Sample e.g. research octane number 91 grade fuel pool, property estimating method for petrochemical field, involves determining sample property based on comparison result of calculated quotient and quotient relative to chemical compounds

摘要

The method involves measuring an optical density of a sample for different wavelengths of a wavelength range in a near infrared. A spectral quotient is determined from the measured density for different wavelengths and for the sample having chemical compounds. An extended spectral quotient is calculated for the sample on a part of the range from the determined quotient. The calculated extended spectral quotient is compared with an extended spectral quotient corresponding to the compounds and recorded in a database. A property of the sample is determined based on the comparison result. An independent claim is also included for an apparatus for estimating the property of a sample.