Bibliographic Details
| Title: |
Comparative analysis of isothermal decay of the surface potential of fluoroethylenepropylene electrets and of the sensitivity of electret microphones at elevated temperature |
| Authors: |
André Gerlach, Marko Liebler, Gerhard M. Sessler, Heinz von Seggern, Bernd Scheufele, Erhard Hirth |
| Source: |
AIP Advances, Vol 10, Iss 9, Pp 095313-095313-11 (2020) |
| Publisher Information: |
AIP Publishing LLC, 2020. |
| Publication Year: |
2020 |
| Collection: |
LCC:Physics |
| Subject Terms: |
Physics, QC1-999 |
| More Details: |
It is well known that fluorocarbon electrets, although thermally very stable, suffer a surface potential decay if exposed to high temperatures. This potential decay is of considerable interest in applications, for example, in the so-called prepolarized microphones. As a result, these devices suffer a loss in sensitivity approximately proportional to the decay of the electret surface potential. Since the potential and the related sensitivity losses are very slow at room temperature, a common approach in the literature is to perform accelerated isothermal depolarization experiments at elevated temperatures, and extrapolate the results to lower temperatures by assuming an Arrhenius-type behavior. In this paper, we investigate experimentally the potential decay of differently pre-annealed fluoroethylenepropylene electrets of different thicknesses, as well as the drop of sensitivity of commercially available measurement microphones from several manufacturers by the exposure to an ambient temperature of 95 °C for up to three years. Until now, no other reports compare electret and microphone decays over such a long period. The experimental data presented here could not be fitted with only one exponential decay function over the whole time-span investigated. However, assuming two or more discharge processes results in a good agreement between measurement and model functions. The time constants of these decay processes are specified in the text. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2158-3226 |
| Relation: |
https://doaj.org/toc/2158-3226 |
| DOI: |
10.1063/5.0016219 |
| Access URL: |
https://doaj.org/article/820ae0025c5141fd9d94bbafd42417b9 |
| Accession Number: |
edsdoj.820ae0025c5141fd9d94bbafd42417b9 |
| Database: |
Directory of Open Access Journals |
