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摘要: kDI(Y=Fg 1><@$kVMm~ RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 lVF}G[B C^9G \s' 背景: >a/]8A Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 (3a]#`Q FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 Dx`-Kg_p 图1. RPC Photonics工程漫射体结构及光束投射形状 h6J0b_3h4 Ey<vvZ Lt`d
{s 步骤 f$#--* F]o&m::/K 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。 }dcXuX4{r Bh3N6j+$d 图2. RPC Photonics工程漫射体不同类型的散射数据 qQK0s*^W 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 7|Z=#3INw 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 7^1yZ1( 例如下所示: 4@ EY+p Sample name: EDF-C1-56 s
zBlyT Merging data from file EDF-C1-56 0-0.txt 6r Finished merging RPC data for sample EDF-C1-56 ~nYp*t C' FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt n^vL9n_N 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 pT3p!/pl3 a. 创建一个新的散射库 ]^aOYtKX b. 散射模型命名 #9{N[t c. 改变散射模型为“Tabulated BSDF”. `;KU^dH d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 6zv-nMZc e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 Mn$w_Z? 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, jw63sn g. 点击OK p5F=?*[} 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ;Q*=AW n-ZOe]3 m#
y` 脚本代码: 2XoFmV),F :
L}Fm2^ '#Language "WWB-COM" }E[u" @} U~9Y9qzy, Option Explicit wxC&KrRF \3nu &8d Sub Main J-iFAKN ~V#MI@]V~ 'Cleanup bEO\oS ClearOutputWindow() JH3$G,:zM `N;}Gf-' Print "Merging RPC Photonics BSDF Data Files" ,Sz`$'^c SetTextColor(255,0,0) ,q9nHZG^ Print "Note: Script should be located in the same folder as the BSDF TXT files." [/Q .MmnL Print "Note: Do not run this script multiple times without deleting the output file between executions." FXLY*eRk SetTextColor(0,0,0) O5rHN;\_ ai,\'%N 'Current directory of this script (should be the same as the text files being merged) #fB&Hv #s7 Dim cDir As String ;/-v4 cDir = MacroDir$ & "\" I^}q;L![\ ~H<oqk:O- 'Array which will be populated with the list of files to be merged 0)<\jo1 F Dim fList() As String, curFile As String #kGgzO GetFileList( cDir, fList ) 8bf_W3 R'Gka1v Print "" V$ 8go#5 Print "Files found for merging:" pr~%%fCh For Each curFile In fList >z{*>i,m1 Print Chr(9) & curFile =7^rKrD Next +/"Ws'5E 0`WjM2So 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ,K/l;M5I Dim nameArray() As String, sampName As String K)ZW1d; nameArray = Split(fList(0)," 0-0.txt") o7:~C] sampName = nameArray(0) ]81t~t9LQ Print "" V(gmC%6%l* Print "Sample name: " & Chr(9) & sampName ,\){-H/n t(~V:+W 9 'Open an output file and write the FRED header data `(- nSQ Dim outFile As String ajM3Uwnr outFile = cDir & sampName & "_FRED.txt" CBkI!
In2 Open outFile For Output As #1 vJ
+sdG Print #1, "type bsdf_data" %|"0p3 Print #1, "format angles=deg bsdf=value scale=1" iX&eQ{LB yT$CImP73 'Loop the file list, skip the two header lines and write the remaining data to file d#tqa`@~ Dim lineArray() As String, curLine As Long , 0hk)Vvr3 For Each curFile In fList >Bw<THx Print "Merging data from file " & curFile %w$\v"^_Y ReadFile( cDir & curFile, lineArray ) Ym% $!# For curLine = 2 To UBound(lineArray) 96(3ilAt Print #1, lineArray(curLine) pA%}CmrMq Next TTDcVG_} Next Pv#Oea? l1 M
% 'Close the output file I ~U1vtgp Close #1 R^p'gQc$
k^H&IS! Print "Finished merging RPC data for sample " & sampName #oYPe:8|m Print "FRED formatted data file: " & Chr(9) & outFile 'VMov End Sub c 5%uiv] (yJY/| 'Utility function to read the contents of a file into an array of strings. N1',`L5 Function ReadFile(ByVal fileName As String, _ =~D QX\ ByRef lineArray() As String) As Long hR4\:s+[ CD!Aa ReadFile = -1 u?Uu>9@Z Dim oFSO As Object cko^_V&x Set oFSO = CreateObject("Scripting.FileSystemObject") +nIjW;RU Erase lineArray = :/4) !=3Ce3- Dim fid As Long sQ}E4Iq1#S If oFSO.fileexists( fileName ) Then =,Zkg(M fid = FreeFile() 1u~CNHm Open fileName For Input As fid mf W}^mu lineArray = Split(Input(LOF(fid), fid), vbCrLf) hEh` cBO Close fid 3LkcK1x. End If mEZHrr J Set oFSO = Nothing w-j^jU><3 Return UBound( lineArray ) im&Nkk4n@ S{Q2KD End Function J+(B]8aj |Wg!>g! Sub GetFileList( ByVal in_dir As String, _ f=EWr8mno ByRef in_flist() As String ) mB5Sm|{ w7%.EA{N 'Redimension the file list array z 0}JiW R Erase in_flist Z}AhDIw!G J*Q+$Ai~ 'Tracks how many files are found KU=+ 1,Jf Dim fCount As Long T!jMh-8 fCount = 0 !{+a2wi 5-RA<d# 'Recurse directory and search for text files =T- jG_.H Dim f As String r
[E4/?_ f = Dir$(in_dir & "*.txt") 1KadT7<0} While f <> "" nZX`y
-AZ ReDim Preserve in_flist(fCount) b{Bef*`/ in_flist(fCount) = f 4M)oA|1w fCount += 1 xFzaVjjP f = Dir$() 20
Z/Y\ Wend u*m|o8 ReDim Preserve in_flist(fCount-1) 0aqq*e'c 4J{W8jX End Sub [y&uc @b9qBJfQ 3De(:c)@ QQ:2987619807 '!"rE1e
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