Triple modulation experiment for a fourier transform...

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G01N 21/45 (2006.01) G01J 3/453 (2006.01) G01J 3/28 (2006.01)

Patent

CA 2212080

For a step-scanning Fourier transform spectrometer comprising an interferometer, a detector, and a digital signal processor (DSP), a method for measuring a response of a sample to multiple modulations is disclosed. In one embodiment, the method comprises the steps of utilizing the DSP to measure a phase modulation angle and a sample modulation angle; obtain an interferogram that corresponds to a calibrated static sample response by using the measured phase modulation rotation angle; obtain another interferogram which corresponds to the calibrated dynamic sample response by using both the measured phase and sample modulation rotation angles; and computing one or more spectra from the interferograms which indicates the calibrated response of said sample to the multiple modulations.

Méthode conçue pour un spectromètre par transformation Fourier à balayage progressif comprenant un interféromètre, un détecteur et un processeur de signal numérique (DSP), afin de mesurer la réponse d'un échantillon à des modulations multiples. Dans une version, la méthode comprend les étapes suivantes : utiliser le DSP pour mesurer un angle de modulation de phase et un angle de modulation d'échantillon; obtenir un interférogramme qui correspond à une réponse d'échantillon statique étalonnée en utilisant l'angle de rotation de modulation de phase mesuré; obtenir un autre interférogramme qui correspond à la réponse d'échantillon dynamique étalonnée en utilisant les angles mesurés de rotation de modulation d'échantillon et de modulation de phase; et calculer un ou plusieurs spectres à partir des interférogrammes, indiquant la réponse étalonnée dudit échantillon à des modulations multiples.

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