The field of surface finish or surface roughness measurement has seen a number of recent tools investigated using the properties of how a laser beam scatters off of a part surface. These approaches included laser speckle correlation, reflectance distribution, fringe contrast, and correlations techniques to name a few. Few of these methods have seen extensive application in industry to date. One of the challenges of developing this type of tool is correlating the data with currently accepted practices, such as the stylus gage. Other optical based methods, such as interferometry and surface following, have seen some degree of success in addressing this issue. 1bis paper will review the range of optical surface roughness techniques currently available, then explore in more detail some of the difficulties associated with interpreting and using the laser scattering surface finish measurement techniques. Finally, we suggest a few methods by which it may be possible to make use of these laser scattering methods for high speed applications.
Topics
Interferometry
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1992
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