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Sensors 2011, 11(8), 7644-7655; doi:10.3390/s110807644
Article

Suppression of Air Refractive Index Variations in High-Resolution Interferometry

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Received: 16 June 2011; in revised form: 23 July 2011 / Accepted: 24 July 2011 / Published: 2 August 2011
(This article belongs to the Section Physical Sensors)
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Abstract: 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 × 10−8 has been achieved.
Keywords: refractometry; nanopositioning; interferometry; nanometrology refractometry; nanopositioning; interferometry; nanometrology
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Lazar, J.; Číp, O.; Čížek, M.; Hrabina, J.; Buchta, Z. Suppression of Air Refractive Index Variations in High-Resolution Interferometry. Sensors 2011, 11, 7644-7655.

AMA Style

Lazar J, Číp O, Čížek M, Hrabina J, Buchta Z. Suppression of Air Refractive Index Variations in High-Resolution Interferometry. Sensors. 2011; 11(8):7644-7655.

Chicago/Turabian Style

Lazar, Josef; Číp, Ondřej; Čížek, Martin; Hrabina, Jan; Buchta, Zdeněk. 2011. "Suppression of Air Refractive Index Variations in High-Resolution Interferometry." Sensors 11, no. 8: 7644-7655.


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