Working resolution of 0.010 cm(-1) between 20 cm(-1) and 1200 cm(-1) by a Fourier spectrometer.
The original double-beam Michelson-type Fourier spectrometer at the University of Oulu has been partly modified so that a maximum resolution of slightly better than 0.010 cm(-1) between 20 cm(-1) and 1200 cm(-1) can be obtained. The resolution is determined as a halfwidth of an observed line. The accuracy of the line position is 0.0005 cm(-1) in favorable conditions. The Fourier spectrometer is connected on-line to a minicomputer, in order to make the fast Fourier transforms of interferograms of up to 10(6) sampling points. The maximum optical path difference of the interferometer is about 1.5 m, giving a maximum theoretical resolution of 0.004 cm(-1).