Absolute Measurement of the Refractive Index of Water by a Mode-Locked Laser at 518 nm.
Sensors (Basel)
; 18(4)2018 Apr 09.
Article
em En
| MEDLINE
| ID: mdl-29642518
ABSTRACT
In this paper, we demonstrate a method using a frequency comb, which can precisely measure the refractive index of water. We have developed a simple system, in which a Michelson interferometer is placed into a quartz-glass container with a low expansion coefficient, and for which compensation of the thermal expansion of the water container is not required. By scanning a mirror on a moving stage, a pair of cross-correlation patterns can be generated. We can obtain the length information via these cross-correlation patterns, with or without water in the container. The refractive index of water can be measured by the resulting lengths. Long-term experimental results show that our method can measure the refractive index of water with a high degree of accuracy-measurement uncertainty at 10-5 level has been achieved, compared with the values calculated by the empirical formula.
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01-internacional
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article