METHOD OF CALIBRATION OF HIGH ACCURACY LINE STANDARDS WITH NOMINAL LENGTH BETWEEN 0.1 mm TO 1000 mm USING AN INTERFERENTIAL COMPARATOR UNCERTAINTY BUDGET

The paper describes the method used for the calibration of high accuracy line standards, using a modern installation named interferential comparator, unique in Romania and the estimation of errors which appear in measurement of line standards with interferential comparator. The contribution of the authors consist in the analyses of the sources of errors which appear during the measurement, due to the line standard, interferential comparator, electronic equipment and temperature, the estimation of the budget of measurement uncertainty, according to the specifications of "Guide to the expression of uncertainty in measurements, SR ENV 13005: 2003" and finding a better construction solution of interferential comparator for increasing the performances of measure of line standards, consisting in replacing of the optical microscope with a modern viewing microscope with CCD camera and soft for capture and analyze the image.