Magnetic field sensor based on magnetic fluid clad etched fiber Bragg grating

Optical Current Sensors for High Power Systems: A Review

“…Dai et al [80] investigated a novel fiber optic sensor based on magnetic fluid and etched gratings. The nanoparticles of Fe 3 O 4 (the magnetic fluid used) were injected into capillaries containing etched FBGs acting as sensing elements.…”

Intensity-modulated magnetic field sensor based on magnetic fluid and optical fiber gratings

“…1,2 Recently, magnetic fluid (MF), as an attractive nano-material with magneto-optical effects including Faraday effect, tunable refractive index, field dependent transmission and birefringence, 3,4 was intensively investigated in magnetic field measurement. [5][6][7][8][9] By taking advantage of the field dependent birefringence of MF, Zu et al reported an optical fiber Sagnac interferometer based magneto-optical fiber sensor. 5 The same group of researchers infiltrated MF into air holes in the cladding of a short length index-guided photonic crystal fiber to convert it into a photonic bandgap fiber with a tunable band gap and measured magnetic field by monitoring the bandgap wavelength.…”

“…7 Optical fiber gratings based magnetic field sensors or tunable filters were also reported by surrounding them with MFs. [8][9][10][11][12] Various fiber gratings have been used, including long-period fiber gratings, 8 cladding-etched fiber Bragg gratings, 9 and tilted-fiber Bragg gratings (TFBGs). 11,12 Childs et al reported a two-TFBG-based cavity structure with MF coating, but the ghost mode-based resonance adds to the difficulty of fabrication.…”

Optical temperature sensing on flexible polymer foils

“…Sensing fields such as strain [16], pressure [17][18][19], ultrasonic waves [20][21][22], force [23][24][25], acceleration [26,27], magnetic field [28,29], and temperature [30][31][32] were covered by FBGs over the years.…”