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

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1755 ◽  
Author(s):  
Shuchao Wang ◽  
Fu Wan ◽  
Hong Zhao ◽  
Weigen Chen ◽  
Weichao Zhang ◽  
...  
Keyword(s):  
High Voltage ◽  
Low Cost ◽  
High Sensitivity ◽  
Power Industry ◽  
Current Sensor ◽  
Fiber Grating ◽  
Online Measurement ◽  
Magnetostrictive Material ◽  
Giant Magnetostrictive Material ◽  
Large Current

Currently, in the modern power industry, it is still a great challenge to achieve high sensitivity and uninterrupted-online measurement of large current on the high voltage gridlines. At present, the fiber grating current sensors based on giant magnetostrictive material used in the modern power industry to achieve uninterrupted-online measurement of large currents on high voltage grid lines is a better method, but the sensitivity of this current sensor is relatively low, therefore, it is key to improve the sensitivity of this current sensor. Here we show a sensitivity-enhanced fiber grating current sensor based on giant magnetostrictive material (in the following, simply referred to as the sensitivity-enhanced fiber grating current sensor) that is able to achieve high sensitivity and uninterrupted-online measurement of large currents by means of pressurizing the giant magnetostrictive material. Sampling the power frequency sinusoidal alternating current signals with the amplitudes of 107, 157 and 262 A respectively, based on realistic factors, for the sensitivity-enhanced current sensor, the sensitivities, compared with that of the traditional fiber grating current sensor based on giant magnetostrictive material (in the following, simply referred to as the traditional fiber grating current sensor), were respectively enhanced by 268.96%, 135.72% and 71.57%. Thus the sensitivity-enhanced fiber grating current sensor allows us to solve the issue of high sensitivity and uninterrupted-online measurement of large currents that have been plaguing the power industry in a very simple and low-cost way.

scholarly journals A Low-Cost Current Sensor Based on Semi-Cylindrical Magnetostrictive Composite

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1833
Author(s):  
Shaoyi Xu ◽  
Qiang Peng ◽  
Fangfang Xing ◽  
Hongyu Xue ◽  
Junwen Sun ◽  
...  
Keyword(s):  
Particle Size ◽  
Epoxy Resin ◽  
Low Cost ◽  
High Sensitivity ◽  
Current Sensor ◽  
Mass Ratio ◽  
Particle Size Range ◽  
Giant Magnetostrictive Material ◽  
Wide Range ◽  
Magnetostrictive Composites

This paper presents the design, fabrication, and characterization of a compact current sensor based on magnetostrictive composites and resistance strain gauges. Firstly, we designed three kinds of current sensors with different structures, in which the shape of the giant magnetostrictive material (GMM) was cuboid, cylindrical, and semi-cylindrical. A set of finite element method (FEM) simulations were performed to qualitatively guide the design of three prototypes of the current sensor. It was determined that the most ideal shape of the GMM was semi-cylindrical. Secondly, Terfenol-D (TD) powder and epoxy resin were mixed to prepare magnetostrictive composites. In this paper, magnetostrictive composites with different particle size ranges and mass ratio were prepared and tested. The results show that the magnetostrictive composites had the best performance when the particle size range was 149–500 μm and the mass ratio of epoxy resin to TD powder was 1:5. Finally, this paper tested the performance of the sensor. The sensitivity, repeatability, and linear working range of the sensor reached 0.104 με/A, 2.51%, and 100–900 A respectively, when only 0.31 g of TD powder was employed. This means that current measurement with low cost, high sensitivity, and wide range was realized.

The Design Research of Inductance Sensor in the AMB Rotor System

2014 ◽  
Vol 602-605 ◽  
pp. 1463-1467
Author(s):  
Wen Tao Yu ◽  
Hong Wei Li ◽  
Shu Qin Liu
Keyword(s):  
Design Research ◽  
Simulation Analysis ◽  
Low Cost ◽  
High Sensitivity ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Current Sensor ◽  
Electromagnetic Environment ◽  
Sensor Structure ◽  
Inductance Sensor

The sensor is an important part of the active magnetic bearing system, which directly affects the performance of the entire system. Compared with the eddy current sensor, inductive sensor has the advantages of low cost, high sensitivity, and is not sensitive to the electromagnetic environment; Influenced by the ambient temperature is small. In this paper, design research from two aspects of the sensor structure and circuit, and the sensor was simulation analysis, which laid the foundation in the application of magnetic bearing systems.

Driving Power Supply of Single-Chamber and Single-Vibrator Piezoelectric Pump

2013 ◽  
Vol 442 ◽  
pp. 386-391
Author(s):  
Ye Ming Sun ◽  
Guang Ming Cheng ◽  
Ping Zeng
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Low Cost ◽  
Driving Voltage ◽  
Piezoelectric Pump ◽  
Single Chamber ◽  
Output Performance ◽  
Large Current ◽  
Operating Frequency Range ◽  
Sine Signal

Aiming at driving requirements of single-chamber and single-vibrator piezoelectric pump, a driving power supply is designed. Firstly, the power supply utilizes signal generating circuit to obtain a tiny sine signal with adjustable amplitude and frequency. Then it utilizes high-voltage amplifying circuit and power amplifying circuit to gain high voltage and large current to drive the piezoelectric pump. Prototype of driving power supply is manufactured and its output performance is tested. Experimental results show that, in power supply, the driving signal output approaches sine signal in waveform, and controlling varies of piezoelectric pump (driving voltage and frequency) can be adjusted independently and continuously. Within operating frequency range of piezoelectric pump, the driving voltage is up to 170V. The driving power supply designed meets the driving requirements of the piezoelectric pump, and has advantages of small size, light weight, and low cost.

