Digital signal processing technique for a FT-IR spectrometer usi

Details Digital signal processing technique for a FT-IR spectrometer usi Digital signal processing technique for a FT-IR spectrometer usi

1996-01-04

1997-03-18

Epps, Georgia Y.

Optics: measuring and testing

By particle light scattering

With photocell detection

356345, 25033908, G01B 902

Patent

active

056127847

ABSTRACT:
By considering a transient signal as merely another signal in a linear, shift-invariant system representing a step-scanning Fourier transform spectrometer, the present invention characterizes the transient signal and then compensates for its effect on the measurement by employing various signal processing techniques. Thus, according to one aspect of the present invention, it provides a method for obtaining the spectrum of the desired signal by subtracting the Fourier transform of the transient signal from the Fourier transform of the composite signal output from the detector (i.e., the signal containing both the desired signal and the transient signal). According to another aspect of the present invention, it provides a method for deriving an estimate of the Fourier transform of the transient signal from the Fourier transform of the composite signal.

REFERENCES:
M.J. Smith, C.J. Manning, R.A. Palmer and J.L. Chao; "Step Scan Interferometry in the Mid-Infrared With Photothermal Detection," Applied Spectroscopy, vol. 42, No. 4, 1988, pp. 546-555.
C.J. Manning and P.R. Griffiths; "Step-Scanning Interferometer With Digital Signal Processing," Applied Spectroscopy, vol. 47, No. 9, 1993, pp. 1345-1349.
R. Rubinovitz, J. Seebode and A. Simon; "Step-Scan Technique for middle Infrared Spectroscopy," FT-IR, pp. 33-38.

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