CA2386268A1 - Vehicle mounted gas detector - Google Patents
Vehicle mounted gas detector Download PDFInfo
- Publication number
- CA2386268A1 CA2386268A1 CA002386268A CA2386268A CA2386268A1 CA 2386268 A1 CA2386268 A1 CA 2386268A1 CA 002386268 A CA002386268 A CA 002386268A CA 2386268 A CA2386268 A CA 2386268A CA 2386268 A1 CA2386268 A1 CA 2386268A1
- Authority
- CA
- Canada
- Prior art keywords
- photo
- detector
- light
- absorption cell
- vehicle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010521 absorption reaction Methods 0.000 claims abstract 24
- 238000000034 method Methods 0.000 claims 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims 4
- 230000031700 light absorption Effects 0.000 claims 3
- 239000002360 explosive Substances 0.000 claims 2
- 239000000356 contaminant Substances 0.000 claims 1
- 230000001681 protective effect Effects 0.000 claims 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
Abstract
A mobile gas detector comprising a laser transmitter and signal analyser carried on a vehicle, the vehicle having an exterior, a laser absorption cell carried on the exterior of the vehicle, a light guide connecting light from the laser transmitter into the laser absorption cell, a photo-detector mounted with the laser absorption cell exterior to the vehicle to convert light that has traversed the laser absorption cell into electrical signals, and a cable connecting the photo- detector to the signal analyser.
Claims (20)
1. A mobile gas detector, comprising:
a laser transmitter and signal analyser carried on a vehicle, the vehicle having an exterior;
a laser absorption cell carried on the exterior of the vehicle;
a light guide connecting light from the laser transmitter into the laser absorption cell;
a photo-detector mounted with the laser absorption cell exterior to the vehicle to convert light that has traversed the laser absorption cell into electrical signals;
and a cable connecting the photo-detector to the signal analyser.
a laser transmitter and signal analyser carried on a vehicle, the vehicle having an exterior;
a laser absorption cell carried on the exterior of the vehicle;
a light guide connecting light from the laser transmitter into the laser absorption cell;
a photo-detector mounted with the laser absorption cell exterior to the vehicle to convert light that has traversed the laser absorption cell into electrical signals;
and a cable connecting the photo-detector to the signal analyser.
2. The mobile gas detector of claim 1 in which the laser absorption cell comprises:
a frame attached to the exterior of the vehicle, the frame having a passageway passing through the frame; and a retro-reflector oriented to reflect light that has entered the light absorption cell from the light guide towards the photo-detector.
a frame attached to the exterior of the vehicle, the frame having a passageway passing through the frame; and a retro-reflector oriented to reflect light that has entered the light absorption cell from the light guide towards the photo-detector.
3. The mobile gas detector of claim 2 in which a mirror is mounted on the frame to reflect light from the light guide across the light absorption cell in at least two back and forth passes before the light reaches the photo-detector.
4. The mobile gas detector of claim 2 further comprising a protective window mounted on the frame over the retro-reflector to protect the retro-reflector from airborne contaminants.
5. The mobile gas detector of claim 1 in which the vehicle is a helicopter.
6. The mobile gas detector of claim 1 in which the laser transmitter transmits light in the 1650 nm absorption band of methane.
7. The mobile gas detector of claim 1 in which the photo-detector is operated in an electrically safe manner for explosive operating conditions.
8. The mobile gas detector of claim 1 in which the photo-detector is a photo-diode configured to operate in photo-voltaic mode.
9. The mobile gas detector of claim 1 in which the light guide and photo-detector are mounted on one side of the laser absorption cell, a mirror is mounted on an opposed side and the light guide is oriented to direct light across the laser absorption cell, reflect off the mirror, onto the photo-detector.
10. The mobile gas detector of claim 9 further comprising an offset parabolic mirror mounted on the frame to collect light that has traversed the laser absorption cell and direct the light onto the photo-detector.
11. A method of detecting a target gas, the method comprising the steps of:
traversing a target area with a vehicle having an exterior;
passing air through a laser absorption cell carried on the exterior of the vehicle;
directing light through the laser absorption cell;
converting light that has made at least one pass through the laser absorption cell into electrical signals using a photo-detector mounted with the laser absorption cell exterior to the vehicle; and analysing the electrical signals for a signal indicative of the presence of the target gas.
traversing a target area with a vehicle having an exterior;
passing air through a laser absorption cell carried on the exterior of the vehicle;
directing light through the laser absorption cell;
converting light that has made at least one pass through the laser absorption cell into electrical signals using a photo-detector mounted with the laser absorption cell exterior to the vehicle; and analysing the electrical signals for a signal indicative of the presence of the target gas.
