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摘要: b'O/u."O }hn?4ny 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。 (Nzh1ul\} #?Ix6 {R 背景: 1feVFRx' 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。 Aw7N'0K9UN 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。 Ox)<"8M 图1. RPC Photonics工程漫射体结构及光束投射形状 M&iXdw& YMo8C( %R5- 6 步骤 T$kuv`? TFHYB9vV 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。 BD"Dzq X}GX6qAdt 图2. RPC Photonics工程漫射体不同类型的散射数据 4l0>['K&{ 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) e\}@w1 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 Af\@J6viF7 例如下所示: 5B%KiE&p Sample name: EDF-C1-56 Lum=5zDo Merging data from file EDF-C1-56 0-0.txt p4uzw Finished merging RPC data for sample EDF-C1-56 \>\ERVEd FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt :"y2u 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 c6jVx_tt. a. 创建一个新的散射库 CL7_3^2qI b. 散射模型命名 /Igz[P^\9 c. 改变散射模型为“Tabulated BSDF”. ?jmL4V2-f 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 ) 2a-]TVL3 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。 0=+feB1T 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, }>iNT.Lvd g. 点击OK 1#L%Q(G 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 iklZ[G%A0 $mT)<N ;w sC"w{_D@*4 脚本代码: \E c*Gq?. ,]t_9B QK '#Language "WWB-COM" LmY[{.'tX bRggt6$z Option Explicit E\}A<r W2`3PEa Sub Main E;H9]*x/ md bi@ms@ 'Cleanup 3ylSO73R ClearOutputWindow() :/gHqEC24 SP<(24zdd Print "Merging RPC Photonics BSDF Data Files" i\uj>;B SetTextColor(255,0,0) V}`ri~ Print "Note: Script should be located in the same folder as the BSDF TXT files." GsO(\hR6^ Print "Note: Do not run this script multiple times without deleting the output file between executions." I@qGDKz; SetTextColor(0,0,0) qQfNT. ,+d8
'Current directory of this script (should be the same as the text files being merged) J>M 9t%f@ Dim cDir As String [zl4"|_` cDir = MacroDir$ & "\" 83]m/Iz "C3J[) qC 'Array which will be populated with the list of files to be merged
ld"rL6 Dim fList() As String, curFile As String e2fv% GetFileList( cDir, fList ) "([gN: d %FLk=] Print "" 3zmbx~| =\ Print "Files found for merging:" +P9eE,WR For Each curFile In fList *"OlO}o Print Chr(9) & curFile VL5VYv=: Next eU)QoVt JPL`/WA0 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ?c8(<_I+ Dim nameArray() As String, sampName As String )zy;! nameArray = Split(fList(0)," 0-0.txt") Xhyn! &H5 sampName = nameArray(0) #%%!r$UL Print "" Af@\g-<W_ Print "Sample name: " & Chr(9) & sampName Z{t `f[ TC2%n\GH* 'Open an output file and write the FRED header data 0s Jp,4Vv Dim outFile As String p,f$9t4 outFile = cDir & sampName & "_FRED.txt" :
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Open outFile For Output As #1 ukVBC"Ny Print #1, "type bsdf_data" Xk'Pc0@a Print #1, "format angles=deg bsdf=value scale=1" `<P:ly. _Wk*h}x 'Loop the file list, skip the two header lines and write the remaining data to file -ON-0L Dim lineArray() As String, curLine As Long 86cnEj= For Each curFile In fList QrFKjmD< Print "Merging data from file " & curFile R'vNJDFY ReadFile( cDir & curFile, lineArray ) R-<8j`[0 For curLine = 2 To UBound(lineArray) 1he5Zevm} Print #1, lineArray(curLine) KiFTj$w, Next G=Lg5`3;, Next _E8Cvaob }/\`'LQ 'Close the output file d@$bPQQ$, Close #1 +Q"~2_q5/; h-O;5.m-P Print "Finished merging RPC data for sample " & sampName !Ea9
fe Print "FRED formatted data file: " & Chr(9) & outFile O#):*II`9 End Sub *_J{_7pwe a[z$ae7 'Utility function to read the contents of a file into an array of strings. 3b#L*- Function ReadFile(ByVal fileName As String, _ aO(iKlZ$ ByRef lineArray() As String) As Long 2"shB(:z> &tf(vU;,' ReadFile = -1 /s+IstW Dim oFSO As Object L^Q;M,.c; Set oFSO = CreateObject("Scripting.FileSystemObject") PJ?C[+& Erase lineArray 5`:d$rv X<$DNRN Dim fid As Long Bxw(pACf If oFSO.fileexists( fileName ) Then yZm=#.f fid = FreeFile() SYf1dbc..u Open fileName For Input As fid ~#P]NWW%. lineArray = Split(Input(LOF(fid), fid), vbCrLf) OAiv3"p Close fid gs/o cu End If .p o,.} Set oFSO = Nothing G3]#Du Return UBound( lineArray ) X6(s][Wn ":s_O. End Function l1O"hd'~s }a9G,@:k Sub GetFileList( ByVal in_dir As String, _ djw\%00 ByRef in_flist() As String ) >mR8@kob< L@zhbWY 'Redimension the file list array ,d* hhe
Erase in_flist 3Z me?o*bY *TI?tD 'Tracks how many files are found #,6T. O Dim fCount As Long hOj+z? fCount = 0 XpE847!soL Ks6\lpr 'Recurse directory and search for text files dVHbIx Dim f As String s0D4K f = Dir$(in_dir & "*.txt") ?YS 3) While f <> "" g*LD}`X/- ReDim Preserve in_flist(fCount) YOrq)_ l in_flist(fCount) = f '6>*J fCount += 1 G-RDQ f = Dir$() NW 2`)e' Wend z,^~H ReDim Preserve in_flist(fCount-1) hh%?E\qM *W^ZXhrZ End Sub uZJfIC<> 6'@ {
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