Wspólnotowy Serwis Informacyjny Badan i Rozwoju - CORDIS

Integrated optical sensor based on the grating coupler and m-line shift measurement for HC (butane or propane) detection

Integration of an optical sensor head based on the grating coupler and m-line shift measurement allowing butane or propane detection in the range of 100 to 1000 ppm.

CR9 IF performed the integration of a sensor head for the detection of HC gases. The basic idea was to use a grating coupler allowing light to be coupled into a waveguide, this waveguide being covered by the gas sensitive layer.

When exposed to HC gases, the refractive index of the sensitive layer is slightly modified which results in a modification of the propagation conditions of light into the waveguide. This modification is detected by measuring, in the beam transmitted through the grating coupler, the angular shift of the m-line (mode line) corresponding to the light guided into the waveguide.

A polymer thin film (PHMS film) developed by Thales TRT has been selected to be deposited on top of the grating coupler and tested into the integrated sensor head. A software application, under Labview environment, has been specifically developed to perform data acquisition and processing. 1000 ppm of propane or butane diluted in nitrogen or dry air has been detected by the grating coupler sensor head.

It has also been demonstrated that the PHMS film can be used to optically detect HC gases down to 100 ppm. Furthermore, this polymer is not sensitive to perturbations by other gases such as ozone.

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Universte Paul Cezanne Aix Marseille III
Case 231
13397 Marseille cedex 20
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