Publication detail

Methods of direct measurement of the refraction index of air using high-resolution laser interferometry

ČÍP, O., PETRŮ, F., MATOUŠEK, V., BUCHTA, Z., LAZAR, J.

Original Title

Methods of direct measurement of the refraction index of air using high-resolution laser interferometry

Type

journal article - other

Language

English

Original Abstract

Laser interferometers are even more precise distance measurement devices with resolution in nanometer or sub-nanometer regin. If interferometric measurements are carried out under atmospheric conditions(usual situation in industry), they measure optical path length of an unknown distance instead of its true geometrical value. It is caused by the index of refraction of air that introduces a multiplicative constant to measured results. If we want to obtain correct values, the knowledge of the index of refraction is necessary. In the work, we present design and the first experimental results of two methods of the direct measurement of the refraction index, where a Fabry-Perot(F.-P.)interferometer is used as a detection system. The first method employs an evacuatable cell inserted into the mirrors of the F.-P. interferometer and the other method consists of a diferential setup of two F.P interferometers, one of which is permanently evacuated.

Keywords

Refraction index of air

Authors

ČÍP, O., PETRŮ, F., MATOUŠEK, V., BUCHTA, Z., LAZAR, J.

Released

1. 3. 2004

Pages from

88

Pages to

90

Pages count

3

BibTex

@article{BUT41861,
  author="Ondřej {Číp} and František {Petrů} and Vít {Matoušek} and Zdeněk {Buchta} and Josef {Lazar}",
  title="Methods of direct measurement of the refraction index of air using high-resolution laser interferometry",
  year="2004",
  volume="2004",
  number="3",
  pages="3"
}