Abstract: In a method for measuring at least two different components of a fluid, the fluid is to a first measuring cell and a second measuring cell. In the first measuring cell, a first component of the fluid is excited by a first excitation to trigger a first light emission, and in the second measuring cell, a second component of the fluid is excited by a second excitation which is different from the first excitation, thereby triggering a second light emission. The first light emission and the second light emission are captured by an optical system facility and guided by the optical system facility in a direction of a detector facility which measures the first light emission and the second light emission.

Abstract: The gross or net calorific value of a hydrocarbon-containing fuel gas is determined by using a Raman photometer. A Raman radiation obtained following interaction of laser light with the fuel gas is limited by a bandpass filter to a wavenumber range of the C—H stretching vibrations of the hydrocarbons contained in the fuel gas around 2900 cm?1 and is supplied to a photomultiplier and integratively detected by the photomultiplier. The gross or net calorific value is determined from the output signal of the photomultiplier.

Abstract: A gas analyzer via which exhaust gas to be analyzed is conducted untreated through a first measurement chamber and, after treatment in an oxidation device, through a second measurement chamber, wherein ozone is produced from oxygen to thereby convert nitrogen monoxide into nitrogen dioxide, where the gas analyzer has a first light emitting diode and a second light emitting diode, light of both diodes is conducted through the first measurement chamber onto a first detector, light of the first light emitting diode is partly conducted through the second measurement chamber onto a second detector via a beam splitter arrangement, based on the first detector signal, the nitrogen dioxide concentration of the untreated gas is also measured, based on the second detector signal, the nitrogen dioxide concentration of the treated exhaust gas is measured, and the nitrogen oxide concentration of the exhaust gas is additionally determined from measured nitrogen dioxide concentrations.

Abstract: Gas analyzer and method for measuring nitrogen oxides in an exhaust gas, wherein to measure the nitrogen oxides, ozone is generated from oxygen, the exhaust gas is treated with the ozone generated to convert nitrogen monoxide within the exhaust gas into nitrogen dioxide, the nitrogen dioxide concentration in the treated exhaust gas is measured photometrically using a first light-emitting diode which emits with a central wavelength between 350 nm and 500 nm and output as the nitrogen oxide concentration in the exhaust gas, and the ozone concentration in the treated exhaust gas is measured photometrically using a second light-emitting diode which emits with a central wavelength between 250 nm and 265 nm, where generation of the ozone using the measured ozone concentration as an actual value is regulated to a prespecified setpoint value to enable reliable continuous measurement of nitrogen oxides in exhaust gases with a low outlay on equipment.

Abstract: A gas analyzer for measuring two gas components of a measuring gas includes two light-emitting diodes, a beam splitter, a measuring chamber through which the measuring gas circulates, a measurement detector, a reference detector, and a control and evaluation device for controlling the light-emitting diodes in an alternating manner and for evaluating the signals supplied by the measurement detector and the reference detector in terms of measuring results for the two gas components, wherein the beam splitter is arranged in a rectangular metal block, where the measuring chamber is formed as a long hollow body consisting of metal and open on both sides, the measurement detector is held on a detector block consisting of metal, and where the rectangular metal block and the detector block are interconnected via tension rods between which the measuring chamber is clamped.

Abstract: A gas analyzer via which exhaust gas to be analyzed is conducted untreated through a first measurement chamber and, after treatment in an oxidation device, through a second measurement chamber, wherein ozone is produced from oxygen to thereby convert nitrogen monoxide into nitrogen dioxide, where the gas analyzer has a first light emitting diode and a second light emitting diode, light of both diodes is conducted through the first measurement chamber onto a first detector, light of the first light emitting diode is partly conducted through the second measurement chamber onto a second detector via a beam splitter arrangement, based on the first detector signal, the nitrogen dioxide concentration of the untreated gas is also measured, based on the second detector signal, the nitrogen dioxide concentration of the treated exhaust gas is measured, and the nitrogen oxide concentration of the exhaust gas is additionally determined from measured nitrogen dioxide concentrations.

