A novel, cost effective capacitive sensor for estimating dissolved moisture in transformer oil

2016 ◽  
Author(s):  
M. S. Mithun ◽  
Bibin Thankachan
Keyword(s):  
Cost Effective ◽  
Capacitive Sensor ◽  
Transformer Oil

scholarly journals Optimization of a Handwriting Method by an Automated Ink Pen for Cost-Effective and Sustainable Sensors

Chemosensors ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 264
Author(s):  
Florin C. Loghin ◽  
José F. Salmerón ◽  
Paolo Lugli ◽  
Markus Becherer ◽  
Aniello Falco ◽  
...  
Keyword(s):  
Printed Electronics ◽  
Low Cost ◽  
Electronic Devices ◽  
Cost Effective ◽  
Capacitive Sensor ◽  
Fabrication Technique ◽  
Rfid Tag ◽  
Environmental Friendly ◽  
Fast Prototyping ◽  
Do It Yourself

In this work, we present a do-it-yourself (DIY) approach for the environmental-friendly fabrication of printed electronic devices and sensors. The setup consists only of an automated handwriting robot and pens filled with silver conductive inks. Here, we thoroughly studied the fabrication technique and different optimized parameters. The best-achieved results were 300 mΩ/sq as sheet resistance with a printing resolution of 200 µm. The optimized parameters were used to manufacture fully functional electronics devices: a capacitive sensor and a RFID tag, essential for the remote reading of the measurements. This technique for printed electronics represents an alternative for fast-prototyping and ultra-low-cost fabrication because of both the cheap equipment required and the minimal waste of materials, which is especially interesting for the development of cost-effective sensors.

scholarly journals Closed-loop feedback control for microfluidic systems through automated capacitive fluid height sensing

2017 ◽  
Author(s):  
L. R. Soenksen ◽  
T. Kassis ◽  
M. Noh ◽  
L.G. Griffith ◽  
D.L. Trumper
Keyword(s):  
Feedback Control ◽  
Closed Loop ◽  
Cost Effective ◽  
Capacitive Sensor ◽  
Open Loop ◽  
Small Scale ◽  
Microfluidic Systems ◽  
Wide Range ◽  
Loop Feedback ◽  
Closed Loop Feedback

AbstractPrecise fluid height sensing in open-channel microfluidics has long been a desirable feature for a wide range of applications. However, performing accurate measurements of the fluid level in small-scale reservoirs (<1mL) has proven to be an elusive goal, especially if direct fluid-sensor contact needs to be avoided. In particular, gravity-driven systems used in several microfluidic applications to establish pressure gradients and impose flow remain open-loop and largely unmonitored due to these sensing limitations. Here we present an optimized self-shielded coplanar capacitive sensor design and automated control system to provide submillimeter fluid-height resolution (~250 μm) and control of small-scale open reservoirs without the need for direct fluid contact. Results from testing and validation of our optimized sensor and system also suggest that accurate fluid height information can be used to robustly characterize, calibrate and dynamically control a range of microfluidic systems with complex pumping mechanisms, even in cell culture conditions. Capacitive sensing technology provides a scalable and cost-effective way to enable continuous monitoring and closed-loop feedback control of fluid volumes in small-scale gravity-dominated wells in a variety of microfluidic applications.

Enhanced thermal conductivity of nanofluids made of metal oxide nanostructures synthesized by arc discharge method

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040001
Author(s):  
F. Fang ◽  
J. Futter ◽  
E. Hutchinson ◽  
J. Leveneur ◽  
J. Kennedy
Keyword(s):  
Thermal Conductivity ◽  
Metal Oxide ◽  
Ball Milling ◽  
Zno Nanoparticles ◽  
Arc Discharge ◽  
Cost Effective ◽  
Transformer Oil ◽  
Oxide Nanostructures ◽  
Metal Oxide Nanostructures ◽  
Enhanced Thermal Conductivity

We have modified the mineral oil used in transformers by dispersing 1-wt.% metal oxide nanostructures (commercially available [Formula: see text], ZnO and [Formula: see text] spherical structures and ZnO rod-shaped structures synthesized by arc discharge) into the oil through ball milling without surfactant. A good dispersion that lasted for at least 24 h was obtained for all nanofluids, however sedimentation was discovered by 72 h after ball milling. All nanofluids with different nanostructures exhibited enhanced thermal conductivity compared with the raw transformer oil. The nanofluid with ZnO nanoparticles showed better thermal conductivity than the nanofluids with [Formula: see text] and [Formula: see text] nanoparticles. The nanofluid with elongated ZnO nanoparticles (nanorods) synthesized by arc discharge showed the best thermal conduction among all the nanofluids studied in this work over the whole measurement period. The enhanced thermal conductivity of the nanofluid with elongated nanostructure is considered to be due to the rod-shaped nanostructure creating heat flow paths with lower thermal resistance. The arc discharge provides a cost-effective and scalable method to fabricate metal oxide nanostructures for potential nanofluid applications.

