Patent ID: 7319523

Claim:
An optical sensor for measuring a concentration of a sample of interest, comprising: an optical housing having a sensing surface that forms the interface between said optical sensor and the sample of interest; a first temperature sensor and a second temperature sensor, said first temperature sensor arranged to measure the temperature of said optical housing and said second temperature sensor arranged to measure the temperature of said sample of interest; a photodetector array coupled to said optical housing; and a light source coupled to said optical housing and spatially arranged to emit light in the direction of said sensing surface, a portion of said light being internally reflected off said interface between said optical sensor and the sample of interest as a function of first and second temperatures measured by said first temperature sensor and said second temperature sensor, respectively, and the concentration of said sample of interest, said portion of said light being internally reflected to said photodetector array to determine the intensity thereof, wherein said intensity, and said first and second temperatures are utilized to calculate the concentration.