suppression of air refractive index variations in high-resolution interferometry压抑的空气折射率高分辨率干涉法的变化.pdf
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Sensors 2011, 11, 7644-7655; doi:10.3390/s110807644
OPEN ACCESS
sensors
ISSN 1424-8220
/journal/sensors
Article
Suppression of Air Refractive Index Variations in
High-Resolution Interferometry
Josef Lazar *, Ondřej Číp, Martin Čížek, Jan Hrabina and Zdeněk Buchta
Institute of Scientific Instruments, Academy of Sciences of the Czech Republic, Královopolská 147,
Brno 612 64, Czech Republic; E-Mails: ocip@isibrno.cz (O.C.); cizek@isibrno.cz (M.C.);
shane@isibrno.cz (J.H.); buchta@isibrno.cz (Z.B.)
* Author to whom correspondence should be addressed; E-Mail: joe@isibrno.cz;
Tel.: +420-541-514-253; Fax: +420-541-514-402.
Received: 16 June 2011; in revised form: 23 July 2011 / Accepted: 24 July 2011 /
Published: 2 August 2011
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 differen
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