In dimensional measurements, it is required to specify uncertainty in the
measurement as the range of possible deviation for the measurement result. In this
thesis, a computer program is developed for evaluating uncertainty in
measurement of commonly used dimensional measuring devices like vernier
callipers, micrometers, comparators, and gauge blocks.
In evaluation of the uncertainty in measurement, some uncertainty sources
like temperature difference between the measured part and the instrument,
uncertainty in reference gauge block&rsquo / s dimension, mechanical effects, etc. are
considered. The program developed, employs the EAL, NIST and GUM
uncertainty evaluation equations as standard equations. However, the program can
also be used for other measuring instruments and the users can define their own
uncertainty equation. In the evaluations, for the standard uncertainty of the
variables considered, symmetric distributions are used.
The program gives the uncertainty budget and to compare the contribution
of each variable on the overall uncertainty of the measurement, the uncertainty
effect ratio is also given. In this thesis the evaluation process for uncertainty in measurement, the difference between the measurement error and uncertainty in
measurement and the structure of the program are discussed. Also, a set of
experiments has been made to illustrate the application of the program for
evaluating the measurement uncertainty of vernier callipers with 1/50 and 1/20
resolutions, digital vernier calliper and 25 mm micrometer.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12605976/index.pdf |
| Date | 01 April 2005 |
| Creators | Celebioglu, Emrah Hasan |
| Contributors | Akkok, Metin |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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