Process for operating an optical gas measuring system for determining the concentration of measuring gas, which has a line spectrum, optical gas measuring system and computer program product

An optical gas measuring system for determining the concentration of measuring gas, which has a line spectrum, by radiation absorption, the optical gas measuring system comprising:

• a first radiation detector, which is configured to indicate a first radiation intensity at a first measuring wavelength or at a first measuring wavelength range;
• a second radiation detector, which is configured to indicate a second radiation intensity at a second measurement wavelength or at a second measurement wavelength range;
• and
• an evaluation unit which is configured to
• receive a first measurement signal from the first radiation detector, which indicates the first radiation intensity at the first measurement wavelength or at the first measurement wavelength range;
• receive a second measurement signal from the second radiation detector, which indicates the second radiation intensity at the second measurement wavelength or at the second measurement wavelength range, wherein the first measuring wavelength or the first measuring wavelength range is different from the second measuring wavelength or from the second measuring wavelength range;
• calculate a determination value, which indicates a quotient of the received first measurement signal and the received second measurement signal;
• receive comparison information, which indicates a plurality of possible quotients of the first measurement signal and the second measurement signal for a corresponding plurality of possible ambient pressures;
• compare the determination value with the comparison information to determine a quotient of the plurality of possible quotients which has the highest agreement with the determination value;
• determine which ambient pressure of the plurality of possible ambient pressures the quotient of the plurality of possible quotients corresponds to obtain an estimated ambient pressure;
• and
• provide the estimated ambient pressure.

A computer program product with a computer readable storage medium that is a tangible device comprising non-transitory instructions that cause an optical gas measurement system to perform one or more of the process steps comprising:

• a) receiving a first measurement signal, which indicates a first radiation intensity at a first measurement wavelength or at a first measurement wavelength range;
• b) receiving a second measurement signal, which indicates a second radiation intensity at a second measurement wavelength or at a second measurement wavelength range, wherein the first measuring wavelength or the first measuring wavelength range is different from the second measuring wavelength or from the second measuring wavelength range;
• c) calculating a determination value, which indicates a quotient of the received first measurement signal and the received second measurement signal,
• d) receiving comparison information, which indicates a plurality of possible quotients of the first measurement signal and the second measurement signal for a corresponding plurality of possible ambient pressures;
• e) comparing the determination value with the comparison information to determine a quotient of the plurality of possible quotients which has the highest agreement with the determination value;
• f) determining which ambient pressure of the plurality of possible ambient pressures the quotient of the plurality of possible quotients corresponds to obtain an estimated ambient pressure;
• and
• g) providing the estimated ambient pressure,
• wherein the optical gas measurement system comprises:
• a first radiation detector, which is configured to indicate the first radiation intensity at the first measuring wavelength or at the first measuring wavelength range;
• a second radiation detector, which is configured to indicate the second radiation intensity at the second measurement wavelength or at the second measurement wavelength range;
• and
• an evaluation unit configured to execute the instructions.