CHARACTERIZATION AND FIRST APPLICATION OF A THIN-FILM ELECTRET UNSTEADY PRESSURE MEASUREMENT TECHNIQUE
2008 (English)In: XIX Biannual Symposium on Measuring Techniques in Turbomachinery: Transonic and Supersonic Flow in Cascades and Turbomachines, Brussels: Von Karman Institute for Fluid Dynamics , 2008, 1-5 p.Conference paper (Other academic)
A new thin-film electret unsteady pressure measurement technique for application in turbomachine aerodynamical experiments is under investigation. The technique is based on a layered sensor comprising a permanently polarized foil in the center. Changes in foil thickness due to variation in pressure result in a potential difference, which is used as measurement signal. The investigated technique presents a cost attractive alternative for unsteady pressure measurement instrumentation. Low signal levels however put severe requirements to acquisition and the treatment of the signals, especially when reducing the sensor area. First measurements have been performed with a 2.5x2.5mm sensor. The signals have been correlated to Kulite data and good agreement has been found. A characterization of the technique as well a description of the first tests in relevant flow is presented in the paper.
Place, publisher, year, edition, pages
Brussels: Von Karman Institute for Fluid Dynamics , 2008. 1-5 p.
IdentifiersURN: urn:nbn:se:kth:diva-53679ISBN: 978-2-930389-32-XOAI: oai:DiVA.org:kth-53679DiVA: diva2:470615
XIX Biannual symposium on measuring techniques in turbomachinery
QC 201201022012-01-022011-12-292012-01-02Bibliographically approved