Axetris Ag

Torsten Platz

Andreas Wittmann

Sven Schlesinger

A method for operating an optical measuring system including a wavelength-tunable temperature-stabilized laser light source for measuring the concentration of a target gas in a measured gas, wherein an instantaneous base current Icorresponding to a wavelength &#x3bb;of a target gas absorption line is set so that a wavelength distance &#x394;&#x3bb;defined during calibration between a target gas absorption line for a target gas and a reference gas absorption line for a reference gas is maintained. During operation, a temperature difference in the laser light source, defined in advance during calibration, between the operating points selected at the time of calibration of the reference gas, with a base current I, and the target gas, with a base current I, is maintained by determining the required instantaneous base current Ifor the target gas, as a function of an instantaneous base current Ifor the reference gas.

Method and system for the relative referencing of a target gas in an optical measuring system for laser spectroscopy

A method for operating an optical measuring system for measuring the concentration of a gas component in a measured gas, based on wavelength modulation spectroscopy, wherein a laser light source is operated in a current-modulated manner with a base current Iand a modulation current Iand a laser beam of the wavelength &#x3bb;having a wavelength modulation amplitude &#x394;&#x3bb;is emitted, and the wavelength modulation amplitude &#x394;&#x3bb;of the laser light is kept constant by way of variable setting of the current modulation amplitude &#x394;I. The method provides for keeping a modulated power &#x394;Pat an internal resistor Rof the laser light source constant at the operating point so as to stabilize the wavelength modulation amplitude &#x394;&#x3bb;.

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Weggis, Switzerland

Torsten Platz