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摘要: /s%-c!o^ I$S*elveG RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 4OLYB9HP_ 8RuW[T? 背景: shL_{} Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 88<d<)7t FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 `n-/~7 图1. RPC Photonics工程漫射体结构及光束投射形状 7[0Mr,^ ;7EeR M* a!4p$pR 步骤 3N!v"2!# -hfkF+=U' 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。 >);M\,1\I 8%?MRRK 图2. RPC Photonics工程漫射体不同类型的散射数据 &hI!0DixX 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) z>0$SBQ- 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 {S-M] LE 例如下所示: O(-6Zqk8Q Sample name: EDF-C1-56 YahW%mv`d Merging data from file EDF-C1-56 0-0.txt wj0_X;L Finished merging RPC data for sample EDF-C1-56 P.Cn[64a+@ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt gBWr)R 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ^~TE$i< a. 创建一个新的散射库 7LM&3mA< b. 散射模型命名 6vTnm4 c. 改变散射模型为“Tabulated BSDF”. eHKb`K7C. 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 ) LkK&<z 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。 q^6#.} 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, T*Ge67 g. 点击OK D+
.vg?8 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ki2`gLK uTz>I'f dblf,x 脚本代码: fuCt9Kjo< }X=c|]6i^ '#Language "WWB-COM" FqGMHM\J P*}aeu&lnD Option Explicit (E,[Ad,$ x./"SQ=R+ Sub Main 2!CL8hG5: VK,{Mu=.9 'Cleanup 9M 1DE ClearOutputWindow() Btr>ek T%Cj#J&L Print "Merging RPC Photonics BSDF Data Files" Z 5P4 H SetTextColor(255,0,0) (Uu5$q( Print "Note: Script should be located in the same folder as the BSDF TXT files." ]B~(yh Print "Note: Do not run this script multiple times without deleting the output file between executions." lt]&o0> SetTextColor(0,0,0) ^5?|Dj YSfJUB!I 'Current directory of this script (should be the same as the text files being merged) `(P71T Dim cDir As String 31#jLWY'0 cDir = MacroDir$ & "\" aMkuyqPf{ 7)2Q 'Array which will be populated with the list of files to be merged PQYJnx} Dim fList() As String, curFile As String 8r@GoG> GetFileList( cDir, fList ) hgDFhbHtd6 GiK,+M"d Print "" Qgf|obrEi6 Print "Files found for merging:" _/.VXW For Each curFile In fList {-]K!tWda Print Chr(9) & curFile iyUnxqP Next =;)=,+V~q 0jxXUWO 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. [TqX"@4NS Dim nameArray() As String, sampName As String "WXUz nameArray = Split(fList(0)," 0-0.txt") 4k<U5J sampName = nameArray(0) @;{ZnRv14 Print "" _F4=+dT| Print "Sample name: " & Chr(9) & sampName KiE'O{Y "fSaM&@[B 'Open an output file and write the FRED header data nG?Z* n Dim outFile As String ;<+Z}d/g9 outFile = cDir & sampName & "_FRED.txt" v/$<#2| Open outFile For Output As #1 Ytqx0 Print #1, "type bsdf_data" FLkZZ\ Print #1, "format angles=deg bsdf=value scale=1" \S?-[v*{ 0 A8G8^T 'Loop the file list, skip the two header lines and write the remaining data to file e85E+S% Dim lineArray() As String, curLine As Long meThjCC For Each curFile In fList %=s2>vv9 Print "Merging data from file " & curFile E0!0 uSg& ReadFile( cDir & curFile, lineArray ) XMxm2-%olP For curLine = 2 To UBound(lineArray) ^)| tf\4 Print #1, lineArray(curLine) 5*90t{# Next KRP6b:+4L Next ]1h9:PF Hxc>? 'Close the output file Gtvbm Close #1 h{jm 3(*vZ Print "Finished merging RPC data for sample " & sampName r9D
68*H Print "FRED formatted data file: " & Chr(9) & outFile @.G;dL.f{ End Sub ICG:4n(, ds{)p<LpT 'Utility function to read the contents of a file into an array of strings. C&EA@U5X^ Function ReadFile(ByVal fileName As String, _ rV-Xsf7Z ByRef lineArray() As String) As Long o##!S6:A bpDlFa ReadFile = -1 %_>8.7 Dim oFSO As Object Dv^M/z2&[ Set oFSO = CreateObject("Scripting.FileSystemObject") 4T){z^"
Erase lineArray tTt}=hQpgX yVpru8+eD Dim fid As Long Fd%JF#Hk If oFSO.fileexists( fileName ) Then "b)EH/s fid = FreeFile() d@Wze[M?0 Open fileName For Input As fid ;1r|Bx <5 lineArray = Split(Input(LOF(fid), fid), vbCrLf) *d 4A3| Close fid yi -0CHo End If lXVh`+X/l
Set oFSO = Nothing .`&k` Return UBound( lineArray ) I(/*pa?m{ =66'33l2 End Function \34:]NM iBKH\em/ Sub GetFileList( ByVal in_dir As String, _
C +Wa(K ByRef in_flist() As String ) idjk uB(6 L /N%ft]!T 'Redimension the file list array @ykl:K%ke Erase in_flist <(45(6fQ z6Nz)$!_i 'Tracks how many files are found $+U6c~^^ Dim fCount As Long {!1RlW fCount = 0 8rLhOA F&7^M0x\ O 'Recurse directory and search for text files ( De>k8 Dim f As String :=:m4UJb f = Dir$(in_dir & "*.txt") b4(,ls While f <> "" Q-yNw0V}F ReDim Preserve in_flist(fCount) n8z++T& in_flist(fCount) = f M'pIAm1p fCount += 1 ZT<VDcP{ f = Dir$() )E^Pn|H Wend ;B{oGy. ReDim Preserve in_flist(fCount-1) d@ ]N ;Qq7@(2y End Sub
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