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Proceedings Paper

A simple line sensing method by laser line scanning for line scale measurement
Author(s): Hongtang Gao; Xiaoyou Ye; Jianshuang Li
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Paper Abstract

Line sensing is key for line scale measurement. Different methods for line sensing are suited to different Line Scales. Line sensing methods such as CCD microscope and slit photoelectric microscope currently mainly used in the world are introduced. This paper presents a new method based on laser line scanning technique, which is widely used in laser bar code scanner. The basic sensing principles, the precision can be obtained with different methods and the advantages and disadvantages of the methods are also discussed. An experiment device based on laser line scanning was built to measuring the ordinary line scale such as square rules, steel tapes. In order to get a good reproducibility for line sensing, the line signal processing is studied. The line position is calculated as mass center of certain areas above minimum value of each line signal, the experiment result shows that when measuring 1mm interval of an ordinary steel ruler in scanning interval 10μm, the reproducibility is less than 1μm.

Paper Details

Date Published: 31 January 2013
PDF: 7 pages
Proc. SPIE 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation, 87591T (31 January 2013); doi: 10.1117/12.2015035
Show Author Affiliations
Hongtang Gao, National Institute of Metrology (China)
Xiaoyou Ye, National Institute of Metrology (China)
Jianshuang Li, National Institute of Metrology (China)


Published in SPIE Proceedings Vol. 8759:
Eighth International Symposium on Precision Engineering Measurement and Instrumentation
Jie Lin, Editor(s)

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