Designation:D5527−00(Reapproved2011)StandardPracticesforMeasuringSurfaceWindandTemperaturebyAcousticMeans1ThisstandardisissuedunderthefixeddesignationD5527;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesepracticescoverproceduresformeasuringone-,two-,orthree-dimensionalvectorwindcomponentsandsonictemperaturebymeansofcommerciallyavailablesonicanemometer/thermometersthatemploytheinversetimemea-surementtechnique.Thesepracticesapplytothemeasurementofwindvelocitycomponentsoverhorizontalterrainusinginstrumentsmountedonstationarytowers.Thesepracticesalsoapplytospeedofsoundmeasurementsthatareconvertedtosonictemperaturesbutdonotapplytothemeasurementoftemperaturebytheuseofancillarytemperaturedevices.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1356TerminologyRelatingtoSamplingandAnalysisofAtmospheresD3631TestMethodsforMeasuringSurfaceAtmosphericPressureD4230TestMethodofMeasuringHumiditywithCooled-SurfaceCondensation(Dew-Point)HygrometerE337TestMethodforMeasuringHumiditywithaPsy-chrometer(theMeasurementofWet-andDry-BulbTem-peratures)IEEE/ASTMSI-10AmericanNationalStandardforUseoftheInternationalSystemofUnits(SI):TheModernMetricSystem3.Terminology3.1Definitions—RefertoTerminologyD1356forcommonterminology.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1acceptanceangle(6α,deg)—theangulardistance,centeredonthearrayaxisofsymmetry,overwhichthefollowingconditionsaremet:(a)windcomponentsareunam-biguouslydefined,and(b)flowacrossthetransducersisunobstructedorremainswithinth...
