| 摘要 |
<p>Following and surveying the function of a unit fabricating a product and/or a near infrared spectrometer fed by the product, where the spectrometer delivers spectra comprising a series of absorbence values for different wavelengths, comprises: (i) recording the spectra from the near infrared spectrometer periodically in the form of numerical data; (ii) transforming the data from each spectrum mathematically to obtain transformed spectra; and (iii) obtaining a series of working spectra from these values from each transformed spectrum using a series of consecutive wavelengths characteristic of the product being made. In addition, the decomposition coefficients of each working spectrum are calculated in series, a limited number (n) of coefficients are chosen to perform a selection operation, a recomposed spectrum is formed by reconstructing each working spectrum using the selected coefficients, at least one indicator of good operation of the spectrometer and/or the fabrication unit is chosen using a mathematical expression combining the values of each working spectrum and the corresponding reconstructed spectrum, and the evolution of this indicator is followed over time.</p> |
