Hydrogen sensor based upon quadrupole absorption spectroscopy

Details Hydrogen sensor based upon quadrupole absorption spectroscopy Hydrogen sensor based upon quadrupole absorption spectroscopy

2007-11-20

2007-11-20

Lyons, Michael A. (Department: 2877)

Optics: measuring and testing

By light interference

Spectroscopy

C356S519000

Reexamination Certificate

active

11240190

ABSTRACT:
The disclosure describes an absorption spectroscopy method for sensing hydrogen gas in a sample atmosphere and an associated hydrogen sensor. A light beam, having a wavelength corresponding to a vibrational transition of hydrogen molecules from a ground vibration state to any excited rotational vibration state via a quadrupole interaction, is introduced into an optical cavity adapted to receive a sample atmosphere to be tested for the presence of hydrogen gas. The light is introduced into the cavity in an off-axis alignment to systematically eliminate cavity resonances, while preserving the absorption signal amplifying properties of such cavities. Hydrogen absorption is measured is terms of cavity output, as in the ICOS technique.

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Uwe Fink et al., “Frequency and Intensity Measurements on the Quadrupole Spectrum of Molecular Hydrogen”, Journal of Molecular Spectroscopy, vol. 18, 1965, pp. 384-395.
G.C. Bjorklund et al., “Frequency Modulation (FM) Spectroscopy”, Applied Physics B, vol. 32, 1983, pp. 145-152.
J. Michael Shull, “H2Resonance Fluorescence with Lyman-α”, Astrophysical Journal, vol. 224, Sep. 15, 1978, pp. 841-847.

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