A sensor arrangement for determining a concentration of a substance in an open sample in the presence of an interfering material is disclosed. The sensor arrangement comprises a first light source emitting pulsed light at a first wavelength being absorbed by said substance, a second light source emi
A sensor arrangement for determining a concentration of a substance in an open sample in the presence of an interfering material is disclosed. The sensor arrangement comprises a first light source emitting pulsed light at a first wavelength being absorbed by said substance, a second light source emitting pulsed light at a second wavelength being transmitted through said substance, optical means for directing at least a part of the emitted pulsed light of said first and second wavelengths through the open sample along the same optical path, and a sample detector arranged at an end of the optical path for receiving the emitted light of said first and second wavelengths being transmitted through the sample. The interfering material is formed as deposits on at least one of said optical means being exposed to said substance, and said first wavelength and said second wavelength are absorbed by said interfering material.
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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 man
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, anda 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. 2. The sensor arrangement of claim 1, wherein the first light source, the second light source, and the sample detector are arranged on one side of the sample. 3. The sensor arrangement of claim 2, wherein the at least one optical device includes a plurality of reflectors arranged on another side of the sample, the plurality of reflectors together being adapted to re-direct the emitted pulsed light of the first and second wavelengths to the sample detector. 4. The sensor arrangement of claim 3, wherein the plurality of reflectors are surfaces of a retroreflector prism in which reflection is achieved by total internal reflection. 5. The sensor arrangement according to claim 1, further comprising a reference detector configured to receive a part of the emitted pulsed light of the first and second wavelengths not being transmitted through the sample. 6. The sensor arrangement according to claim 5, wherein the reference detector is arranged on the same side of the sample as the first light source, the second light source, and the sample detector. 7. The sensor arrangement according to claim 6, wherein the first light source, the second light source, the sample detector, and the reference detector are enclosed in a housing sealed from the sample. 8. The sensor arrangement according to claim 7, wherein the housing comprises a first optical window configured to allow light emitted from the first light source and the second light source to exit the housing and enter the sample, and a second optical window configured to allow the light emitted from the first light source and the second light source to exit the sample and enter the housing, wherein the sensor arrangement further comprises a heater configured to increase a temperature of the first and second optical window. 9. The sensor arrangement according to claim 7, wherein the housing includes a cooler for reducing a temperature within the housing. 10. The sensor arrangement according to claim 5, further comprising a controller being connected to the first light source, the second light source, the sample detector, and the reference detector and being configured to activate the first light source and the second light source in the pulsed manner, the controller being further configured to associate a received signal of the sample detector and the reference detector with the associated light source. 11. The sensor arrangement according to claim 10, wherein the controller is further configured to associate the received signal of the sample detector and the reference detector as background light at occasions where none of the first light source and the second light source is activated. 12. The sensor arrangement according to claim 10, wherein the controller is configured to control a temperature of the first light source and the second light source, and to switch off the associated light source if the temperature exceeds a stored reference temperature. 13. The sensor arrangement according to claim 10, wherein the controller is connected to a memory storing reference values for the received detector signals, and wherein the controller is further configured to transmit an alarm signal if one of the received detector signals differs from the stored reference values. 14. The sensor arrangement according to claim 1, wherein the first light source is a UV-LED. 15. A filling machine capable of providing carton-based packages enclosing liquid food, comprising a sensor arrangement according to claim 1. 16. The filling machine according to clam 15, wherein the carton-based packages, prior to filling and subsequent sealing, are provided as open-ended bottles being transported through a sterilizing unit including a sterile gas manifold enclosing the sensor arrangement, and wherein the sterile gas manifold includes at least one sterile gas discharge spray nozzle being directed towards the open-ended bottle. 17. The filling machine according to claim 16, wherein the controller of the sensor arrangement is configured to provide the determined concentration of substance within the sample to a sterile substance supply. 18. A method for controlling a concentration of a substance in a sample, comprising: providing a sample being connected to a substance supply,determining the concentration of the substance within the sample in accordance with claim 16,comparing, via a controller associated with the sensor arrangement, the determined concentration with a reference value,determining, via the controller, a corrected operating parameter for the substance supply corresponding to the difference between the determined concentration and the reference value, andtransmitting, via the controller, the corrected operating parameter to the substance supply for increasing or decreasing the concentration of the substance within the sample. 19. A method for determining a concentration of a substance in a sample in the presence of an interfering material, via the sensor arrangement according to claim 1, the method comprising: activating the first light source and the second light source,receiving the emitted pulsed light of the first and second wavelengths being transmitted through the sample via the sample detector; anddetermining the concentration of the substance in the sample in the presence of the interfering material from at least one signal corresponding to the received emitted pulsed light.
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이 특허에 인용된 특허 (9)
Schwiesow Ronald L. (Boulder CO), Dual path ultraviolet hygrometer.
Abou-Saleh, Khaled; Fere, Patrick; Rousseau, Alain, Method and device for detecting variations of optical properties in a sample in and analysis process.
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