Wavelength modulation spectroscopy method and system

Details Wavelength modulation spectroscopy method and system Wavelength modulation spectroscopy method and system

2006-10-03

2006-10-03

Rosenberger, Richard A. (Department: 2877)

Optics: measuring and testing

For light transmission or absorption

Of fluent material

Reexamination Certificate

active

07116422

ABSTRACT:
In a wavelength modulation spectroscopy method and system the light of a tunable light source is modulated with a frequency f0, while the wavelength is swept over an interaction feature of a sample to be measured. The light of the light source is passed to a sample for interacting and thereafter detected and demodulated at a higher harmonic Nf0.To suppress effects of fluctuations of the optical transmission of the system on the measurement, originating from varying dust loads, high temperature, gas turbulence etc. in the measurement path (3), a burst signal in form of an envelope modulated pilot tone is added to the modulation of the light (1) of the light source (2) synchronously with the wavelength sweeps at a wavelength outside the interaction feature of the sample. The injected burst signal is at the detection frequency Nf0, where N≧2, and is detected together with the measured spectrum from the sample and act as absorption normal, which the spectrum can be calibrated against.

REFERENCES:
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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, vol. 38, No. 27, Sep. 1999, pp. 5803-5815.

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