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摘要: z2_*%S@ bz2ztH9 n 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。 n,V[eW#m'L j@U]'5EVB 背景: d *|Y
o 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。 HJLG=mU 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。 +_?hK{Ib" 图1. RPC Photonics工程漫射体结构及光束投射形状 0y" $MC v FxtQXu-g r6MMCJ|G 步骤 P}y +G| .
y-D16V 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 :Ij{s Jr
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图2. RPC Photonics工程漫射体不同类型的散射数据 n.`($yR_ 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) {W=%U|f 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 dGYn4i2k? 例如下所示: :0j?oY~e Sample name: EDF-C1-56 z0p*Z& Merging data from file EDF-C1-56 0-0.txt 8 S:w7Hr Finished merging RPC data for sample EDF-C1-56 +,TRfP
Fb FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt I {S;L 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 h5{'Q$Erl a. 创建一个新的散射库 G_3O]BMKd) b. 散射模型命名 ?cBwPetp c. 改变散射模型为“Tabulated BSDF”. hYT0l$Ng 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 ) uy[At+%zg 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_95|3kc 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, [fya)} g. 点击OK 6y%qVx#! 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 (lBCO?`fx dUeN*Nq&(, E"\<s3 脚本代码: dh`K`b4I q1$N>;& '#Language "WWB-COM" ]_mb7X> ??-[eB. Option Explicit <y2U3;t fnjPSts0 Sub Main IXMop7~ u<7/0;D#+ 'Cleanup *KZYv=s,u ClearOutputWindow() ?yrX)3hyH =t#llgi~ Print "Merging RPC Photonics BSDF Data Files" iW]j9} t SetTextColor(255,0,0) q 6:dy Print "Note: Script should be located in the same folder as the BSDF TXT files." [64:4/<} Print "Note: Do not run this script multiple times without deleting the output file between executions." 'Vzp2 SetTextColor(0,0,0) T]f ;km ?(' wn< 'Current directory of this script (should be the same as the text files being merged) L:KF_W.I+ Dim cDir As String <.x{|p cDir = MacroDir$ & "\" m)ky*"( $u$!tj 'Array which will be populated with the list of files to be merged y|C(X Dim fList() As String, curFile As String VZp5)-!\ GetFileList( cDir, fList ) guq{#?} oA7tEu Print "" [`#CXq' Print "Files found for merging:" z\\[S@>pt For Each curFile In fList LiC*@W Print Chr(9) & curFile 2.`\ Next O W_{$9U 0cv{ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. FZ{h?#2? Dim nameArray() As String, sampName As String *<$*"p nameArray = Split(fList(0)," 0-0.txt") Q,,e+exbb5 sampName = nameArray(0) G)AqbY Print "" 0JWDtmK=C Print "Sample name: " & Chr(9) & sampName e@L=LW> A9KET$i@v 'Open an output file and write the FRED header data R~TTL Dim outFile As String yJ[0WY8<kC outFile = cDir & sampName & "_FRED.txt" A]_7}<<N Open outFile For Output As #1 2 ~dE<} Print #1, "type bsdf_data" 70yFaW Print #1, "format angles=deg bsdf=value scale=1" >2Y=*K,: gldAP: 'Loop the file list, skip the two header lines and write the remaining data to file +C^nO=[E Dim lineArray() As String, curLine As Long Z\(q@3 C For Each curFile In fList YU'k#\gi* Print "Merging data from file " & curFile vz@A;t ReadFile( cDir & curFile, lineArray ) <v"R.< For curLine = 2 To UBound(lineArray) n QF(vTDN Print #1, lineArray(curLine) J@/kIrx Next ")1:F> Next juP7P[d$qW WqR&&gz 'Close the output file 0gu_yg! R Close #1 s-NX o >1X|^ Print "Finished merging RPC data for sample " & sampName <X#C)-. Print "FRED formatted data file: " & Chr(9) & outFile 9sM!`Lz{ End Sub .y'>[ dUD[e,? 'Utility function to read the contents of a file into an array of strings. 4V"E8rUL( Function ReadFile(ByVal fileName As String, _ ob!P;]T ByRef lineArray() As String) As Long 7RQR)DG Ky`qskvu ReadFile = -1 c rQ8q;: Dim oFSO As Object nd`1m[7MNu Set oFSO = CreateObject("Scripting.FileSystemObject") a)!o @ Erase lineArray ./XYd"p e_^26^{q Dim fid As Long \Zb;'eDv If oFSO.fileexists( fileName ) Then nF}vw |r>x fid = FreeFile() #QZe,"C9` Open fileName For Input As fid b;L\EB lineArray = Split(Input(LOF(fid), fid), vbCrLf) mupT<_Y Close fid b8H{8{wi| End If \wmN Set oFSO = Nothing g%aYDl Return UBound( lineArray ) V_)-#=J gZVc 5u< End Function 9FF0%*tGo "BAK !N$9 Sub GetFileList( ByVal in_dir As String, _ Oz.HH ByRef in_flist() As String ) >e
lJkq| (xycJ`N 'Redimension the file list array j<u pRS,$ Erase in_flist oE6tauQn mb1FWy=3 'Tracks how many files are found y4yhF8E>;U Dim fCount As Long )',R[|< fCount = 0 fT|.@%"vc z>xmRs
'Recurse directory and search for text files pR<`H' Dim f As String rV.}PtcFY f = Dir$(in_dir & "*.txt") Z<oaK While f <> "" aNsBcov3O ReDim Preserve in_flist(fCount) n>z9K') in_flist(fCount) = f Nd4f^Y fCount += 1 KV91)U f = Dir$() 'I|v[G$l Wend <(#(hDwy ReDim Preserve in_flist(fCount-1) qyb?49I 'JtBZFq End Sub . P viA v4<nI;Ux e
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