【英文标准名称】:StandardPracticeforLeakDetectionandLocationUsingSurface-MountedAcousticEmissionSensors
【原文标准名称】:用表面安装的声辐射探测器作泄漏探测和定位的标准实施规程
【标准号】:ASTME1211-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E07.04
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:声学设备;声学测试;声学;检测;泄漏量;金属;无损检验;工艺;测试
【英文主题词】:acousticemission;continuousmonitoring;hydrotest;leakdetection;nondestructivetesting;pipingsystems;pressurevessels
【摘要】:Leakageofgasorliquidfromapressurizedsystem,whetherthroughacrack,orifice,sealbreak,orotheropening,mayinvolveturbulentorcavitationalflow,whichgeneratesacousticenergyinboththeexternalatmosphereandthesystempressureboundary.Acousticenergytransmittedthroughthepressureboundarycanbedetectedatadistancebyusingasuitableacousticemissionsensor.Withproperselectionoffrequencypassband,sensitivitytoleaksignalscanbemaximizedbyeliminatingbackgroundnoise.Atlowfrequencies,generallybelow100kHz,itispossibleforaleaktoexcitemechanicalresonanceswithinthestructurethatmayenhancetheacousticsignalsusedtodetectleakage.Thispracticeisnotintendedtoprovideaquantitativemeasureofleakrates.1.1Thispracticedescribesapassivemethodfordetectingandlocatingthesteadystatesourceofgasandliquidleakingoutofapressurizedsystem.Themethodemployssurface-mountedacousticemissionsensors(fornon-contactsensorsseeTestMethodE1002),orsensorsattachedtothesystemviaacousticwaveguides(foradditionalinformation,seeTerminologyE1316),andmaybeusedforcontinuousin-servicemonitoringandhydrotestmonitoringofpipingandpressurevesselsystems.Highsensitivitiesmaybeachieved,althoughthevaluesobtainabledependonsensorspacing,backgroundnoiselevel,systempressure,andtypeofleak.1.2Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.SIunitsareprovidedforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:N65
【国际标准分类号】:17_140_01
【页数】:5P.;A4
【正文语种】:


【英文标准名称】:TestMethodforCrystallographicPerfectionofSiliconbyPreferentialEtchTechniques
【原文标准名称】:用优先蚀刻技术测定硅结晶完整性的试验方法
【标准号】:ASTMF47-1994
【标准状态】:作废
【国别】:美国
【发布日期】:1994
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:刻蚀技术;硅;电子工程;处理;结晶;试验
【英文主题词】:etchtechniques;silicon;testing;treatment;crystallographic;electronicengineering
【摘要】:
【中国标准分类号】:H81
【国际标准分类号】:29_040_30
【页数】:
【正文语种】:英语