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摘要: <=0_[M L5>>gG, 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。 $[z*MQ No[>1]ds 背景: d29]R. Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 2Ay2
G- FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 q'W`t>2T 图1. RPC Photonics工程漫射体结构及光束投射形状 Y#Hf\8r,d F[J;u/Z mxXQBmW 步骤 f'}23\> (5atU |8r 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 G;tIhq[$Vb DB?[h<^m 图2. RPC Photonics工程漫射体不同类型的散射数据 n9)/(=)>* 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) WJ
mj|$D 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ;KnnAZJ 例如下所示: }F^c*xt[ Sample name: EDF-C1-56 `B^?Za,xN Merging data from file EDF-C1-56 0-0.txt xOS4J+' s@ Finished merging RPC data for sample EDF-C1-56 Ex~OT FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt oW-luC+ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 b|4h2iuM a. 创建一个新的散射库 NjMo"1d b. 散射模型命名 d,$[633It} c. 改变散射模型为“Tabulated BSDF”. (=7e~'DC 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 ) BB~Qs 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。 /Cwt4.5 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, >WDb89kC= g. 点击OK 9=h A#t.# 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 z<)?8tAgq 5<&<61[A f^ nogw<z! 脚本代码: >YLwWU<X lPx4I '#Language "WWB-COM" YKj7~yK? ]x~H"<V Option Explicit |3vQmd !2} <~f/T]E, Sub Main YsDn?p D@ ][D<J0 'Cleanup y|c]r!A ClearOutputWindow() /SZsXaC ' tV%M2DxS Print "Merging RPC Photonics BSDF Data Files" rjfQ\W;}U SetTextColor(255,0,0) y_\vXY' Print "Note: Script should be located in the same folder as the BSDF TXT files." x"*u98&3 Print "Note: Do not run this script multiple times without deleting the output file between executions." E@t^IGDr SetTextColor(0,0,0) -<qci3Ba} Kh3*\x T 'Current directory of this script (should be the same as the text files being merged) *p +%&z_< Dim cDir As String :h?Zg(l cDir = MacroDir$ & "\" ,p0R4gi 1P&c:n 'Array which will be populated with the list of files to be merged .LdLm991,Y Dim fList() As String, curFile As String YQ2ie>C8 GetFileList( cDir, fList ) YpXUYNy 4km=KOx[ Print "" dxxD%lHCF Print "Files found for merging:" lshO'I+)* For Each curFile In fList ^-mz!{
Print Chr(9) & curFile Trm)7B* Next 5,;{<\c X,^J3Ek>O 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. mG\,T3/* Dim nameArray() As String, sampName As String ^D"}OQoh nameArray = Split(fList(0)," 0-0.txt") iC$~v#2 sampName = nameArray(0) J?u",a]|H" Print "" Hz!+g'R!Gs Print "Sample name: " & Chr(9) & sampName %<:?{<~wH9 mI"`. 'Open an output file and write the FRED header data NC|&7qQ Dim outFile As String ,??xW{*| outFile = cDir & sampName & "_FRED.txt" {WT"\Xj>B? Open outFile For Output As #1 ]g!k'@ Print #1, "type bsdf_data" ^o65sM Print #1, "format angles=deg bsdf=value scale=1" hP,SvN#!2 v~uQ_ae$> 'Loop the file list, skip the two header lines and write the remaining data to file 2r<UYB Dim lineArray() As String, curLine As Long @\b*a]CV For Each curFile In fList hekAics6S Print "Merging data from file " & curFile _~fO8_vr ReadFile( cDir & curFile, lineArray ) {PWz:\oaD For curLine = 2 To UBound(lineArray) 'R99kL/.N Print #1, lineArray(curLine) !G Z2|~f9 Next kfM}j Next :/K 'P`JaL fw'$HV76 'Close the output file &}wKC:LSP Close #1 i=]IUjx< ^s_E |~U Print "Finished merging RPC data for sample " & sampName C<eeAWP3v Print "FRED formatted data file: " & Chr(9) & outFile 0q>f x End Sub k-Le)8+b s=u0M;A0Q 'Utility function to read the contents of a file into an array of strings. !634 8nU: Function ReadFile(ByVal fileName As String, _ ?20y6c < ByRef lineArray() As String) As Long [p_R?2uT X_!Sm ReadFile = -1 wwmMpK}f Dim oFSO As Object Y[X5S{H`wj Set oFSO = CreateObject("Scripting.FileSystemObject") 0+m"eGwTm Erase lineArray 9Or3X/:o KSc&6UVz^ Dim fid As Long {M$mrmG If oFSO.fileexists( fileName ) Then >/ECLP fid = FreeFile() w[n|Sauy, Open fileName For Input As fid HRC5z<k% lineArray = Split(Input(LOF(fid), fid), vbCrLf) +g@@|&B Close fid VABrw t End If XK{`x< Set oFSO = Nothing !c\s)&U7B Return UBound( lineArray ) KAO}*? Qf$0^$ " End Function j}X4#{jgC {uDL"~^\ Sub GetFileList( ByVal in_dir As String, _ [yf2_{*0T ByRef in_flist() As String ) _|g(BK2} \"<&8 'Redimension the file list array \V +$2
:A Erase in_flist 4;7<)&#h k'xnl"q 'Tracks how many files are found (uD(,3/Cw Dim fCount As Long -$.$6"] fCount = 0 7"Zr:|$U Fx/9T2%= 'Recurse directory and search for text files 6jO*rseC Dim f As String LGgEq- f = Dir$(in_dir & "*.txt") \@:pWe While f <> "" Z8}Zhe. ReDim Preserve in_flist(fCount) 7?]gUrE in_flist(fCount) = f Mw\/gm_3 fCount += 1 m32OE`s f = Dir$() KQNSYI7a Wend YL;ZZ2A ReDim Preserve in_flist(fCount-1) }^pnwo9vV ;KbnaUAS8 End Sub fFqK.^Tn k&n7_[]n k(3s^B QQ:2987619807 bsR^H5O@
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