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- Hydroxyl_tagging_velocimetry abstract "Hydroxyl tagging velocimetry (HTV) is a velocimetry method used in humid air flows. Themethod is often used in high-speed combusting flows because the high velocity and temperatureaccentuate its advantages over similar methods. HTV uses a laser (often an argon-fluorideexcimer laser operating at ~193 nm) to dissociate the water in the flow into H + OH. Before entering the flow optics areused to create a grid of laser beams. The water in the flow is dissociated only where beams ofsufficient energy pass through the flow, thus creating a grid in the flow where theconcentrations of hydroxyl (OH) are higher than in the surrounding flow. Another laser beam (at either ~248 nm or ~308 nm) inthe form of a sheet is also passed through the flow in the same plane as the grid. This laserbeam is tuned to a wavelength that causes the hydroxyl molecules to fluoresce in the UV spectrum. The fluorescence is then captured by a charge-coupled device (CCD) camera. Usingelectronic timing methods the picture of the grid can be captured at nearly the same instantthat the grid is created.By delaying the pulse of the fluorescence laser and the camera shot an image of the grid thathas now displaced downstream can be captured. Computer programs are then used to compare thetwo images and determine the displacement of the grid. By dividing the displacement by the knowntime delay the two dimensional velocity field (in the plane of the grid) can be determined.Other Molecular tagging velocimetry (MTV) methods have used ozone (O3), excited oxygen and nitric oxide as the tag instead of hydroxyl. In the case of ozone the method is known as Ozone tagging velocimetry or OTV. OTV has been developed and tested in many room air temperature applications with very accurate test results. OTV consists of an initial "write" step, where a 193-nm pulsed excimer laser creates ozone grid lines via oxygen (O2) UV absorption, and a subsequent "read" step, where a 248-nm excimer laser photodissociates the formed O3 and fluoresces the vibrationally excited O2 product thus revealing the grid lines' displacement.".
- Hydroxyl_tagging_velocimetry wikiPageExternalLink ao.pdf.
- Hydroxyl_tagging_velocimetry wikiPageExternalLink HTV3.pdf.
- Hydroxyl_tagging_velocimetry wikiPageExternalLink MST-J.pdf.
- Hydroxyl_tagging_velocimetry wikiPageExternalLink htv.pdf.
- Hydroxyl_tagging_velocimetry wikiPageExternalLink AppliedOpticsHtvSignalOptRibNov05.pdf.
- Hydroxyl_tagging_velocimetry wikiPageID "1973309".
- Hydroxyl_tagging_velocimetry wikiPageLength "4766".
- Hydroxyl_tagging_velocimetry wikiPageOutDegree "21".
- Hydroxyl_tagging_velocimetry wikiPageRevisionID "509967734".
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Category:Fluid_dynamics.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Category:Laser_applications.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Category:Measurement.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Category:Measuring_instruments.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Category:Transport_phenomena.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Charge-coupled_device.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Excimer_laser.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Fluorescence.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Hydroxyl.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Molecular_tagging_velocimetry.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Optics.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Oxygen.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Ozone.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink UV.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink UV_spectrum.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Ultraviolet.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Ultraviolet–visible_spectroscopy.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Velocimetry.
- Hydroxyl_tagging_velocimetry wikiPageWikiLink Wavelength.
- Hydroxyl_tagging_velocimetry wikiPageWikiLinkText "Hydroxyl tagging velocimetry".
- Hydroxyl_tagging_velocimetry wikiPageWikiLinkText "hydroxyl tagging velocimetry".
- Hydroxyl_tagging_velocimetry hasPhotoCollection Hydroxyl_tagging_velocimetry.
- Hydroxyl_tagging_velocimetry wikiPageUsesTemplate Template:Cite_journal.
- Hydroxyl_tagging_velocimetry wikiPageUsesTemplate Template:Unreferenced.
- Hydroxyl_tagging_velocimetry subject Category:Fluid_dynamics.
- Hydroxyl_tagging_velocimetry subject Category:Laser_applications.
- Hydroxyl_tagging_velocimetry subject Category:Measurement.
- Hydroxyl_tagging_velocimetry subject Category:Measuring_instruments.
- Hydroxyl_tagging_velocimetry subject Category:Transport_phenomena.
- Hydroxyl_tagging_velocimetry hypernym Method.
- Hydroxyl_tagging_velocimetry type Article.
- Hydroxyl_tagging_velocimetry type Instrument.
- Hydroxyl_tagging_velocimetry type Software.
- Hydroxyl_tagging_velocimetry type Application.
- Hydroxyl_tagging_velocimetry type Article.
- Hydroxyl_tagging_velocimetry type Dynamic.
- Hydroxyl_tagging_velocimetry type Instrument.
- Hydroxyl_tagging_velocimetry type Laser.
- Hydroxyl_tagging_velocimetry type Mechanic.
- Hydroxyl_tagging_velocimetry type Science.
- Hydroxyl_tagging_velocimetry type Tool.
- Hydroxyl_tagging_velocimetry comment "Hydroxyl tagging velocimetry (HTV) is a velocimetry method used in humid air flows. Themethod is often used in high-speed combusting flows because the high velocity and temperatureaccentuate its advantages over similar methods. HTV uses a laser (often an argon-fluorideexcimer laser operating at ~193 nm) to dissociate the water in the flow into H + OH. Before entering the flow optics areused to create a grid of laser beams.".
- Hydroxyl_tagging_velocimetry label "Hydroxyl tagging velocimetry".
- Hydroxyl_tagging_velocimetry sameAs m.06b3m6.
- Hydroxyl_tagging_velocimetry sameAs Q5955596.
- Hydroxyl_tagging_velocimetry sameAs Q5955596.
- Hydroxyl_tagging_velocimetry wasDerivedFrom Hydroxyl_tagging_velocimetry?oldid=509967734.
- Hydroxyl_tagging_velocimetry isPrimaryTopicOf Hydroxyl_tagging_velocimetry.