Patent ID: 9453796
Filing Date: 2016-09-27
CPC Classification: G01N

Claim Text:
1. A method of calibrating an optical system of a dry chemistry analyzer, the method comprising the steps of: causing at least one light emitting diode of the optical system to emit light, the light emitted by the at least one light emitting diode of the optical system of the dry chemistry analyzer having a wavelength band shape and centroid wavelength, the at least one light emitting diode being provided to illuminate a chemical reagent test slide, the reagent test slide having a reflection density spectrum associated therewith, the reagent test slide, when illuminated by the at least one light emitting diode, reflecting light, the optical system of the dry chemistry analyzer having a light detector, the light detector receiving light reflected from the reagent test slide illuminated by the light from the at least one light emitting diode, the light detector providing a signal in response to the reflected light received by the light detector; in an off-line test performed prior to the complete assembly of the dry chemistry analyzer, measuring the wavelength band shape and centroid wavelength of non-reflected light directly emitted by the at least one light emitting diode to provide a measured wavelength band shape and centroid wavelength; comparing the measured wavelength band shape and centroid wavelength with a reference wavelength band shape and centroid wavelength; and calculating one or more correction values, the one or more correction values providing a correction which is used to modify the reflection density determined from the signal provided by the light detector.