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Device for determining the concentration of at least one gas in a sample gas stream by means of infrared absorption spectroscopy

A technology that absorbs spectra and infrared rays, applied in measuring devices, material analysis through optical means, instruments, etc., can solve problems such as measurement errors that cannot be completely eliminated

Active Publication Date: 2019-08-06
AVL EMISSION TEST SYST GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this design helps to improve the measurement results, it has the problem that two different temperature sensors and temperature regulators are used, so the temperature gradient due to the temperature gradient occurring between the gas cell and the sample gas flow cannot be completely ruled out. Measurement error

Method used

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  • Device for determining the concentration of at least one gas in a sample gas stream by means of infrared absorption spectroscopy
  • Device for determining the concentration of at least one gas in a sample gas stream by means of infrared absorption spectroscopy
  • Device for determining the concentration of at least one gas in a sample gas stream by means of infrared absorption spectroscopy

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Embodiment Construction

[0029] In this embodiment, the device according to the invention for determining the concentration of at least one gas in the sample gas flow by means of infrared absorption spectroscopy is designed as a quantum cascade laser absorption spectrometer. The quantum cascade laser absorption spectrometer consists of a housing 10 in which a quantum cascade laser 12 composed of semiconductor layers is accommodated as a source of infrared radiation, which can be operated either continuously or pulsed and in particular Emits rays in the mid-infrared region. It is controlled by a current driver 14 and cooled by a Peltier element 16 .

[0030] The light of the laser 12 is guided into the chamber 20 of the gas chamber 21 via a plurality of mirrors 18 or otherwise directly to a detector 22 through the mirrors 18, which can be, for example, an MCT (Mercury-Tellurium-Cadmium) detector, which The detector is especially suitable for photodetection in the mid-infrared region and for the direct...

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Abstract

A device for determining a concentration of at least one gas in a sample gas flow by infrared absorption spectroscopy. The device includes a gas cell which includes a thermal insulation, a chamber, a heating source arranged within the thermal insulation which heats the sample gas flow to a desired temperature, and a sample gas duct having an outlet. The sample gas duct is heated by the heating source upstream of the outlet. An infrared radiation source emits a radiation which is conducted through the chamber of the gas cell. The sample gas flow is conducted into the chamber and into the radiation. A detector has the radiation exiting the chamber conducted thereto to determine an absorption spectrum.

Description

technical field [0001] The 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 radiation source, a sample gas flow, a detector and a heating source. a chamber of a chamber into which a sample gas flow can be introduced and the radiation, from which the radiation emerging from the chamber can be directed to the detector and by means of this detector the absorption spectrum of the emitted radiation is detected, The sample gas flow is heated to the rated temperature by the heating source. Background technique [0002] Infrared spectroscopy is well known for determining the concentration of individual gas components. A widely spread method is Fourier transform infrared spectroscopy or non-dispersive infrared spectroscopy. With the development of compact and high-power semiconductor lasers, gas analyzers based on laser spectroscopy have gradually been cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3504G01N21/03G01N21/05
CPCG01N21/031G01N21/0332G01N21/05G01N21/3504G01N33/0016
Inventor S.费茨纳R.布伦纳U.厄尔默
Owner AVL EMISSION TEST SYST GMBH
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