Fourier transform spectrometer

摘要

The present invention relates to a high signal-to-noise (S/N) ratio Fourier transform spectrometer by reducing A/D converter noise. In a Fourier transform spectrometer which measures the interference light of a measured light and determines the spectra of the measured light through implementation of a Fourier transform on this measured result using a means of computation control, the present invention provides a light-receiving means; a low-gain channel and a high-gain channel, which convert to and retain as digital signals the output of this light-receiving means; and the above means of computation control (CPU) which determines the correlation equation between the low-gain and high-gain channels and substitutes the low-gain channel output converted using the above correlation equation for the saturated portion of the high-gain channel output. <IMAGE>