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A device for optical detection of a target gas in gas mixtures includes an operation and evaluation unit, a measurement cuvette with optically reflective surfaces on its interior walls and a gas inlet to the environment, a radiation source, a measuring detector and a reference detector unit provided

A device for optical detection of a target gas in gas mixtures includes an operation and evaluation unit, a measurement cuvette with optically reflective surfaces on its interior walls and a gas inlet to the environment, a radiation source, a measuring detector and a reference detector unit provided on the measurement cuvette. The measuring detector and the reference detector unit detect the light of the radiation source and produce electrical signals corresponding to the intensity of the detected light. An optical bandpass filter element, constructed to transmit light of a measurement wavelength, is arranged upstream of the measuring detector. An optical double-bandpass filter unit, that transmits light of a first reference wavelength and light of a second reference wavelength, is arranged upstream of the reference detector unit. The operation and evaluation unit operates the radiation source and acquires the electrical signals of the measurement detector and the reference detector unit.

대표청구항 ▼

1. A device for the optical detection of a target gas in gas mixtures, the device comprising: an operating and analyzing unit;a measuring cuvette comprising a multireflection measuring cuvette with optically reflecting surfaces on the inner walls and a gas inlet to exchange gases and gas mixtures wi

1. A device for the optical detection of a target gas in gas mixtures, the device comprising: an operating and analyzing unit;a measuring cuvette comprising a multireflection measuring cuvette with optically reflecting surfaces on the inner walls and a gas inlet to exchange gases and gas mixtures with a measurement environment;a radiation source, which emits light into the measuring cuvette;a measuring detector provided at the measuring cuvette;a reference detector unit provided at the measuring cuvette, wherein the measuring detector and the reference detector unit detect the light of the radiation source and produce electrical signals, which correspond to the intensity of the detected light;an optical band pass filter element, designed to transmit light of a measurement wavelength, arranged in front of the measuring detector; andan optical double band pass filter unit, designed to transmit light of a first reference wavelength and light of a second reference wavelength, arranged in front of the reference detector unit, wherein:the operating and analyzing operates the radiation source and receives the electrical signals of the measuring detector and of the reference detector unit;the operating and analyzing unit determines a target gas concentration with compensation of the effect of moisture present based on a determination of a moisture effect signal reduction in each of the signals belonging to the measurement wavelength and the first reference wavelength and the second reference wavelength. 2. A device in accordance with claim 1, wherein: the radiation source to emits light in the infrared wavelength range; andthe measurement wavelength, the first reference wavelength and the second reference wavelength are in the infrared optical wavelength range. 3. A device in accordance with claim 1, wherein the light emitted by the radiation source reaches the measuring detector and the reference detector unit after an at least one-time reflection at the reflecting surfaces of the measuring cuvette. 4. A device in accordance with claim 1, wherein: the reference detector unit is designed as a reference detector and;the optical double band pass filter unit is designed as a double band pass filter element, which transmits light of the first reference wavelength and light of the second reference wavelength. 5. A device in accordance with claim 1, wherein: the reference detector unit has a first reference detector and a second reference detector;the optical double band pass filter unit has a first reference wavelength filter element and a second reference wavelength filter element;the first reference wavelength filter element transmits light in the range of the first reference wavelength to the first reference detector; andthe second reference wavelength filter element transmits light in the range of the second reference wavelength to the second reference detector. 6. A device in accordance with claim 1, wherein at least one of the optical band pass filter element and the double band pass filter unit and the double band pass filter element and the first reference wavelength filter element and the second reference wavelength filter element are designed as an optical interference filter or a diffractive optical element. 7. A device in accordance with claim 1, further comprising: temperature sensors to detect temperatures of the wall of the measuring cuvette, of the measuring detector and of the reference detector unit. 8. A device in accordance with claim 1, further comprising: heating elements to temper the wall of at least one of the measuring cuvette, the measuring detector and the reference detector unit. 9. A device in accordance with claim 1, wherein the operating and analyzing unit is at least partly structurally separate from the measuring cuvette. 10. A device in accordance with claim 1, wherein the radiation source, the measuring detector and the reference detector unit are arranged on the same side in the measuring cuvette. 11. A device in accordance with claim 1, further comprising: a protective element, which is designed to prevent at least one of the transfer of contaminants from the measurement environment into the measuring cuvette and the transfer of quantities of energy from the measuring cuvette into the measurement environment, is arranged at the gas inlet towards the measurement environment. 12. A device in accordance with claim 1, wherein the device is arranged at least partly in a housing , wherein the housing has an explosion-proof design, so that no transfer of energy and no flashover of sparks from the housing into the measurement environment can take place. 13. A device in accordance with claim 1, wherein the measurement wavelength has a wavelength of 3,300 nm. 14. A device in accordance with claim 1, wherein the first reference wavelength has a wavelength of 3,100 nm. 15. A device in accordance with claim 1, wherein the second reference wavelength has a wavelength of 3,900 nm. 16. A device in accordance with claim 1, wherein the optical band pass filter element transmits light in the wavelength range of 3,200 nm to 3,500 nm to the measuring detector. 17. A device in accordance with claim 1, wherein the optical double band pass filter unit transmits light in the wavelength range of 3,000 nm to 3,200 nm and light in the wavelength range of 3,800 nm to 4,000 nm to the reference detector unit. 18. A device in accordance with claim 1, wherein the radiation source emits light in the infrared range of 2,000 nm to 5,000 nm. 19. A device in accordance with claim 1, wherein a filter element, which is designed to focus light emitted by the radiation source and/or to transmit light in a wavelength range of 3,000 nm to 4,000 nm, is arranged in front of the radiation source. 20. A device for the optical detection of a target gas in gas mixtures, the device comprising: an operating and analyzing unit;a measuring cuvette comprising a multireflection measuring cuvette with optically reflecting surfaces on the inner walls and a gas inlet to exchange gases and gas mixtures with a measurement environment;a radiation source, which emits light into the measuring cuvette;a measuring detector provided at the measuring cuvette;a reference detector unit provided at the measuring cuvette, wherein the measuring detector and the reference detector unit detect the light of the radiation source and produce electrical signals, which correspond to the intensity of the detected light;an optical band pass filter element, designed to transmit light of a measurement wavelength, arranged in front of the measuring detector; andan optical double band pass filter unit, designed to transmit light of a first reference wavelength and light of a second reference wavelength, arranged in front of the reference detector unit, wherein the operating and analyzing unit is designed to operate the radiation source and to detect the electric signals of the measuring detector and of the reference detector unit, wherein the operating and analyzing unit is designed to compensate the effect of the atmospheric humidity from the signal belonging to the first reference wavelength, from the signal belonging to the second reference wavelength and from the signal belonging to the measurement wavelength, including the spectral measuring sensitivity characteristic of the measuring detector and including the spectral measuring sensitivity characteristic of the reference detector unit and to determine a target gas concentration.