Abstract
This paper deals with invention of a new measurement principle for straightness profile measuring instrument based on numerical software datum. The novel sequential two-point method was realized using a twin heads displacement sensor and a shifting reference plate in the lateral direction. Utilizing a precise level meter for correction of the reference plate slope, a long distance straightness profile can be measured in an extrapolative way. Uncertainty analysis on designed specifications of the measuring instrument assured its high accuracy and practicality. The experimental variation of straightness profiles measured by a developed measurement system was in a good agreement with the numerical simulation.
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