Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/3175
Title: Using an optical fibre anemometer to measure the speed of the electric wind in a negative polarity, atmospheric corona discharge
Contributor(s): Hooper, Adam (author); Lamb, David (author)
Publication Date: 2005
DOI: 10.1088/1742-6596/15/1/037
Handle Link: https://hdl.handle.net/1959.11/3175
Abstract: Coronas are partial discharges that occur in regions of non-uniform electric fields adjacent to conductors stressed to high voltages. Negative, Trichel-pulse coronas in air occur when a dc, negative-polarity, high voltage is applied to a conductor. Trichel pulses in atmospheric air generate significant amounts of ozone as well as electrical and acoustic noise. Under the right conditions these coronas can be a precursor to complete electrical breakdown of the air gap due to a reduction in the density of neutral molecules resulting from a combination of localised heating and convective air flow generated by the movement of negative ions. An optical fibre anemometer, based on a Mach-Zehnder interferometer has been constructed to measure the speed of the wind generated in the point-plane gap of a negative, Trichel-pulse corona discharge in atmospheric air. The sensing arm of the fibre interferometer is subjected to controlled, repetitive bursts of infrared radiation from a CO₂ laser and the combination of localised heating and convective cooling by the corona wind results in fringe shifts which are directly calibrated to the speed of the wind. This paper reports on the nature of the calibration process and presents some radial profiles of wind speed in the corona gap.
Publication Type: Journal Article
Source of Publication: Journal of Physics: Conference Series, 15(1), p. 219-225
Publisher: Institute of Physics and IOP Publishing Limited
Place of Publication: Bristol, UK
ISSN: 1742-6596
Field of Research (FOR): 020504 Photonics, Optoelectronics and Optical Communications
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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