Digitisation of interferograms in Fourier transform spectroscopy

Details Digitisation of interferograms in Fourier transform spectroscopy Digitisation of interferograms in Fourier transform spectroscopy

1997-10-08

1999-06-22

Kim, Robert H.

Optics: measuring and testing

By particle light scattering

With photocell detection

356345, 356349, G01B 902

Patent

active

059147806

ABSTRACT:
Interferograms produced by a Michelson type interferometer used in Fourier Transform spectroscopy are processed by an arrangement which includes an analogue-to-digital converter (12) which is sampled by a fixed frequency clock signal to provide a digital representation of the interferogram. This signal is processed by a digital data processor (18) which also receives a digital representation of the reference fringe waveform to provide a digital output representing the interferogram. The digital representation of the reference fringe waveform may be produced by a second analogue-to-digital converter or by a timer. The analogue-to-digital converter may be arranged to produce oversampled representations of the interferogram or reference fringe waveforms. In one form of the invention the analogue-to-digital converter or converters include a delta sigma modulator.

REFERENCES:
patent: 4511986 (1985-04-01), Bellar et al.
patent: 5838438 (1998-11-01), Peale et al.
Applied Optics, vol. 35, No. 16, Jun. 1, 1996, pp. 2891-2896, XP000594917, Brault J.W.: "New approach to high-precision Fourier transform spectrometer design".
Applied Optics, vol. 32, No. 25, Sep. 1, 1993, pp. 4822-4827, XP000195635 Minami K. and KawataS.: "Dynamics range enhancement of Fourier transform infrared spectrum measurement using delta sigma modulation".
Proceedings of IEEE, vol. 69, No. 3, Mar. 3, 1981, pp. 300-331, XP000195636 Crochiere R. E. and Rabiner L.R.: "Interpolation and decimation of digital signals--a tutorial review".

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