American Journal of Engineering and Applied Sciences

Uncertainty and its Impact on the Quality of Measurement

Adel Elahdi M. Yahya and Martin Halaj

DOI : 10.3844/ajeassp.2012.114.118

American Journal of Engineering and Applied Sciences

Volume 5, Issue 2

Pages 114-118

Abstract

The imposition of practice, the current world, the laboratory measurement, calibration should be approved by points of credit to national or international and should be compatible with the requirements specification (ISO 17025) for the adoption of efficient laboratories. Those requirements were included the testing process or scale limits to doubt that mentioned in the measurement certificate, which recognizes the customer to achieve quality and efficiency in the process of measurement. In this study we would theoretically try to clarify, indicate what the uncertainty in the measurement, standard types of uncertainty and how to calculate the budget of uncertainty as we should show some examples of how the scientific calculation of the budget challenge with some measure the lengths of the laboratory. After analyzing the results we had found during the measurement using CMM, we had found that the value of non-statistical uncertainty in the measurement type (b) piece length of one meter was ±1.9257 µm. and when using the configuration measuring device, we had gotten the value of the extended standard combined uncertainty ±2.030 µm when measured the screws value of 1.2707 mm. When used the configuration measuring device, we had gotten the value of the extended standard combined uncertainty ±2.030 µm when measuring the screws value of 1.2707 mm. We concluded that the impact of uncertainty on the measured results a high fineness degree and less impact on the smoothness of a piece with low fineness, careful calibration of measuring instrument Careful calibration of measuring instrument and equipment by measurement standard is of the utmost importance and equipment by measurement standard is of the utmost importance and laboratories must calculate the uncertainty budget as a part of measurement evaluation to provide high quality measurement results.

Copyright

© 2012 Adel Elahdi M. Yahya and Martin Halaj. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.