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Theoretical characterization of a gas path debris detection monitoring system based on electrostatic sensors and charge amplifiers
Affiliation:1. Dept. of Information Engineering and Mathematical Sciences, University of Siena, Via Roma 56, 53100 Siena, Italy;2. GE Oil & Gas Nuovo Pignone, Via Felice Matteucci 2, 50127 Florence, Italy;1. School of Transportation Science and Engineering, Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control, Beihang University, Beijing 100191, China;2. School of Economics and Management, Beihang University, Beijing 100191, China;3. Beijing Key Lab of Urban Intelligent Traffic Control Technology, North China University of Technology, Beijing 100041, China;4. Department of Mathematics and Statistics, Curtin University, WA 6845, Australia;1. Photonics Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Department of Physics, Northwest University, Xi’an, Shaanxi 710069, China;3. Department of Electrical and Electronic Engineering, The University of Nottingham Malaysia Campus, 43500, Malaysia;1. Centro de Geofísica de Évora, Universidade de Évora, Portugal;2. Deutscher Wetterdienst, Hohenpeißenberg Meteorological Observatory, Albin-Schwaiger-Weg 10, 82383 Hohenpeißenberg, Germany;3. Instituto de Telecomunicações, Universidade de Évora, Portugal
Abstract:The electrostatic detection of gas path debris has been proposed in literature as a tool to monitor mechanical component faults along the combustion gas path of turbo-machines. In this paper we discuss the general theoretical characterization of a debris detection monitoring system based on electrostatic sensors and charge amplifiers. We first provide the analytical expression of the time-varying charge induced by the moving debris on the sensor surface. After introducing a simplified electric model of the charge amplifier, we discuss the effects of the amplifier bandwidth on the shape of the output voltage signal. Theoretical results have been validated with experiments.
Keywords:Condition monitoring  Electrostatic sensor  Charge amplifier  Gas turbo-machines  Debris monitoring
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