Sensitivity Tuning in Terfenol-D Based Fiber Bragg Grating Magnetic Sensors

Ambrosino, C.; Campopiano, Stefania; Cutolo, A.; Cusano, A.

doi:10.1109/jsen.2008.925159

Cited by 31 publications

(11 citation statements)

References 9 publications

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“…fiber and they are characterized by a relatively simple interrogation method [6]. For the above mentioned reasons FBGs have been used in combination with Terfenol-D to implement magnetic field sensors and actuators with very different operation designs [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Magnetic actuator based on giant magnetostrictive material Terfenol-D with strain and temperature monitoring using FBG optical sensor

et al. 2016

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We have designed a temperature and strain monitoring system for a magnetic actuator based on the giant magnetostrictive material Terfenol-D (Tb 0.3 Dy 0.7 Fe 1.92) with Fiber Bragg grating (FBG) sensors. Magneto-elastic properties of Terfenol-D depend on magnetization, stress prehistory , and temperature. In order to simultaneously monitor these effects, we have implemented a system based on a cylindrical Terfenol-D rod monitored with four FBGs that allows making the appropriate compensations on the strain measurement due to temperature drift. We have measured the magnetostriction in the axial and the transverse directions for the Terfenol-D rod with two perpendicular FBGs, and calculated the Poisson ratio. An additional mechanical system for strain amplification has been designed in order to increase sensitivity, by a factor of 4, in the strain measurement with the FBG sensor.

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Section: Introductionmentioning

confidence: 99%

Magnetic actuator based on giant magnetostrictive material Terfenol-D with strain and temperature monitoring using FBG optical sensor

et al. 2016

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“…FBG Magnetic Field Sensors. By using a magnetostrictive material to change the strain of an FBG according to the magnetic field, many FBG magnetic field sensors have been developed [79][80][81][82][83][84][85][86][87][88]. This method was early reported in [87], and a resolution of 2 mA has been reported [88].…”

Section: Fbg Pressure Sensorsmentioning

confidence: 99%

Review of the Strain Modulation Methods Used in Fiber Bragg Grating Sensors

2016

Journal of Sensors

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Fiber Bragg grating (FBG) is inherently sensitive to temperature and strain. By modulating FBG's strain, various FBG sensors have been developed, such as sensors with enhanced or reduced temperature sensitivity, strain/displacement sensors, inclinometers, accelerometers, pressure meters, and magnetic field meters. This paper reviews the strain modulation methods used in these FBG sensors and categorizes them according to whether the strain of an FBG is changed evenly. Then, those even-strain-change methods are subcategorized into (1) attaching/embedding an FBG throughout to a base and (2) fixing the two ends of an FBG and (2.1) changing the distance between the two ends or (2.2) bending the FBG by applying a transverse force at the middle of the FBG. This review shows that the methods of "fixing the two ends" are prominent because of the advantages of large tunability and frequency modulation.where is the stress-optic coefficient. When temperature changes, the resonant wavelength will also change. Its inherent temperature sensitivity is about 10 pm/ ∘ C. The strain of an FBG has been modulated for varying its temperature sensitivity [31][32][33][34][35][36][37][38][39][40] and monitoring strain/displacement [41-49], inclination [50-56], acceleration [57-68], pressure [69-78], magnetic field [79-88], and rotation [89].

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“…Miniature FBG sensors are often employed in medicine for temperature [16,17] and strain sensing [18][19][20] and in harsh environments such as nuclear plants [21,22]. FBG sensors have also been functionalized to pressure [20], magnetic [23,24], and chemical [25] detection, usually with the help of transductors.…”

Section: Introductionmentioning

confidence: 99%

Improved KLT Algorithm for High-Precision Wavelength Tracking of Optical Fiber Bragg Grating Sensors

Tosi¹

2017

Journal of Sensors

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Fiber Bragg Gratings (FBGs) are among the most popular optical fiber sensors. FBGs are well suited for direct detection of temperature and strain and can be functionalized for pressure, humidity, and refractive index sensing. Commercial setups for FBG interrogation are based on white-light sources and spectrometer detectors, which are capable of decoding the spectrum of an FBG array. Low-cost spectrometers record the spectrum on a coarse wavelength grid (typically 78–156 pm), whereas wavelength shifts of 1 pm or lower are required by most of the applications. Several algorithms have been presented for detection of small wavelength shift, even with coarse wavelength sampling; most notably, the Karhunen-Loeve Transform (KLT) was demonstrated. In this paper, an improved algorithm based on KLT is proposed, which is capable of further expanding the performances. Simulations show that, reproducing a commercial spectrometer with 156 pm grid, the algorithm estimates wavelength shift with accuracy well below 1 pm. In typical signal-to-noise ratio (SNR) conditions, the root mean square error is 22–220 fm, while the accuracy is 0.22 pm, despite the coarse sampling. Results have been also validated through experimental characterization. The proposed method allows achieving exceptional accuracy in wavelength tracking, beating the picometer level resolution proposed in most commercial and research software, and, due to fast operation (>5 kHz), is compatible also with structural health monitoring and acoustics.

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Sensitivity Tuning in Terfenol-D Based Fiber Bragg Grating Magnetic Sensors

Cited by 31 publications

References 9 publications

Magnetic actuator based on giant magnetostrictive material Terfenol-D with strain and temperature monitoring using FBG optical sensor

Magnetic actuator based on giant magnetostrictive material Terfenol-D with strain and temperature monitoring using FBG optical sensor

Review of the Strain Modulation Methods Used in Fiber Bragg Grating Sensors

Improved KLT Algorithm for High-Precision Wavelength Tracking of Optical Fiber Bragg Grating Sensors

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