Device and method for spectroscopically measuring a gas concentration by determining a single absorption line

摘要

The invention relates to a device and a method for measuring a concentration of at least one component of a process gas by means of a laser (2a), the beam path of the laser (2a) penetrating a volume (1) containing the process gas. The invention is characterized by the fact that one section of the beam path penetrates the process gas in a free manner while another section thereof is shielded from the process gas. Only the section of the beam path, which penetrates the process gas in a free manner, is designated as the section to be measured (4) and is used for measuring the concentration by means of laser spectroscopy, exactly one absorption line being determined for said measurement.