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Proceedings Paper

Simulation of short-path high-precision industrial gas sensors using DFB diode lasers and Fourier transform absorbance ratio analysis and control methods
Author(s): Gary E. Kidd
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Paper Abstract

Precision industrial gas sensor which operate at room temperature and pressures in the 100-1000 mbar range are simulated by using the characteristics of DFB GaAs/Sb based tunable diode lasers operating in the 1-5 micrometers band within a simple optical bench having an absorption path length of 1-5 cm and by using the Fourier transform absorbance ratio digital analysis and control methods to achieve resolutions in the sub ppmv range for gas mixtures. The direct detection absorption spectroscopy theory, methods and sensor structure are reviewed and newly developed analysis and control noise models are presented. Absolute precision in terms of gain accuracy and resolution relationships is presented for these methods. Simulation methods for the error terms are also presented. Digital simulation results on rejection of noise, fringes, laser power function and interference lines for H2O and CO2 sensor at selected wave numbers are presented.

Paper Details

Date Published: 9 December 1999
PDF: 11 pages
Proc. SPIE 3859, Optical Online Industrial Process Monitoring, (9 December 1999); doi: 10.1117/12.372930
Show Author Affiliations
Gary E. Kidd, Kware Software Systems, Inc. (Canada)

Published in SPIE Proceedings Vol. 3859:
Optical Online Industrial Process Monitoring
Robert J. Nordstrom; Wim A. de Groot, Editor(s)

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