PTB-Certification for Interferometers
highest accuracy over long distances
Attocube’s interferometers have been tested by the National Metrology
Institute of Germany (PTB). The accuracy of the interferometers
has been confirmed at various pressure, humidity and temperature
conditions over several days, thus also confirming the high performance
and reliability of attocube’s ECU (environmental compensation unit).
The IDS was checked over a working distance of 10 meters. The systematic
error of measurement was quantified to 0.0 ppm between a working
distance of 0 m and 3 m. The total expanded measurement uncertainty
(k=2), consisting of the systematic and random measurement errors
mostly remains under 0.4 ppm.
4
Expanded Measurement Uncertainty (k = 2)
Average Systematic Error
Line of 0.4 ppm
3
2
1
0
0
2500
5000
7500
10000
Working Distance(mm)
The figure above shows the systematic measurement error and the measurement uncertainty of the IDS as
certified by the PTB. They depend on the working distance. The blue line represents a measurement error of
0.4 ppm that surrounds the other lines, while the average systematic error is always lower than 0.19 ppm.
Download the calibration certificate for the IDS/FPS at our website:
IDS certificate
FPS certificate