TRIPLE-MODULATION EXPERIMENT FOR FOURIER TRANSFORM SPECTROSCOPY

    公开(公告)号:JPH10104074A

    公开(公告)日:1998-04-24

    申请号:JP24868997

    申请日:1997-09-12

    Inventor: CURBELO RAUL

    Abstract: PROBLEM TO BE SOLVED: To provide a measuring method of a spectrum response capable of shortening the period of time required for measurement. SOLUTION: A method is shown for measuring a spectrum response of a sample during test relative to a plurality of modulations including a phase modulation and a sample modulation by means of a step scanning Fourier transform spectrum meter including an interferometer 12, a detector 22, and a digital signal processor(DSP) 36. In one embodiment, this method is employed for obtaining a phase modulation angle and sample modulation angle in use of the DSP 36, obtaining interference images relative to a calibration stationary sample response by the use of the measured phase modulation rotational angle, and obtaining other images corresponding to the calibrated dynamic sample response with the use of both the rotational angles of the measured phase and sample modulation, thereby calculating one or more spectra from interference images that designate the sample calibration response relative to a plurality of modulations.

    PROCESSING METHOD FOR DIGITAL SIGNAL OF FOURIER TRANSFORM INFRARED SPECTROMETER

    公开(公告)号:JPH09288006A

    公开(公告)日:1997-11-04

    申请号:JP34716796

    申请日:1996-12-26

    Inventor: RAURU KAABERO

    Abstract: PROBLEM TO BE SOLVED: To obtain a processing method in which the spectrum of a desired signal is obtained by a method wherein the Fourier transform of a transient signal is subtracted from the Fourier transform of a composite signal from a detector. SOLUTION: A rear number part in the Fourier transform of a transient signal is subtracted from a real number part in the Fourier transform of a composite signal, and the in-phase component of a desired spectrum is derived. That is to say, Re X (Kamf)}=Re Y (Kpmf)}-Re S (Kpmf)}, where X (Kpmf) represents the value of the discrete Fourier transform (DFT) of a phase- modulated signal at a phase modulation frequency, and S (Kpmf) represents the value of the DFT of a step transient signal. The quadrature component of a desired spectrum is derived in the same manner with reference to an imaginary number part in a transform.

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