A simple line sensing method by laser line scanning for line scale measurement

Hongtang Gao; Xiaoyou Ye; Jianshuang Li

doi:10.1117/12.2015035

31 January 2013 A simple line sensing method by laser line scanning for line scale measurement

Hongtang Gao, Xiaoyou Ye, Jianshuang Li

Proceedings Volume 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation; 87591T (2013) https://doi.org/10.1117/12.2015035
Event: International Symposium on Precision Engineering Measurement and Instrumentation 2012, 2012, Chengdu, China

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.

Citation Download Citation

Hongtang Gao, Xiaoyou Ye, and Jianshuang Li "A simple line sensing method by laser line scanning for line scale measurement", Proc. SPIE 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation, 87591T (31 January 2013); https://doi.org/10.1117/12.2015035

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