Dielectric barrier discharges during the generation of ferroelectrets: Optical spectroscopy for process monitoring

Xunlin Qiu, Axel Mellinger, Werner Wirges, Reimund Gerhard

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

The transient light emission from the dielectric barrier discharges (DBDs) in cellular polypropylene ferroelectrets subjected to high electric fields was quantitatively measured and correlated with the piezoelectric d33 coefficient. The spectrum shows strong emission from the second positive system (SPS) of molecular nitrogen N2 (C3 Πu→ B3 Πg and the first negative system (FNS) of N 2+(B2Σu+→ X2Σg+), consistent with a DBD in air. When a dc ramp voltage is applied to the ferroelectret film, light emission starts above a threshold level, which coincides with the threshold voltage for obtaining piezoelectricity. Additionally, light emission from "back discharges" is observed when the voltage is decreased back to zero. Thus, spectroscopic analysis of the light emitted during charging of ferroelectrets can be employed to carefully monitor, better understand, and further optimize the underlying DBD process.

Original languageEnglish
Article number4451487
Pages (from-to)828-831
Number of pages4
JournalAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
DOIs
StatePublished - 2007
Event2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP - Vancouver, BC, Canada
Duration: Oct 14 2007Oct 19 2007

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