Simulation of short-path high-precision industrial gas sensors using DFB diode lasers and Fourier transform absorbance ratio analysis and control methods

Gary E. Kidd

doi:10.1117/12.372930

9 December 1999 Simulation of short-path high-precision industrial gas sensors using DFB diode lasers and Fourier transform absorbance ratio analysis and control methods

Gary E. Kidd

Author Affiliations +

Proceedings Volume 3859, Optical Online Industrial Process Monitoring; (1999) https://doi.org/10.1117/12.372930
Event: Photonics East '99, 1999, Boston, MA, United States

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.

Citation Download Citation

Gary E. Kidd "Simulation of short-path high-precision industrial gas sensors using DFB diode lasers and Fourier transform absorbance ratio analysis and control methods", Proc. SPIE 3859, Optical Online Industrial Process Monitoring, (9 December 1999); https://doi.org/10.1117/12.372930

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