di--:h/ 摘要: 3;y_qwA 0~qf-x 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。 wZ$tJQO abL/Y23
" 背景: RZW$!tyI= 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。 |PI)A` 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。图1. RPC Photonics工程漫射体结构及光束投射形状 uC- A43utv F OeVRq:# sr;:Dvx~ ;*W=c 步骤 I88Zrhw m"<4\;GK 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。 Hw\([j* 图2. RPC Photonics工程漫射体不同类型的散射数据 <{E;s)hD? -MDOZz\ 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) ^p$1D 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 '!Hhd![\=| 例如下所示: 7AI3|Ts]p Sample name: EDF-C1-56 Ir!2^:]! Merging data from file EDF-C1-56 0-0.txt P`p6J8}4 Finished merging RPC data for sample EDF-C1-56 %)8d{1at FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt m dC`W&r 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 `'*F1F a. 创建一个新的散射库 ax<g0=^R b. 散射模型命名 }iD$4\ L c. 改变散射模型为“Tabulated BSDF”. M8\G>0Hc6 d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) yQ8M >H#J e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 "EN98^
Sl f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, 3b+7^0frY# g. 点击OK 4g>1Gqv6 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 &}>|5>cJu /.7$`d ~l(G6/R 脚本代码: |^Y*~d<H Y_$^:LG '#Language "WWB-COM" y>@v>S r4 9UJE Option Explicit h0T< :X 2IKxh Sub Main *Hxj_ uFGv%W 'Cleanup B"7$!C o ClearOutputWindow() /
c+, ;>inT7?3| Print "Merging RPC Photonics BSDF Data Files" ^?E^']H)5u SetTextColor(255,0,0) -zPm{a Print "Note: Script should be located in the same folder as the BSDF TXT files." BXT80a\ Print "Note: Do not run this script multiple times without deleting the output file between executions." c zZrP" SetTextColor(0,0,0) 01&*`0? )WaX2uDA? 'Current directory of this script (should be the same as the text files being merged) qRgK_/[] Dim cDir As String [Xs}FJ cDir = MacroDir$ & "\" R"m.&%n U#8\#jo 'Array which will be populated with the list of files to be merged dD[v=Z_ Dim fList() As String, curFile As String uOyLC<I/ GetFileList( cDir, fList ) )EhTM-1 h{Oz*Bq Print "" K.:6YXVs< Print "Files found for merging:" p3V9ikyy For Each curFile In fList +<'uw Print Chr(9) & curFile
g|tNa/ Next !JT<(I2 )fxo)GS 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. M/n[& Dim nameArray() As String, sampName As String Hi9 G^Q nameArray = Split(fList(0)," 0-0.txt") B(S5+Y sampName = nameArray(0) sqm%iyC=q Print "" /uy&2l Print "Sample name: " & Chr(9) & sampName vN{vJlpY w:m'uB%W 'Open an output file and write the FRED header data N2[, aU Dim outFile As String +}Qv6s# outFile = cDir & sampName & "_FRED.txt" F7k4C2r Open outFile For Output As #1 .a 'ETNY:> Print #1, "type bsdf_data" i;E9ZaW Print #1, "format angles=deg bsdf=value scale=1" @/_XS4 x(C]O, 'Loop the file list, skip the two header lines and write the remaining data to file X !&"&n Dim lineArray() As String, curLine As Long )OARO For Each curFile In fList / e~ Print "Merging data from file " & curFile e1f^:C ReadFile( cDir & curFile, lineArray ) RM?_15m For curLine = 2 To UBound(lineArray) !1ie:z>s Print #1, lineArray(curLine) tEi@p;Z> Next !mw{T D Next 1G e)p4 =2ATqb"$w 'Close the output file S+` !%hJ Close #1 >i><s>=I` !nP8ysB Print "Finished merging RPC data for sample " & sampName asm[-IB2u Print "FRED formatted data file: " & Chr(9) & outFile UiGUaB mF* End Sub htdn$kqG
-~rr<D\ 'Utility function to read the contents of a file into an array of strings. sqq/b9 uL/ Function ReadFile(ByVal fileName As String, _ kMwIuy ByRef lineArray() As String) As Long :kf3_?9rc j8D$/ ReadFile = -1 73!
x@Duh Dim oFSO As Object fzGZ :L Set oFSO = CreateObject("Scripting.FileSystemObject") L<[,7V Erase lineArray 0C9QAJa dpc=yXg>"c Dim fid As Long ^>P@5gcoE( If oFSO.fileexists( fileName ) Then ByB0>G''. fid = FreeFile() ,b2O^tJF# Open fileName For Input As fid O"2wV +9 lineArray = Split(Input(LOF(fid), fid), vbCrLf) W#JVU GYD Close fid %8z+R m,Ot End If 2WbZ>^:Nsk Set oFSO = Nothing he#Tr'j Return UBound( lineArray ) ~'PS| tyGnG0GK End Function 0X S' v,| I?:+~q}lZr Sub GetFileList( ByVal in_dir As String, _ hj#+8= ByRef in_flist() As String ) q) zu}m eBLHT 'Redimension the file list array \fQgiX Erase in_flist w
oY)G7% a*$1la'Uf 'Tracks how many files are found v J,xz*rc` Dim fCount As Long ZQ-z2s9U fCount = 0 +Fy-~Mq ZRVF{D??"% 'Recurse directory and search for text files Qbe{/ Dim f As String Z{R=h7P f = Dir$(in_dir & "*.txt") Ff1M~MhG While f <> "" cbg3bi ReDim Preserve in_flist(fCount) wTJMq`sY_ in_flist(fCount) = f `P)64So-1 fCount += 1 {F{[!. f = Dir$() .Q6{$Y%l Wend y(p:)Iv ReDim Preserve in_flist(fCount-1) |