Non-dispersive gas analyzer

• US 9,030,666 B2
• Filed: 06/22/2011
• Issued: 05/12/2015
• Est. Priority Date: 06/25/2010
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Bitter, Ralf, Heffels, Camiel, Hrner, Thomas
• Primary Examiner(s): NGUYEN, SANG H
• Application Number:
  US13/805,225
• Publication Number:
  US 20130208280A1
• Time in Patent Office: 1,420 Days
• Field of Search: 356432-437, 356/246, 356/51, 250/344, 250/338.1, 250330-335, 25033901-33916, 250/340
• US Class Current: 356/437
• CPC Class Codes: G01N 2021/3155 Measuring in two spectral ranges, e.g. UV and visible
• CPC Class Codes: G01N 21/05 Flow-through cuvettes G01N21/09 takes precedence; handling fluid samples G01N1/10
• CPC Class Codes: G01N 21/274 Calibration, base line adjustment, drift correction
• CPC Class Codes: G01N 21/31 Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry G01N21/72 takes precedence
• CPC Class Codes: G01N 21/33 using ultraviolet light G01N21/39 takes precedence
• CPC Class Codes: G01N 21/3504 for analysing gases, e.g. multi-gas analysis
• CPC Class Codes: G01N 21/37 using pneumatic detection opto-acoustic detection G01N21/1702
• CPC Class Codes: G01N 21/61 Non-dispersive gas analysers G01N21/3504 takes precedence
• CPC Class Codes: G01N 2201/0696 Pulsed

Abstract

A non-dispersive gas analyzer comprising a light source, having light that shines through a measuring cuvette containing a measuring gas to be analyzed onto a non selective detector having a downstream evaluation unit, wherein a multi-component gas analysis is made possible using in a simple manner in that the light source is a flash discharge lamp and the evaluation unit is configured to evaluate the temporal pulse curves of the flash shining onto the detector such that it is possible to take advantage of the property of flash discharge lamps in that the emitted wavelength components vary over the duration of the flash.

Claims

1. A non-dispersive gas analyser comprising:

a light source comprising a flash discharge lamp;

a non-selective detector;

a measuring cuvette containing a measured gas to be analysed, light being incident through the measuring cuvette onto the non-selective detector; and

an analysis device connected downstream of the non-selective detector and configured to analyse a shape over time of each individual pulse of light flashes from the flash discharge lamp which is incident onto the non-selective detector;

wherein the analysis device is configured to analyse the time pulse curve for its frequency content, and wherein the analysis device is further configured to determine at least two different components of the measured gas by multivariate analysis of each individual pulse of the light flashes.

2. The non-dispersive gas analyser as claimed in claim 1, wherein the flash discharge lamp is a xenon flash lamp.

3. The non-dispersive gas analyser as claimed in claim 2, wherein the non-selective detector is a photodiode.

4. The non-dispersive gas analyser as claimed in claim 2, wherein the non-selective detector is a photocell.

5. The non-dispersive gas analyser as claimed in claim 2, wherein the non-selective detector is an optopneumatic receiver filled with a gas mixture of components to be measured.

6. The non-dispersive gas analyser as claimed in claim 1, wherein the non-selective detector is a photodiode.

7. The non-dispersive gas analyser as claimed in claim 1, wherein the non-selective detector is a photocell.

8. The non-dispersive gas analyser as claimed in claim 1, wherein the non-selective detector is an optopneumatic receiver filled with a gas mixture of components to be measured.

9. The non-dispersive gas analyser as claimed in claim 1, further comprising:

a reference cuvette filled with a reference or zero gas;

a further detector arranged downstream; and

a light distributor which portions the light emitted by the light source onto the measuring cuvette and the reference cuvette;

wherein the analysis device is further configured to analyse a differential pulse curve of the light flashes incident on the non-selective detector and the further detector.