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4 February 1999 Noncontact real-time measurement of surface roughness inside cylinders
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The MLS method for measuring surface roughness (rms roughness RQ in the range 1 - 200 microns) is reviewed for the usual case of a nominally planar target surface. Application is then made to surfaces with cylindrical curvature, as would be found typically in examining the inner surfaces of bored or drawn cylinders. It is shown that the MLS algorithm for determining RQ from image data needs no geometrical correction in the often desired special case when the MLS instrument's Ronchi ruling has its grid lines oriented tangential to the cylinder's curvature (i.e., lines perpendicular to the cylinder's axial direction). Corrections for other cases are small for cylinders with inside diameters greater than 50 mm, and are easily handled in software. Folding of the optical system of the MLS method is illustrated, to provide a surface sensing probe that can be inserted in rough cylinders, e.g., for monitoring the progress of grinding operations.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John N. Pike and Yogesh Mehrotra "Noncontact real-time measurement of surface roughness inside cylinders", Proc. SPIE 3589, Process Control and Sensors for Manufacturing II, (4 February 1999);


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