Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Infrared_open-path_detector> ?p ?o }
- Infrared_open-path_detector abstract "Infrared open-path gas detectors send out a beam of infrared light, detecting gas anywhere along the path of the beam. This linear 'sensor' is typically a few metres up to a few hundred metres in length. Open-path detectors can be contrasted with Infrared point sensors.They are widely used in the petroleum and petrochemical industries, mostly to achieve very rapid gas leak detection for flammable gases at concentrations comparable to the lower flammable limit (typically a few percent by volume). They are also used, but so far to a lesser extent, in other industries where flammable concentrations can occur, such as in coal mining and water treatment. In principle the technique can also be used to detect toxic gases, for instance hydrogen sulfide, at the necessary parts-per-million concentrations, but the technical difficulties involved have so far prevented widespread adoption for toxic gases.Usually, there are separate transmitter and receiver units at either end of a straight beam path. Alternatively, the source and receiver are combined, and the beam bounced off a retroreflector at the far end of the measurement path. For portable use, detectors have also been made which use the natural albedo of surrounding objects in place of the retroreflector. The presence of a chosen gas (or class of gases) is detected from its absorption of a suitable infrared wavelength in the beam. Rain, fog etc. in the measurement path can also reduce the strength of the received signal, so it is usual to make a simultaneous measurement at one or more reference wavelengths. The quantity of gas intercepted by the beam is then inferred from the ratio of the signal losses at the measurement and reference wavelengths. The calculation is typically carried out by a microprocessor which also carries out various checks to validate the measurement and prevent false alarms.The measured quantity is the sum of all the gas along the path of the beam, sometimes termed the path-integral concentration of the gas. Thus the measurement has a natural bias (desirable in many applications) towards the total size of an unintentional gas release, rather than the concentration of the gas that has reached any particular point. Whereas the natural units of measurement for an Infrared point sensor are parts-per-million (ppm) or the percentage of the lower flammable limit (%LFL), the natural units of measurement for an open path detector are ppm.metres (ppmm) or LFL.metres (LFLm). For instance, the fire and gas safety system on an offshore platform in the North Sea typically has detectors set to a full-scale reading of 5LFLm, with low and high alarms triggered at 1LFLm and 3LFLm respectively.".
- Infrared_open-path_detector wikiPageExternalLink fgdetect.htm.
- Infrared_open-path_detector wikiPageID "28500068".
- Infrared_open-path_detector wikiPageLength "12439".
- Infrared_open-path_detector wikiPageOutDegree "81".
- Infrared_open-path_detector wikiPageRevisionID "657448132".
- Infrared_open-path_detector wikiPageWikiLink Absorption_(electromagnetic_radiation).
- Infrared_open-path_detector wikiPageWikiLink Albedo.
- Infrared_open-path_detector wikiPageWikiLink Aperture.
- Infrared_open-path_detector wikiPageWikiLink Atmospheric_refraction.
- Infrared_open-path_detector wikiPageWikiLink Attenuation_coefficient.
- Infrared_open-path_detector wikiPageWikiLink Band-pass_filter.
- Infrared_open-path_detector wikiPageWikiLink Beer–Lambert_law.
- Infrared_open-path_detector wikiPageWikiLink Borosilicate_glass.
- Infrared_open-path_detector wikiPageWikiLink Capacitor.
- Infrared_open-path_detector wikiPageWikiLink Category:Chemical_engineering.
- Infrared_open-path_detector wikiPageWikiLink Category:Detectors.
- Infrared_open-path_detector wikiPageWikiLink Category:Fire_prevention.
- Infrared_open-path_detector wikiPageWikiLink Category:Gas_sensors.
- Infrared_open-path_detector wikiPageWikiLink Category:Offshore_engineering.
- Infrared_open-path_detector wikiPageWikiLink Category:Oil_platforms.
- Infrared_open-path_detector wikiPageWikiLink Category:Oil_refineries.
- Infrared_open-path_detector wikiPageWikiLink Category:Optics.
- Infrared_open-path_detector wikiPageWikiLink Category:Optoelectronics.
- Infrared_open-path_detector wikiPageWikiLink Category:Petroleum_production.
- Infrared_open-path_detector wikiPageWikiLink Category:Petroleum_technology.
- Infrared_open-path_detector wikiPageWikiLink Category:Safety_equipment.
- Infrared_open-path_detector wikiPageWikiLink Coal_mining.
- Infrared_open-path_detector wikiPageWikiLink Corner_reflector.
- Infrared_open-path_detector wikiPageWikiLink Curvature.
- Infrared_open-path_detector wikiPageWikiLink Digital_signal_processing.
- Infrared_open-path_detector wikiPageWikiLink Dräger.
- Infrared_open-path_detector wikiPageWikiLink Drägerwerk.
- Infrared_open-path_detector wikiPageWikiLink Electrical_equipment_in_hazardous_areas.
- Infrared_open-path_detector wikiPageWikiLink Flashtube.
