Method for operating an optical measuring system for measuring the concentration of a gas component in a measured gas

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 IDC and a modulation current IAC and a lase...

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Bibliographische Detailangaben
Hauptverfasser:	Platz, Torsten, Wittmann, Andreas, Schlesinger, Sven
Format:	Patent
Sprache:	eng
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
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Beschreibung
Zusammenfassung:	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 IDC and a modulation current IAC and a laser beam of the wavelength λ0 having a wavelength modulation amplitude ΔλAC is emitted, and the wavelength modulation amplitude ΔλAC of the laser light is kept constant by way of variable setting of the current modulation amplitude ΔIAC. The method provides for keeping a modulated power ΔPAC at an internal resistor RI of the laser light source constant at the operating point so as to stabilize the wavelength modulation amplitude ΔλAC.