IP Library › Granted Patent US 9,709,487
Granted Patent B2
US 9,709,487 · App. 14/601,729 · Granted Jul 18, 2017

Method for measuring the concentration of a gas component in a measuring gas

Inventors: Ralf Bitter (Karlsruhe, DE); Thomas Hankiewicz (Karlsruhe, DE); Christoph Wolfgang Marquardt (Karlsruhe, DE); Adrian Mucha (Karlsruhe, DE); Jan Nygren (Göteborg, SE); Kai-Uwe Pleban (Stutensee, DE); Franz Steinbacher (Karlsruhe, DE)
Assignee: Siemens Aktiengesellschaft
G01N21/39G01J3/433G01N33/0062G01N2021/399
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Quick Facts
Patent No.
US 9,709,487
App. No.
14/601,729
Granted
Jul 18, 2017
Kind
B2
Abstract

A method for measuring the concentration of a gas component in a measuring gas. An absorption line of the gas component is varied as a function of the wavelength of the light of a wavelength-tunable light source within a periodically sequential scanning interval. The absorption line of the gas component is modulated with a frequency (f 0 ). Modulated light is guided through the measuring gas onto a detector. A measurement signal generated by the detector is demodulated upon determining a harmonic (nf 0 ) of the frequency (f 0 ). A measurement result is produced by fitting a setpoint curve to the profile of the demodulated measurement signal. Both demodulated measurement signal and setpoint cure are filtered with the aid of the same filter function. The filter function is operative to suppress noise signal components of the demodulated measurement signal that disturb both signal components of the demodulated measurement signal and the setpoint curve.

Claims (8)

1. A method for measuring the concentration of a gas component in a measuring gas by a gas analyzer, the method comprising:

varying an absorption line of the gas component as a function of the wavelength of the light of a wavelength-tunable light source within a periodically sequential scanning interval;

modulating the absorption line of the gas component with a frequency (f 0 );

guiding the modulated light through the measuring gas onto a detector;

demodulating a measurement signal generated by the detector upon determining a harmonic (nf 0 ) of the frequency (f 0 ); and

producing a measurement result by fitting a setpoint curve to the profile of the demodulated measurement signal;

wherein both the demodulated measurement signal and the setpoint curve are filtered with the aid of the same filter function, the filter function being operative to suppress noise signal components of the demodulated measurement signal that disturb both signal components of the demodulated measurement signal and the setpoint curve.

2. The method of claim 1 , wherein the filter function of a highpass filter is used.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 3, 2015
From: BITTER, RALF; HANKIEWICZ, THOMAS; MARQUARDT, CHRISTOPH WOLFGANG; MUCHA, ADRIAN; NYGREN, JAN; PLEBAN, KAI-UWE; STEINBACHER, FRANZ
To: SIEMENS AKTIENGESELLSCHAFT
Reel/Frame 035327/0808 →
Priority Claims (1)
EP 14152041 · Jan 22, 2014 · regional
Continuity (1)
Related Publication 20150204779A1 · Jul 23, 2015