| Summary: | A series of experiments, in which the sample gas of a gas chromatograph has been perturbed with a pseudo-random binary sequence, is described. The detector response was cross correlated with the input to obtain the system impulse response, which, in this case, is proportional to the chromatogram. The experiments were carried out to determine the advantages and disadvantages of this technique compared with the conventional (single sample injection) method, and it is concluded that, while the technique is most unlikely to be used as a straight replacement for the conventional method, it could prove useful where a rapid qualitative indication of a composition change is required.
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