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Proceedings Paper

Studies on laser dynamic precision measurement of fine-wire diameters
Author(s): Liangbi Bao; Fuyao Chen; Shixiong Wu; Jiangtong Xu; Zhilian Guan
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Paper Abstract

A new way of precise measurement of moving object is described in this paper. Using Laser-Fourier Transformation-CCD System and computer (for real-time processing) We realized the dynamic measurement of tungsten filament etc.under the real-time si- tuation, and measuring results have been achieved of linear-diameter range 1O-2OOm, the precision 0.5% and the velocity O-l5OmImin. Though the static precision measurement of fine wire diameter has been well re- solved in scientific research and industrial applications, the precision measuremeit of a moving fine wire is still a rather difficult problem. There are two kinds of dynamic measurement of fine wire now: One is the light spot scanning method, with a parallel beam scanning across a wire and a phototube receiving the light singnal op- posite, the diameter of wire from 5Opm to several millimeters can be measured; the other is to measure the shadow of fine wire with a CCD ( charge coupled device ), the measuring range is about 0.5-30mm. These two methods can measure fine wire dy- namically, but their accuracies are 1,ow and measuring ranges are limited. They are not suited to measure thinner wires for too big error. It is often necessary to measure dynamically wires thinner than 50 Itm with high precision in industry practice, such as tungsten filament using in bulb factories, which diameters are from 8 to 40 im. The above methods aren't suitable. Now in some factories the weight method is used to measure fine wire diameters but it can only obtain the mean value but not the real value of diameters, so it affects seriously the quality of bulbs. The new method of dynamic precision measurement we studied is to measure the power spectrum of a fine wire with a CCD, and process data with a micro-computer at real time. Satisfacory results have been achieved.

Paper Details

Date Published: 1 January 1991
PDF: 6 pages
Proc. SPIE 1332, Optical Testing and Metrology III: Recent Advances in Industrial Optical Inspection, (1 January 1991); doi: 10.1117/12.51138
Show Author Affiliations
Liangbi Bao, Hefei Univ. of Technology (China)
Fuyao Chen, Hefei Univ. of Technology (China)
Shixiong Wu, Hefei Univ. of Technology (China)
Jiangtong Xu, Hefei Univ. of Technology (China)
Zhilian Guan, Hefei Univ. of Technology (China)

Published in SPIE Proceedings Vol. 1332:
Optical Testing and Metrology III: Recent Advances in Industrial Optical Inspection
Chander Prakash Grover, Editor(s)

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