engleski

Measurement uncertainty in calibration of measurement surface plates flatnes

A flat measurement surface e.g. a measurement plate, can be considered as the origin for performing most form and position measurements on measured objects. In order to use measurement plates in a proper way, it has to be assured that they are really flat and suitable for measurements. Flatness of measurement surface is determined indirectly by measuring the straightness of individual lines that build up the measurement grid. These lines are further divided into measurement steps that suit the dimensions of measuring instruments. Straightness of a measurement line is calculated for each line separately by measuring inclination of each measurement position, whereas flatness deviation of the entire surface is determined by linking the results of separate lines. Backgrounds, procedures and measuring equipment for performing such measurement are well known, whilst the uncertainty of measurement surface calibration remains undetermined. Without properly expressed uncertainty, a measurement means all but nothing. Therefore, a determination of measurement uncertainty has to be assured. This paper presented a new approach towards determining measurement uncertainty of flatness measurement, based on the Monte Carlo method. A complete measurement system is dissected into separate components, their amplitude and influence is evaluated, whilst measurements are simulated. Furthermore, an impact of grid parameters (size, density, number of measurement steps) on measurement result is evaluated as well.

production measurements; length measurements; measuring uncertainty; calibration;

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