Patent ID: 6563585
Filing Date: 2003-05-13
Classification: G01N

Abstract:
An apparatus for measuring an analytic concentration of a sample comprising:a sample containing a dual wavelength-absorbing luminescent compound or a dual wavelength-emitting luminescent compound, a first light source producing a first light having a first wavelength to be directed at the sample to produce a first emission from the sample; a second light source producing a second light having a second wavelength to be directed at the sample to produce a second emission from the sample; a detector for detecting said first emission and said second emission emitted from the sample; a controller coupled to said first light source, said second light source and said detector for alternately switching between said first light source and said second light source so that only one light source is directing light at the sample; and an analyzer coupled to said controller, wherein said analyzer produces a duty ratio which is used to determine the analytic concentration of the sample.