Acta Optica Sinica, Volume. 33, Issue s1, 112006(2013)
Laser Dual-Triangulation for Groove Profile
Laser triangulation system with single imaging lens is not suitable for measuring the groove profile. Diffuse reflected light of illumination point on object surface is blocked by steep groove edges and a measurement blind zone is formed, because the projection axis and the imaging axis are in a certain angle. To solve this problem, a laser dual-triangulation system based on the laser triangulation method with Scheimpflug condition is developed for groove profile measurement. The autoregulation of integral time of image spot detector and the digital filtering of image intensity data are discussed. Extraction of image spot center and discriminance of imaging point due to imaging beam shaded by groove edge are also studied. The dual-triangulation mapping relationship is determined by calibration experiment. The compressive deformation measurement of tread profile indicates the validity of this system and the measurable depth-to-width ratio of the groove profile is more than or equal to 5 mm.
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Liu Hengbiao, Liu Chenglin, Ge Jianmin. Laser Dual-Triangulation for Groove Profile[J]. Acta Optica Sinica, 2013, 33(s1): 112006
Category: Instrumentation, Measurement and Metrology
Received: Nov. 12, 2012
Accepted: --
Published Online: Jun. 7, 2013
The Author Email: Hengbiao Liu (liuhb62@tongji.edu.cn)