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http://dx.doi.org/10.3807/KJOP.2005.16.3.177

Diameter Measurement of Cylindrical Objects by Non-Contact Method  

Im, Bok-Ryoung (Ulsan Technical High School)
Kim, Sok-Won (Department of Physics, University of Ulsan)
Publication Information
Korean Journal of Optics and Photonics / v.16, no.3, 2005 , pp. 177-181 More about this Journal
Abstract
Although there are many ways to measure the diameter of a cylindrical object, in this study, the diameter of a cylindrical objects were measured by the geometric optical method and interference-diffraction method which are two kinds of tipical non-contact methods. In geometric optical method, the curved laser beam is formed on the cylindrical surface by spreading the inclined laser beam using the cylindrical lens. The curve is captured by CCD camera and the diameter is calculated by geometry. And the interference and diffraction patterns of investigated cylindrical objects are analyzed in interference-diffraction method. In this study, the cylindrical objects, whose diameters are $0.05\;mm\;\~\;100.50\;mm$ were measured by the geometric optical method and interference-diffraction method. The results show that in each method, the relative errors of the measurement are within $2\%$ and $1\%$, respectively and these non-contact methods can be applied in the quick measurement of many objects.
Keywords
Cylindrical object; Diameter measurement; Non-contact method; Interference-diffraction; Babinet's principle;
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