A high temperature resistant fiber-optical microphone (FOM) was developed and successfully applied in a combustion chamber at a thermal power of 8.4 kW to measure thermo-acoustic oscillations at a frequency of 85 Hz and a sound pressure level of 154 dB. The sensor head temperature was estimated to . The core of the optical setup used for the FOM is a Fabry–Perot interferometer. To create an acoustical sensor based on this type of interferometer, a new method of generation and postprocessing of the interference signal was developed. The simple replaceability of the sensor membrane reduces the requirements concerning the sensor handling compared with conventional condenser microphones and allows the adaptation of the sensor sensitivity to its application case changing the membrane stiffness.
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e-mail: holger.konle@pi.tu-berlin.de
e-mail: oliver.paschereit@tu-berlin.de
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January 2011
Research Papers
Application of Fiber-Optical Microphone for Thermo-Acoustic Measurements
Holger J. Konle,
e-mail: holger.konle@pi.tu-berlin.de
Holger J. Konle
Technische Universität Berlin
, Müller-Breslau-Strasse 8, 10623 Berlin, Germany
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Christian O. Paschereit,
e-mail: oliver.paschereit@tu-berlin.de
Christian O. Paschereit
Technische Universität Berlin
, Müller-Breslau-Strasse 8, 10623 Berlin, Germany
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Ingo Röhle
Ingo Röhle
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Holger J. Konle
Technische Universität Berlin
, Müller-Breslau-Strasse 8, 10623 Berlin, Germanye-mail: holger.konle@pi.tu-berlin.de
Christian O. Paschereit
Technische Universität Berlin
, Müller-Breslau-Strasse 8, 10623 Berlin, Germanye-mail: oliver.paschereit@tu-berlin.de
Ingo Röhle
J. Eng. Gas Turbines Power. Jan 2011, 133(1): 011602 (8 pages)
Published Online: September 14, 2010
Article history
Revised:
April 8, 2010
Received:
April 8, 2010
Online:
September 14, 2010
Published:
September 14, 2010
Citation
Konle, H. J., Paschereit, C. O., and Röhle, I. (September 14, 2010). "Application of Fiber-Optical Microphone for Thermo-Acoustic Measurements." ASME. J. Eng. Gas Turbines Power. January 2011; 133(1): 011602. https://doi.org/10.1115/1.4001983
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