Patent ID: 9625383
Date: 2017-04-18
CPC Classifications: B65B,G01N

Claim:
1. A sensor arrangement for determining a concentration of a substance in a sample in the presence of an interfering material, comprising: a first light source emitting light in a pulsed manner at a first wavelength to be absorbed by the substance, a second light source emitting light in a pulsed manner at a second wavelength to be transmitted through the substance, at least one optical device configured to direct, at least a part of the emitted pulsed light of the first wavelength and at least a part of the emitted pulsed light of the second wavelength, through the sample along the same optical path in a sequential order, and a sample detector arranged in the optical path in order to receive the emitted pulsed light of the first and second wavelengths transmitted through the sample, wherein the sample detector is configured to detect the emitted pulsed light of the first wavelength during a first period of time and detect the emitted pulsed light of the second wavelength during a second period of time following the first period of time, wherein the interfering material is formed as deposits on one or more of the at least one optical device that is exposed to the substance, and wherein the first wavelength and the second wavelength are absorbed by the interfering material.