オンライン可視・近赤外フーリエ分光装置
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概要
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Described is a Fourier transform spectrometer system which is on-line connected with a minicomputer in the visible and near infrared regions.In order to cover a relatively short wavelength region (0.4, -2.3 μm), we adopted a polarization interferometer which comprises two sheet polarizers and a Babinet-Soleil compensator made of crystal quartz.The compensator moves continuously about 30 mm along the hypotenuse by a linear precision cam driver, which produces the optical path difference of 110 μm.The spectral resolution is better than 60 cm<SUP>-1</SUP> at 1.5 μm.A PbS cell and a photomultiplier are employed alternately as a detector for this instrument in the near infrared and visible regions.A data processing is carried out by the minicomputer (HITAC 10) with 4 kilowords core memory and some interfaces.The signal from the detector, which is well known as an interferogram, is digitized.at a sampling rate of 1000 Hz, being averaged by multiple scanning.The stored interferogram is apodized and is Fourier transformed (D.F.T.) only for 60 seconds.The results of the computation are converted to analog signals and are fed to an X-Y pen recorder to give the spectrum.Owing to high efficiency of the optical system and the high S-N ratio, spectra of very low energy, e.g.the emission from thermally excited materials at about 100°C, were effectively obtained in short scanning time (1sec/1scan).The dispersion effect of Soleil compensator and its numerically correcting method are also mentioned.
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