scholarly journals Multifunctional Detection Sensor and Sensitivity Improvement of a Double Solenoid Coil Sensor

Micromachines ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 377 ◽  
Author(s):  
Laihao Ma ◽  
Zhiwei Xu ◽  
Hongpeng Zhang ◽  
Weiliang Qiao ◽  
Haiquan Chen
Keyword(s):  
Silicon Steel ◽  
Detection Sensitivity ◽  
Metal Particles ◽  
Iron Particles ◽  
Water Droplets ◽  
Copper Particles ◽  
Detection Model ◽  
Steel Sheets ◽  
Capacitance Detection ◽  
Improvement Effect

A multifunction detection sensor for hydraulic oil contaminants based on a microfluidic chip is proposed, which consists of double solenoid coils and a straight microchannel. The inductance detection model of metal particles and capacitance detection model of nonmetal particles are constructed theoretically. In order to further improve detection sensitivity, experiments of effects of silicon steel sheets on the sensitivity of detection are carried out. Experimental results show that the silicon steel sheets can significantly improve the detection sensitivity of metal particles. The inductance amplitude and signal-to-noise (SNR) of iron particles ranging from 60–130 μm and copper particles ranging from 120–180 μm can be increased by at least 7.0–2.4 and 4.5–2.0 times, respectively. We demonstrate the successful detection of 30 μm iron particles and 90 μm copper particles using double solenoid coils with silicon steel sheets. In capacitance detection experiments, the silicon steel sheets can improve the sensitivity of capacitance detection, but the improvement effect is not obvious. We demonstrate the successful detection of 140 μm water droplets and 240 μm bubbles using double solenoid coils with and without silicon steel sheets. The capacitance amplitude and SNR of detecting water droplets ranging from 140–150 μm and bubbles ranging from 240–250 μm can be increased by 37.4–21.9% and 18.5–8.0% using double solenoid coils with silicon steel sheets, respectively.

Debris Detection in Hydraulic Oil Using a Microfluidic Inductive Pulse Device

2012 ◽  
Author(s):  
Hongpeng Zhang ◽  
Wen Huang ◽  
Junwei Jin ◽  
Li Guo ◽  
Dongqing Li
Keyword(s):  
Wear Debris ◽  
Wear Particle ◽  
Metal Particles ◽  
Iron Particles ◽  
Essential Information ◽  
Copper Particles ◽  
Hydraulic Oil ◽  
Metal Wear ◽  
Particle Contamination ◽  
The Relationship

Metal wear debris is an important component of oil particle contamination and is also an essential information carrier in hydraulic oil. Based on inductive Coulter counting principle, a microfluidic device to detect wear debris in oil is presented. The proposed device has the advantage that in theory the distance between wear particle in oil and an embedded coil is 0, which can greatly improve the sensitivity of detection. The relationship between coil parameters and inductive change of a coil is analyzed through the related experimental statistics. The result indicates it can distinguish effectively ferrous and nonferrous metal particles in oil, and the size of 19 μm iron particles and 40 μm copper particles can be detected.

scholarly journals A Novel Impedance Micro-Sensor for Metal Debris Monitoring of Hydraulic Oil

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 150
Author(s):  
Hongpeng Zhang ◽  
Haotian Shi ◽  
Wei Li ◽  
Laihao Ma ◽  
Xupeng Zhao ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Wear Debris ◽  
Detection Method ◽  
Silicon Steel ◽  
Detection Sensitivity ◽  
Normal Operation ◽  
Metal Debris ◽  
Hydraulic Oil ◽  
Steel Strips ◽  
The Magnetic Field

Hydraulic oil is the key medium for the normal operation of hydraulic machinery, which carries various wear debris. The information reflected by the wear debris can be used to predict the early failure of equipment and achieve predictive maintenance. In order to realize the real-time condition monitoring of hydraulic oil, an impedance debris sensor that can detect inductance and resistance parameters is designed and studied in this paper. The material and size of wear debris can be discriminated based on inductance-resistance detection method. Silicon steel strips and two rectangular channels are designed in the sensor. The silicon steel strips are used to enhance the magnetic field strength, and the double rectangular detection channels can make full use of the magnetic field distribution region, thereby improving the detection sensitivity and throughput of the sensor. The comparison experiment shows that the coils in series are more suitable for the monitoring of wear debris. By comparing and analyzing the direction and the presence or absence of the signal pulses, the debris sensor can detect and distinguish 46 µm iron particles and 110 µm copper particles. This impedance detection method provides a new technical support for the high-precision distinguishing measurement of metal debris. The sensor can not only be used for oil detection in the laboratory, but also can be made into portable oil detection device for machinery health monitoring.

