Optical fiber liquid refractive index sensor based on Fresnel reflection of anti-Stokes light

•An optical fiber liquid RI sensing method based on Fresnel reflection of anti-Stokes light is firstly proposed.•It adds a new functionality to the traditional DTS, thus the sensor can remotely measure liquid RI and temperature.•With only one MMF, the sensor is small dimensions, simple fabrication,...

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 2018-08, Vol.279, p.140-144
Main Authors: Wang, Dong, Tong, Jingkuo, Jin, Baoquan, Wang, Yu, Zhang, Mingjiang
Format: Article
Language:English
Subjects:
Electromagnetics
Electromagnetism
Fresnel reflection
Light reflection
Optical fibers
Optical remote sensor
Organic chemistry
Raman anti-Stokes light
Rangefinding
Refractive index sensing
Refractivity
Remote sensing
Remote sensors
Sensors
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Summary:•An optical fiber liquid RI sensing method based on Fresnel reflection of anti-Stokes light is firstly proposed.•It adds a new functionality to the traditional DTS, thus the sensor can remotely measure liquid RI and temperature.•With only one MMF, the sensor is small dimensions, simple fabrication, free from electromagnetic interference. An optical fiber liquid refractive index (RI) sensing method based on Fresnel reflection of Raman anti-Stokes light is firstly proposed and demonstrated. A specially fabricated sensor head formed by a fiber end and a fiber coil is designed, and they are used to sense RI and temperature respectively. Experimental results show that the sensor has a RI resolution up to 0.0002 RIU (Refractive Index Unit) and a temperature accuracy of ±1 °C within a measurement range of 10 km. The performance confirms that the sensor has potential to act as a remote refractometer and thermometer. Its case of simple fabrication of using only one multimode fiber offers attractive remote RI and temperature sensing applications involving chemical and biological fields.
ISSN:0924-4247
1873-3069
DOI:10.1016/j.sna.2018.06.015