Filamentary anemometry using femtosecond laser-extended electric discharge - FALED
(2018) In Optics Express 26(16). p.21132-21140- Abstract
We demonstrate a non-contact spatiotemporally resolved comprehensive method for gas flow velocity field measurement: Filamentary Anemometry using femtosecond Laser-extended Electric Discharge (FALED). A faint thin plasma channel was generated in ambient air by focusing an 800-nm laser beam of 45 fs, which was used to ignite a pulsed electric discharge between two electrodes separated over 10 mm. The power supplier provided a maximum voltage up to 5 kV and was operated at a burst mode with a current duration of less than 20 ns and a pulse-to-pulse separation of 40 μs. The laser-guided thin filamentary discharge plasma column was blowing up perpendicularly by an air jet placed beneath in-between the two electrodes. Although the discharge... (More)
We demonstrate a non-contact spatiotemporally resolved comprehensive method for gas flow velocity field measurement: Filamentary Anemometry using femtosecond Laser-extended Electric Discharge (FALED). A faint thin plasma channel was generated in ambient air by focusing an 800-nm laser beam of 45 fs, which was used to ignite a pulsed electric discharge between two electrodes separated over 10 mm. The power supplier provided a maximum voltage up to 5 kV and was operated at a burst mode with a current duration of less than 20 ns and a pulse-to-pulse separation of 40 μs. The laser-guided thin filamentary discharge plasma column was blowing up perpendicularly by an air jet placed beneath in-between the two electrodes. Although the discharge pulse was short, the conductivity of the plasma channel was observed to sustain much longer, so that a sequence of discharge filaments was generated as the plasma channel being blown up by the jet flow. The sequential bright thin discharge filaments can be photographed using a household camera to calculate the flow velocity distribution of the jet flow. For a direct comparison, a flow field measurement using FLEET [Michael, Appl. Opt. 50, 5158 (2011)] was also performed. The results indicate that the FALED technique can provide instantaneous nonintrusive flow field velocity measurement with good accuracy.
(Less)
- author
- Li, Bo ; Tian, Yifu ; Gao, Qiang LU ; Zhang, Dayuan ; Li, Xiaofeng ; Zhu, Zhifeng and Li, Zhongshan LU
- organization
- publishing date
- 2018-08-06
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Optics Express
- volume
- 26
- issue
- 16
- pages
- 9 pages
- publisher
- Optical Society of America
- external identifiers
-
- scopus:85051089951
- pmid:30119417
- ISSN
- 1094-4087
- DOI
- 10.1364/OE.26.021132
- language
- English
- LU publication?
- yes
- id
- 3388c0f9-4fd3-4191-a0dd-e184b3faf8de
- date added to LUP
- 2018-08-21 11:30:57
- date last changed
- 2024-07-08 17:40:32
@article{3388c0f9-4fd3-4191-a0dd-e184b3faf8de,
abstract = {{<p>We demonstrate a non-contact spatiotemporally resolved comprehensive method for gas flow velocity field measurement: Filamentary Anemometry using femtosecond Laser-extended Electric Discharge (FALED). A faint thin plasma channel was generated in ambient air by focusing an 800-nm laser beam of 45 fs, which was used to ignite a pulsed electric discharge between two electrodes separated over 10 mm. The power supplier provided a maximum voltage up to 5 kV and was operated at a burst mode with a current duration of less than 20 ns and a pulse-to-pulse separation of 40 μs. The laser-guided thin filamentary discharge plasma column was blowing up perpendicularly by an air jet placed beneath in-between the two electrodes. Although the discharge pulse was short, the conductivity of the plasma channel was observed to sustain much longer, so that a sequence of discharge filaments was generated as the plasma channel being blown up by the jet flow. The sequential bright thin discharge filaments can be photographed using a household camera to calculate the flow velocity distribution of the jet flow. For a direct comparison, a flow field measurement using FLEET [Michael, Appl. Opt. 50, 5158 (2011)] was also performed. The results indicate that the FALED technique can provide instantaneous nonintrusive flow field velocity measurement with good accuracy.</p>}},
author = {{Li, Bo and Tian, Yifu and Gao, Qiang and Zhang, Dayuan and Li, Xiaofeng and Zhu, Zhifeng and Li, Zhongshan}},
issn = {{1094-4087}},
language = {{eng}},
month = {{08}},
number = {{16}},
pages = {{21132--21140}},
publisher = {{Optical Society of America}},
series = {{Optics Express}},
title = {{Filamentary anemometry using femtosecond laser-extended electric discharge - FALED}},
url = {{http://dx.doi.org/10.1364/OE.26.021132}},
doi = {{10.1364/OE.26.021132}},
volume = {{26}},
year = {{2018}},
}