A novel temperature-compensated method for FBG-GMM current sensor

A Sensitivity-enhanced Fiber Grating Current Sensor Based on Giant Magnetostrictive Material for Large-Current Measurement

“…Based on a large number of previous studies on this material [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28], the sensitivity of GMM, which is called Terfenol-D rod [25,26,27,28], to magnetic field is related to the prestressing force applied to GMM [14,15,16,17,18,19,20,21,22,23,24,25,26,27,28]. In the case different sizes of prestressing force are applied to this material, the slope of the magnetostriction coefficient of GMM, compared with the case of no prestressing force at all, is significantly improved, namely, the dynamic magnetostriction coefficient of GMM is significantly improved [14,15,16,17,18,19,20,21,22,23,24,28].…”

“…With the rapid development of the whole power industry, the highly automated and intelligent requirements of the current measurement system and the electrical appliances protection system are constantly increasing, therefore, the measurement of large currents has become an urgent problem to be solved [1,2,3,4,5,6,7,8,9,10,11,12,13]. For a long time, the current measurement of the high-voltage power grids has been done by using a traditional electromagnetic current sensor [11,12,13], but the traditional electromagnetic current sensor has various shortcomings, for example, magnetic saturation, ferromagnetic resonance, narrow frequency band, small dynamic range, oil flammability and explosivity, etc.…”

“…In the past decade, the research in the field of improving the sensitivity of the fiber grating current sensor has made some progress [1,2,3,4,5,6,7,8,9,10,11,12]. Generally speaking, there are two ways to improve the sensitivity: one is to improve the demodulation system of the fiber grating current sensor.…”

“…The matched demodulation method has also high sensitivity [7,8,9,10,11,12], but it has a narrow dynamic range and is susceptible to the external environment, at the same time, the cost of CWDM and AWG is very high as well [11]. In the research of this sensor body [11,12], universities, research institutes and many enterprises at home and abroad are devoted to the development of giant magnetostrictive materials with better flexibility [1,2,3,4,5,6,7,8,9,10,11,12,13], the use of more accurate reading and conversion instruments, the selection of more accurate and suitable error processing methods and writing more optimized the structural data processing algorithms, etc. [11,12].…”

Dynamic Magnetic Field Measurement in the Air Gap of Magnetic Bearings Based on FBG-GMM Sensor

“…In reference [13], a magnetic field sensor was proposed to measure the static and dynamic magnetic field in the air-gap of electric generators while the FBG was coated by a layer of magnetostrictive composite. In reference [14], the FBG-GMM sensors were proposed to measure current ranging from -170 A to 170 A. In reference [15], GMM and the MONEL400 metal alloy were bonded on the same FBG to be a current sensor.…”