22 May 2003 Machine vision technique for measuring glass container thickness
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The inspection of sidewall thickness provides important information about the production processes for glass container manufacture. By monitoring the thickness profile around the perimeter of bottles in real-time, the manufacturing process can be altered to produce higher quality products. This also provides the ability to identify and remove defective products. In order to improve the speed and accuracy of inspections, a new non-contact method for acquiring thickness profiles of glass bottles that employs optical and machine vision techniques has been developed and tested. One of the fundamental laws of optics, Snell's Law, is the basic concept upon which the inspection technique relies. The thickness of a flat plane of transparent material can be determined from Snell’s Law with a single beam of light that passes through the medium, reflects off the secondary surface, and travels back to the initial surface and passes through it. Based upon this principle, a new non-contact glass thickness measurement technique has been developed and it has demonstrated good accuracy.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ralph M. Ford, Jeffrey A. Mercier, "Machine vision technique for measuring glass container thickness", Proc. SPIE 5011, Machine Vision Applications in Industrial Inspection XI, (22 May 2003); doi: 10.1117/12.474071; https://doi.org/10.1117/12.474071

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