| 主权项 |
1. Method of detecting the transition, between a first compound and a second compound, of a product, which may contain such a first compound and/or such a second compound, and which flows inside a conduit for conveying this product, characterized by the fact that:
an absorption spectrum was identified for each sample from a first plurality of samples from the first pure compound as well as for each sample of a plurality of samples from the second pure compound; from the absorption spectra identified through samples of the first and second pure compounds, we are able to determine at least one spectral marker, which is common to the first and second compounds, thus discriminating between the first and second compounds, and consisting of a function of a plurality of absorbances from such a spectrum; from the absorption spectra identified for the samples from the first and second pure compound, we can define at least one predetermined spectral marker, on the one hand, a first spectral box constituted by a first spectral range delimited by the values of at least one such spectral marker determined and corresponding to the first pure compound and, on the other hand, a second spectral box constituted by a second spectral range delimited by the values of at least one such spectral marker determined and corresponding to the second pure compound; inside the conduit for conveyance of the product, at least one absorption spectrum of the product flowing inside this conduit is identified; using at least one such absorption spectrum identified for the product flowing inside the conduit we can determine the value of at least one predetermined spectral marker for the first and second pure compounds; the spectral boxes corresponding to at least one spectral marker on a graph are shown which are for the first and second pure compounds; on the same graph, the value of the determined spectral marker(s) and corresponding to at least one absorption spectrum identified for the product flowing within the conduit for conveyance; for this product, the transition between the first and second compound is detected when one observes that the value of the spectral marker(s) which are determined and corresponding to this product, moves away from the first spectral box and/or approaches the second spectral box, or corresponds to this second spectral box. |