- Infrared_open-path_detector wikiPageWikiLink Fourier_analysis.
- Infrared_open-path_detector wikiPageWikiLink Gas-discharge_lamp.
- Infrared_open-path_detector wikiPageWikiLink Gas_detector.
- Infrared_open-path_detector wikiPageWikiLink Gas_leak_detection.
- Infrared_open-path_detector wikiPageWikiLink Gradient.
- Infrared_open-path_detector wikiPageWikiLink Honeywell_Analytics.
- Infrared_open-path_detector wikiPageWikiLink Hydrocarbon.
- Infrared_open-path_detector wikiPageWikiLink Hydrogen_sulfide.
- Infrared_open-path_detector wikiPageWikiLink Incandescent_light_bulb.
- Infrared_open-path_detector wikiPageWikiLink Infrared.
- Infrared_open-path_detector wikiPageWikiLink Infrared_detector.
- Infrared_open-path_detector wikiPageWikiLink Infrared_point_sensor.
- Infrared_open-path_detector wikiPageWikiLink Infrared_window.
- Infrared_open-path_detector wikiPageWikiLink Intrinsic_safety.
- Infrared_open-path_detector wikiPageWikiLink Laser_diode.
- Infrared_open-path_detector wikiPageWikiLink Lead(II)_sulfide.
- Infrared_open-path_detector wikiPageWikiLink Lookup_table.
- Infrared_open-path_detector wikiPageWikiLink Low-noise_amplifier.
- Infrared_open-path_detector wikiPageWikiLink Lower_flammable_limit.
- Infrared_open-path_detector wikiPageWikiLink Methane.
- Infrared_open-path_detector wikiPageWikiLink Microprocessor.
- Infrared_open-path_detector wikiPageWikiLink Modulation.
- Infrared_open-path_detector wikiPageWikiLink Molecular_vibration.
- Infrared_open-path_detector wikiPageWikiLink Nondispersive_infrared_sensor.
- Infrared_open-path_detector wikiPageWikiLink North_Sea_oil.
- Infrared_open-path_detector wikiPageWikiLink North_sea_oil.
- Infrared_open-path_detector wikiPageWikiLink Oil_platform.
- Infrared_open-path_detector wikiPageWikiLink Optical_chopper.
- Infrared_open-path_detector wikiPageWikiLink Optical_coating.
- Infrared_open-path_detector wikiPageWikiLink Petrochemical.
- Infrared_open-path_detector wikiPageWikiLink Petroleum_industry.
- Infrared_open-path_detector wikiPageWikiLink Photoconductivity.
- Infrared_open-path_detector wikiPageWikiLink Photodiode.
- Infrared_open-path_detector wikiPageWikiLink Responsivity.
- Infrared_open-path_detector wikiPageWikiLink Retroreflector.
- Infrared_open-path_detector wikiPageWikiLink Spectral_line.
- Infrared_open-path_detector wikiPageWikiLink Spectral_linewidth.
- Infrared_open-path_detector wikiPageWikiLink Spectral_power_distribution.
- Infrared_open-path_detector wikiPageWikiLink Spectral_resolution.
- Infrared_open-path_detector wikiPageWikiLink Spectrometer.
- Infrared_open-path_detector wikiPageWikiLink Sunlight.
- Infrared_open-path_detector wikiPageWikiLink Toxicity.
- Infrared_open-path_detector wikiPageWikiLink Water_treatment.
- Infrared_open-path_detector wikiPageWikiLinkText "Infrared open-path detector".
- Infrared_open-path_detector hasPhotoCollection Infrared_open-path_detector.
- Infrared_open-path_detector subject Category:Chemical_engineering.
- Infrared_open-path_detector subject Category:Detectors.
- Infrared_open-path_detector subject Category:Fire_prevention.
- Infrared_open-path_detector subject Category:Gas_sensors.
- Infrared_open-path_detector subject Category:Offshore_engineering.
- Infrared_open-path_detector subject Category:Oil_platforms.
- Infrared_open-path_detector subject Category:Oil_refineries.
- Infrared_open-path_detector subject Category:Optics.
- Infrared_open-path_detector subject Category:Optoelectronics.
- Infrared_open-path_detector subject Category:Petroleum_production.
- Infrared_open-path_detector subject Category:Petroleum_technology.
- Infrared_open-path_detector subject Category:Safety_equipment.
- Infrared_open-path_detector type Detector.
- Infrared_open-path_detector type Discipline.
- Infrared_open-path_detector type Platform.
- Infrared_open-path_detector type Science.
- Infrared_open-path_detector type Sensor.
- Infrared_open-path_detector type Technology.
- Infrared_open-path_detector comment "Infrared open-path gas detectors send out a beam of infrared light, detecting gas anywhere along the path of the beam. This linear 'sensor' is typically a few metres up to a few hundred metres in length.".
- Infrared_open-path_detector label "Infrared open-path detector".