scholarly journals Consideration of ferromagnetic anisotropy in electrical machines built of segmented silicon steel sheets

2020 ◽  
Vol 14 (3) ◽  
pp. 242-249
Author(s):  
Fabian Müller ◽  
Gregor Bavendiek ◽  
Nora Leuning ◽  
Benedikt Schauerte ◽  
Kay Hameyer
Keyword(s):  
Silicon Steel ◽  
Electrical Machines ◽  
Steel Sheets

scholarly journals Passive Magnetic-Flux-Concentrator Based Electromagnetic Targeting System for Endobronchoscopy

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5105
Author(s):  
Chen ◽  
Lin ◽  
Chang ◽  
Cheng ◽  
Chen ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Electromagnetic Induction ◽  
Bronchial Tree ◽  
Silicon Steel ◽  
Induced Voltage ◽  
High Permeability ◽  
Tree Model ◽  
Steel Sheets ◽  
Pattern Change ◽  
Flux Concentrator

In this paper, we demonstrate an innovative electromagnetic targeting system utilizing a passive magnetic-flux-concentrator for tracking endobronchoscope used in the diagnosis process of lung cancer tumors/lesions. The system consists of a magnetic-flux emitting coil, a magnetic-flux receiving electromagnets-array, and high permeability silicon-steel sheets rolled as a collar (as the passive magnetic-flux-concentrator) fixed in a guide sheath of an endobronchoscope. The emitting coil is used to produce AC magnetic-flux, which is consequently received by the receiving electromagnets-array. Due to the electromagnetic-induction, a voltage is induced in the receiving electromagnets-array. When the endobronchoscope’s guide sheath (with the silicon-steel collar) travels between the emitting coil and the receiving electromagnets-arrays, the magnetic flux is concentrated by the silicon-steel collar and thereby the induced voltage is changed. Through analyzing the voltage–pattern change, the location of the silicon–steel collar with the guide sheath is targeted. For testing, a bronchial-tree model for training medical doctors and operators is used to test our system. According to experimental results, the system is successfully verified to be able to target the endobronchoscope in the bronchial-tree model. The targeting errors on the x-, y- and z-axes are 9 mm, 10 mm, and 5 mm, respectively.

Preparation of nanocrystalline copper by electrodeposition

1997 ◽  
Vol 12 (10) ◽  
pp. 2719-2724 ◽  
Author(s):  
S. Bandyopadhyay ◽  
D. Chakravorty
Keyword(s):  
Mie Theory ◽  
Composite Films ◽  
Dip Coating ◽  
Metal Particles ◽  
Electrodeposition Process ◽  
Copper Particles ◽  
Glass Slides ◽  
Polystyrene Matrix ◽  
Dip Coating Technique ◽  
Absorption Characteristics

Copper particles of sizes in the range 3.1 to 11.4 nm have been grown within gel compositions of the system CuO–SiO2 by an electrodeposition process applying voltages varying from 5 to 15 V. Composite films of these metal particles dispersed in a polystyrene matrix have been prepared on Corning No. 7059 glass slides by a dip-coating technique and their optical absorption characteristics have been delineated. The spectra show maxima at wavelengths in the range 380 to 470 nm, depending on the particle size. The results have been analyzed using the Mie theory. The electrical conductivity as extracted from this analysis is found to have reasonable correspondence with data reported earlier for copper nanoparticles in glass-ceramic systems.

Anisotropy Influence on Hysteresis and Additional Loss in Silicon Steel Sheets

2005 ◽  
Vol 76 (6) ◽  
pp. 450-454 ◽  
Author(s):  
Anthony J. Moses ◽  
Wojciech A. Pluta
Keyword(s):  
Silicon Steel ◽  
Steel Sheets ◽  
Additional Loss
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