Surface contour measurement using a short range laser displacement sensor

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Proceedings titleProceedings of the 20th International Solid Freeform Fabrication Symposium
Conference20th International Solid Freeform Fabrication Symposium, August 3-5 2009, Austin, Texas, USA
AbstractNon-contact freeform surface measurement is widely used in industry. To acquire the surface data, a laser displacement sensor and a motion system are typically used. One of the factors that affect the measuring accuracy is the sensor’s resolution. A high resolution sensor usually has a short measuring range. However, an unknown component’s profile with a large peak-to-valley height variation can not usually be measured using a short range sensor. We designed and developed a measuring system based on an existing 3-axis motion system with a laser displacement sensor mounted on its Z axis. This measuring system can be easily integrated to an existing laser processing system by standard communication ports to extend its applications into tool path planning, in-line inspection and monitoring. With the developed system, the real-time distance from the sensor to the component surface is acquired, and used as a feedback signal to control the sensor’s position on the Z axis to automatically maintain its distance with a given value. Through this development, the measuring range of the system is extended from the sensor’s measuring range up to the Z axis travelling range of the motion system so that a surface with large peak-to-valley height variation can be easily measured by a short range sensor with substantially improved accuracy.
Publication date
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NPARC number21274384
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Record identifiera07c1cd3-b9e8-49c2-93e6-ad5848e2e536
Record created2015-03-11
Record modified2016-05-09
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