TY  - JOUR
A1  - Mellinger, Axel
A1  - Flores Suárez, Rosaura
A1  - Singh, Rajeev
A1  - Wegener, Michael
A1  - Wirges, Werner
A1  - Gerhard, Reimund
T1  - Zerstörungsfreie Tomographie von Raumladungs- und Polarisationsverteilungen mittles Wärmepulsen
N2  - Non-destructive, three-dimensional imaging of space-charge and polarization distributions in electret materials has been implemented by means of laser-induced thermal pulses. In pyroelectric films of poled poly(vinylidene fluoride), images of up to 45 x 45 pixels with a depth resolution of less than 0.5 mu m and a lateral resolution of 40 mu m were recorded, the latter being limited by fast thermal diffusion in the absorbing metallic front electrode. Initial applications include the analysis of polarization distributions in corona-poled piezoelectric sensor cables and the detection of patterned space-charge distributions in polytetrafluoroethylene films.
Y1  - 2007
UR  - http://www.oldenbourg-link.com/loi/teme
U6  - https://doi.org/10.1524/teme.2007.74.9.437
SN  - 0171-8096
ER  - 
TY  - JOUR
A1  - Basso, Heitor Cury
A1  - Altafim, Ruy Alberto Pisani
A1  - Altafim, Ruy Alberto Pisani
A1  - Mellinger, Axel
A1  - Fang, Peng
A1  - Wirges, Werner
A1  - Gerhard, Reimund
T1  - Three-layer ferroelectrets from perforated Teflon-PTFE films fused between two homogeneous Teflon-FEP films
Y1  - 2007
SN  - 978-1-4244-1482-6
ER  - 
TY  - JOUR
A1  - Qiu, Xunlin
A1  - Mellinger, Axel
A1  - Wirges, Werner
A1  - Gerhard, Reimund
T1  - Spectroscopic study of dielectric barrier discharges in cellular polypropylene ferroelectrets
N2  - The transient light emission from the dielectric barrier discharges (DBDs) in cellular polypropylene ferroelectrets subjected to high electric poling fields was spectroscopically measured. The spectrum shows strong emission from the second positive system of molecular nitrogen, N-2(C (3)Pi(u))-> N-2(B (3)Pi(g)), and the first negative system of N-2(+), N-2(+)(B (2)Sigma(+)(u))-> N-2(+)(X (2)Sigma(+)(g)), consistent with a DBD in air. When a dc voltage is applied stepwise to the ferroelectret film, light emission starts above a threshold, coinciding with the threshold voltage in obtaining piezoelectricity. From selected vibronic band strength ratios, the electric field in the discharge was determined and found to agree with Townsend breakdown.
Y1  - 2007
UR  - http://apl.aip.org/
U6  - https://doi.org/10.1063/1.2786597
ER  - 
TY  - JOUR
A1  - Qiu, Xunlin
A1  - Mellinger, Axel
A1  - Wirges, Werner
A1  - Gerhard, Reimund
T1  - Dielectric barrier discharges during the generation of ferroelectrets : optical spectroscopy for process monitoring
Y1  - 2007
SN  - 978-1-4244-1482-6
ER  - 
TY  - JOUR
A1  - Qiu, Xunlin
A1  - Mellinger, Axel
A1  - Wegener, Michael
A1  - Wirges, Werner
A1  - Gerhard, Reimund
T1  - Barrier discharges in cellular polypropylene ferroelectrets : how do they influence the electromechanical properties?
Y1  - 2007
ER  -