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摘要: )gSqO{Z @!'}=?` 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'$1$~I PZJ9f8V 背景: Y I;iG[T,& 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。 knYp"<qj 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。 i>,AnkI& 图1. RPC Photonics工程漫射体结构及光束投射形状 M-@X&bm,S rIJPgF r~h# 步骤 (DY[OIHI ^i Jyo&I 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{5GK' M /v@C*c 图2. RPC Photonics工程漫射体不同类型的散射数据 pvsa?z;rP 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) prN+{N8YC 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 fV5$[CL1 例如下所示: (g/A uL Sample name: EDF-C1-56 .kg 3>* Merging data from file EDF-C1-56 0-0.txt <7F-WR/2n Finished merging RPC data for sample EDF-C1-56 aK
-x{ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt B+U:=591 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 1n!:L!,` a. 创建一个新的散射库 '!`\!=j-` b. 散射模型命名 [bP^RY: c. 改变散射模型为“Tabulated BSDF”. T9w=k) d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) S<Gm*$[7 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。 <A8>To< 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, [. 9[?8 g. 点击OK mc8Q2eQat} 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 !pw)sO~ 'xj5R=V A2:}bb~H 脚本代码: O_a^|ln& jK]1X8 '#Language "WWB-COM" 3MNM<Ih 4xmJQ>/ Option Explicit j\~,Gtn>Z o4WQA"VxM Sub Main yiC7)= wCNn/%C 'Cleanup 2I }p X9 ClearOutputWindow() IJGw<cB]+ gtu<#h( Print "Merging RPC Photonics BSDF Data Files" ~>u|7M$( SetTextColor(255,0,0) ,GYQ,9: Print "Note: Script should be located in the same folder as the BSDF TXT files." . waw=C Print "Note: Do not run this script multiple times without deleting the output file between executions." s __xBY SetTextColor(0,0,0) v
f{{z%3T zG6l8%q'UE 'Current directory of this script (should be the same as the text files being merged) bc'IoD/ Dim cDir As String I@ueeDY cDir = MacroDir$ & "\" {sC Ni G5/A{1sz& 'Array which will be populated with the list of files to be merged /ki-Tha Dim fList() As String, curFile As String MmjZq GetFileList( cDir, fList ) ^BA%]pe$I y'!OA+ob Print "" w/m@(EBK Print "Files found for merging:" jjj<B'zt For Each curFile In fList Q*>)W{H&) Print Chr(9) & curFile ?<!qF:r: Next -t|/g5.w_ 3Xu|hkK\e 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ;F"!$Z/ Dim nameArray() As String, sampName As String Cj8&wz}ez nameArray = Split(fList(0)," 0-0.txt") ewk7:zS/? sampName = nameArray(0) I!Z`'1" Print "" T(*,nJi~9 Print "Sample name: " & Chr(9) & sampName -/JEKwc 05FGfnq.8 'Open an output file and write the FRED header data /"g Ryv Dim outFile As String xyGwYv>*KO outFile = cDir & sampName & "_FRED.txt" Th9V8Rg+E Open outFile For Output As #1 W|>jj$/o Print #1, "type bsdf_data" XY'8oU`]{ Print #1, "format angles=deg bsdf=value scale=1" bzNnEH`^] Z2$_9. 'Loop the file list, skip the two header lines and write the remaining data to file <x^$Fu Dim lineArray() As String, curLine As Long fI)XV7,X For Each curFile In fList 3s!6rT_=)d Print "Merging data from file " & curFile 1PwtzH.w ReadFile( cDir & curFile, lineArray ) dw <i)P^
For curLine = 2 To UBound(lineArray) s0?'mC+p Print #1, lineArray(curLine) DPzW,aIgv Next 4@-tT;$ Next )-3~^Y#r_ :.*Q@X}-I 'Close the output file 7y|U!r"Y Close #1 p2gdAJ 9<_hb1' Print "Finished merging RPC data for sample " & sampName 03fOm Print "FRED formatted data file: " & Chr(9) & outFile dP8qP_77A~ End Sub kzZgNv#G; PK:Lv15"r 'Utility function to read the contents of a file into an array of strings. lz0-5z+\ Function ReadFile(ByVal fileName As String, _ Zmyq6.1q~ ByRef lineArray() As String) As Long =Q_1Mr4O ':4<[Vk ReadFile = -1 :b44LXKCP Dim oFSO As Object `nyz, Set oFSO = CreateObject("Scripting.FileSystemObject") f 3H uT=n Erase lineArray >`x|E-X" 7p.8{zQ* Dim fid As Long Z?o0Q\}1 If oFSO.fileexists( fileName ) Then Qf=^CQ=lV fid = FreeFile() yQrgOdo,w Open fileName For Input As fid DS(>R!bb lineArray = Split(Input(LOF(fid), fid), vbCrLf) _R\FB|_ Close fid fS4foMI63) End If K]m#~J3d> Set oFSO = Nothing -w"I Return UBound( lineArray ) &s`)_P[ FvT4?7- End Function Dr.eos4 ~ @o0HDS Sub GetFileList( ByVal in_dir As String, _ uBww ByRef in_flist() As String ) jv~#'=T' ExO#V9DaW 'Redimension the file list array |-=-/u1 Erase in_flist t`JT PL=v,NB 'Tracks how many files are found ^`yhN Dim fCount As Long bDvGFSAH fCount = 0 U^7hw(}me yT/rH- j;5 'Recurse directory and search for text files EcHZmf Dim f As String rd->@s|4mT f = Dir$(in_dir & "*.txt") KJT N"hF While f <> "" uY~mi9E ReDim Preserve in_flist(fCount) K7&]|^M9 in_flist(fCount) = f fh =R fCount += 1 {Ycgq%1>] f = Dir$() tQzbYzGb7 Wend #eKKH]J/ ReDim Preserve in_flist(fCount-1) MlWKfe< OG<*&V End Sub jj&G[-"bv rwDLBpk bnfeZR1m_ QQ:2987619807 %@:>hQ2;
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