Developing MEMS electric current sensors for end use monitoring of power supply: Part VIII - segmentation design and empirical analysis of piezoelectric layers based on cantilever beam structure

2018 ◽  
Author(s):  
Yang Liu ◽  
Yang Chen ◽  
Dong F. Wang ◽  
Yuan Lin ◽  
Xu Yang ◽  
...  
Keyword(s):  
Electric Current ◽  
Empirical Analysis ◽  
Cantilever Beam ◽  
Power Supply ◽  
Beam Structure ◽  
Piezoelectric Layers ◽  
Current Sensors ◽  
End Use

Technologies for Electric Current Sensors

2017 ◽  
pp. 265-292
Author(s):  
G. Velasco-Quesada ◽  
A. Conesa-Roca ◽  
M. Román-Lumbreras
Keyword(s):  
Electric Current ◽  
Current Sensors

Low Voltage FGMOS Four Quadrants Analog Multiplier

2014 ◽  
Vol 918 ◽  
pp. 313-318
Author(s):  
Jesús de la Cruz-Alejo ◽  
L. Noe Oliva-Moreno
Keyword(s):  
Power Consumption ◽  
Power Supply ◽  
Low Voltage ◽  
Floating Gate ◽  
Cmos Process ◽  
Resistive Load ◽  
Analog Multiplier ◽  
Output Impedance ◽  
Cmos Transistors ◽  
Current Sensors

In this paper a low voltage FGMOS analog multiplier is proposed that uses a follower voltage flipped (FVF), which dominates its operation. In order to reduce the power supply of the multiplier, floating gate CMOS transistors (FGMOS) are used. Theoretical steps of the FVF design are presented together with its simulation. The output of the FVF is insensitive to the device parameters and is loaded with a resistive load. The multiplier design consists of two FVF cells, two current sensors FVF and one Gilbert cell multiplier. The results show that the proposed multiplied in a 0.13μm CMOS process exhibits significant benefits in terms of linearity, insensibility to device parameters, bandwidth and output impedance. The power supply is 0.8V and a power consumption of 181μW.

scholarly journals Non-linear piezoelectric fluidic energy harvesters: The mutual interaction of two oscillating cylinders

2020 ◽  
Vol 31 (20) ◽  
pp. 2378-2389
Author(s):  
Vahid Azadeh-Ranjbar ◽  
Yi Han ◽  
Niell Elvin ◽  
Yiannis Andreopoulos
Keyword(s):  
Cantilever Beam ◽  
Degrees Of Freedom ◽  
Bluff Body ◽  
Mutual Interaction ◽  
Bluff Bodies ◽  
Velocity Range ◽  
Freestream Velocity ◽  
Energy Harvesters ◽  
Piezoelectric Layers ◽  
Non Linear

The presence of a bluff body upstream of a cantilever beam promotes persistent, aero-elastic vibrations of the beam. Vortex-induced vibration in an array of two mutually interacting bluff bodies in such configurations undergoing two-degrees of freedom transverse oscillation has not been investigated before. In the present work, we have studied experimentally, the unsteady response of an array of two similar rigid cylinders, positioned side-by-side in reference to the freestream velocity, each one mounted on the upstream end of an elastic cantilever beam. By fitting the beams with piezoelectric layers, these configurations are converted to piezoelectric fluid energy harvesters (PFEH) that can extract small amounts of energy from the flow. Comparing the performance of linear (L-PFEH), non-linear (NL-PFEH), and a non-linear array (NLA-PFEH) of harvesters show that NLA-PFEH has the widest broadband operating velocity range and the greatest generated power followed by NL-PFEH and then L-PFEH. The maximum electric power output of NLA-PFEH was ~1000% greater than for NL-PFEH with a corresponding ~250% increase in the operating velocity range. Different cylinder configurations reveal the presence of hysteresis in the behavior of NLA-PFEH when the distance between the cylinders (so-called cylinder gap to diameter ratio), G/ D < 0.5. At large distances from each other ( G/ D ≥ 4), the two cylinders behave like independent, isolated harvester units with rather weak mutual interaction.

A New Dielectric Elastomer Sensor Based on Cantilever Beam Structure with Constant Strength

2014 ◽  
Vol 664 ◽  
pp. 279-283 ◽  
Author(s):  
Na Ni ◽  
Yin Wang ◽  
Fan Liu ◽  
Ling Zhang
Keyword(s):  
Cantilever Beam ◽  
Dielectric Elastomer ◽  
Capacitive Sensors ◽  
Capacitance Sensor ◽  
Beam Structure ◽  
Concentrated Force ◽  
New Device ◽  
High Elasticity ◽  
Constant Strength ◽  
Dielectric Polymer

Dielectric elastomer sensors are a new kind of capacitive sensors. They can be used to measure forces, pressures and deformations. The sensors have several advantages such as high elasticity and inexpensive fabrication compared with traditional sensors. In this paper, a new sensing device for measuring small concentrated force is proposed. The structure of the device is a cantilever beam with constant strength on which is fixed the dielectric membrane. The dielectric membrane is a capacitance sensor built with dielectric polymer coated with soft electrodes. When the cantilever beam is subjected to a concentrated force at its free end, the strain changed in the cantilever beam will induce the change in the capacitance of the membrane. According to the relation, the unknown concentrated force can be monitored by measuring the change in the capacitance. The testing results on the device show that the concentrated force at the free end of the cantilever beam is approximately proportional to the change in the capacitance. The prototype demonstrated the new device is capable of monitoring small concentrated force with prominent sensitivity.

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