Abstract
In this paper, we propose a Fresnel reflection-based optical fiber sensor system for remote refractive index measurement using the optical time domain reflectometry technique as an interrogation method. The surrounding refractive index from a long distance away can be measured easily by using this sensor system, which operates based on testing the Fresnel reflection intensity from the fiber-sample interface. This system is a simple configuration, which is easy to handle. Experimental results showed that the range of this measurement could reach about 100.8 km, and the refractive index sensitivities were from 38.71 dB/RIU to 304.89 dB/RIU in the refractive index (RI) range from 1.3486 to 1.4525.
Highlights
Remote monitoring is useful and important for some applications such as chemical industry, marine environments assessment, and pipeline monitoring, and the refractive index (RI) is an inherent characteristic of a substance that is closely related to the physical and chemical properties, a precise detection of the RI is essential in some remote fields [1, 2], for example, the remote monitoring of the refractive index or solution concentration in some dangerous chemical industry is highly necessary for the safety production
We propose a remote refractive index sensor based on Fresnel reflection that can timely tell the RI value from a long distance away, the position of the testing point can be obtained by using a commercial optical time domain reflectometer (OTDR)
A simple Fresnel reflection-based optic fiber sensor has been proposed for the remote refractive index measurement
Summary
Remote monitoring is useful and important for some applications such as chemical industry, marine environments assessment, and pipeline monitoring, and the refractive index (RI) is an inherent characteristic of a substance that is closely related to the physical and chemical properties, a precise detection of the RI is essential in some remote fields [1, 2], for example, the remote monitoring of the refractive index or solution concentration in some dangerous chemical industry is highly necessary for the safety production. Fresnel reflection-based optic sensors have attracted general interest due to their simple structure, low cost, low cross infection, and durability against the harsh environment [3,4,5]. G. Shlyagin et al [6] proposed an optical fiber refractometer based on the Fresnel reflection in the fiber tip, in which a twin-Bragg grating interferometer is located at some distance from the fiber tip to eliminate the influence of light source fluctuation and environment. Shlyagin et al [6] proposed an optical fiber refractometer based on the Fresnel reflection in the fiber tip, in which a twin-Bragg grating interferometer is located at some distance from the fiber tip to eliminate the influence of light source fluctuation and environment Such a structure is complex and not suitable for a remote measurement. 304.73 dB/RIU in the RI range from 1.3486 to 1.4525
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
