro-pipe inner surface topography measuring instrument and a detection method. Background technique [0002] A large number of pipeline parts are used in many industries such as machinery, energy, chemical industry, etc. After long-term use, defects such as cracks may appear, which may cause gas or liquid leakage, damage the entire system, and cause unnecessary economic losses, and even endanger the lives of staff. Therefore, the detection of such parts has become a very important subject. Many literatures at home and abroad have done in-depth research on this issue, but most of them are for pipes with an inner diameter greater than 20mm, and there are few research reports for small pipes, especially those with an inner diameter of less than 10mm. [0003] The detection technology of the inner wall of large pipes is relatively mature. The most common method is to use a CCD camera to image th...

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