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Apparatus and method for determining the concentration of at least one gas in a sample gas stream

A sample gas and sample technology, applied in sampling devices, measuring devices, measuring fluid pressure, etc., can solve the problems of high propulsion gas consumption, high propulsion gas pressure, etc., and achieve the effect of favorable connection and simple connection

Active Publication Date: 2020-04-28
AVL EMISSION TEST SYST GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, this regulation has the disadvantage of a high propellant gas consumption, since it has to be fed against the resistance of the throttle valve in the feed line, so a high propellant gas pressure must always be present

Method used

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  • Apparatus and method for determining the concentration of at least one gas in a sample gas stream
  • Apparatus and method for determining the concentration of at least one gas in a sample gas stream

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Embodiment Construction

[0027] The device according to the present invention for determining the concentration of at least one gas in a sample gas stream by means of infrared absorption spectroscopy is designed as a quantum cascade laser absorption spectrometer (Quantenkaskaden Absorption Spectrometer) in this embodiment. It consists of a housing 10 in which a quantum cascade laser 12 composed of a semiconductor layer is arranged as an infrared radiation source. The quantum cascade laser operates either continuously or pulsed and emits radiation in the intermediate infrared range in particular . The quantum cascade laser 12 is controlled by a current exciter 14 and is cooled by means of a Peltier element not shown in the view.

[0028] The rays of the laser 12 are guided into the space 20 of the analysis chamber 16 through a plurality of lenses 18 or alternatively through the lenses 18 directly to a detector 22, such as an MCT (Quecksilber-Cadmium-Tellurid) detector, It is especially suitable for photo...

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Abstract

A device for determining the concentration of at least one gas in a sample gas flow by means of infrared absorption spectroscopy, having an infrared radiation source, the radiation of which is guided through an analysis chamber, the device having a sample gas flow, which is introduced into the analysis via a delivery tube The device has a detector and an ejector pump, which are arranged downstream of the analysis chamber and through which the measurement gas can be conveyed through the analysis chamber and the delivery tube. However, due to pressure fluctuations in the analysis chamber, measurement inaccuracies often occur or higher maintenance and production costs arise. In order to avoid this situation, a regulating valve is set in the propelling gas pipe leading to the propelling gas interface of the ejector pump, the pressure in the propelling gas pipe can be adjusted by the regulating valve, therefore, between the propelling gas pipe and the propelling gas pipe of the ejector pump The propulsion pressure in the propulsion nozzle is adjusted directly to the delivery pressure in the analysis chamber or delivery line.

Description

Technical field [0001] The present invention relates to a device for determining the concentration of at least one gas in a sample gas flow by means of infrared absorption spectroscopy. The device has an infrared ray source, the rays of which are guided through an analysis chamber, and the device has a sample gas The sample gas stream is introduced into and out of the analysis chamber through a conveying pipe. The device has a detector through which the absorption spectrum generated in the analysis chamber can be measured. The device has an ejector pump, the The ejector pump is arranged downstream of the analysis chamber and the measurement gas is guided through the analysis chamber and the transfer pipe by the ejector pump. The present invention also relates to a method for determining at least one of the sample gas flows by using infrared absorption spectroscopy by means of this device. The method of gas concentration, in which the rays of the infrared ray source are introduce...

Claims

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Application Information

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IPC IPC(8): G01N1/24G01N21/3504G01N21/05
CPCG01N2021/399G01N21/3504F04F5/50G01L19/0092G01N21/05G01N21/39
Inventor S.费茨纳
Owner AVL EMISSION TEST SYST GMBH
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