传感器数量对应力波检测原木内部缺陷精度的影响_英文_

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1、JournalofForestryResearch,18(3):221−225(2007)221DOI:10.1007/s11676-007-0045-5EffectofsensorquantityonmeasurementaccuracyofloginnerdefectsbyusingstresswaveWANGLi-hai,XUHua-dong,ZHOUCi-lin,LILi,YANGXue-chunNortheastForestryUniversity,Harbin150040,P.R.Chi

2、naAbstract:Woodnondestructivetesting(NDT)isoneofthehighefficientmethodsinutilizingwood.Thispaperexplainedtheprincipleoflogdefecttestingbyusingstresswave,andanalyzedtheeffectsofsensorquantityondefecttestingresultsbyusingstresswaveintermsofimagefittingde

3、greeanderrorrate.Theresultsshowedthatforlogswithdiameterrangingfrom20to40cm,atleast12sensorswereneededtomeettherequirementwhichensureahightestingaccuracyofroughly90%offitnesswith0.1oferrorrate.And10sensorswererecom-mendedtojudgethepossiblelocationsofde

4、fectsand6sensorsweresufficienttodecidewhetherthereweredefectsornot.Keywords:Sensorquantity;Logdefecttesting;Stresswave;Imagefittingdegreenology,stresswavetechnologyiswidelyusedinfieldsofwoodindustryduetoitslowercostincomparisonwithothertechnolo-Introdu

5、ctiongiesincludingCTandx-rays,etc.Inrecentyears,stresswavetechnologyhasbeenusedtotestwooddefectwithstresswaveQualityassessmentanddefectsdetectionofwoodshadtheim-sensorssimultaneously(Wangetal.2002).Thispaperstudiedportanteffectsonforestryindustry.Nonde

6、structiveevaluationontheeffectsofsensorquantityonthefitnessanderroroftestingthepropertiesoflogsisnecessarytosolvepracticalproblemsimagesbyusingstresswave.withoutthedestructionoftheintegrityoftrees(Yangetal.2005b).Theearliestmethodwastotakeanincrementco

7、refromPrincipleoflogdefecttestingbyusingstresswavethetrees,whichwasconsiderednondestructiveforitslifeandtodevelopdifferentnondestructivetechniquesforstudyingmainThegeneralprincipleisthatasensorisflippedtoproduceaphysicalcharacteristicsoftrees.Researche

8、rshaveusedanumberoftechniquestoinvestigatestresswavepropagatedinwoodandreceivedbyothersensors.thedetectionofdefectsinwood.Connersetal.(1983)usedaThetimeintervalintheprocessisrecordedtocalculatethethresholdingtechniquetolocatesurfacedefe