公开(公告)号：US09995675B2

公开(公告)日：2018-06-12

申请号：US15112690

申请日：2015-01-22

Applicant: AVL EMISSION TEST SYSTEMS GMBH

Inventor： Stephan Fetzner ,  Raimund Brunner ,  Ulrich Ulmer

IPC: G01N21/03 ,  G01N21/3504 ,  G01N33/00 ,  G01N21/05

CPC classification number: G01N21/3504 ,  G01N21/031 ,  G01N21/0332 ,  G01N21/05 ,  G01N33/0016

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.