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摘要: ]"3(UKx PTu~PVbp4 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。 ]#C;)Vy )$* T>.JA 背景: .,C8ASfh Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 uqhNi!; FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 5z8!Nmb/ 图1. RPC Photonics工程漫射体结构及光束投射形状 p+O2: H+]>*^'8 s
uT#k3 步骤 qL6Rs /$ 7_*4e 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。 ~*|0yPFg A=7
[^I2 图2. RPC Photonics工程漫射体不同类型的散射数据 A~CQ@ 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) -?A,N,nnX 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 g4 BEo' 例如下所示: edt(Zzk@3- Sample name: EDF-C1-56 .c[v /SB] Merging data from file EDF-C1-56 0-0.txt Y7{9C*> Finished merging RPC data for sample EDF-C1-56 <z3:*=! FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt aj1o 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 7b,5*]oZ a. 创建一个新的散射库 y/>]6Pj b. 散射模型命名 ! 5rja-h c. 改变散射模型为“Tabulated BSDF”. $Ik\^:- 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 ) P"`OuN 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。 {iGk~qN 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, 1M|DaAI g. 点击OK \($EYhx 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 QU/Q5k yq{k:) b(lC7Xm 脚本代码: WXqrx*?*+ #tyHj k '#Language "WWB-COM" *5DOTWos mK3U*)A
Option Explicit VU1;ZJE O]OZt,k( Sub Main T{1Z(M+ fr~e!!$H 'Cleanup %4:tRF ClearOutputWindow() M@e&uz!Rx 8~QEJW$ Print "Merging RPC Photonics BSDF Data Files" ?UAB}CjY SetTextColor(255,0,0) PTfy# Print "Note: Script should be located in the same folder as the BSDF TXT files." ;dt&*]wA Print "Note: Do not run this script multiple times without deleting the output file between executions." xP<cF SetTextColor(0,0,0) p)d0ZAs nwlo,[ 'Current directory of this script (should be the same as the text files being merged) gf`uC0 Dim cDir As String |k~\E|^ cDir = MacroDir$ & "\" $gsn@P>" B_w;2ZuA 'Array which will be populated with the list of files to be merged xU/Eu;m Dim fList() As String, curFile As String 6,j6,Q(67 GetFileList( cDir, fList ) %;UEyj Q ^%+r"h Print "" 38IVSK_ Print "Files found for merging:" bXoj/zek For Each curFile In fList v~>^c1: Print Chr(9) & curFile [4:_6vd7X Next \BC|`)0h k'uN2m 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. )Yvf9dl Dim nameArray() As String, sampName As String _@3?yv~ D nameArray = Split(fList(0)," 0-0.txt") ,^MA,"8 sampName = nameArray(0) ^E&':6( Print "" ShAI6j Print "Sample name: " & Chr(9) & sampName Ic4>kKh MIPmsEdBi 'Open an output file and write the FRED header data Yr@)W~ Dim outFile As String 7bioLE outFile = cDir & sampName & "_FRED.txt" Gd$odKtI Open outFile For Output As #1
KQ<pQkhv Print #1, "type bsdf_data" "(/
1]EH` Print #1, "format angles=deg bsdf=value scale=1" T"Ph@I< 8=x{>&Jr 'Loop the file list, skip the two header lines and write the remaining data to file g+gHIb7{ Dim lineArray() As String, curLine As Long pyZ&[*@ For Each curFile In fList ^ g`1SU` Print "Merging data from file " & curFile vS%r_gf( ReadFile( cDir & curFile, lineArray ) JFVal# For curLine = 2 To UBound(lineArray) 1_uq46 Print #1, lineArray(curLine) mc_`:I= Next @)m H"u!(7 Next y?W8FL |V{'W-`
|[ 'Close the output file 3IHya=qN Close #1 n|F$qV_p\
TCJH^gDt Print "Finished merging RPC data for sample " & sampName z5Hz-. Print "FRED formatted data file: " & Chr(9) & outFile 1,fjdd8OM; End Sub c #+JG E!J;bX5 'Utility function to read the contents of a file into an array of strings. O.S(H1z<G Function ReadFile(ByVal fileName As String, _ IbAGnl { ByRef lineArray() As String) As Long v|~ yIywf T'2(sHk ReadFile = -1 X_XeI!,b Dim oFSO As Object v/6QE;BY&Q Set oFSO = CreateObject("Scripting.FileSystemObject") /)?]vKMiI Erase lineArray ('!90 X"<t3l(+ Dim fid As Long a?%X9 +1A If oFSO.fileexists( fileName ) Then z-nhL= fid = FreeFile() +.MHI Open fileName For Input As fid A][\L[8X lineArray = Split(Input(LOF(fid), fid), vbCrLf) Px:PoOw\ Close fid CZg$I&x End If OpmI" 4{+ Set oFSO = Nothing Jla ;^X Return UBound( lineArray ) t5n$sF 4;8
Z?. End Function p%5RE%u 1{R1:` Sub GetFileList( ByVal in_dir As String, _ g&;:[&%T] ByRef in_flist() As String ) XPE{]4 g '~A~gK0 'Redimension the file list array ,dK<2XP Erase in_flist y)?Sn K:/%7A_{ 'Tracks how many files are found N8;/Zd;^ Dim fCount As Long ^yiRrcOo fCount = 0 hb7H- Z2 & D4'hL3 'Recurse directory and search for text files %c)^8k;I Dim f As String ^'r/;(ZF*/ f = Dir$(in_dir & "*.txt") GQO}E@W6C While f <> "" !]7r>NS> ReDim Preserve in_flist(fCount) D U#6%8~ in_flist(fCount) = f VqLqj$P fCount += 1 U#R=y:O? f = Dir$() I:[^><?E Wend K"-.K]O8E% ReDim Preserve in_flist(fCount-1) ^B~z .F
i ]cLO-A End Sub u-0-~TwD
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