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摘要: y7Hoy.( AU8sU?= 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。 ( De>k8 9?sm-qP 背景: }Am5b@g"$Y Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 v&sl_w/tn FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 >h$Q%w{V 图1. RPC Photonics工程漫射体结构及光束投射形状 Z dT- ;O<-4$ 7gRR/&ZK 步骤 ?*~sx=mC IJ7wUZp" 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。 Y3H5}4QD R I:kp.V 图2. RPC Photonics工程漫射体不同类型的散射数据 nJwP|P_ 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) G4\|bwh 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 l,UOP[j 例如下所示: E<@N4%K_Q Sample name: EDF-C1-56 Q5Epq
sKyC Merging data from file EDF-C1-56 0-0.txt BxaGBK<k Finished merging RPC data for sample EDF-C1-56 UsdMCJ&G FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt *bzqH 2h8 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ^W~8)Rbf a. 创建一个新的散射库 ~1nKL0C6u b. 散射模型命名 D&OskM60 c. 改变散射模型为“Tabulated BSDF”. Bc'Mj=>; 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 ) 3XDuo|( 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。 7zowvE?# 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, 4rpry@1 g. 点击OK "1UpoF'w 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 \:2z!\iP` @c).&7 G[{Av5g mx 脚本代码: CQ7NQ^3k |*l^<= = '#Language "WWB-COM" ('o}EoXS wU"w Option Explicit XQ8q)B= p ^9o*k`u Sub Main Yaz/L)Y;R 28 zZ3|Z3 'Cleanup }%D${.R] ClearOutputWindow() ~Q}!4LH A.~wgJDO Print "Merging RPC Photonics BSDF Data Files" }[(v(1j='~ SetTextColor(255,0,0)
6NSSuK3 Print "Note: Script should be located in the same folder as the BSDF TXT files." 8EBd`kiq Print "Note: Do not run this script multiple times without deleting the output file between executions." %\~U>3Q SetTextColor(0,0,0) 8fK/0u^`d 9~y:K$NO 'Current directory of this script (should be the same as the text files being merged) $lAdh Dim cDir As String 3#eAXIW[ cDir = MacroDir$ & "\" v@{VQVx **.23<n^W 'Array which will be populated with the list of files to be merged 3 Zwhv+CP[ Dim fList() As String, curFile As String D$E#:[ GetFileList( cDir, fList ) l8e)|MSh p[)yn%uh Print "" +{#Z^y6& Print "Files found for merging:" Bm<tCN-4 For Each curFile In fList 9Q\RCl_1 Print Chr(9) & curFile qggRS)a Next 4JXJ0T ar pimI)1 !$' 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. {aUv>T"c Dim nameArray() As String, sampName As String
b`f6(6 nameArray = Split(fList(0)," 0-0.txt") s4 Vju/ sampName = nameArray(0) j,z)x[3} Print "" XXeDOrb Print "Sample name: " & Chr(9) & sampName A$L:,b( O3pd5&^g 'Open an output file and write the FRED header data (!Xb8rV0_ Dim outFile As String >ul&x!?@ outFile = cDir & sampName & "_FRED.txt" J/PK#< Open outFile For Output As #1 r$ I k*R Print #1, "type bsdf_data" dTte4lh Print #1, "format angles=deg bsdf=value scale=1" ft0tRv(s: jc@=
b:r= 'Loop the file list, skip the two header lines and write the remaining data to file nP|ah~
q Dim lineArray() As String, curLine As Long 1[-`*Ph For Each curFile In fList ?v'CuWS Print "Merging data from file " & curFile CIRMAX ReadFile( cDir & curFile, lineArray ) IoV"t, For curLine = 2 To UBound(lineArray) 5glEV`.je Print #1, lineArray(curLine) e)3Mg^ Next ;ZkY[5 Next /AYq^ Cv
p#=x0 'Close the output file ZVit]3hd Close #1 /nEK|.j 8cRc5X Print "Finished merging RPC data for sample " & sampName ?9?o8! Print "FRED formatted data file: " & Chr(9) & outFile Ok}e|b[D End Sub n7zM;@{7 "chf\-!$ 'Utility function to read the contents of a file into an array of strings. gV*4{d` Function ReadFile(ByVal fileName As String, _ x}x )h3e ByRef lineArray() As String) As Long ^;?w<9Y $}EARW9 ReadFile = -1 "cbJ{ G1pk Dim oFSO As Object !"aGo1$$ Set oFSO = CreateObject("Scripting.FileSystemObject") {96NtR0Z Erase lineArray y5VohVa` K)h<#F Dim fid As Long nFro#qx If oFSO.fileexists( fileName ) Then {7v|\6@e3 fid = FreeFile() Z+4Mo*# Open fileName For Input As fid ZvK3Su)f1 lineArray = Split(Input(LOF(fid), fid), vbCrLf) ?*<1B Close fid %f(4jQ0I End If U8%IpI; Set oFSO = Nothing VRHS 4 Return UBound( lineArray ) &?']EcU5h9 {yi!vw End Function >z,Y%A Upm#:i|" Sub GetFileList( ByVal in_dir As String, _ s"8z q;) ByRef in_flist() As String ) OSom-?|w "kucFf f 'Redimension the file list array LOgB_$9_3 Erase in_flist Eh"Y<]$ "#{b)!EH 'Tracks how many files are found 2"o<>d Dim fCount As Long Q1H.2JXr fCount = 0 .&K?@T4l _sHeB7K 'Recurse directory and search for text files dtXtZ!g2 Dim f As String $A(3-n5= f = Dir$(in_dir & "*.txt") l
5f'R While f <> "" ?w)A`G_ ReDim Preserve in_flist(fCount) Q"qJ0f) in_flist(fCount) = f FE06,i\{ fCount += 1 TJ,?C$3 f = Dir$() wOH 3[SKo Wend u4[JDB7tH ReDim Preserve in_flist(fCount-1) E,4*a5Fi I."s&]FZ End Sub \;"S>dg
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