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Refractive Index Compensation in Over-Determined Interferometric Systems

Authors :
Zdeněk Buchta
Jan Hrabina
Martin Čížek
Ondřej Číp
Miroslava Holá
Josef Lazar
Source :
Sensors, Vol 12, Iss 10, Pp 14084-14094 (2012)
Publication Year :
2012
Publisher :
MDPI AG, 2012.

Abstract

We present an interferometric technique based on a differential interferometry setup for measurement under atmospheric conditions. The key limiting factor in any interferometric dimensional measurement are fluctuations of the refractive index of air representing a dominating source of uncertainty when evaluated indirectly from the physical parameters of the atmosphere. Our proposal is based on the concept of an over-determined interferometric setup where a reference length is derived from a mechanical frame made from a material with a very low thermal coefficient. The technique allows one to track the variations of the refractive index of air on-line directly in the line of the measuring beam and to compensate for the fluctuations. The optical setup consists of three interferometers sharing the same beam path where two measure differentially the displacement while the third evaluates the changes in the measuring range, acting as a tracking refractometer. The principle is demonstrated in an experimental setup.

Details

Language :
English
ISSN :
14248220
Volume :
12
Issue :
10
Database :
Directory of Open Access Journals
Journal :
Sensors
Publication Type :
Academic Journal
Accession number :
edsdoj.232add4aebb142ada258ab6927c2d2ad
Document Type :
article
Full Text :
https://doi.org/10.3390/s121014084