scholarly journals Enhanced Sensitivity of FeGa Thin-Film Coated SAW Current Sensor

2021 ◽  
Vol 11 (24) ◽  
pp. 11726
Author(s):  
Yuan Sun ◽  
Yana Jia ◽  
Yufeng Zhang ◽  
Lina Cheng ◽  
Yong Liang ◽  
...  
Keyword(s):  
Thin Film ◽  
Delay Line ◽  
Propagation Path ◽  
Current Sensor ◽  
Applied Current ◽  
Enhanced Sensitivity ◽  
Magnetostrictive Strain ◽  
Oscillation Loop ◽  
Working Principle ◽  
The Magnetic Field

A surface acoustic wave (SAW) device is proposed for sensing current by employing the patterned FeGa thin film as the sensitive interface. The layered media structure of FeGa/SiO2/LiNbO3 was established to reveal the working principle of the sensors, and an SAW chip patterned by delay-line and operating at 150 MHz was fabricated photolithographically on 128° YX LiNbO3 substrate. The FeGa thin film with a larger magnetostrictive coefficient was sputtered onto the acoustic propagation path of the SAW chip to build the sensing device. The prepared device was connected into the differential oscillation loop to construct the current sensor. The FeGa thin film produces magnetostrictive strain and so-called ΔE effect at the magnetic field generated by the applied current, which modulates the SAW propagation velocity accordingly. The differential frequency signal was collected to characterize the measurand. Larger sensitivity of 37.9 kHz/A, low hysteresis error of 0.81%, excellent repeatability and stability were achieved in the experiments from the developed sensing device.

scholarly journals Development of a High Stability Pd-Ni Alloy Thin-Film Coated SAW Device for Sensing Hydrogen

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3560 ◽  
Author(s):  
Wen Wang ◽  
Xueli Liu ◽  
Shengchao Mei ◽  
Mengwei Liu ◽  
Chao Lu ◽  
...  
Keyword(s):  
Thin Film ◽  
High Sensitivity ◽  
Hydrogen Sensor ◽  
Fast Response ◽  
Propagation Path ◽  
Alloy Thin Film ◽  
Optimal Parameters ◽  
Ni Alloy ◽  
Oscillation Loop ◽  
Coated Surface

A Pd-Ni alloy thin-film coated surface acoustic wave (SAW) device is proposed for sensing hydrogen. The Pd-Ni thin-film was sputtered onto the SAW propagation path of a SAW device with a delay line pattern to build the chip-sized hydrogen sensor. The prepared sensor chip was characterized by employing a differential oscillation loop. The effect of the Pd-Ni film thickness on sensing performance was also evaluated, and optimal parameters were determined, allowing for fast response and high sensitivity. Excellent working stability (detection error of 3.7% in half a year), high sensitivity (21.3 kHz/%), and fast response (less than 10 s) were achieved from the 40 nm Pd-Ni alloy thin-film coated sensing device.

Enhanced Sensitivity of Surface Acoustic Wave (SAW) Current Sensor Based on TbDyFe Thin Film

2021 ◽  
Author(s):  
Yuan Sun ◽  
Wen Wang ◽  
Lina Cheng ◽  
Yana Jia ◽  
Yong Liang ◽  
...  
Keyword(s):  
Thin Film ◽  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Current Sensor ◽  
Enhanced Sensitivity

scholarly journals Moving Pearl Vortices in Thin-Film Superconductors

2021 ◽  
Vol 6 (1) ◽  
pp. 4
Author(s):  
Vladimir Kogan ◽  
Norio Nakagawa
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Time Dependent ◽  
Superconducting Thin Film ◽  
Self Energy ◽  
London Equation ◽  
The Magnetic Field

The magnetic field hz of a moving Pearl vortex in a superconducting thin-film in (x,y) plane is studied with the help of the time-dependent London equation. It is found that for a vortex at the origin moving in +x direction, hz(x,y) is suppressed in front of the vortex, x>0, and enhanced behind (x<0). The distribution asymmetry is proportional to the velocity and to the conductivity of normal quasiparticles. The vortex self-energy and the interaction of two moving vortices are evaluated.

Integrated Magnetic Sensing of Electrostatically Actuated Thin-Film Microbridges

2002 ◽  
Vol 729 ◽  
Author(s):  
J. Gaspar ◽  
Haohua Li ◽  
P.P. Freitas ◽  
V. Chu ◽  
J.P. Conde
Keyword(s):  
Thin Film ◽  
Low Temperatures ◽  
Counter Electrode ◽  
Spin Valve ◽  
Metal Gate ◽  
Electrostatically Actuated ◽  
Glass Substrates ◽  
Hydrogenated Amorphous ◽  
Bridge Length ◽  
The Magnetic Field

AbstractBilayer microbridges of aluminum and hydrogenated amorphous silicon are fabricated using thin film technology and surface micromachining at low temperatures on glass substrates. The microstructure is electrostatically actuated by applying a voltage between the bridge and a metal gate counter electrode placed beneath it. The movement is measured with a precision close to 0.1 Å by sensing the magnetic field of a permanent magnet, deposited and patterned on top of the microbridge, with an integrated spin valve magnetic sensor. The deflection of the bridge is at the same time monitored using an optical setup. The deflection of the structures is studied as a function of the driving applied gate voltage and bridge length and experimental results are analyzed with an electromechanical model.

