Surface Roughness Measurements of a Narrow Borehole — Development of Stylus with Cylindrical Mirror and Lensed Fiber

Abstract:

In various industrial fields, it is frequently necessary to measure surface roughness in confined spaces such as boreholes and grooves. However, using a small stylus, the surface roughness of a narrow borehole can be directly measured only a few millimeters from its end; alternatively, destructive measurements must be performed. This major disadvantage of conventional stylus-based surface profilometers is mainly due to an inductive pick-up that is connected to the stylus used to detect the surface roughness. In this paper, we propose a novel surface roughness measurement sensor. To make the surface roughness sensor small, we used a stylus with a cylindrical mirror and a lensed fiber instead of a conventional inductive pick-up. The proposed sensor converts the signal obtained by measuring the surface roughness of a borehole into an optical signal, which is transferred outside the borehole by an optical fiber. Experimental results demonstrate that this system has a measurement range of 8 μm and a sensitivity of 19 nm. Surface profiles were measured by the proposed sensor and by a conventional surface profiler and the results were found to be very similar.

• Periodical: Advanced Materials Research (Volume 939)
• Pages: 491-498
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.939.491
• Online since: May 2014
• Authors: Eiki Okuyama*, Wataru Yoshinari, Yuichi Suzuki, Riku Yoshida, Ichiro Yoshida, Masashi Iwakata
• Keywords: Borehole, Lensed Fiber, Surface Roughness Measurement

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