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摘要: @x9a?L.48 \ ,7f6: 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。 N8!cO[3Oh __`*dL>* 背景: RSr
%n1 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。 stG~AC 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。 _9faBrzd 图1. RPC Photonics工程漫射体结构及光束投射形状 YCdS!&^UN _]04lGx27 /|r^W\DV&x 步骤 /d0K7F \qR7mI/* 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。 d{rQzia"mV guX
9} 图2. RPC Photonics工程漫射体不同类型的散射数据 7q?9Tj3 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) A:>01ZJ5S+ 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 kv8Fko 例如下所示: 4A@NxihH Sample name: EDF-C1-56 So{x]x:f Merging data from file EDF-C1-56 0-0.txt m*ISa(#(, Finished merging RPC data for sample EDF-C1-56 >C7r:% FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt @_U;9) 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 @'YS1 N< a. 创建一个新的散射库 n/DP>U$I& b. 散射模型命名 m/v9!'cMI c. 改变散射模型为“Tabulated BSDF”. eKgisY4# d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) /rg*p e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 if}-_E<F f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, SLO%7%>p g. 点击OK q:l>O5 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 )_1zRT| 9 =6woWlf b :Mb%A 脚本代码: L~_9_9c 4/mig0"N. '#Language "WWB-COM" cS>e? q/4YS0CqE Option Explicit n_$
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.x9 Sub Main 'I_Qb$ y(Y!?X I 'Cleanup z."a.>fPaO ClearOutputWindow() 6Pnk5ps }h 0.dgoq3u Print "Merging RPC Photonics BSDF Data Files" LAVAFlK5 SetTextColor(255,0,0) wm]^3qI2 Print "Note: Script should be located in the same folder as the BSDF TXT files." W`K7 QWV4 Print "Note: Do not run this script multiple times without deleting the output file between executions." #~SP)Ukp SetTextColor(0,0,0) ${+ @gJ+S _Xn qb+ 'Current directory of this script (should be the same as the text files being merged) Xua+cVc\y Dim cDir As String ^
s1Q*He cDir = MacroDir$ & "\" TftHwe):V T;@;R% 'Array which will be populated with the list of files to be merged K/A*<<r
~ Dim fList() As String, curFile As String $}lbT15a GetFileList( cDir, fList ) N5* u]j hZh9uI7. Print "" C3< m7h Print "Files found for merging:" fNb`X For Each curFile In fList R16'?, Print Chr(9) & curFile hc~s"Atck Next CF+_/s#j^ SGh1 DB 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ) _mr! z(S Dim nameArray() As String, sampName As String ,stN nameArray = Split(fList(0)," 0-0.txt") )E6;-rD0^+ sampName = nameArray(0) B+[A]dgS Print "" \zieyE Print "Sample name: " & Chr(9) & sampName RRmLd/( @kk4]:,w 'Open an output file and write the FRED header data L !=4N!j Dim outFile As String QA2borfy outFile = cDir & sampName & "_FRED.txt" Sl-v W Open outFile For Output As #1 '&.# Print #1, "type bsdf_data" ._8KsuJG Print #1, "format angles=deg bsdf=value scale=1" 0TN;86Mo (7XCA,KTGI 'Loop the file list, skip the two header lines and write the remaining data to file '3TW [!m Dim lineArray() As String, curLine As Long Swp;HW7x For Each curFile In fList 6T+FH;h
Print "Merging data from file " & curFile 'a$Gv&fu ReadFile( cDir & curFile, lineArray ) e?_@aa9~@{ For curLine = 2 To UBound(lineArray) .u:81I=w( Print #1, lineArray(curLine) "`M?R;DH Next :!5IW?2 Next M&NB/ Q2zjZC*'% 'Close the output file ?shIj;c[ Close #1 w=j I4i2+
*l} Print "Finished merging RPC data for sample " & sampName _@
*+~9%8p Print "FRED formatted data file: " & Chr(9) & outFile ;3\3q1oX End Sub u}!@ ,/) xEf'Bmebk 'Utility function to read the contents of a file into an array of strings. ##@$|6 Function ReadFile(ByVal fileName As String, _ COTp ByRef lineArray() As String) As Long y]J89
{Zh>mHW3 ReadFile = -1 K$ M^gh0 Dim oFSO As Object kqce[hgs< Set oFSO = CreateObject("Scripting.FileSystemObject") qHNE8\9 Erase lineArray w"OP8KA:^T pY_s*0_ Dim fid As Long e*bH0'; q If oFSO.fileexists( fileName ) Then Kw8u`$Ad7 fid = FreeFile() Vs%|pIV Open fileName For Input As fid fO0(Z lineArray = Split(Input(LOF(fid), fid), vbCrLf) Q3|T':l4 Close fid }?z@rt^ End If qZ}P*+`Q Set oFSO = Nothing Gm9hYhC8 Return UBound( lineArray ) 1Ab>4UhD OiE;B End Function -RS7h n|b5? 3 Sub GetFileList( ByVal in_dir As String, _ z)z{3rR|PW ByRef in_flist() As String ) 5B&;uY F)+{AQL 'Redimension the file list array :um|nRwy9 Erase in_flist rS4@1`/R 2RN)<\ P 'Tracks how many files are found wjh=Q Dim fCount As Long >.'<J] fCount = 0 Qu}W/j|3 &}?$i7x5 'Recurse directory and search for text files 2gzou|Y Dim f As String M/):e$S f = Dir$(in_dir & "*.txt") ep=qf/vd< While f <> "" 34wkzu ReDim Preserve in_flist(fCount) ={5#fgK> in_flist(fCount) = f rAs,X fCount += 1 ;=<-5;rI f = Dir$() UTf9S>HS Wend "Kc>dJ@W ReDim Preserve in_flist(fCount-1) RjWqGr;bO G!Um,U/g End Sub es>W$QKlo 05snuNt]- ~BDu$ QQ:2987619807 Mz1G5xcl
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