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摘要: yTNHM_P i[wnG ) 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。 b?<@ of > 背景: ZkdSgc') 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。 NC YOY 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。 fo<nk|i 图1. RPC Photonics工程漫射体结构及光束投射形状 e&K7n@ 9JeT1\VvHY m63>P4h? 步骤 p9!jM\( |x=(}g 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。 oW>e.}d! l[<o t9P[ 图2. RPC Photonics工程漫射体不同类型的散射数据 6BZi4:PDx 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) dKevhm)R" 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 P057]cAat< 例如下所示: wzcv[C-x Sample name: EDF-C1-56 uTdz$Nh Merging data from file EDF-C1-56 0-0.txt -zZb]8\E Finished merging RPC data for sample EDF-C1-56 z~i>GN_ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt cV7a, * 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 tVNFulcz$ a. 创建一个新的散射库 vrh2}biCR b. 散射模型命名 ~wcp&D c. 改变散射模型为“Tabulated BSDF”. kX*.BZI}C 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 ) )EcfEym.> 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。 _s:5) 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, WopA7J, g. 点击OK }h|HT 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 8M]QDgd. !,sQB_09C @Y ?p-& 脚本代码: qZlL6 	HV '#Language "WWB-COM" DD6K[\ /N")uuv Option Explicit \_)mWK,h @lqI,Ce5 Sub Main n<eK\w T:!H^ 'Cleanup er@.<Dc ClearOutputWindow() <d[GGkY]= jS|jPk|I. Print "Merging RPC Photonics BSDF Data Files" &x@N5j5Q SetTextColor(255,0,0) <!*O[0s Print "Note: Script should be located in the same folder as the BSDF TXT files." P`
Gb}]rW Print "Note: Do not run this script multiple times without deleting the output file between executions." KB{/L5 SetTextColor(0,0,0) Z5*O\kJv aCyn9Y$= 'Current directory of this script (should be the same as the text files being merged) {>Qs+] Dim cDir As String fJ%A_N} cDir = MacroDir$ & "\" Qe]& 1R]h>' 'Array which will be populated with the list of files to be merged }!WuJz" Dim fList() As String, curFile As String X1Kze GetFileList( cDir, fList ) I@1VX5 /1hcw|cfC Print "" #qEUGD` Print "Files found for merging:" Nig)!4CG For Each curFile In fList Lp+?5DjLT Print Chr(9) & curFile ph3dm\U. Next JP]-a!5Ru #-PUm0| 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. -(E-yCu Dim nameArray() As String, sampName As String #BI6+rfv| nameArray = Split(fList(0)," 0-0.txt") {!pYQ|# sampName = nameArray(0) WaiM\h?=# Print "" (cp$poo Print "Sample name: " & Chr(9) & sampName .]; ` Ujvk*~: 'Open an output file and write the FRED header data Qs 'dwc Dim outFile As String
U.ew6`'Te outFile = cDir & sampName & "_FRED.txt" Nu><r Open outFile For Output As #1 K48QkZ_gY Print #1, "type bsdf_data" x`K"1E{2 Print #1, "format angles=deg bsdf=value scale=1" `CG% Y>+ hM8FN 'Loop the file list, skip the two header lines and write the remaining data to file z~jk_|?|? Dim lineArray() As String, curLine As Long TezwcFqH For Each curFile In fList F&OcI.OTXF Print "Merging data from file " & curFile WwLV^m] ReadFile( cDir & curFile, lineArray ) I$f'BAw For curLine = 2 To UBound(lineArray) ?cD_\~ Print #1, lineArray(curLine) g7K<"Z {M Next J^mm"2 Next Lnl-han% ?1H>k<Jp 'Close the output file ASr3P5/ Close #1 a*o k*r *C(q{|f Print "Finished merging RPC data for sample " & sampName XE;aJ'kt Print "FRED formatted data file: " & Chr(9) & outFile l,
-q:8 End Sub ::Pf\Lb> (=tu~ ^ 'Utility function to read the contents of a file into an array of strings. 9YwS"~Q =w Function ReadFile(ByVal fileName As String, _ 6/|"y ByRef lineArray() As String) As Long T{Yk/Z/}? =fI0q7]ndz ReadFile = -1 rmdG"s Dim oFSO As Object eie u|_ Set oFSO = CreateObject("Scripting.FileSystemObject") l
i2/"~l Erase lineArray tsf!Q nY?X@avo> Dim fid As Long zi,":KDz# If oFSO.fileexists( fileName ) Then {G _|gs fid = FreeFile() Jv D`RUh Open fileName For Input As fid \6,Z<.I lineArray = Split(Input(LOF(fid), fid), vbCrLf) %&4\'lE Close fid t\lx*_lr End If HjX)5@"o( Set oFSO = Nothing o%v,6yv Return UBound( lineArray ) D o!]t7Y$ =
8\'AU End Function @C5%`{\ )h;zH,DA[3 Sub GetFileList( ByVal in_dir As String, _ W u693< ByRef in_flist() As String ) SSr2K Y1 6pT 'Redimension the file list array `aaT
#r Erase in_flist A
Zv| |8p Nv\<>gA: 'Tracks how many files are found H=5#cPI#(^ Dim fCount As Long :']O4v#^ fCount = 0 f2{qj5 K avH3{V 'Recurse directory and search for text files r A9Rz^;xa Dim f As String $dHD f = Dir$(in_dir & "*.txt") %(kf#[zQ While f <> "" 'a enhj ReDim Preserve in_flist(fCount) A*3R@G*h in_flist(fCount) = f < nyk:E fCount += 1 H3qL&xL f = Dir$() iTeFy-Ct Wend "yxBD
7 ReDim Preserve in_flist(fCount-1) 8R.`* 0 mR End Sub s B!2't |n.ydyu` I,!>ZG@6 QQ:2987619807 |}K7Q
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