Thin-Film HTS delay-line filters

Cryogenics ◽  
1997 ◽  
Vol 37 (10) ◽  
pp. 671-679 ◽  
Author(s):  
F. Huang
Keyword(s):  
Thin Film ◽  
Delay Line

Thin film thickness sensor based on a new magnetostrictive delay line arrangement

1999 ◽  
Vol 76 (1-3) ◽  
pp. 156-161 ◽  
Author(s):  
E. Hristoforou ◽  
H. Chiriac ◽  
J.N. Avaritsiotis
Keyword(s):  
Thin Film ◽  
Film Thickness ◽  
Delay Line ◽  
Thin Film Thickness ◽  
Line Arrangement

An Open-Loop FBG-Based Magnetostrictive Current Sensor with Enhanced Sensitivity

2020 ◽  
Author(s):  
Alex Dante ◽  
Juan David Lopez ◽  
Ariadny da Silva Areas ◽  
Cesar Cosenza Carvalho ◽  
Regina Celia da Silva Barros Allil ◽  
...  
Keyword(s):  
Open Loop ◽  
Current Sensor ◽  
Enhanced Sensitivity

Piezo-phototronic effect for enhanced sensitivity and response range of ZnO thin film flexible UV photodetectors

2019 ◽  
Vol 125 (2) ◽  
pp. 024502 ◽  
Author(s):  
Wei Zhang ◽  
Dayong Jiang ◽  
Man Zhao ◽  
Yuhan Duan ◽  
Xuan Zhou ◽  
...  
Keyword(s):  
Thin Film ◽  
Zno Thin Film ◽  
Uv Photodetectors ◽  
Enhanced Sensitivity ◽  
Response Range

Differential Drive Servo Valve Based on MSMA

2012 ◽  
Vol 271-272 ◽  
pp. 858-862
Author(s):  
Chao Yu ◽  
Kui Sheng Chen ◽  
Shu Guang Fu
Keyword(s):  
Simulation Analysis ◽  
Structural Features ◽  
Paper Briefly ◽  
Servo Valve ◽  
Differential Drive ◽  
High Frequency Response ◽  
Low Field ◽  
Working Principle ◽  
Large Flow ◽  
The Magnetic Field

Aimed at the contradiction between high frequency response and large flow of servo valve, the paper puts forward a 2D servo valve with differential drive based on magnetic controlled shape memory alloy(MSMA). To realize large flow control, the valve-spool is set of flow increasing orifice to match the flow increasing window on the valve-sleeve. The paper briefly introduces the structural features of the 2D servo valve and the working principle of the differential drive. It also has a simulation analysis on the magnetic field of the drive and the low field of the valve. Simulation results show that, the flow of the valve is linear with the input current.

Liquid-Phase Co-Exfoliated Graphene/MoS2 Nanocomposite for Methanol Gas Sensing

2015 ◽  
Vol 15 (10) ◽  
pp. 8004-8009 ◽  
Author(s):  
Shao-Lin Zhang ◽  
Hongyan Yue ◽  
Xishuang Liang ◽  
Woo-Chul Yang
Keyword(s):  
Thin Film ◽  
Gas Sensing ◽  
Synergetic Effect ◽  
Film Sensor ◽  
Thin Film Sensor ◽  
Sensor Material ◽  
Enhanced Sensitivity ◽  
Distinct Structure ◽  
Nanocomposite Sensor ◽  
Sensing Performance

We developed an efficient method to co-exfoliate graphite and MoS2 to fabricate graphene/MoS2 nanocomposite. The size, morphology, and crystal structure of the graphene/MoS2 nanocomposite were carefully examined. The as-prepared graphene/MoS2 nanocomposite was fabricated into thin film sensor by a facile drop casting method and tested with methanol gas in various concentrations. The sensitivity, response time, and repeatability of the graphene/MoS2 nanocomposite sensor towards methanol gas were systematically investigated. A pure MoS2− based thin film sensor was also prepared and compared with the nanocomposite sensor to better understand the synergetic effect in the sensing performance. Our research demonstrated that compositing MoS2 with graphene could overcome the shortcoming of MoS2 as a sensor material and bring in a promising gas-sensing performance with a quicker response/recovery time and an enhanced sensitivity. Moreover, this composited material with a distinct structure and an excellent electronic property is expected to have potential application in various fields, such as optoelectronic.

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