| Zugriffsnummer | 33241 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Air index compensated interferometer as a prospective novel primary standard for baseline calibrations |
| Autor(in); Institution |
Meiners-Hagen, Karl; 5.4, Interferometrie an Maßverkörperungen, PTB-Braunschweig
Bošnjakovic, Alen; Institut za mjeriteljstvo Bosne i Hercegovine (IMBiH), Sarajevo, BOSNIA AND HERZEGOVINA
Köchert, Paul; 5.2, Dimensionelle Nanometrologie, PTB-Braunschweig
Pollinger, Florian; 5.4, Interferometrie an Maßverkörperungen, PTB-Braunschweig
|
| Quelle/Jahr | Measurement Science and Technology: 26 (2015), 8, 084002-1 - 084002-8 |
| ISSN | 0957-0233 (PRINT) ; 1361-6501 (ONLINE) |
| DOI | |
| Verlag | Bristol: IOP |
| Konferenzangaben | 2nd MacroScale at Bundesamt für Eich- und Vermessungswesen: Recent developments in traceable dimensional measurements, Vienna, 28-30, October, 2014, Austria |
| Freie Schlagworte | absolute distance measurement ; refractive index compensation ; interferometry ; geodesy |
| Zusammenfassung | We describe the status of the development of an interferometer for absolute distance measurements with an intrinsic compensation of the refractive index of air, intended as a primary standard for the calibration of geodetic baselines. Two frequency-doubled Nd:YAG lasers are offset locked with a frequency difference of ≈20 GHz at the infrared 1064 nm fundamental wavelength. The resulting synthetic wavelengths of 15 mm for the infrared and 7.5 mm for the frequency-doubled green light are used as the scale for the measurements. Longer synthetic wavelengths are generated by acousto-optic frequency shifters. Based on the dispersion in air between green and infrared light the refractive index can be compensated. The attempt is demanding since uncertainties of the interferometric measurements for the optical wavelengths are scaled by a factor of nearly 300 000 in the refractive index compensated result. First comparisons up to 50 m length between this interferometer and a HeNe reference are presented. The deviations are smaller than ± 200 μm and dominated by a non-linearity from problems in the collimation of the measurement beams. In the linear parts the deviations are below ± 100 μm. |
Zitierung
Meiners-Hagen, K., Bošnjakovic, A., Köchert, P., & Pollinger, F. (2015). Air index compensated interferometer as a prospective novel primary standard for baseline calibrations. Measurement Science and Technology, 26(8), 084002-1–084002-8. https://doi.org/10.1088/0957-0233/26/8/084002