TY - GEN
T1 - Evaluation of optical sensors for laser welding in a technical cognitive environment
AU - Lohaus, Lukas
AU - Bautze, Thibault
AU - Diepold, Klaus
PY - 2010
Y1 - 2010
N2 - Focal spot positioning and robot path control require online measurement of the distance between a welding head and the workpiece to be processed. For autonomously working applications, such as cognitive focal shift control, distance measurements can be used to teach coaxial video images at different distances. This paper compares optical sensors based on laser triangulation with those based on optical coherence tomography, which can be embedded in either pre- or post-process monitoring systems, thus allowing for accurate distance measurements. Because optical coherence tomography sensors are mainly used for medical purposes, their applicability in laser material processing was examined and verified. Using three workpieces with known geometrical properties, the lateral and depth resolution, and detectable angle dependency could be obtained. The advantages and limitations of the examined sensors are discussed here.
AB - Focal spot positioning and robot path control require online measurement of the distance between a welding head and the workpiece to be processed. For autonomously working applications, such as cognitive focal shift control, distance measurements can be used to teach coaxial video images at different distances. This paper compares optical sensors based on laser triangulation with those based on optical coherence tomography, which can be embedded in either pre- or post-process monitoring systems, thus allowing for accurate distance measurements. Because optical coherence tomography sensors are mainly used for medical purposes, their applicability in laser material processing was examined and verified. Using three workpieces with known geometrical properties, the lateral and depth resolution, and detectable angle dependency could be obtained. The advantages and limitations of the examined sensors are discussed here.
UR - http://www.scopus.com/inward/record.url?scp=78650405488&partnerID=8YFLogxK
U2 - 10.2351/1.5062015
DO - 10.2351/1.5062015
M3 - Conference contribution
AN - SCOPUS:78650405488
SN - 9780912035611
T3 - 29th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2010 - Congress Proceedings
SP - 1541
EP - 1546
BT - 29th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2010 - Congress Proceedings
PB - Laser Institute of America
ER -