Abstract: A gas analyzer for measuring two gas components of a measuring gas includes two light-emitting diodes, a beam splitter, a measuring chamber through which the measuring gas circulates, a measurement detector, a reference detector, and a control and evaluation device for controlling the light-emitting diodes in an alternating manner and for evaluating the signals supplied by the measurement detector and the reference detector in terms of measuring results for the two gas components, wherein the beam splitter is arranged in a rectangular metal block, where the measuring chamber is formed as a long hollow body consisting of metal and open on both sides, the measurement detector is held on a detector block consisting of metal, and where the rectangular metal block and the detector block are interconnected via tension rods between which the measuring chamber is clamped.

Abstract: A gas analyzer includes an oxidation device and a subsequent photometer, wherein the oxidation device has a reaction chamber located in an exhaust gas path and a heating chamber downstream thereof, where an ultraviolet light source generates ozone from residual oxygen content of the exhaust gas within the reaction chamber to convert nitrogen monoxide into nitrogen dioxide in the exhaust gas, nitrogen oxides and excess ozone are broken down into nitrogen dioxide and oxygen in the heating chamber, the photometer outputs the measured nitrogen dioxide concentration as nitrogen oxide concentration of the untreated exhaust gas, and where an additional photometer is located in the exhaust gas path between the reaction chamber and the heating chamber which, via light absorption, measures the ozone concentration in the partially treated exhaust gas and outputs the same as oxygen concentration of the untreated exhaust gas.

Abstract: A gas analyzer includes an oxidation device and a subsequent photometer, wherein the oxidation device has a reaction chamber located in an exhaust gas path and a heating chamber downstream thereof, where an ultraviolet light source generates ozone from residual oxygen content of the exhaust gas within the reaction chamber to convert nitrogen monoxide into nitrogen dioxide in the exhaust gas, nitrogen oxides and excess ozone are broken down into nitrogen dioxide and oxygen in the heating chamber, the photometer outputs the measured nitrogen dioxide concentration as nitrogen oxide concentration of the untreated exhaust gas, and where an additional photometer is located in the exhaust gas path between the reaction chamber and the heating chamber which, via light absorption, measures the ozone concentration in the partially treated exhaust gas and outputs the same as oxygen concentration of the untreated exhaust gas.

Abstract: Gas analyzer and method for measuring nitrogen oxides in an exhaust gas, wherein to measure the nitrogen oxides, ozone is generated from oxygen, the exhaust gas is treated with the ozone generated to convert nitrogen monoxide within the exhaust gas into nitrogen dioxide, the nitrogen dioxide concentration in the treated exhaust gas is measured photometrically using a first light-emitting diode which emits with a central wavelength between 350 nm and 500 nm and output as the nitrogen oxide concentration in the exhaust gas, and the ozone concentration in the treated exhaust gas is measured photometrically using a second light-emitting diode which emits with a central wavelength between 250 nm and 265 nm, where generation of the ozone using the measured ozone concentration as an actual value is regulated to a prespecified setpoint value to enable reliable continuous measurement of nitrogen oxides in exhaust gases with a low outlay on equipment.

Abstract: A non-dispersive gas analyzer comprising a light source, having light that shines through a measuring cuvette containing a measuring gas to be analyzed onto a non selective detector having a downstream evaluation unit, wherein a multi-component gas analysis is made possible using in a simple manner in that the light source is a flash discharge lamp and the evaluation unit is configured to evaluate the temporal pulse curves of the flash shining onto the detector such that it is possible to take advantage of the property of flash discharge lamps in that the emitted wavelength components vary over the duration of the flash.

Abstract: A method and device for measuring the soot load in the exhaust gas systems of diesel engines using a sensor which is mounted downstream of a particulate filter and comprises a sensor element, to measure the operability of the particulate filter. According to the method, the soot load of the sensor element is measured resistively or capacitively using electrodes. The measuring voltage of the sensor element is controlled depending on at least one actual operating parameter of the diesel engine.

