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Application of fiber-optical microphone for thermo-acoustic measurements / Holger J. Konle in Transactions of the ASME . Journal of engineering for gas turbines and power, Vol. 133 N° 1 (Janvier 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 1 (Janvier 2011) . - 08 p. Titre : Application of fiber-optical microphone for thermo-acoustic measurements Type de document : texte imprimé Auteurs : Holger J. Konle, Auteur ; Christian Oliver Paschereit, Auteur ; Ingo Röhle, Auteur Année de publication : 2012 Article en page(s) : 08 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Acoustic  measurement  Acoustic  wave  interferometry  Fibre  optic  sensors  Microphones Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : 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 ~1000 K. 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. DEWEY : 620.1 ISSN : 0742-4795 En ligne : scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ000133000001 [...] [article] Application of fiber-optical microphone for thermo-acoustic measurements [texte imprimé] / Holger J. Konle, Auteur ; Christian Oliver Paschereit, Auteur ; Ingo Röhle, Auteur . - 2012 . - 08 p. Génie Mécanique Langues : Anglais (eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 1 (Janvier 2011) . - 08 p. Mots-clés : Acoustic  measurement  Acoustic  wave  interferometry  Fibre  optic  sensors  Microphones Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : 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 ~1000 K. 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. DEWEY : 620.1 ISSN : 0742-4795 En ligne : scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ000133000001 [...]