简介：43.05.History;43.10.General;43.15.Standards;43.20.Generallinearacoustics;43.25.Nonlinearacoustics;43.28.Aeroacousticsandatmosphericsound;43.30.Underwatersound;43.35.Ultrasonics,quantumacoustics,andphysicaleffectsofsound;43.38.Transduction,acousticaldevicesforthegen-erationandreproductionofsound;43.40.Structuralacousticsandvibration;43.50.Noise:itseffectsandcontrol;43.55.Architecturalacoustics;43.58.Acousticalmeasurementsandinstrumentation;43.60.Acousticsignalprocessing;43.64.Physiologicalacoustics;43.66.Psychologicalacoustics;43.70.Speechproduction;43.71.Speechperception;43.72.Speechprocessingandcommunicationsystems;43.75.Musicandmusicalinstruments;43.80.Bioacoustics.

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简介：

简介：Numericalanalysisofthree-dimensionalsoundpropagationinsoft-softorsoft-hardcircularductswithcircumferentialandaxialmodesofsoundsourcesattheinlethasbeencarriedout.Inthispaper,thenumericalmethodandthesamplesareofferedandtheeffectsofcircumferentialandaxialmodesonnumericalresultsarediscussedindetail.

简介：Simpleandefficientsurfaceacousticwave(SAW)two-portresonatorswithlowinsertionlossandhighQ-valuesonST-Xquartzsubstrateusingacorrosion-proofA1/Au-stripeelectrodestructurearedevelopedforgassensing.Itwascomposedoftwoshortedgratingreflectorsandadjacentintedigitaltransducers(IDT),andanactivemetalfilminthecavitybetweentheIDTsforthesensitivefilmcoating.Thedevicesareexpectedtoprovidegoodprotectiontowardsmetalelectrodeforgassensorsapplicationinchemicallyreactiveenvironments.Excellentdeviceperformanceaslowinsertionloss,highQfactorandsingle-modeareachievedbycarefullyselectingthemetallicelectrodethickness,cavitylengthandacousticaperture.Priortofabrication,thecouplingofmodes(COM)modelwasperformedfordevicesimulationtodeterminetheoptimaldesignparameters.Thefabricatedsingle-modeSAWresonatoratoperationfrequencyof300MHzrangeexhibitsmatchedinsertionlossof~6.5dBandloadedQfactorinthe3000range.Usingthefabricatedresonatorasthefeedbackelement,adualresonator-oscillatorwithexcellentfrequencystability(0.1ppm)wasdevelopedandevaluatedexperimentally,anditissignificantforperformanceimprovementofSAWgassensor.