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Fibre optic gas sensing

Project is focused on development of a miniaturised integrated sensor system which will be applied for co2 detection. The sensor is based on fibre optic and/or planar components built in fully portable system. The miniaturised sensor system will be controlled and data will be evaluated by a pc.

Optical sensors for detection of gases or dissolved gases such as carbon dioxide have been explored. This kind of optical sensors can be used for variety of applications e.g. for a measurement of carbon dioxide concentration in industry, chemistry, and medicine. Classical approaches for concentration measurements often use an external optical source and spectral analyzer for measurements of spectral changes. These approaches imply large, expensive solution which further means complicated portability of such measuring system. The project is focused on development of a novel type of miniaturized integrated sensor system which will be applied for carbon dioxide detection. The sensor will be based on fibre optic and/or semiconductor parts built in fully portable system. Whole this sensor system will be controlled by a personal computer. By solving technological approaches i.e. semiconductor chip and fibre technology, the background for different fibre-optic components with integrated optical source(s) and detector(s) on chip will be determined. The key parts of a novel optical sensor system are: optical chemical transducer, fibre optic components, and semiconductor chip (sensing head) controlled by a PC. The principle of concentration measurements in the project is based on spectral (colour) changes of a sensitive layer caused by different concentrations of carbon dioxide. An optical-chemical transducer whose optical absorption changes due to interaction with carbon dioxide will be used for these measurements of carbon dioxide. Based on previous experience of the project team the transducer (sensitive layer) will be experimentally investigated in the project together with a suitable matrix for its immobilization onto transparent substrates. The sensitive and selective layer can be prepared by the dip-coating technique. In principle, the immobilized transducer reacts to concentration changes of gaseous analyte (carbon dioxide) which can be determined from absorption changes of the transducer spectra. In the project, the absorption changes will be detected with an optical fibre. It means that the optical-chemical transducer and optical fibre will be employed as a sensing tool for gaseous carbon dioxide detection. The detection of carbon dioxide through sensitive layers will be based on evanescent wave principles. This sensing tool will be connected with a sensor head (semiconductor chip). A light source (LED diode) with defined band width and detector (PIN diode) will be integrated in the sensor head. Light sources will be designed to the spectral range of absorption changes of the transducer. Band pass filters can be employed for optical signal filtering. This part of the sensor system will be miniaturized to dimensions of about 100 mm2. The sensor head should be connected with optical fibres with defined light coupling. PIN diodes will be used as optical-electrical units which transform output signals from optical fibre. Spectral changes i.e. information about carbon dioxide concentrations will be further processed and displayed by a PC. All parts will be assembled into a prototype of the miniaturized sensor system which functionality will be tested.
Acronym: 
FOGS
Project ID: 
5 839
Start date: 
01-01-2011
Project Duration: 
48months
Project costs: 
1 380 000.00€
Technological Area: 
Sensor Technology related to measurements
Market Area: 
Other measuring devices (including infrared gas analysers, moisture analysers)

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