Patent ID: 8455844
Filing Date: 2013-06-04
Classification: G01J,G01N

Abstract:
1. A measurement system comprising: a plurality of stimulus light sources that provide stimulus light; a plurality of sensors each coupled to a light source of the light sources by a stimulus optical fiber, each sensor comprising an optode coupled to a photoluminescent chemosensor component for emitting fluorescent light at a fluorescent wavelength when illuminated by light at the stimulus wavelength, the emitted fluorescent light dependent upon an analyte concentration; sensing optical fibers coupling each sensor to at least one photodetector to quantify the emitted fluorescent light; wherein a first and second sensor of the plurality of sensors couple simultaneously to a photodetector of the at least one photodetector; apparatus for selectively energizing a first and second subset of the light sources and for analyzing the emitted fluorescent light as measured by the at least one photodetector; wherein the first sensor is coupled to a light source of the first subset of the light sources, and the second sensor is coupled to a light source of the second subset of the light sources; wherein the measurement system is adapted to provide readings of analyte concentration at the first and second sensor and distinguishes between the first and second sensor by separately energizing the subsets of light sources; and wherein the measurement system is configured to stimulate and read the first sensor prior to stimulating and reading the second sensor, and wherein the measurement system applies a correction to a reading of the second sensor for afterglow of the first sensor by subtracting from a reading of the second sensor at least a product of a constant multiplied by a reading of the first sensor.