TY - JOUR
T1 - All-glass extrinsic Fabry-Perot interferometer thermo-optic coefficient sensor based on a capillary bridged two fiber ends
AU - Cao, Zhitao
AU - Jiang, Lan
AU - Wang, Sumei
AU - Wang, Mengmeng
AU - Liu, Da
AU - Wang, Peng
AU - Zhang, Fei
AU - Lu, Yongfeng
N1 - Publisher Copyright:
© 2015 Optical Society of America.
PY - 2015
Y1 - 2015
N2 - An all-glass extrinsic Fabry-Perot interferometer (EFPI) is demonstrated for thermal-optic coefficient (TOC) of water, glycerol, and their mixture (volume ratio of 1:1). The compensation for the thermal expansion of Fabry-Perot (FP) cavity is realized by assembling a glass capillary and optical fibers through a CO2 laser welding. The thermal responses of EFPIs are tested in air at different cavity lengths of 578.6 μm, 911.7 μm, and 1520.3 μm, respectively. The corresponding refractive index errors induced by thermal expansion of FP cavity are negligible, which are demonstrated to be 4.33 × 10-6 RIU/°C, 4.13 × 10-6 RIU/°C, and 3.45 × 10-6 RIU/°C when temperature increases from 20.03°C to 60.78°C. The thermal-optic coefficients of water, glycerol, and their mixture are measured to be -1.5 × 10-4 RIU/°C, -2.3 × 10-4 RIU/°C, and -2.0 × 10-4 RIU/°C, respectively. Our study suggests a potential use of this sensor for TOC measurements of liquids with the advantages of low costs and robustness.
AB - An all-glass extrinsic Fabry-Perot interferometer (EFPI) is demonstrated for thermal-optic coefficient (TOC) of water, glycerol, and their mixture (volume ratio of 1:1). The compensation for the thermal expansion of Fabry-Perot (FP) cavity is realized by assembling a glass capillary and optical fibers through a CO2 laser welding. The thermal responses of EFPIs are tested in air at different cavity lengths of 578.6 μm, 911.7 μm, and 1520.3 μm, respectively. The corresponding refractive index errors induced by thermal expansion of FP cavity are negligible, which are demonstrated to be 4.33 × 10-6 RIU/°C, 4.13 × 10-6 RIU/°C, and 3.45 × 10-6 RIU/°C when temperature increases from 20.03°C to 60.78°C. The thermal-optic coefficients of water, glycerol, and their mixture are measured to be -1.5 × 10-4 RIU/°C, -2.3 × 10-4 RIU/°C, and -2.0 × 10-4 RIU/°C, respectively. Our study suggests a potential use of this sensor for TOC measurements of liquids with the advantages of low costs and robustness.
UR - http://www.scopus.com/inward/record.url?scp=84942370912&partnerID=8YFLogxK
U2 - 10.1364/AO.54.002371
DO - 10.1364/AO.54.002371
M3 - Article
AN - SCOPUS:84942370912
SN - 1559-128X
VL - 54
SP - 2371
EP - 2375
JO - Applied Optics
JF - Applied Optics
IS - 9
ER -