Title :
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
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);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.908449
