Transition Detection in Cruise Flight Using a Resistant Multi-Sensor Hot-Film Technique

Hausmann, Felix; Schröder, Wolfgang

doi:10.2514/6.2004-1047

Cited by 3 publications

(2 citation statements)

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“…In particular, thin film anemometers arranged in an array on a flexible substrate are employed to coat airfoils in a surface conformal way, measuring flow conditions during cruise flight up to an altitude of 10,000 m (Hausmann and Schröder 2004). Due to a precise detection and local manipulation of the laminar-turbulent boundary layer transition on the wing, fuel savings of up to 30% are reported in the literature (Hausmann et al 2002).…”

Section: Introductionmentioning

confidence: 99%

“…To enhance the long-term stability of hot film anemometers, a proper passivation technology has to be developed and investigated under environmental conditions being representative for the targeted application. State-of-the-art is the use of a Parylene coating, having a thickness of 1 lm (Hausmann and Schröder 2004). Besides the reduction in drift effects, it is required that important device-related parameters, such as characteristic response time or sensitivity, are not substantially deteriorated by the passivation layer.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of aluminium nitride and aluminium oxide thin films sputter-deposited on organic substrates

et al. 2007

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In microsystems technology, passivation layers are generally required to protect micro devices and functional elements against environmental impact, particularly against corrosion, thus increasing reliability and lifetime to acceptable values. In this work, the use of sputter-deposited aluminium oxide and aluminium nitride thin films on flexible polyimide foils was investigated, aiming at the protection of flow sensitive elements. Due to a high defect density located at the interface between the passivation layer and the organic substrate, the adhesion of pure aluminium oxide thin films was found to be poor when applying a combination of mechanical stress (e.g. bombardment with water droplets) and thermal cycling as an accelerated ageing procedure. A bi-layer consisting of aluminium nitride and aluminium oxide, however, shows a defect-free interface to the organic substrate resulting in an enhanced adhesion. In addition, no structural failure can be detected after applying the aging procedure, making this bi-layer approach well suited for the targeted application.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%