G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 37/00 (2006.01) G01D 18/00 (2006.01) G01J 3/00 (2006.01) G01J 3/02 (2006.01) G01N 21/27 (2006.01) G01N 21/35 (2006.01)
Patent
CA 2146342
A calibrated spectrometer can indirectly determine a physical or chemical property of a sample based upon spectral re- sponses measured by the spectrometer with respect to the particular sample. This invention is directed to a method for calibrating or recalibrating a second spectrometer in light of a first spectrometer, or itself, respectively. The calibration employs a unique se- lection and manipulation of spectral data obtained from both the first and the second instrument. The recalibration employs a un- ique selection and manipulation of spectral data from the same first instrument, that is obtained both before and after the need for recalibration arises. Instead of modifiying the respective responses of the first and second instrument, or the first instrument before and after the need for calibration arises, this invention modifies the calibration equation of the second, or recalibrated in- strument, to yield consistent results to those obtained by the first instrument, or the first instrument before it goes out of calibra- tion. A calibration equation is an equation which transforms spectral data of a particular sample at a variety of wavelengths to a calculated value for a chemical or physical property. Generally, the form of such calibration equations is that of a linear combina- tion of absorbances or mathematical transforms of absorbances measured by the first and second instrument for each sample. Surprisingly, and confirmed statistically, the accuracy of the calibrated or recalibrated instrument is maintained and in some in- stances improved.
Ashland Oil Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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