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Type: 
Conference
Description: 
The experimental characterization of an innovative optical system for detection of carbon monoxide (CO) is reported. In this system a photodetector based on gallium nitride (GaN) and an UV light source are integrated. The gas flows between the light source and the GaN photodetector. The UV light source consists of a spark produced by an arc discharge which induced transitions in the gas, causing a modification of the light intensity as a function of gas composition. These transitions modify the fraction of light in the UV spectral region which is detected by the GaN-photodetector, as a function of the species concentration. By virtue of its structural properties, gallium nitride (GaN) allows to operate at high temperature and high speed and to work in-situ in the exhaust manifold of combustion engines at temperatures as high as 600degC, at which the deposited organic residuals on the detector can be oxidized. This …
Publisher: 
IEEE
Publication date: 
12 Jun 2006
Authors: 

M Mello, A De Risi, A Passaseo, M Lomascolo, M De Vittorio

Biblio References: 
Pages: 433-436
Origin: 
2006 Ph. D. Research in Microelectronics and Electronics