The Classification of Machined Surfaces Using Scattered White and Coloured Light
The finish and texture of manufactured surfaces are critical to performance since the majority of functional failures start at the surface. Thus, correct surface finish assessment has implications for product liability. Conventionally, the surface finish of manufactured surfaces is measured by contacting profilometry. For in-process measurements this is too slow. In this paper, a method is described where scattered white light can be analysed to define surface finish, lay and texture. This is novel, previously there have been no methods available to separate different manufacturing surfaces with the same surface finish. Under certain circumstances light is reflected in such a way as to produce colour changes in the scattered light blob. This paper describes the light scattering analysis methodologies based on the assessment of the three-dimensional light scatter blob.
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