METHOD FOR DISPERSIVE FOURIER-TRANSFORM SPECTROMETRY IN CONTINUOUS BROADBAND EMISSION Russian patent published in 2012 - IPC G01J3/45 

FIELD: physics.

SUBSTANCE: method involves placing on each arm of a double-arm interferometer one identical sealed container with transparent windows, in one of which in the measuring arm a transparent sample of the analysed substance is placed. The container of the reference arm holds a reference body whose thickness is equal to that of the sample, said body being made from a substance whose refraction index n₀ monotonously depends on radiation frequency and differs from that of the analysed substance n within the emission band by not more than a value (n-n₀)=λ_min/a, where a is the distance travelled by radiation in the sample, λ_min is the minimum radiation wavelength. Radiation is passed through both containers and a fringe pattern is discretely recorded, said fringe pattern being formed at the output of the interferometer due to variation in difference between optical paths of radiation in the reference and measuring arms according to a given law. The obtained fringe pattern is processed via full Fourier transform.

EFFECT: invention increases accuracy of measurements and widens the range of analysed substances.

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