Detector Arrangement for a Nondispersive Infrared Gas Analyzer and Method for the Detection of a Measuring Gas Component in a Gas Mixture by Means of Such a Gas Analyzer

A detector arrangement for a non-dispersive infrared gas analyzer for detecting a measuring gas component in a gas mixture, comprising:

• a first single-layer receiver containing a measuring gas component or a gas spectrally overlaying the measuring gas component;
• a second single-layer receiver containing a transverse gas, a measuring gas component or a gas spectrally overlaying the measuring gas component;
• and
• an evaluating device for determining a concentration of the measuring gas component in the gas mixture from signals supplied from sensors of the first and second single-layer receivers,
• wherein the first and second single-layer receivers are located one behind the other in a beam path of the infrared gas analyzer,
• wherein the evaluating device includes a two-dimensional calibration matrix corresponding to a number of single-layer receivers,
• wherein signal values from the sensors obtained in the case of different known concentrations of the measuring gas component in the presence of different known transverse gas concentrations are stored in the evaluating device as two-tuples, and
• wherein the evaluating device is configured to determine the concentration of the measuring gas component when measuring unknown concentrations of the measuring gas component in the presence of unknown transverse gas concentrations by comparing the two-tuples of signal values obtained thereby with the two-tuples of signal values stored in the calibration matrix.

A method for detecting a measuring gas component in a gas mixture, comprising:

• providing a non-dispersive infrared gas analyzer;
• providing a detector arrangement comprising a first single-layer receiver and at least one additional single-layer receiver, the first single-layer receiver containing a measuring gas component or a gas spectrally overlaying the measuring gas component and the at least one additional single-layer receiver containing a transverse gas, the measuring gas component or a gas spectrally overlaying the measuring gas component;
• arranging the first and at least one additional single-layer receiver one behind the other in a beam path of the gas analyzer;
• using an n-dimensional calibration matrix corresponding to the number n of single-layer receivers;
• storing signal values from the sensors obtained in the case of different known concentrations of the measuring gas component in the presence of different known transverse gas concentrations in the n-dimensional calibration matrix as n-tuples;
• measuring unknown concentrations of the measuring gas component in the presence of unknown transverse gas concentrations and obtaining signal values and n-tuples thereof;
• and
• comparing the n-tuples of the unknown concentrations of the measuring gas component with the n-tuples of signal values stored in the calibration matrix.