Contaminant identification and concentration determination by mo

Details Contaminant identification and concentration determination by mo Contaminant identification and concentration determination by mo

1998-10-02

1999-12-07

Evans, F. L.

Optics: measuring and testing

By particle light scattering

With photocell detection

25033913, 250343, G01N 2131

Patent

active

05999259&

ABSTRACT:
A method and apparatus for detecting the presence of a specific concentration of gaseous species within a calibrated range in a gas sample is disclosed. The ILS gas detection system of the present invention simply comprises an ILS laser, a wavelength-selective optical element, and an optical detector. However, the potential or operational wavelength bandwidth of the ILS laser is preferably entirely included within one of the absorption bands or regions assigned to the intracavity gaseous species being monitored. Thus, within the calibrated range, the presence of the gaseous species changes the output laser wavelength or output intensity at a specific wavelength of the ILS laser. Consequently, only the wavelength of the output or the output intensity at the specific wavelength of the ILS laser need be monitored in order to quantitatively determine the concentration of the absorbing gaseous species within a calibrated range when using the ILS method of the present invention.

REFERENCES:
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patent: 5689334 (1997-11-01), Atkinson et al.
patent: 5723864 (1998-03-01), Atkinson et al.
patent: 5747807 (1998-05-01), Atkinson et al.
D.A. Gilmore et al, "Intracavity laser spectroscopy in the 1.38-1.55 .mu.m spectral region using a multimode Cr.sup.4+ :YAG laser", Optics Communications, vol. 103, pp. 370-374 (1993).
D.A. Gilmore et al, "Intracavity absorption spectroscopy with a titanium: sapphire laser", Optics Communications, vol. 77, No. 5 & 6, pp. 385-389, Jul. 15, 1990.
G.H. Atkinson et al, "Intracavity laser spectroscopy", Proc. SPIE Int. Soc. Opt. Eng., No. 1637, pp. 126-133 (1992).
A. Kachanov, "Intracavity laser spectroscopy with vibronic solid-state lasers. I. Spectrotemporal transient behavior of a Ti:sapphire laser", Optical Society of America, vol. 11, pp. 2412-2419.

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