Multiple-reflection optical gas cell

Details Multiple-reflection optical gas cell Multiple-reflection optical gas cell

1981-06-15

1983-10-18

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With raman type light scattering

356318, G01J 344

Patent

active

044102712

ABSTRACT:
A multiple-reflection optical cell for Raman or fluorescence gas analysis consists of two spherical mirrors positioned transverse to a multiple-pass laser cell in a confronting plane-parallel alignment. The two mirrors are of equal diameter but possess different radii of curvature. The spacing between the mirrors is uniform and less than half of the radius of curvature of either mirror. The mirror of greater curvature possesses a small circular portal in its center which is the effective point source for conventional F1 double lens collection optics of a monochromator-detection system. Gas to be analyzed is flowed into the cell and irradiated by a multiply-reflected composite laser beam centered between the mirrors of the cell. Raman or fluorescence radiation originating from a large volume within the cell is (1) collected via multiple reflections with the cell mirrors, (2) partially collimated and (3) directed through the cell portal in a geometric array compatible with F1 collection optics.

REFERENCES:
Benetti et al. "A New Optical System for Flame Spec. with Special Ref. to Thermally Assisted Anti-Stokes Fluorescence Applications", Applied Spectroscopy, vol. 25, #1, 1971, pp. 57-60.
Weber et al., J. Opt. Soc. Am., vol. 57 p. 19, 1967.
Anderson, "The Raman Effect", Marcel Decker Inc., New York, vol. 2, p. 581, 1973.
Witkowicz et al., Applied Optics vol. 14:3092 (1975).
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Welsh et al., J. Opt. Soc. Am., vol. 45 p. 338, 1955.
Hill et al., Applied Optics, vol. 13 p. 186, 1974.
Hill et al., Applied Optics, vol. 16, p. 2004, 1977.
Muller, Optik, 56:1, 1980.
Konetak et al., Acta Physica Academiae Scientiarum Hungaricae Tomus, 48(4), pp. 409-414, 1980.

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