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Laser Triangulation for Track Change and Defect Detection
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2020-03-01
[PDF-2.61 MB]
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Edition:Technical Report, March 2017-December 2017
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Abstract:Pavemetrics Systems Inc. teamed with Amtrak to demonstrate the feasibility of automated track change detection using its Laser Rail Inspection System (LRAIL). LRAIL is a rail inspection system based on the principle of laser triangulation and combines pulsed high-power, invisible, laser line projectors and synchronized cameras to capture a high-resolution-intensity image and 3-dimensional range profile of the railway trackbed. In this project, LRAIL was mounted on a hi-rail testing vehicle and tested at Amtrak’s Bear, DE facility and on mainline track. The LRAIL system includes a library of computer algorithms designed to make automatic measurements, inventory features, and detect changes in trackbed infrastructure. Pavemetrics researchers used algorithms to record and detect changes in fasteners, anchors, spikes, ties, joints, and ballast—as well as record rail manufacturing information. Field validation included the comparison of manual inspections with manual inspections considered "ground-truth." The primary outcome of this project was field-validated evidence of the technology’s ability to automatically detect changes in the track structure and highlight these changes for review and possible action.
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