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A wideband spectrometer for the measurement of permittivity
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Pring, Philip (1989) A wideband spectrometer for the measurement of permittivity. PhD thesis, University of Warwick.
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WRAP_Theses_Pring_1989.pdf - Submitted Version - Requires a PDF viewer. Download (4Mb) | Preview |
Official URL: http://webcat.warwick.ac.uk/record=b3197275~S15
Abstract
Measurements of dielectric relaxations below 1 GHz, and over a wide temperature range, can yield important information on the dynamics of dipoles at both the microscopic and macroscopic levels. Complete characterisations of materials over this region are rare and normally require the integration of several measuring techniques. Although advances in electronics have extended the range of existing techniques, there remains, however, a need for an instrument of superior bandwidth. The present work addresses this problem and is concerned specifically with the methodology and implementation of an automated spectrometer designed to measure the complex permittivity of solids over 13 decades of frequency (between 10⁻⁵ Hz and 10⁸ Hz) and at temperatures between -185 °C and +600 °C.
Following reviews of current theory and experimental methods, the design and operational criteria of the spectrometer are discussed in principle and in detail. The structure of the operating software is described and examples of algorithms are given.
The successful operation of the spectrometer is demonstrated by experiment, including isothermal investigations of the dielectric behaviour of poly(methylmethacrylate) at 35 °C and low density poly(ethylene) at 30 °C.
| Item Type: | Thesis (PhD) | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Library of Congress Subject Headings (LCSH): | Spectrometer -- Design and construction, Dielectrics, Dielectric relaxation, Magnetic dipoles | ||||
| Official Date: | August 1989 | ||||
| Dates: |
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| Institution: | University of Warwick | ||||
| Theses Department: | Department of Physics | ||||
| Thesis Type: | PhD | ||||
| Publication Status: | Unpublished | ||||
| Supervisor(s)/Advisor: | Smith, M. J. A. | ||||
| Sponsors: | Science and Engineering Research Council (Great Britain) ; University of Warwick. Department of Physics ; University of Warwick. Research and Innovations Sub-Committee | ||||
| Format of File: | |||||
| Extent: | 118 leaves : illustrations, charts | ||||
| Language: | eng |
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