Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Innovative sensor technology for industrial applications

08.10.2007
In many industrial application areas so-called multiphase flows determine efficiency and safety issues of processes and plants. Everyone might know such flows from carbonated soft drinks, where after opening a bottle carbon dioxide bubbles rise in the liquid.

In the industry multiphase flows occur, for instance, in chemical reactors, power plants and turbo machinery. At the Forschungszentrum Dresden-Rossendorf a new sensor was recently developed which enables for the first time measurement and visualization of complex flows of arbitrary substance mixtures with high spatial and temporal resolution.

The analysis and modeling of industrial processes with methods of the experimental and theoretical thermal fluid dynamics is one of the tasks of the Institute of Safety Research at the Forschungszentrum Dresden-Rossendorf (FZD). Within the context of this work the new capacitance wire-mesh sensor was developed. This new sensor is a successor of the well known conductivity wire-mesh sensor, which was also developed at FZD and is currently being employed around the world. The conductivity wire mesh-sensor is based on the measurement of electrical conductivity in a flow cross-section and therefore only suited for the investigation of flow mixtures with an electrically conductive component, for example water-steam flows. The new capacitance wire-mesh sensor is now able to measure arbitrary substances, such as oil or other organic fluids. In this way, this sensor is applicable in a number of new fields, for example in process engineering and oil industry.

As the conductivity wire-mesh sensor the capacitance wire-mesh sensor consists of a set of wire electrodes stretched across a vessel or pipe in two slightly separated planes. Within one plane electrodes run in parallel whereas electrodes of different planes are perpendicular to each other. Thus, a grid of electrodes is formed in the cross-section (see figure). An associated electronics measures the electrical capacitance in all crossing points, which in turn is a measure of the dielectric constant of the substance surrounding each crossing point (the dielectric constant represents the extent to which a material concentrates the electrical field). The electronics is optimized to measure the tiny electrical capacitances of the crossing points which are in the range of only few Femtofarad (10-15 F).This can be done at very high time resolution of up to 10000 frames per second. Since different substances have different dielectric constant values, the sensor can discriminate phases or components. As an example the figure below shows a slug flow of air with a dielectric constant of 1 and silicone oil with a value of 2.7 in a pipe. Although the dielectric constants values of the two substances are rather close to each other, they are precisely distinguished by the capacitance wire-mesh sensor.

The capacitance wire-mesh sensor from the Forschungszentrum Dresden-Rossendorf may be employed in industrial applications where complex flow conditions are to be investigated. It does not require optical access to the flow as other measurement techniques do. The results of this work were recently published in the journal “Measurement Science and Technology”.

Christine Bohnet | alfa
Further information:
http://www.fzd.de
http://www.fz-rossendorf.de

More articles from Power and Electrical Engineering:

nachricht Researchers pave the way for ionotronic nanodevices
23.02.2017 | Aalto University

nachricht Microhotplates for a smart gas sensor
22.02.2017 | Toyohashi University of Technology

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Stingless bees have their nests protected by soldiers

24.02.2017 | Life Sciences

New risk factors for anxiety disorders

24.02.2017 | Life Sciences

MWC 2017: 5G Capital Berlin

24.02.2017 | Trade Fair News

VideoLinks
B2B-VideoLinks
More VideoLinks >>>