Development of optical gas sensors for emission monitoring

N. J. Vasa, I. A. Palani, Rajesh Kona, M. Singaperumal

Abstract

The global increase in N2O and CO2 levels, which contribute to the greenhouse effect, has been attributed to combustion of biomass and fossil fuels. An optical sensor system capable of measuring concentrations of these species and O2 might be incorporated into combustion-control applications to reduce pollutant emissions and increase fuel efficiency. In addition to measuring the gases in the atmosphere and pollution from traffic and industry, it is important to monitor the work environment, industrial process. A compact, widely tunable coherent optical source based on a difference frequency generation technique in a quasi-phase-matched nonlinear crystal pumped by two single-frequency laser diodes for the detection of various gases is reported. A novel approach of using commercially available fibercoupled super-luminescent diode (SLD) along with a spectrometer is also proposed for such application.

Keywords

gas sensing; trace gas monitoring; difference frequency generation; PPLN; super luminescent diode (SLD)

Download

IMEKO-TC14-2007-38.pdf

DOI

-

IMEKO TC

TC14 - Measurement of Geometrical Quantities

Back to the proceedings