Abstract: A non-dispersive gas analyzer comprising a light source, having light that shines through a measuring cuvette containing a measuring gas to be analyzed onto a non selective detector having a downstream evaluation unit, wherein a multi-component gas analysis is made possible using in a simple manner in that the light source is a flash discharge lamp and the evaluation unit is configured to evaluate the temporal pulse curves of the flash shining onto the detector such that it is possible to take advantage of the property of flash discharge lamps in that the emitted wavelength components vary over the duration of the flash.

Abstract: A modulator wheel of a gas analyzer which contains an opening in the shadowing part thereof, where the opening generates in the measurement signal of the gas analyzer, in addition to a signal component at a modulation frequency generated by alternating shadowing and passing-through of the radiation, a further signal component having twice the modulation frequency that is used for detecting changes to the infrared radiation source or detector arrangement due to contamination, aging, or temperature, and compensating for the effects thereof on the measurement result.

Abstract: An on-line analyzer for analyzing a test sample, having a measuring device, which includes at least one measuring cell and at least one optoelectronic component. The measuring device determines, at at least one wavelength, the transmission or absorption of electromagnetic radiation passing through the test sample and provides measurement signals. The analyzer further includes a control/evaluation unit, which evaluates the measurement signals delivered by the measuring device and makes analysis data available. The measuring cell and the control/evaluation unit are located spatially separated from one another; the at least one optoelectronic component of the measuring device is assigned to the control/evaluation unit; the measuring cell and the at least one optoelectronic component are connected together via a light wave conductor.

Abstract: A measurement method in which, at the start of a measurement chain, a measured variable is picked up and is further-processed over the course of the measurement chain by conversion to generate a measurement result, where the original or converted measured variable is modulated at a predetermined modulation frequency at a first point in the measurement chain. At a second point in the measurement chain or sequence, which is after the first point in the direction of further-processing, a variable is added to the converted measured variable. The measurement chain or sequence is calibrated using different known values for the measured variable, where different vectors are obtained that define a characteristic, and an unknown value for the measured variable is determined from that point of the characteristic at which the vector obtained in the process or its extension intersects the characteristic.

Abstract: The invention relates to a NDIR two beam gas analyser in which infrared radiation is guided by modulation in an alternating manner through a measuring chamber and a reference chamber and is subsequently detected, a measurement signal being produced due to the analysis which determines the concentration of a measurement gas component present in the measurement chamber.

Abstract: A detector arrangement for detection of a measuring gas component in a gas mixture is provided. The arrangement includes a gas analyzer, a first single-layer receiver and a further single-layer receiver, the first single-layer receiver containing the measuring gas component and the further single-layer receiver containing a transverse gas. A concentration of the measuring gas component in the gas mixture is determined from signals delivered by sensors of the single-layer receivers. An evaluating device includes an n-dimensional calibration matrix for obtaining matrix signal values. Signal values of different known concentrations of the measuring gas component in the presence of different known transverse gas concentrations are stored as n-tubules in the evaluating device.

Abstract: A method and device for measuring the soot load in the exhaust gas systems of diesel engines using a sensor which is mounted downstream of a particulate filter and comprises a sensor element, to measure the operability of the particulate filter. According to the method, the soot load of the sensor element is measured resistively or capacitively using electrodes. The measuring voltage of the sensor element is controlled depending on at least one actual operating parameter of the diesel engine.

Abstract: The invention relates to a NDIR-gas analyser comprising an infrared radiation source (1), a measuring vessel (3) containing a gas mixture (4) having a measuring gas component (5) that is to be detected, and a detector device (7) that is arranged behind the measuring vessel that can detect the influence of ageing of the radiation source (1) and optionally dirt deposits in the optical radiation path without interrupting measuring. According to the invention, at least one optopneumatic detector (15) is arranged in the beam path of the radiation source (1), said detector being filled with any gas (16) when arranged between the radiation source (1) and the measuring vessel (3).