Spectroscopic sensor device and method for operating a spectroscopic sensor device
A spectroscopic sensor device comprising an absorption path for receiving at least one fluid medium that is to be analyzed, an infrared radiation source for sending out infrared radiation into the absorption path, an infrared sensor array that has a multiplicity of pixels that can be individually evaluated, which are fashioned to detect the infrared radiation propagated from the infrared radiation source through the fluid medium as individual pixel measurement signals, and comprising an evaluation device that is fashioned to combine a multiplicity of pixel measurement signals of the pixels and to output them via an individual measurement channel. Furthermore, a method for operating a spectroscopic sensor device is also described.
1. A spectroscopic sensor device, comprising:
an absorption path for receiving at least one fluid medium that is to be analyzed;
an infrared radiation source for sending out infrared radiation into the absorption path;
an infrared sensor array that has a multiplicity of pixels that can be individually evaluated, which are fashioned to detect the infrared radiation propagated from the infrared radiation source through the fluid medium as individual pixel measurement signals, the pixels of one or more pixel regions of the infrared sensor array being provided at least partly with a respective optical filter for the wavelength-selective transmission of the infrared radiation; and
an evaluation device that is fashioned to combine a multiplicity of pixel measurement signals of the pixels and to output them via an individual measurement channel, the evaluation device being fashioned to determine the position of the optical filter or filters.
2. The spectroscopic sensor device as recited in claim 1 , wherein at least two pixels of the infrared sensor array are fashioned to detect a first gas, and being provided with a first optical filter for the wavelength-selective transmission of the infrared radiation.
3. The spectroscopic sensor device as recited in claim 2 , wherein at least two pixels of the infrared sensor array are fashioned to detect a second gas, and being provided with a second optical filter for the wavelength-selective transmission of the infrared radiation.
4. The spectroscopic sensor device as recited in claim 1 , wherein at least one pixel of the infrared sensor array is fashioned as a monitoring and compensation pixel.
5. The spectroscopic sensor device as recited in claim 1 , wherein the evaluation device is fashioned to not take into account pixel measurement signals of pixels in one or more pixel regions of the infrared sensor array on the basis of at least one specified criterion during the combining of the pixel measurement signals.
6. The spectroscopic sensor device as recited in claim 5 , wherein the specified criterion being that a deviation of the pixel measurement signal from a mean value of the pixel measurement signals is greater than a prespecified amount.
7. The spectroscopic sensor device as recited in claim 1 , wherein the evaluation device is fashioned in one piece with the infrared sensor array.
8. The spectroscopic sensor device as recited in claim 1 , wherein the evaluation device is fashioned to modify the gain or the offset of the individual pixels.
9. A method for operating a spectroscopic sensor device, the spectroscopic sensor including an absorption path for receiving at least one fluid medium that is to be analyzed, an infrared radiation source for sending out infrared radiation into the absorption path, an infrared sensor array that has a multiplicity of pixels that can be individually evaluated, which are fashioned to detect the infrared radiation propagated from the infrared radiation source through the fluid medium as individual pixel measurement signals, the pixels of one or more pixel regions of the infrared sensor array being provided at least partly with a respective optical filter for the wavelength-selective transmission of the infrared radiation, and an evaluation device that is fashioned to combine a multiplicity of pixel measurement signals of the pixels and to output them via an individual measurement channel, the evaluation device being fashioned to determine the position of the optical filter or filters, the method comprising:
measuring the pixel measurement signals of the pixels in one or more pixel regions having in each case a multiplicity of pixels of the infrared sensor array;
analyzing the pixel measurement signals on the basis of at least one specified criterion;
determining a position of the optical filter or filters by the evaluation device; and
combining the pixel measurement signals of the individual pixels in a respective region, taking into account the result of the analysis.