Suppression of air refractive index variations in high-resolution interferometry.
Sensors (Basel)
; 11(8): 7644-55, 2011.
Article
en En
| MEDLINE
| ID: mdl-22164036
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.
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Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Física
/
Nanotecnología
/
Interferometría
Idioma:
En
Revista:
Sensors (Basel)
Año:
2011
Tipo del documento:
Article
País de afiliación:
República Checa