Abstract
Abstract In this paper, advantage is take of the fact that the absorption spectra for several gases in the ultraviolet and visible spectral ranges are of a periodic nature. Since any waveform that is a periodic function of time or distance can be sampled unambiguously using a minimum sampling frequency dependent on the frequency content of the periodic function, but always larger than or equal to twice the bandwidth of the system, the Nyquist cirterion, we can calculate the concentration and separate different gases from each other with Fourier transform analysis. This method turns out to exhibit high sensitivity, good separation capacity, good accuracy and good robustness against wavelength displacements in the spectrum obtained.
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