METROLOGY - RTC, Regional Training Centre - Turkey
METROLOGY - RTC, Regional Training Centre - Turkey
METROLOGY - RTC, Regional Training Centre - Turkey
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<strong>METROLOGY</strong><br />
Example:<br />
The meter is defined as the length of the path travelled by light in<br />
vacuum during a time interval of 1/299 792 458 of a second. The<br />
meter is realized at the primary level in terms of the wavelength<br />
from an iodine-stabilised helium-neon laser. On sub-levels,<br />
material measures like gauge blocks are used, and traceability is<br />
ensured by using optical interferometry to determine the length of<br />
the gauge blocks with reference to the abovementioned laser<br />
light wavelength.<br />
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