New gas sensors for monitoring carbon dioxide sinks

May 08, 2008
New gas sensors for monitoring carbon dioxide sinks
Functional principle of the membranbasierten Gassensors. A potential application of the new gas assensor is the monitoring of carbon dioxide storage from power plants. Credit: Source: Susan Waiter/UFZ

A novel gas sensor system makes it possible to monitor large areas cost-effectively the first time. The patented gas sensor is based on the principle of diffusion, according to which certain gases pass through a membrane faster than others.

Using a tube-like sensor it is possible to measure an average gas concentration value over a certain distance without influencing or distorting conditions in the measuring environment. If such sensors are laid in a particular pattern, it is possible to calculate the concentration of a gas over an area. The measuring tube can therefore replace a large number of individual sensors, making it much cheaper than previous methods.

The sensor was developed at the Helmholtz Centre for Environmental Research (UFZ) and is being presented for the first time at the 15th International Trade Fair for Water – Sewage – Refuse - Recycling (IFAT), which is taking place from 5 to 9 May in Munich.

Potential fields of application for the membrane-based gas sensors ("MeGa") are environmental remediation and landfill monitoring. But in future the technology could also be used to monitor gas pipelines, the formation of hydrogen sulphide in waterbodies or the underground injection of carbon dioxide. The principle can also be used in liquids, so the probe is also useful for monitoring waterbodies, including groundwater, and for monitoring boreholes. The slimline construction of the borehole and waterbody probe means that it can be used in gauges. The (permanent) connection to the part above ground allows data capture/evaluation to take place while the probe is submerged. A device with these features has never previously been available anywhere in the world. Another potential field of application is process monitoring in water treatment or in the food industry, e.g. in breweries and dairies.

The researchers are hoping that in future their system can also contribute to more intelligent ventilation of indoor spaces. An excessive level of carbon dioxide leads to fatigue and health problems, while excessive ventilation means a waste of energy. In classrooms, lecture theatres of all kinds and in workplaces there are therefore recommendations for indoor air concentrations of 1000 and 3000 ppm. "Monitoring these indoor air concentrations has failed so far because of a lack of suitable, reasonably priced measuring methods linked to appropriate ventilation technology," explains Dr Detlef Lazik from the UFZ. "With our membrane-based gas sensors it is for instance possible to have decentralised ventilation using a ventilator that is controlled by a gas sensor.

The ventilation is then simply switched on if an adjustable threshold value is exceeded." The same principle can be used for monitoring dangerous substances in buildings and facilities.

Source: Helmholtz Association of German Research Centres

Explore further: Entrepreneur builds a sleek ship, but will anyone buy it?

add to favorites email to friend print save as pdf

Related Stories

Rolling lab tracks methane to its source

Dec 19, 2014

McHenry Township, Lycoming County. Equipped with a gray box, a map and an SUV, Thomas Lauvaux and a team from Penn State's Department of Meteorology has been at it for hours, taking measurements and racking ...

The RV Investigator's role in marine science

Dec 12, 2014

We know more about the surface of the moon than we do about our deepest oceans, and only 12% of the ocean floor within Australia's Exclusive Economic Zone has so far been mapped.

Laser sniffs out toxic gases from afar

Dec 03, 2014

Scientists have developed a way to sniff out tiny amounts of toxic gases—a whiff of nerve gas, for example, or a hint of a chemical spill—from up to one kilometer away.

Recommended for you

Off-world manufacturing is a go with space printer

Dec 20, 2014

On Friday, the BBC reported on a NASA email exchange with a space station which involved astronauts on the International Space Station using their 3-D printer to make a wrench from instructions sent up in ...

First drone in Nevada test program crashes in demo

Dec 19, 2014

A drone testing program in Nevada is off to a bumpy start after the first unmanned aircraft authorized to fly without Federal Aviation Administration supervision crashed during a ceremony in Boulder City.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.