Flow cell for strain- and temperature-compensated refractive index measurements by means of cascaded optical fibre long period and Bragg gratings

被引：56

作者：

Trono, C. ^{[1
]}

Baldini, F. ^{[1
]}

Brenci, M. ^{[1
]}

Chiavaioli, F. ^{[2
]}

Mugnaini, M. ^{[2
]}

机构：

[1] CNR IFAC, Natl Res Council, Inst Appl Phys Nello Carrara, I-50019 Sesto Fiorentino, FI, Italy

[2] Univ Siena, Dept Informat Engn, I-53100 Siena, Italy

来源：

MEASUREMENT SCIENCE AND TECHNOLOGY | 2011年 / 22卷 / 07期

关键词：

refractive index measurements; flow cell; long period fibre gratings; fibre Bragg gratings; fibre grating sensors; SENSORS; MODE; REFRACTOMETER; SINGLE;

D O I：

10.1088/0957-0233/22/7/075204

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An optical fibre sensing system based on a hybrid cascaded long period grating (LPG) and fibre Bragg grating configuration and a thermo-stabilized flow cell for refractometric measurements is proposed. The system makes it possible to measure, and thus to cancel, the LPG cross-sensitivities to strain, temperature and fibre bending. The experimental results show that the proposed system provides satisfactory performances as far as the refractive index sensitivity and resolution are concerned. The maximum sensor sensitivity and resolution are 3120 nm/RIU and 2 x 10(-5) RIU, respectively. The whole system with its flow cell and the gratings fabrication are extensively described, together with the acquisition and data processing. The stability of the sensor for several hours was also tested. We believe that the proposed system can be successfully used for label-free chemical/biochemical sensing.

引用

页数：9

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