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- W2000654517 abstract "For the study of combustion driven pressure fluctuations an adequate measurement technique has to be designed, which enables its application under hot conditions while covering a wide dynamic range. To overcome disadvantages of measurement techniques used up to now for this research topic, a new sensor has been designed based on the optical measurement technique of interferometry. Here, an interferometer is coupled via a glass fiber with a reflecting membrane which is acoustically excited, thus the measured membrane displacements correlate to the acoustic field in the test section. Two dierent interferometer designs were successfully tested to build such an optical sensor and will be presented in this paper. The first design employs a commercial Mach-Zehnder interferometer and has been used for several acoustic measurements under cold conditions, but also for the detection of a combustion induced pressure fluctuation in the exhaust gas duct of an atmospheric combustion test rig. The second interferometric setup is based on a fiber based Fabry-Perot interferometer. Starting from a classical homodyne interferometer this setup has been modified to reach a sensitivity which enables the detection of acoustically induced membrane movements. This setup has been extensively studied under cold conditions and is currently prepared for the application in an atmospheric combustion chamber. Observations of several pre-studies for a safe hot application of this new sensor are discussed." @default.
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- W2000654517 date "2009-05-11" @default.
- W2000654517 modified "2023-10-01" @default.
- W2000654517 title "Design and Application of Fiber-Optic Microphones for Thermo-Acoustic Measurements" @default.
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- W2000654517 cites W2136579376 @default.
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- W2000654517 doi "https://doi.org/10.2514/6.2009-3300" @default.
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