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Optimized strategies for thermal re-activation of LaF3/Pt-sensors based on photothermal characterization

  • Gas sensors based on a semiconductor-supported LaF3/Pt-structure require regular re-activation by thermal treatment. A convenient way to accomplish this is by applying an electrical current pulse to the Pt-electrode and controlling re-activation by the amount of Joule heat deposited. Pulse length has to be chosen to balance the requirements of thermal energy needed for re-activation and the constraints in peak thermal power to prevent damage. Prerequisite to optimization is a knowledge of the thermal response of the complicated thin film sensor system consisting of several layers with unknown thermal properties. Modulated photothermal microscopy was used to detect inhomogenities in thin film heating and early stages of failure under thermal load. It was found that the formation of gas bubbles in the film is one of the major sources of failure. These measurements were complemented by measurements of …

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Metadaten
Author:Jürgen Hartmann
Parent Title (English):AIP Conference Proceedings (463)
Publisher:American Institute of Physics
Document Type:Conference Proceeding
Language:English
Year of publication:1999
Publishing Institution:Hochschule für Angewandte Wissenschaften Würzburg-Schweinfurt
Release Date:2020/12/04
First Page:398
Last Page:400
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 536 Wärme
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