An MIP-Based Novel Capacitive Sensor to Detect 2-FAL Concentration in Transformer Oil

2018 ◽  
Vol 18 (19) ◽  
pp. 7924-7931 ◽  
Author(s):  
MD. Manzar Nezami ◽  
Shufali Ashraf Wani ◽  
Shakeb A. Khan ◽  
Neeraj Khera ◽  
Shiraz Sohail
Keyword(s):  
Capacitive Sensor ◽  
Transformer Oil

A Capacitive Sensor for Detecting Insulation Degradation by Sensing 2-FAL in Transformer Oil

2020 ◽  
Vol 27 (6) ◽  
pp. 2179-2187
Author(s):  
Shufali Ashraf Wani ◽  
Md. Manzar Nezami ◽  
Shakeb A. Khan ◽  
Shiraz Sohail
Keyword(s):  
Capacitive Sensor ◽  
Transformer Oil ◽  
Insulation Degradation

scholarly journals Determination of pH in Powdered Concrete Samples or in Suspension

2019 ◽  
Vol 9 (16) ◽  
pp. 3257
Author(s):  
Goran Stojanović ◽  
Milan Radovanović ◽  
Dejan Krstić ◽  
Ivan Ignjatović ◽  
Jelena Dragaš ◽  
...  
Keyword(s):  
Parallel Plate ◽  
Ph Value ◽  
Cost Effective ◽  
Concrete Specimen ◽  
Capacitive Sensor ◽  
Reinforcement Corrosion ◽  
Electrode Structure ◽  
Interdigitated Electrode ◽  
Sensor Platforms

Concrete is a material that is widely used by mankind. Although different deterioration mechanisms can lead to degradation of the concrete itself, reinforcement corrosion is the biggest durability issue for reinforced concrete structures. One of the key parameters influencing the corrosion rate is pH value. Accordingly, this work presents two capacitive sensor platforms—one based on parallel plate electrodes and the other based on a planar interdigitated electrode structure. The first platform is used to determine whether the pH value is lower or higher than a predetermined limit (around 11) and this device was successfully tested using concrete suspensions. The second platform can determine the pH value by establishing a relationship between pH and measured capacitance from a powdered concrete specimen. Both multi-layered platforms were manufactured by means of a cost-effective xurography technique, which provides technically and mechanically robust structures very quickly.

scholarly journals Bioremediation of soil polluted with crude oil and its derivatives: Microorganisms, degradation pathways, technologies

2012 ◽  
Vol 66 (2) ◽  
pp. 275-289 ◽  
Author(s):  
Vladimir Beskoski ◽  
Gordana Gojgic-Cvijovic ◽  
Jelena Milic ◽  
Mila Ilic ◽  
Srdjan Miletic ◽  
...  
Keyword(s):  
Crude Oil ◽  
Petroleum Hydrocarbons ◽  
Cost Effective ◽  
Petroleum Products ◽  
Transformer Oil ◽  
Ex Situ ◽  
Industrial Level ◽  
Oil Fuel ◽  
Biological Methods ◽  
Industrial Solvents

The contamination of soil and water with petroleum and its products occurs due to accidental spills during exploitation, transport, processing, storing and use. In order to control the environmental risks caused by petroleum products a variety of techniques based on physical, chemical and biological methods have been used. Biological methods are considered to have a comparative advantage as cost effective and environmentally friendly technologies. Bioremediation, defined as the use of biological systems to destroy and reduce the concentrations of hazardous waste from contaminated sites, is an evolving technology for the removal and degradation of petroleum hydrocarbons as well as industrial solvents, phenols and pesticides. Microorganisms are the main bioremediation agents due to their diverse metabolic capacities. In order to enhance the rate of pollutant degradation the technology optimizes the conditions for the growth of microorganisms present in soil by aeration, nutrient addition and, if necessary, by adding separately prepared microorganisms cultures. The other factors that influence the efficiency of process are temperature, humidity, presence of surfactants, soil pH, mineral composition, content of organic substance of soil as well as type and concentration of contaminant. This paper presents a review of our ex situ bioremediation procedures successfully implemented on the industrial level. This technology was used for treatment of soils contaminated by crude oil and its derivatives originated from refinery as well as soils polluted with oil fuel and transformer oil.

scholarly journals Transformer Oil Diagnosis Based on a Capacitive Sensor Frequency Response Analysis

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Jose M. Guerrero ◽  
Alejandro E. Castilla ◽  
Jose A. Sanchez-Fernandez ◽  
Carlos A. Platero
Keyword(s):  
Frequency Response ◽  
Capacitive Sensor ◽  
Transformer Oil ◽  
Response Analysis ◽  
Frequency Response Analysis
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