Vibration and Magnetic Field Sensing Using a Long-Period Grating

Nascimento, I. M.; Chesini, Giancarlo; Baptista, J. M.; Cordeiro, Cristiano M. B.; Jorge, P. A. S.

doi:10.1109/jsen.2017.2743112

Cited by 12 publications

(7 citation statements)

References 25 publications

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“…The Terfenol‐D is often of sizable magnetostriction and low magnetic anisotropy, and it has therefore been considered as a promising energy harvesting component at the beginning . However, natural demerits such as high brittleness and low resistance to cyclic loading impede its further application especially as a vibration energy harvesting component . On the other hand, although Galfenol alloy has some metallic properties, the processing costs (high‐cost production, sophisticated processing, etc.)…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Inverse Magnetostrictive Effect through Stress Concentration for a Notch‐Introduced FeCo Alloy

et al. 2018

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The authors investigate the magnetic flux leakage for a class of magnetostrictive FeCo alloys with a notch undergoing compression and impact with respect to energy harvesting. The magnetic flux leakage plays a crucial role in the practical energy transition in terms of the features for energy harvesting. Therefore, the corresponding situations are systematically studied by combining finite element analysis (FEA) with practical experiments. The FeCo alloys are categorized into three groups with different three-dimensional notch shapes, and the depths of the notches are 0, 0.5, and 1 mm, respectively. The parameters in both the simulations and practical tests are completely consistent. The results of compression test carried out with a stepwiseincreasing stress from 0 to 100 MPa reveal that the variations of magnetic induced flux increase with the increasing depth of the notches. The following FEA herein provides a feasible interpretation that the stress concentration around the notch is largely responsible for the notch-induced enhancement. The findings of the impacting experiments simultaneously exhibit an analogous tendency that the output power is proportional to the depth of notch. Furthermore, the stress rate has no obvious effect on the output electricity. The maximum magnitude of the improvement for the output power increases by almost 400% comparing the specimens with notches of 0 and 1 mm. This study indicates a promising feasibility to achieve vibrationenergy harvesting from various irregular components.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Inverse Magnetostrictive Effect through Stress Concentration for a Notch‐Introduced FeCo Alloy

et al. 2018

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“…Notwithstanding its merits, the proposed sensor exhibits a limited dynamic range compared with typical optical fiber sensors based on strain gauges with magnetostrictive coatings 33,35 , holey fibers filled with ferrofluids 32 , and polarization-type, Faraday rotation transducers 34 . The current constraint of 100 µA frustrates applications in high-powered systems but endorses the ability to detect bioelectrical signals 36,37 .…”

Section: Discussionmentioning

confidence: 99%

Agar-based optical sensors for electric current measurements

Fujiwara

Rosa

Oku

et al. 2023

Preprint

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Biodegradable optical waveguides are breakthrough technologies to light delivery and sensing in biomedical and environmental applications. Agar emerges as an edible, soft, low-cost, and renewable alternative to traditional biopolymers, presenting remarkable optical and mechanical characteristics. Previous works introduced agar-made optical fibers for chemical measurements based on their inherent response to humidity and surrounding concentration. Therefore, we propose, for the first time, an all-optical, biodegradable electric current sensor. As flowing charges heat the agar matrix and modulate its refractive index, we connect the optical device to a DC voltage source using pin headers and excite the agar sample with coherent light to project spatiotemporally deviating speckle fields. Experiments proceeded with spheres and no-core fibers comprising 2 wt% agar/water. Once the increasing current stimulates the speckles’ motion, we acquire such images with a camera and evaluate their correlation coefficients, yielding exponential decay-like functions whose time constants provide the input amperage. Furthermore, the light granules follow the polarization of the applied voltage drop, providing visual information about the current direction. The results indicate a maximum resolution of ~0.5 µA for electrical stimuli ≤ 100 µA, which fulfills the requirements for bioelectrical signal assessment.

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“…Apart from the typical optical fiber sensors designed to operate in the A to kA range 32 – 36 , the ability to detect subtle electric signals inspires possible applications in biomedical setups, like the assessment of neural or muscular responses for predicting dysfunctions and establish assistive human-computer interfaces 37 , 38 . The soft, bioresorbable optical sensor may replace widespread electronic transducers and take advantage of the fiber sensors’ characteristics, such as flexibility and multiplexing capability.…”

Section: Introductionmentioning

confidence: 99%

Agar-based optical sensors for electric current measurements

Fujiwara,

Rosa,

Oku

et al. 2023

Sci Rep

Self Cite

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Biodegradable optical waveguides are breakthrough technologies to light delivery and sensing in biomedical and environmental applications. Agar emerges as an edible, soft, low-cost, and renewable alternative to traditional biopolymers, presenting remarkable optical and mechanical characteristics. Previous works introduced agar-made optical fibers for chemical measurements based on their inherent response to humidity and surrounding concentration. Therefore, we propose, for the first time, an all-optical, biodegradable electric current sensor. As flowing charges heat the agar matrix and modulate its refractive index, we connect the optical device to a DC voltage source using pin headers and excite the agar sample with coherent light to project spatiotemporally deviating speckle fields. Experiments proceeded with spheres and no-core fibers comprising 2 wt% agar/water. Once the increasing current stimulates the speckles’ motion, we acquire such images with a camera and evaluate their correlation coefficients, yielding exponential decay-like functions whose time constants provide the input amperage. Furthermore, the light granules follow the polarization of the applied voltage drop, providing visual information about the current direction. The results indicate a maximum resolution of $$\sim $$ ∼ 0.4 $$\upmu $$ μ A for electrical stimuli $$\le $$ ≤ 100 $$\upmu $$ μ A, which fulfills the requirements for bioelectrical signal assessment.

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Vibration and Magnetic Field Sensing Using a Long-Period Grating

Cited by 12 publications

References 25 publications

Enhancement of Inverse Magnetostrictive Effect through Stress Concentration for a Notch‐Introduced FeCo Alloy

Enhancement of Inverse Magnetostrictive Effect through Stress Concentration for a Notch‐Introduced FeCo Alloy

Agar-based optical sensors for electric current measurements

Agar-based optical sensors for electric current measurements

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