Optical fiber sensing of corona discharges

G. A. Woolsey

doi:10.1117/12.2321923

1 December 1991 Optical fiber sensing of corona discharges

G. A. Woolsey

Proceedings Volume 1584, Fiber Optic and Laser Sensors IX; (1991) https://doi.org/10.1117/12.2321923
Event: OE Fiber, 1991, Boston, MA, United States

Abstract

Coronas are localized discharges which occur adjacent to high voltage points in gases at around atmospheric pressure. A corona may be in the form ofa steady glow or it may be pulsing. Ions produced in the corona rapidly move away from the point, transfer momentum to the neutral gas molecules and thus generate a corona wind with speeds ofa few meters per second. The corona environment involving high electric fields, small dimensions and often electromagnetic and acoustic noise, is difficult to examine with good spatial resolution using conventional sensing techniques. We have found that the use ofan optical fiber interferometer to study the corona causes negligible disturbance to its voltage, current and structure. By heating a short length of fiber in the corona region with a pulse of CO₂ laser radiation and monitoring the interferometer signal we have measured corona wind speeds, and with a short length of polyvinylidene film bonded to a fiber passing through the corona region, the interferometer has been used to provide information on electric field distribution.

Citation Download Citation

G. A. Woolsey "Optical fiber sensing of corona discharges", Proc. SPIE 1584, Fiber Optic and Laser Sensors IX, (1 December 1991); https://doi.org/10.1117/12.2321923

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