12. The method of claim 11 in which the step of analysing the light is carried out in a signal analyser carried inside the vehicle.
13. The method of claim 11 in which the laser absorption cell is carried on an aircraft.
14. The method of claim 11 in which the light directed through the laser absorption cell is in the 1650 nm absorption band of methane.
15. The method of claim 11 in which the photo-detector operates in an electrically safe manner for an explosive operating environment.
16. The method of claim 11 in which the photo-detector is a photo-diode operating in photo-voltaic mode.
17. A mobile gas detector, comprising:
a laser transmitter and signal analyser carried on a vehicle, the vehicle having an exterior;
a laser absorption cell carried on the exterior of the vehicle, the laser absorption cell having a frame attached to the exterior of the vehicle, the frame having a passageway passing through the frame;
a light guide connecting light from the laser transmitter into the laser absorption cell;
a photo-detector mounted on the vehicle to convert light that has traversed the laser absorption cell into electrical signals;
a cable connecting the photo-detector to the signal analyser; and a retro-reflector oriented on the frame to reflect light that has entered the light absorption cell from the light guide towards the photo-detector.
a laser transmitter and signal analyser carried on a vehicle, the vehicle having an exterior;
a laser absorption cell carried on the exterior of the vehicle, the laser absorption cell having a frame attached to the exterior of the vehicle, the frame having a passageway passing through the frame;
a light guide connecting light from the laser transmitter into the laser absorption cell;
a photo-detector mounted on the vehicle to convert light that has traversed the laser absorption cell into electrical signals;
a cable connecting the photo-detector to the signal analyser; and a retro-reflector oriented on the frame to reflect light that has entered the light absorption cell from the light guide towards the photo-detector.
18. The mobile gas detector of claim 17 in which the retro-reflector is mounted on a side of the passageway opposed to the photo-detector.
19. The mobile gas detector of claim 17 in which the retro-reflector and the photo-diode are on the same side of the passageway.
20. The mobile gas detector of claim 17 in which the photo-detector is a photo-diode operating in photo-voltaic mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2386268A CA2386268C (en) | 2002-05-13 | 2002-05-13 | Vehicle mounted gas detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2386268A CA2386268C (en) | 2002-05-13 | 2002-05-13 | Vehicle mounted gas detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2386268A1 true CA2386268A1 (en) | 2003-11-13 |
| CA2386268C CA2386268C (en) | 2012-02-14 |
Family
ID=29425942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2386268A Expired - Lifetime CA2386268C (en) | 2002-05-13 | 2002-05-13 | Vehicle mounted gas detector |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2386268C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016029305A1 (en) * | 2014-08-25 | 2016-03-03 | Isis Geomatics Inc. | Apparatus and method for detecting a gas using an unmanned aerial vehicle |
| CN108693121A (en) * | 2017-12-15 | 2018-10-23 | 上海磐波智能科技有限公司 | water quality transparency detection device |
| CN112304898A (en) * | 2020-10-23 | 2021-02-02 | 西安智光物联科技有限公司 | Vehicle-mounted front-mounted laser gas detector |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10458904B2 (en) | 2015-09-28 | 2019-10-29 | Ball Aerospace & Technologies Corp. | Differential absorption lidar |
| US10921245B2 (en) | 2018-06-08 | 2021-02-16 | Ball Aerospace & Technologies Corp. | Method and systems for remote emission detection and rate determination |
-
2002
- 2002-05-13 CA CA2386268A patent/CA2386268C/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016029305A1 (en) * | 2014-08-25 | 2016-03-03 | Isis Geomatics Inc. | Apparatus and method for detecting a gas using an unmanned aerial vehicle |
| EP3186605A4 (en) * | 2014-08-25 | 2018-06-13 | Isis Geomatics Inc. | Apparatus and method for detecting a gas using an unmanned aerial vehicle |
| US10094773B2 (en) | 2014-08-25 | 2018-10-09 | Isis Geomatics Inc. | Apparatus and method for detecting a gas using an unmanned aerial vehicle |
| CN108693121A (en) * | 2017-12-15 | 2018-10-23 | 上海磐波智能科技有限公司 | water quality transparency detection device |
| CN112304898A (en) * | 2020-10-23 | 2021-02-02 | 西安智光物联科技有限公司 | Vehicle-mounted front-mounted laser gas detector |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2386268C (en) | 2012-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20220513 |