像素法裂纹参数测量技术研究

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1、盟塑甄杰璧黧杰鲎焦矍塞!!!笾!攘螫本文赞对工程结构开裂谱旗的鬻求，运髑光溺力学原理为逐年阍迅速羧鼹起来麴图像处理薪技术，研究开发了～套“像索法”裂纹长度秘宽度参数测定鞠新纂绩。谂文前裳，参与蹇戏了由光攀镜头一ccD一豳像卡组成懿菲接触裂纹检测系统的襞转嬲幸譬。之蘑佟嚣独囊究成了裂绞长发与宽度计算计餐专用软件豹开发。英牵辫像缝联模块镪岔了滤波去嗓、二德纯、图像分=妻；l

2、、轮廓撵敬与纲优等予模块。参数计算块中，遐蠲数字散鞋耪关黎理进行像素标定萼裂纹长发麓像素搜索诗葵；进两用鼗像索源理解决了裂纹宽发测繁时整

3、像素分辨率不够的技术难患。在论文的藤阶段，设诗了实验窝中进行黪掰个屡次瓣考梭和梅定试验，并对应熙中必然遴翻的物藕光照瘦、爝像对挽发、浏鼗距离(妨鞭)釉焦距海改变，对试验样本测璧精度豹舰德俸懑了初步分搪，为勰方法昀迸一步宠蛰援骰了蠢价谯的王律罄曩囊。竣厝对避一步描震研究提潞了睡融的分柝与建议。论文提交的获方法舞鸯嚣接融秘快速蠡幼测鳖魏褥点，耩凌满足王穰要求，蒋gg在琥场弱危陵环境下的裂纹参数测量辩曩静特氇秘筑势。露戳预渊，黢过以产品忧为麟浆熬深囊开发(较{牛嚣掰、祷聩显示、摄街打帮秘娆稠挺舞骥俦攒檬簿)矮，

4、弗辅以受多麴实验考核，究垒脊萄戆制律成一稀新掇的仪器，在众多Z稷硷镶8领域椎广废鲻。关键调：裂纹参数，非接触渊餐，CCD，数字图像处蠼，受缘索，像素椽定煎裳鋈塞鲎要麦鲎璧堕塞!!!篓!ABSTRAC蕈AccordingtOtheneedinevaluationofthecrackinstructure，theauthorofthispaperdevelopedanewsystembasedbfphotoelasticmechanicsanddigitalimageproooessl‘ng，whichiss

5、pecialyusedtomeasurethelengthandwidthof，crack。Inthe】prophasetheauthorpaticpatedthemadingofthehardwareofthesystemmadeofoptiallens、CCD、imagecardandcomput6er．Thellthesoftwarewhichcomposedthefilteringofnoise．theproductofb—inaryimage，imagesegmentation，edgedete

6、ctor，andthinningisfinished。Alsotheimageelementiscalibratedaccoringtothedigitalspeckleeorrelationmethod(DSCM)。Andthenthelengthdividedbytheinteralpixelishuntedandcacutated，thewidthdividedbysubpixelisatsodone．Finalymanyexperimentsare·completedinthelabindiffr

7、ientconditions，whiehcontainsitlaminanoeofcrack、contrastofimage、diStanceofShottingandfocallength，torevJewtheaccuracyofthenewsyst‘emand“toanalysthe—ruleoftheffectionoftheaccuracy。Thissystemcannon-contactingandfastmeasure，andthemeasuringaccuracysatisfiedthed

8、emandofengineering⋯Itshowsitsdominanceandc是ar8cteristiewhenitisuseEomeasurethecrackwhichisindangerousorhightemperaturefield⋯Itcanbeforecastedthat’thissystemcanbemadeE。oanewequipmentappliedinthefieldofdetectionwidespreadly，whenthesystemisimproved；Keywords：

9、theparameterofcrack，non--contactmeasurement，CCD}digitalimageproccessing，sub—pixel，thecalibrationofimageelement4一_h≤第～章概述§1。1裂纹参数测壑新技术开发的意义工程中鲍材料鸟槐件中都不霹遴兔她存在麓缺陷秘裂纹，在过载、羧赘交黛、涤震变纯、焊接器重鬣靛渗入、夯厦溢饿等麓豢终躅攀，黪会爱囊缺麓裂纹麴扩展，轻着豫低它们