Tapered plastic multimode fiber sensor for salinity detection

Ag micro-spheres doped silica fiber used as a miniature refractive index sensor

“…The label-free fiber sensors have attracted the research interest of the scientists from all over the world due to their high sensitivity. The photonic crystal fiber, tapered fiber, fiber grating and fiber interferometer have been explored to sense the concentration change of NaCl solution [12][13][14][15][16]. The corresponding sensitivity have been obtained as high as 46.4 mV/RIU for the intensity modulation method [17] and ∼1400 nm/RIU for the wavelength modulation method [18].…”

Humidity sensor based on tapered single mode fiber coated with a hydroxyethyl cellulose/poly-vinylidene fluoride composite

“…They also offer various possibilities for multiplexing a large number of different sensors (e.g., those used for detecting temperature, pH, humidity, high magnetic field, displacement, pressure and acceleration) into the same optical fibre, thus removing a need in multiply cabling required in traditional electronic sensing [1]. Likewise, tapered fibres have also attracted a considerable interest in the recent years since they exhibit a number of exciting properties [2][3][4]. The tapered fibres manifest a strong evanescent field that travels along the cladding, which can be manipulated for different sensing applications.…”

Optical Fiber Sensing of Salinity and Liquid Level

“…Sensitivity matrix method is used to determine precise simultaneous temperature and salinity variations of a solution [3]. Another tapered plastic fiber optic sensor has been implemented for salinity sensing and concentration measurement based on intensity modulation technique [4], [5]. Other than tapered fiber sensors, different head design concepts of fiber sensors such as U-shaped and spiral-shaped have been investigated and the high efficiency of U-shaped has been observed in terms of simplicity, sensitivity and reversibility [5].…”