Public Release: 

Scientists developed a miniature gas sensor for mobile devices

Applications from monitoring air quality to healthcare & wellness

VTT Technical Research Centre of Finland

VTT Technical Research Centre of Finland has developed a miniature gas sensor that can be connected to mobile devices. Gas measurements made with smartphones will make activities such as the detection of internal air problems easier. In addition, sleep quality will be measurable with greater precision, using mobile healthcare applications which gauge carbon dioxide quantities.

Many sensor developers are interested in using smartphones to measure gas concentrations.

"This is probably due to the spread of the Internet of Things (IoT), which enables indirect observations of a range of environmental factors based on data gathered from single sensors or sensor networks. Many day-to-day issues, such as precision and efficiency in the workplace, can depend on carbon dioxide levels and internal air quality," says Anna Rissanen, leader of the VTT research team.

Using a mobile device to measure carbon dioxide will also enable new applications for smartphones: for example, sleep quality can be monitored by measuring the sleeper's exhalations.

The miniaturised gas sensor is based on Fabry-Pérot interferometers (FPI) - adjustable optical filters. Over the years, VTT has developed these for various spectroscopy-based applications, such as hyperspectral cameras for nanosatellite- and drone-based environmental monitoring, the early detection of skin cancer and fuel analysis for emission minimisation.

The tiny gas sensor developed by team's senior scientist Rami Mannila is based on channelling light through the sample being analysed. Penetrability at various light wavelengths can be used to determine the composition of the compound. Carbon dioxide is identified based on its strong absorption of light at a wavelength of 4.2 μm. In addition, a corresponding sensor technology can be used to simultaneously differentiate and detect other gases or substances based on the spectrum of their absorption peaks at various infra-red wavelengths.

MEMS sensor technology can be mass produced, enabling the manufacture of new types of large-volume products based on the spectral analysis of substances. Thanks to microspectrometers and other optical devices, VTT is creating new kinds of business and expertise for Finland: the start-up, Spectral Engines, which provides spectral sensors based on FPI technology, has already been established on the basis of microspectrometer technology. VTT Memsfab, on the other hand, offers manufacturing services of MEMS chips.

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Media material: http://www.vttresearch.com/media/news/scientists-developed-a-miniature-gas-sensor-for-mobile-devices

For more information, please contact:

VTT Technical Research Centre of Finland Ltd
Anna Rissanen, Research Team Leader, Microspectrometers
Tel. +358 (0)40 8201972, anna.rissanen@vtt.fi

VTT Technical Research Centre of Finland Ltd
Philippe Monnoyer, Head of Research Area, Silicon Microsystems
Tel. +358 400 912 446, philippe.monnoyer@vtt.fi

Further information on VTT:

Milka Lahnalammi-Vesivalo
Communications manager
358 40 5457 828
milka.lahnalammi-vesivalo@vtt.fi
http://www.vtt.fi

VTT Technical Research Centre of Finland Ltd is the leading research and technology company in the Nordic countries. We use our research and knowledge to provide expert services for our domestic and international customers and partners, and for both private and public sectors. We use 4,000,000 hours of brainpower a year to develop new technological solutions.

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