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13 January 2005 The optoelectronic automeasuring system of wheel set comprehensive parameters
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The measuring of geometrical profile and tread defects of wheel set is an important step for the safety of train vehicle running. The paper researched an automatic measuring system of comprehensive parameters of wheel set based on optoelectronic detecting technique. The system used precision laser displacement sensor, digital image processing and motion control technology to realize the non-contact automatic measuring of wheel set parameters. The tread and flange profile were captured using laser source and high resolution CCD sensor. The image SNR was gained through narrow band-pass optical filters which wavelength matched with laser source. In order to detect the irregular tread failures formed in running of train vehicle, the paper used precision laser displacement sensor to scan the tread and acquire the position while the wheel set was rotating slowly. The displacement data of different positions were transformed to digital image. Then digital image processing and mode recognition algorithm was used to distinguish and judge the failures. The repeatability and accuracy of the system can meet the demand of wheel set maintaining.
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Kaihua Wu, Kuang Yan, and Zuohua Huang "The optoelectronic automeasuring system of wheel set comprehensive parameters", Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005);

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