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Title: Thin film sensors for aerospace applications
Author: Barker, A. J.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1995
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Since Frank Whittle demonstrated the first flight of an aircraft propelled by a turbo-jet engine in the early 1940's the aerospace industry has moved forward at a tremendous pace. Although the principle of operation of such engines has changed little in this time, their performance has soared. During the design and prototype stage of an engine, fluid dynamics models must be proved to ensure flow conditions do not adversely effect the performance. As an aid to this testing, thin film sensors capable of being fabricated directly on vital components have been designed, constructed and tested, for a variety of applications. Three sensors have been concentrated upon: the strain gauge, the hot film anemometer and the pressure sensor. All sensors have been constructed using r.f. plasma enhanced chemical vapour deposition, r.f. magnetron sputtering, photolithography and etching. Thin film strain gauges have been fabricated on special substrates and tested under fatigue conditions. The gauge factor of such devices was approximately 1.8. Flow sensors have been fabricated on flat and cylindrical substrates and tested using an in-house constructed wind tunnel. Thin film anemometers with frequency responses of several hundred kiloHertz have been fabricated, compared to several tens of kiloHertz for the commercial sensor tested. In addition to this, a novel, indirectly heated device has been fabricated, and shows increased sensitivity. Flow sensors have been used to determine the state of the boundary layer under varying flow conditions.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available