FETZNER Stephan,BRUNNER Raimund,ULMER Ulrich

A technology of absorption spectrum and infrared rays, applied in measurement devices, material analysis by optical means, instruments, etc., can solve problems such as measurement errors that cannot be completely eliminated

Active Publication Date: 2016-11-23
AVL EMISSION TEST SYST GMBH
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  • Description
  • Claims
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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

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  • FETZNER Stephan,BRUNNER Raimund,ULMER Ulrich
  • FETZNER Stephan,BRUNNER Raimund,ULMER Ulrich
  • FETZNER Stephan,BRUNNER Raimund,ULMER Ulrich

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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

Devices are known for determining the concentration of at least one gas in a sample gas flow by means of infrared absorption spectroscopy, said devices comprising an infrared radiation source (12) the radiation from which can be conducted into a chamber (20) of a gas cell (21), a sample gas flow which can be conducted into the chamber (20) and into the radiation, a detector (22) to which the radiation exiting from the chamber (20) can be conducted and by means of which detector the absorption spectrum of the exiting radiation can be determined, and a heat source (52), via which the sample gas flow is heated to a desired temperature. However, measurement inaccuracies often occur due to temperature gradients within the sample gas flow on the path through the optical measuring cell. In order to prevent these inaccuracies, the present application proposes that the heat source (52) is arranged within a thermal insulation (74) of the gas cell (21), wherein a sample gas channel (36) heated by the heat source (52) is arranged within the thermal insulation (74) upstream of an outlet (62) into the chamber (20).

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 Applications(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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