scholarly journals Novel giant magnetostrictive material current sensor

2015 ◽  
Vol 87 ◽  
pp. 012089
Author(s):  
Yan Shen ◽  
Zhao Liu ◽  
Qiuyan Lin ◽  
Jinming Ge ◽  
Guoqing Zhang ◽  
...  
Keyword(s):  
Current Sensor ◽  
Magnetostrictive Material ◽  
Giant Magnetostrictive Material

A Demodulation Scheme for High-Sensitivity Temperature Sensing Based on Long Period Fiber Grating

2011 ◽  
Vol 216 ◽  
pp. 523-527
Author(s):  
Hong Xia Zhao ◽  
Li Wei ◽  
Zhi Qun Ding
Keyword(s):  
Low Cost ◽  
High Sensitivity ◽  
Pulse Interval ◽  
Fiber Grating ◽  
Practical Applications ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Wide Range ◽  
Signal Demodulation ◽  
Period Fiber Grating

Long Period Fiber Grating (LPFG) sensors have wide range of potential applications; low-cost and high-sensitivity demodulation technology is the key of its practical applications. In this paper, an interferometer is comprised of an all-fiber loop mirror and two identical LPFGs, a tunable F-P filter is used to perform wavelength scanning one of the interference peaks, two negative pulse interval formed by signal light in the drive signal period are measured by means of detector and oscilloscope to realize signal demodulation. This demodulation system was used to detect the temperature parameter. The results showed that the sensing sensitivity of this system was demonstrated to be 0.08349 ms/°C, experimentally, which was 2.3 times higher than a single LPFG using the same demodulation technology.

Application of Imaging Plate to High-Voltage Electron Microscopy

1990 ◽  
Vol 48 (1) ◽  
pp. 168-169
Author(s):  
Seiji Isoda ◽  
Kimitsugu Saitoh ◽  
Sakumi Moriguchi ◽  
Takashi Kobayashi
Keyword(s):  
Electron Microscopy ◽  
High Voltage ◽  
High Sensitivity ◽  
Imaging Plate ◽  
High Quality ◽  
Electron Dose ◽  
High Voltage Electron Microscopy ◽  
Voltage Electron ◽  
High Voltage Electron ◽  
Recording Material

On the observation of structures by high resolution electron microscopy, recording materials with high sensitivity and high quality is awaited, especially for the study of radiation sensitive specimens. Such recording material should be easily combined with the minimum dose system and cryoprotection method. Recently a new recording material, imaging plate, comes to be widely used in X-ray radiography and also in electron microscopy, because of its high sensitivity, high quality and the easiness in handling the images with a computer. The properties of the imaging plate in 100 to 400 kV electron microscopes were already discussed and the effectiveness was revealed.It is demanded to study the applicability of the imaging plate to high voltage electron microscopy. The quality of the imaging plate was investigated using an imaging plate system (JEOL EM-HSR100) equipped in a new Kyoto 1000kV electron microscope. In the system both the imaging plate and films can be introduced together into the camera chamber. Figure 1 shows the effect of accelerating voltage on read-out signal intensities from the imaging plate. The characteristic of commercially available imaging plates is unfortunately optimized for 100 to 200 keV electrons and then for 600 to 1000 keV electrons the signal is reduced. In the electron dose range of 10−13 to 10−10 C/cm2, the signal increases linearly with logarithm of electron dose in all acceralating volatges.

scholarly journals Integrating high-performing electrochemical transducers in lateral flow assay

2021 ◽  
Author(s):  
Antonia Perju ◽  
Nongnoot Wongkaew
Keyword(s):  
High Performance ◽  
Point Of Care ◽  
Low Cost ◽  
High Sensitivity ◽  
Lateral Flow ◽  
Analytical Performance ◽  
Label Free ◽  
High Performing ◽  
Lateral Flow Assays ◽  
Electrochemical Transducers

AbstractLateral flow assays (LFAs) are the best-performing and best-known point-of-care tests worldwide. Over the last decade, they have experienced an increasing interest by researchers towards improving their analytical performance while maintaining their robust assay platform. Commercially, visual and optical detection strategies dominate, but it is especially the research on integrating electrochemical (EC) approaches that may have a chance to significantly improve an LFA’s performance that is needed in order to detect analytes reliably at lower concentrations than currently possible. In fact, EC-LFAs offer advantages in terms of quantitative determination, low-cost, high sensitivity, and even simple, label-free strategies. Here, the various configurations of EC-LFAs published are summarized and critically evaluated. In short, most of them rely on applying conventional transducers, e.g., screen-printed electrode, to ensure reliability of the assay, and additional advances are afforded by the beneficial features of nanomaterials. It is predicted that these will be further implemented in EC-LFAs as high-performance transducers. Considering the low cost of point-of-care devices, it becomes even more important to also identify strategies that efficiently integrate nanomaterials into EC-LFAs in a high-throughput manner while maintaining their favorable analytical performance.

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