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摘要: .:-*89c 0>,i]
|Y RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 Xk^<}Ep)c o/U}G,|G 背景: ][f 0ZMa Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 c3fd6Je5 FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ~HctXe' x 图1. RPC Photonics工程漫射体结构及光束投射形状 x!4<ff. I/h( *~/ K/& 步骤 *{fZA;<R ]<},[s 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 jJ>I*'w kaZcYuT.9 图2. RPC Photonics工程漫射体不同类型的散射数据 @C'qbO{ 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) X?8bb! g%Q 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ^]LWcJ?"^! 例如下所示: dDe$<g5L4 Sample name: EDF-C1-56 R<T5lkJ\/ Merging data from file EDF-C1-56 0-0.txt B)DtJf Finished merging RPC data for sample EDF-C1-56 Or1ikI" FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt kDKfJp&a 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 NS4W!o;" a. 创建一个新的散射库 5t-(MY b. 散射模型命名 %e:
hVU c. 改变散射模型为“Tabulated BSDF”. P\X$fD d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) G!GGT?J e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 o`jV d,aj f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, YZ0Q?7l7 g. 点击OK P; =,Q$e8 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 :JxuaM8 A*{V%7hs& (Sj?BZjC 脚本代码: EU7mP
MxJ U_0"1+jbq '#Language "WWB-COM" ~RM_c :EC[YAK+D Option Explicit ][Cg8 j&?@:Zg v Sub Main w##$SaTI ~<_PjV 'Cleanup |A
u+^#:; ClearOutputWindow() @}e5T/{X}T L6pw'1' Print "Merging RPC Photonics BSDF Data Files" DTV"~>@ SetTextColor(255,0,0) $Jy1=/W& Print "Note: Script should be located in the same folder as the BSDF TXT files." vP&JL~ Print "Note: Do not run this script multiple times without deleting the output file between executions." \g;-q9g;O SetTextColor(0,0,0) s4\_%je<v ~p/1
9/ 'Current directory of this script (should be the same as the text files being merged) n ^C"v6X
Dim cDir As String pL'+sW cDir = MacroDir$ & "\" [)p>pA2GZj >]8H@. \ 'Array which will be populated with the list of files to be merged 2G`tS=Un Dim fList() As String, curFile As String [RUYH5>Ik GetFileList( cDir, fList ) *p%=u>?& 6SD9lgF*- Print "" @X>Oj . Print "Files found for merging:" =I9RM9O< For Each curFile In fList *1b)Va8v* Print Chr(9) & curFile (ft$ R? Next |lf,3/*jDB ||kUi=5 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. dX~$#-Ad86 Dim nameArray() As String, sampName As String ~Wj.
4b* nameArray = Split(fList(0)," 0-0.txt") H(j983 sampName = nameArray(0) V> @+&q Print "" eB*0}) Print "Sample name: " & Chr(9) & sampName T|Fl$is f+W %X 'Open an output file and write the FRED header data Sy`7 })[ Dim outFile As String jG&gd<^ outFile = cDir & sampName & "_FRED.txt" (\NZ)Ys Open outFile For Output As #1 /jv4#9 Print #1, "type bsdf_data" qUtlh,4) Print #1, "format angles=deg bsdf=value scale=1" a{7'qmN1 q*4=sf,> 'Loop the file list, skip the two header lines and write the remaining data to file J9*$@&@S Dim lineArray() As String, curLine As Long >hmBV7nR For Each curFile In fList .:=G=v=1 Print "Merging data from file " & curFile $Q< >MB7 ReadFile( cDir & curFile, lineArray ) _"0Bg3Y For curLine = 2 To UBound(lineArray) <mdHca Print #1, lineArray(curLine) jUCrj' Next 1US4:6xX_ Next wm/=]*jpK /V@9! 'Close the output file
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t@] Close #1 S
7 *LV; m_g2Cep Print "Finished merging RPC data for sample " & sampName tjTnFP/= Print "FRED formatted data file: " & Chr(9) & outFile fC$(l@O? End Sub &`IC3O5 }grel5lq 'Utility function to read the contents of a file into an array of strings. 0B?t:XU , Function ReadFile(ByVal fileName As String, _ ;HbAk`\1A ByRef lineArray() As String) As Long ;XXB^, U}2b{ ReadFile = -1 {
vOr'j@ Dim oFSO As Object Tweku}D7 Set oFSO = CreateObject("Scripting.FileSystemObject") ruQ1Cph Erase lineArray j!<(` !O}^ Y Dim fid As Long w[X/|O If oFSO.fileexists( fileName ) Then %DR8M\d1~H fid = FreeFile() 2/m4| Open fileName For Input As fid #XPY\n^k lineArray = Split(Input(LOF(fid), fid), vbCrLf) cg]>*lH Close fid yTb#V"eR End If 6_wj,7 Set oFSO = Nothing -\V!f6Q Return UBound( lineArray ) 84}Pu% TKBW2 End Function hiQ #< Qaeg3f3F3 Sub GetFileList( ByVal in_dir As String, _ 7lH3)9G; ByRef in_flist() As String ) kMP3PS /pS Y ~* 'Redimension the file list array e;G}T%W Erase in_flist nqMXE82 1r LK1X 'Tracks how many files are found |`,AAa Dim fCount As Long +zf[Im%E fCount = 0 iu+r=sp (764-iv( 'Recurse directory and search for text files kt;uB
X3 Dim f As String iVe"iH f = Dir$(in_dir & "*.txt") %ot4$eY While f <> "" JRYCM}C] ReDim Preserve in_flist(fCount) P ")1_! in_flist(fCount) = f o/~Rf1 fCount += 1 l1I\khS f = Dir$() [;RO= Wend o;5 ns ReDim Preserve in_flist(fCount-1) \\UOpl gql^Inx< End Sub h1AZ+9
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