US 12,523,609 B2 · Distributed Raman H2 sensors

Abstract

A gas detection system includes a first optical fiber bundle connected to a first multi-pass cell for connecting the first multi-pass cell to a Raman spectrum analyzer. A second optical fiber bundle is connected to the first multi-pass cell for connecting the first multi-pass cell to a second multi-pass cell. The second optical fiber bundle can include a delay coil configured to provide temporal spacing between spectral returns from the first multi-pass cell and from the second multi-pass cell. The first and second multi-pass cells can be biconic multipass cells with a the first optical fiber bundle directed toward a first D-mirror, which is directed toward a T-mirror, which is directed toward a second D-mirror, which is directed toward the second optical fiber bundle. The D-mirrors can be on an opposite end of the first multi-pass cell from the T-mirror and the first and second optical fiber bundles.

Claims17

Dependent claims

A gas detection system comprising:

a first optical fiber bundle connected to a first multi-pass cell for connecting the first multi-pass cell to a Raman spectrum analyzer;
a second optical fiber bundle connected to the first multi-pass cell for connecting the first multi-pass cell to a second multi-pass cell;
a terminal optical fiber bundle operatively connecting the second multi-pass cell to a laser/LED amplitude monitor;
a 99:1 splitter connected to a central illumination fiber of the first optical fiber bundle;
an elastic backscatter monitor operatively connected to the 99:1 splitter;
and
a timing trigger photodiode operatively connected to the 99:1 splitter.

4 more elements

A gas detection system comprising:

a first optical fiber bundle connected to a first multi-pass cell for connecting the first multi-pass cell to a Raman spectrum analyzer;
a second optical fiber bundle connected to the first multi-pass cell for connecting the first multi-pass cell to a second multi-pass cell;
a terminal optical fiber bundle operatively connecting the second multi-pass cell to a first pulsed laser/LED illumination source to illuminate multi-path interiors of the multi-pass cells;
a first 99:1 splitter connected to a central illumination fiber of the terminal optical fiber bundle;
a first elastic backscatter monitor operatively connected to the first 99:1 splitter;
a first timing trigger photodiode operatively connected to the first 99:1 splitter;
a second 99:1 splitter connected to a central illumination fiber of the first optical fiber bundle;
a second elastic backscatter monitor operatively connected to the second 99:1 splitter;
and
a second timing trigger photodiode operatively connected to the second 99:1 splitter.

7 more elements

Dependencies are inferred from the claim text.

Distributed Raman H2 sensors

Life of this patent

Distributed Raman H2 sensors

Life of this patent

Abstract

Claims17