Patent ID: 8189196
Filing Date: 2012-05-29
Classification: C07D,G01N

Abstract:
1. A method for spectroscopically analyzing a sample in a cell comprising: (a) sequentially energizing a plurality of LEDs of different selectable wavelengths; (b) directly coupling each of said plurality of LEDs to an optical fiber; (c) forming said optical fibers into a single bundle; (d) coupling said bundle to a large core fiber acting as a multimode mixing element and having an output; (e) generating a generally even power distribution at the mixing element output; (f) simultaneously coupling light from said mixing element output to a reference detector and to a plurality of sample fiber optic output ports via a secondary fiber optic bundle; (g) coupling light from said output ports to the input of a sample cell via a third plurality of optical fibers; (h) coupling light from the output of the sample to individual detector elements via a fourth plurality of optical fibers; (i) analyzing the spectroscopic change of each sample placed in the individual sample cell simultaneously by the detector elements for each wavelength; (j) correcting LED drift or noise by comparison with said reference detector; and (k) performing multiple wavelength analyses with the sequentially energized LEDs.