Real-time fourier spectroscopy.
The operation and performance of a system to perform Fourier spectroscopy in real time is described. The interferogram is sampled and the spectrum is simultaneously synthesized by the summation of a series of cosine functions with amplitudes and frequencies determined by the sample points. A digital memory oscilloscope performs the summation, and the spectral distribution is presented at 1000 points. An error of 2% of the full scale output can be expected and is caused by several inaccuracies in the components of the system. Several ir spectra were investigated, and the results produced by the real-time system are compared with those obtained with a digital and a special purpose analog computer.
Hoffman
J E
JE