Gas measurement system
AssigneeMettler-Toledo AG
InventorsFrancesca Venturini, Pär Bergström, Martin Hertel
Life of this patent
Estimating the term…
Abstract
A gas measurement system as disclosed can include a coherent light source, which emits a light beam; a detector; a beam path formed between the light source) and the detector; and a gas cell arranged in the beam path such that the detector receives light transmitted through the gas cell. The gas cell can include a porous ceramic and have an optical path length which is a multiple of the actual layer thickness of the gas cell. A optical element can be arranged in the beam path between the light source and the gas cell with the light beam emitted by the light being widened and unfocussed as the light beam enters the gas cell.
Claims20
A gas measurement system for absorption-spectroscopic determination of at least one chemical and/or physical parameter of a gaseous measuring medium, comprising:
- a coherent light source configured to emit a light beam;
- a detector;
- a beam path formed between the light source and the detector;
- a gas cell arranged in the beam path between the light source and the detector such that the detector will receive light transmitted through the gas cell;
- and
- an optical element arranged in the beam path between the light source and the gas cell;
- wherein the gas cell includes a porous ceramic;
- wherein the gas cell has an optical path length which is a multiple of an actual layer thickness of the gas cell;
- and
- wherein the optical element is configured:
- as an optically transparent window such that widening of a light beam will occur based on divergence of the light beam;
- or
- to include a diffuser or at least one diffractive optical element to deform a light beam;
- such that when a light beam is emitted by the light source it will be widened and unfocused when entering the gas cell.
Method for absorption-spectroscopic determination of content of one or more gases, the method comprising:
- emitting a light beam along a beam path between a light source and a detector, the beam path including a gas cell and an optical element, the gas cell having a porous ceramic and having an optical path length which is a multiple of an actual layer thickness of the gas cell;
- widening and unfocusing the light beam emitted by the light source before it enters the gas cell using an optical element arranged in the beam path between the light source and the gas cell;
- and
- determining content of one or more of the following gases using the detector:
- oxygen (O2), carbon dioxide (CO2), carbon monoxide (CO), nitrogen oxides (NOx), methane (CH4), amines, ammonia (NH3), hydrogen sulfides (H2S), sulfur oxides (SO2), hydrogen halides, HCI or HF, water and/or moisture (H2O), or mixtures thereof.
Dependencies are inferred from the claim text.