Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Chemical analysis
Patent
1997-04-09
2000-05-30
Hoff, Marc S.
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Chemical analysis
702 27, 25033909, G01N 3100
Patent
active
060701285
ABSTRACT:
A method of determining or predicting a value P.sub.x of a property (e.g. octane number) of a material X or a property of a product of a process from the material or yield of the process for example a blending, separation, or chemical (e.g. polymerization) process, which method comprises measuring the absorption D.sub.ix of the material at more than one wavelength in the region 600-2600 nm, comparing the the signals indicative of the absorptions or a derivative thereof with signals indicative of absorptions D.sub.im or derivatives thereof at the same wavelength for a number of standards S in a bank for which the property or yield P is known, and choosing from the bank at least one standard S.sub.m with property P.sub.m the standard having the smallest average value of the absolute difference at each wavelength i between the signal for the material and the signal for the standard S.sub.m to obtain P.sub.x, with averaging of the properties or yields P.sub.m when more than one standard S.sub.m is chosen. If desired the method can be used as such to control the process by comparison of P.sub.m with the desired value and adjustment of the process to minimize deviations from P.sub.m ; in an alternative process the signal (or function thereof) of the standard(s) with the smallest average value of the absolute difference may be used directly to control the process.
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Bages Sylvie
Descales Bernard
Lambert Didier
Llinas Jean-Richard
Martens Andre
Bui Bryan
Eutech Engineering Solutions Limited
Hoff Marc S.
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