In-situ gas-measuring system for gas reactors with critical environments

Patent metadata

Field	Value
Publication number	US-9915605-B2
Application number	US-201715462021-A
Country	US
Kind code	B2
Filing date	Mar 17, 2017
Priority date	Mar 18, 2016
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

An in-situ gas-measuring system ( 1 ) includes an IR photon source ( 10 ) and an IR photon detector ( 11 ). The in-situ gas-measuring system ( 1 ) has an expansion chamber ( 12 ), at which an optical element ( 16, 16′, 16″ ) is arranged. A connection element ( 13 ) provides a detachable fluid-communicating connection of the expansion chamber ( 12 ) to a gas reaction chamber ( 2 ). The IR-photon source ( 10 ), the optical element ( 16, 16′, 16″ ) and the IR photon detector ( 11 ) define an optical measuring path, which extends through the expansion chamber ( 12 ). The installation and maintenance of the in-situ gas-measuring system ( 1 ) are reduced by the features of the in-situ gas-measuring system ( 1 ).

First claim

What is claimed is:

1. A gas-measuring system comprising:
an IR photon source;
an IR photon detector;
an expansion chamber having an interior gas space;
an optical element arrangement operatively connected with the expansion chamber and defining an optical measuring path which extends through the expansion chamber;
a photon source waveguide connected to the optical element arrangement and operatively connecting the IR photon source to the interior gas space of the expansion chamber, wherein the photon source waveguide comprises a section of the optical measuring path and the IR photon detector is positioned outside of the interior gas space of the expansion chamber and arranged at a distance from the expansion chamber away from the expansion chamber;
a photon detector waveguide connected to the optical element arrangement and operatively connecting the IR photon detector to the interior gas space of the expansion chamber wherein the photon detector waveguide comprises a section of the optical measuring path and the IR photon detector is positioned outside of the interior gas space of the expansion chamber and arranged at a distance from the expansion chamber from the expansion chamber; and
a connection element detachably and fluid-communicatingly connecting the expansion chamber to a gas reaction chamber, whereby gas in the reaction chamber flows into the interior gas space of the expansion chamber and gas pressure in the interior gas space of the expansion chamber is equalized with gas pressure in the gas reaction chamber, wherein the IR photon source, the optical element and the IR photon detector define an optical measuring path, which extends through the expansion chamber.

2. A gas-measuring system in accordance with claim 1 , wherein the waveguide is a sapphire waveguide.

3. A gas-measuring system in accordance with claim 1 , wherein the optical element arrangement comprises first and second optical elements that are each arranged in the interior space of the expansion chamber.

4. A gas-measuring system in accordance with claim 1 , wherein the optical element arrangement comprises first and second optical elements that are each arranged in a wall of the expansion chamber.

5. A gas-measuring system in accordance with claim 1 , wherein the optical element arrangement comprises an optical element that is arranged at an end of each waveguide.

6. A gas-measuring system in accordance with claim 1 , wherein the optical element arrangement comprises a convergent lens or a concave mirror or a collimator lens or any combination of a convergent lens, a concave mirror and a collimator lens.

7. A gas-measuring system in accordance with claim 1 , further comprising a closing element configured to block the fluid-communicating connection between the expansion chamber and a gas reaction chamber.

8. A gas-measuring system in accordance with claim 7 , wherein the closing element is integrated into the connection element.

9. A gas-measuring system in accordance with claim 7 , wherein the expansion chamber and the connection element are configured separately, wherein the closing element is integrated into the connection element.

10. A gas-measuring system in accordance with claim 1 , wherein the expansion chamber has an expansion chamber closing element.

11. A gas-measuring system in accordance with claim 7 , wherein the expansion chamber has an expansion chamber closing element containing expansion chamber gas within the expansion chamber such that expansion chamber gas remains in the expansion chamber upon detachably disconnecting the connection element from the gas reaction chamber to isolate the expansion chamber from the gas reaction chamber and from an environment.

12. A gas-measuring system in accordance with claim 1 , further comprising a closing element configured to block the fluid-communicating connection between the expansion chamber and a gas reaction chamber and configured to contain expansion chamber gas within the expansion chamber such that expansion chamber gas that had entered from the gas reaction chamber remains in the expansion chamber upon detachably disconnecting the connection element from the gas reaction chamber to isolate the expansion chamber from the gas reaction chamber and from an expansion chamber environment.

13. A gas-measuring system in accordance with claim 1 , wherein:
the optical element arrangement comprises a first optical element arranged in a wall of the expansion chamber and a second optical element arranged in a wall of the expansion chamber;
the first optical element is arranged at an end of the photon source waveguide and the second optical element is arranged at an end of the photon detector waveguide; and
the first and second optical elements comprise a convergent lens or a concave mirror or a collimator lens or any combination of a convergent lens, a concave mirror and a collimator lens.

Assignees

• Draeger Safety Ag & Co Kgaa

Inventors

• Schmidt-Kaeding Patrick

Classifications

• G01N2201/0227

  Sealable enclosure · CPC title

• G01N2021/0314

  Double pass, autocollimated path · CPC title

• G01N2201/086

  Modular construction, e.g. disconnectable fibre parts · CPC title

• G01N21/09

  adapted to resist hostile environments or corrosive or abrasive materials · CPC title

• G01N21/3504 Primary

  for analysing gases, e.g. multi-gas analysis · CPC title