A Fiber Ring Laser Dilatometer for Measuring Thermal Expansion Coefficient of Ultralow Expansion Material

Author

Ryu, Han Young ; Suh, Ho Suhng

Author_Institution

Korea Res. Inst. of Stand. & Sci., Daejeon

Volume

19

Issue

24

fYear

2007

Firstpage

1943

Lastpage

1945

Abstract

A new type of measuring system for coefficient of linear thermal expansion (CTE) of ultralow expansion (ULE) material by using a fiber ring laser is introduced in this letter. The lasing frequency of the laser is stabilized to one of the transmission peaks of the etalon filter by controlling the resonant frequency of the tunable filter. The spacer of the (Fabry-Perot type) etalon filter is made of ULE material. We could measure the CTE of ULE by measuring the optical frequency change caused by the temperature change of the etalon spacer. The combined standard uncertainty is estimated as the value of plusmn36.6 ppb/degC in the temperature range from 5degC to 60degC.

Keywords

Fabry-Perot interferometers; extensometers; fibre lasers; fibre optic sensors; ring lasers; thermal expansion measurement; Fabry-Perot etalon filter; fiber ring laser dilatometer; lasing frequency; optical frequency change; temperature 5 degC to 60 degC; thermal expansion coefficient; ultralow expansion material; Fiber lasers; Frequency measurement; Laser stability; Optical control; Optical fiber filters; Optical materials; Resonant frequency; Ring lasers; Thermal expansion; Tunable circuits and devices; Air gap etalon filter (AGEF); ITU-T grid; coefficient of linear thermal expansion (CTE); ultralow expansion (ULE);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2007.908449

Filename

4390076