Wavelength modulation spectroscopy method

Details Wavelength modulation spectroscopy method Wavelength modulation spectroscopy method

2007-07-31

2007-07-31

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

For light transmission or absorption

Of fluent material

Reexamination Certificate

active

11011691

ABSTRACT:
A wavelength modulation spectroscopy method for measuring the concentration of a gas component is provided. A gas sample portion of the light is passed through a reference gas comprising the gas component in a constant concentration. Afterwards, the light is detected by a reference detector. Another portion of the light is passed through the gas sample and thereafter to a measuring detector. The light emitted by the light source is modulated with a frequency, while the wavelength is swept over a molecular absorption line of the gas component. Demodulation of the detector outputs is made at a higher harmonic. In order to compensate for variations of the modulation parameters of the light source in real time, a mathematical description of the demodulated reference detector output based on Fourier analysis of the modulated light and on a mathematical expression for the absorption line is provided.

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Pawel Kluczynski and Ove Axner, “Theoretical description based on Fourier analysis of wavelength-modulation spectrometry in terms of analytical and background signals”, Applied Optics, Optical Society of America, Washington, US, vol. 38, No. 27, Sep. 20, 1999, pp. 5803-5815, XP001176660.
Joel A. Silver, “Frequency-modulation spectroscopy for trace species detection: theory and comparison among experimental methods”, Applied Optics, Optical Society of America, Washington, US, vol. 31, No. 6, Feb. 20, 1992, pp. 707-717, XP000248585.

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