Highly reflective long period fiber grating sensor and its application in refractive index sensing

Cladless few mode fiber grating sensor for simultaneous refractive index and temperature measurement

“…Since last few decades, optical fiber sensors such as fiber Bragg gratings (FBGs), long period gratings (LPGs), interferometers, surface profile scanners, leakage light based sensors etc., have proven their pivotal role as industrial sensors in physical, chemical and biological applications [1][2][3][4][5][6][7][8]. It is due to their tremendous advantages such as compact structures, single sensing element, linear response, good robustness, immune to electromagnetic (EM) interference and capability of simultaneous detection of more than one measurands such as chemical concentration of the solution based on refractive index, temperature and etc.…”

Self-temperature-compensative refractometer based on singlemode–multimode–singlemode fiber structure

“…Optical fiber RI sensors have great potential for such kind of application [2]. All-fiber refractometers with several different structures, such as a long-period fiber grating [3,4], a photonic crystal fiber [5], a Mach-Zehnder interferometer [6], and a singlemode-multimode-singlemode (SMS) fiber structure [7], have been proposed. Among them, all-fiber refractometers based on the SMS structure have several additional merits, including easy fabrication, low cost, and design flexibility.…”

The influence of temperature to a refractive index sensor based on a macro-bending tapered plastic optical fiber

“…Refractive index (RI) sensors based on optical fibers are widely applied in biosensor [1] and chemical sensing [2][3][4] due to their specific advantages, such as immunity to electromagnetic interference, rapid response, compact size and remote sensing capability. A wide range of optical fiber RI sensors have been reported [1][2][3][4][5][6][7][8], and mostly composed of single-mode glass optical fibers (GOFs), which require complex processing of fibers and expensive experimental equipment.…”

“…A wide range of optical fiber RI sensors have been reported [1][2][3][4][5][6][7][8], and mostly composed of single-mode glass optical fibers (GOFs), which require complex processing of fibers and expensive experimental equipment. Several researchers have investigated the performance of plastic optical fibers (POFs) as an alternative to GOFs.…”