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Improvements to the electrothermal modelling of conventional and dual element microbolometers
Thesis (PhD(Electrical Engineering))--University of Pretoria, 2017.
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| Format: | Thesis |
| Language: | English |
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2018
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| _version_ | 1867613697421082624 |
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| access_status_str | Open Access |
| author2 | Du Plessis, Monuko |
| author_browse | Du Plessis, Monuko |
| author_facet | Du Plessis, Monuko |
| collection | Thesis |
| description | Thesis (PhD(Electrical Engineering))--University of Pretoria, 2017. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/64745 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:40:15.875Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/64745 Improvements to the electrothermal modelling of conventional and dual element microbolometers Du Plessis, Monuko johan.schoeman@eng.up.ac.za Schoeman, Johan Thesis (PhD(Electrical Engineering))--University of Pretoria, 2017. The thesis contributes to the understanding of the influence of detector material and geometry on heat flow in integrated microbolometer systems. Microbolometers are key technological components for a large range of thermal applications and well represented in the marketplace. Despite their ubiquity, their modelling is surprisingly inaccurate. The proposed models, covering different fabrication technologies and operating conditions, make major contributions to the predictability of the microbolometer performance with up to 40% improvements compared to conventional methods, in turn allowing for more complex bolometer concepts. In particular: i) A lumped description of the geometry assumes an ellipse rather than the conventional rectangular geometry, which closer resembles the simulated temperature distribution of the absorber. ii) The separation of the device geometry into separate lumped thermal elements, augmented by coupling coefficients, which link them together and better capture the thermal network and the modes of heat transfer among multiple resistive components sharing the microbolometer structure. iii) The entire bolometer is captured as a linear set of equations, which properly describes selfheating and the effective thermal impedance of the system. Based on the comprehensive comparison between conventional and proposed analytic models, a wide variety of finite element simulations and a number of careful experimental measurements, it is conclusively shown that the proposed models significantly outperform the conventional methods. Furthermore, the extended complex structure models accurately predict the simulated and measured device behaviour. The latter allows for the development of new integrated electrothermal systems with confidence. AMTS-07-28-E Electrical, Electronic and Computer Engineering PhD(Electrical Engineering) Unrestricted 2018-05-02T06:42:36Z 2018-05-02T06:42:36Z 2018-05-03 2017-12 Dissertation Schoeman, J, 2018, Improvements to the electrothermal modelling of conventional and dual element microbolometers, PhD thesis, University of Pretoria http://hdl.handle.net/2263/64745 en application/pdf |
| spellingShingle | Improvements to the electrothermal modelling of conventional and dual element microbolometers |
| title | Improvements to the electrothermal modelling of conventional and dual element microbolometers |
| title_full | Improvements to the electrothermal modelling of conventional and dual element microbolometers |
| title_fullStr | Improvements to the electrothermal modelling of conventional and dual element microbolometers |
| title_full_unstemmed | Improvements to the electrothermal modelling of conventional and dual element microbolometers |
| title_short | Improvements to the electrothermal modelling of conventional and dual element microbolometers |
| title_sort | improvements to the electrothermal modelling of conventional and dual element microbolometers |
| url | http://hdl.handle.net/2263/64745 |