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上海长方光学仪器有限公司

不同接触角仪软件Young-Laplace方程拟合接触角对比

来源:内容来源于网络 浏览量:2053次
【导读】本视频中演示了采用Young-Laplace方程拟合时各家接触角仪公司软件的区别。从测试结果来看,接触角变化范围从103-105度之间,属于一个合理的变化范围。这种变化由各种因素造...

本视频中演示了采用Young-Laplace方程拟合时各家接触角仪公司软件的区别。从测试结果来看,接触角变化范围从103-105度之间,属于一个合理的变化范围。这种变化由各种因素造成,如水的挥发等。

 

 

另可参考如下资料,我们发现国外的部分生产厂的接触角仪软件使用Young-Laplace拟合时,90-140度时,测值偏大5度,而大于140度时,测值偏大约10度。

Wemeasuredcontactangleofsamesamplewith4differentsoftwarefromKruss,Dataphysics,BiolinandKINO.AndwemeasuredcontactangleofsamplebyBiolin'ssofware-OneAttensionV2.4atfirstbecauseonlythissoftwarecannotimportimagesintosoftwareandcalculatecontactangleforimportedimage.OthersofwaressuchasDSA1.92andDSA3.0fromKruss,andSCA202fromDataphysicsandCAST3.0fromKINOcanallimportimageintosoftwareandcancalculatecontactangleusingdifferentmethodsuchascirclefittingmethod,ellispefittingmethodandYoung-Laplaceequationfittingmethod.

Atthisarticle,wejustshowyouthecalculatedresultbydifferentcompany'ssoftware.Comparisonofmeasuredresultmaybehassomeexisteddeviationduetoourmisoperation.Youcancontactustoobtaintherecordedvideoformeasuringprocessofcontactangle.

Andfromthecomparisonofmeasuredcontactanglefromdifferentdropshapesoftware,maysafelydrawaconclusionthat:

1,Whencontactanglebelow3°: anti-dazz领screenmustbeusedtogetsharpdropshapeandwhenusingYoung-Laplaceequationfittingmethod,onlysofwarefromBiolin(OneAttensionV2.4)isfailuretofittingthedropshapeandgetaacceptablecontactangle.

2,Whenthereexistssomenoisepointsorpoorbackgroud,tangentmethodbasedonpartsofdropprofilewill  failuretofittingthedropshapeandgetaacceptablecontactangle.

3,Whencontactanglebetween90°-140°,calculatedcontactanglebasedonYoung-LaplaceequationfittingmethodfromdropshapeanalysissoftwarefromKruss,DataphysicsandBiolinwillbelargerthanothermehodsuchascirclefittingandellispefittingabout3-5° whencirclefittingorellispefittingcanfittingthedropshape.And alsothisvaluebasedonYoung-LaplaceequationfittingmethodislargerthanADSA-RealDropbasedmethodfromKINOabout3-5°.

4,Whencontactanglelargerthan140°,  calculatedcontactanglebasedonYoung-LaplaceequationfittingmethodfromdropshapeanalysissoftwarefromKruss,DataphysicsandBiolinwillbelargerthanothermehodsuchascirclefittingandellispefittingabout8-10° whencirclefittingorellispefittingcanfittingthedropshape.And alsothisvaluebasedonYoung-LaplaceequationfittingmethodislargerthanADSA-RealDropbasedmethodfromKINOabout8-10°.

5,CalculatedontactanglesbydifferentmethodfromKINO'ssofwareCAST3.0are almostkeptsamewhenbothofthemfittingdropshapecorrectly.

 Pleasebenotedthat,

1, Abasicprincipleiscontactangleiscalculatedfromtangentatcontactpointorcurveradiusatcontactpoint.Andwhenfittingdropprofilewithsomeequationofcurve,ifresultoffittingisgood,calculatedcontactanglewillbealmostsame.Inotherwords,Young-Laplaceequationcanbeusedtocalculatecontactanglewhendropshapecannotfittingwithcircleequationduetoeffectofgravity.Butifweusedotherequationofcurveandfittingitcorrectly,theresultwillbekeptalmostsame.

2,Rednumbermeansitisfailuretofittingdropprofilewithcurrentmethod.And"—"meanscurrentmethodcannotcalculateanyresultautomatically.  


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2004-07-29 09:50:22
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