Počet záznamů: 1

Suppression of Air Refractive Index Variations in High-Resolution Interferometry

  1. 1.
    0368382 - UPT-D 2012 RIV CH eng J - Článek v odborném periodiku
    Lazar, Josef - Číp, Ondřej - Čížek, Martin - Hrabina, Jan - Buchta, Zdeněk
    Suppression of Air Refractive Index Variations in High-Resolution Interferometry.
    Sensors. Roč. 11, č. 8 (2011), s. 7644-7655 ISSN 1424-8220
    Grant CEP: GA ČR GA102/09/1276; GA ČR GPP102/11/P820; GA AV ČR KAN311610701; GA MŠk(CZ) LC06007
    Výzkumný záměr: CEZ:AV0Z20650511
    Klíčová slova: refractometry * nanopositioning * interferometry * nanometrology
    Kód oboru RIV: BH - Optika, masery a lasery
    Impakt faktor: 1.739, rok: 2011

    The influence of the refractive index of air has proven to be a major problem on the road to improvement of the uncertainty in interferometric displacement measurements. We propose an approach with two counter-measuring interferometers acting as a combination of tracking refractometer and a displacement interferometer referencing the wavelength of the laser source to a mechanical standard made of a material with ultra-low thermal expansion. This technique combines length measurement within a specified range with measurement of the refractive index fluctuations in one axis. Errors caused by different position of the interferometer laser beam and air sensors are thus eliminated. The method has been experimentally tested in comparison with the indirect measurement of the refractive index of air in a thermal controlled environment. Over a 1 K temperature range an agreement on the level of 5 x 10(-8) has been achieved.
    Trvalý link: http://hdl.handle.net/11104/0202743