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Air index compensated interferometer as a prospective novel primary standard for baseline (CROSBI ID 225924)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Meiners-Hagen, Karl ; Bošnjaković, Alen ; Köchert, Paul ; Pollinger, Florian. Air index compensated interferometer as a prospective novel primary standard for baseline // Measurement science & technology, 26 (2015), 8; 084002/1-084002/8. doi: 10.1088/0957-0233/26/8/084002

Podaci o odgovornosti

Meiners-Hagen, Karl ; Bošnjaković, Alen ; Köchert, Paul ; Pollinger, Florian.

engleski

Air index compensated interferometer as a prospective novel primary standard for baseline

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.

absolute distance measurement ; refractive index compensation ; interferometry ; geodesy

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Podaci o izdanju

26 (8)

2015.

084002/1-084002/8

objavljeno

0957-0233

10.1088/0957-0233/26/8/084002

Povezanost rada

Fizika, Geodezija, Strojarstvo

Poveznice
Indeksiranost