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摘要: :j }fC8' UFAL1c<V 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。 /,=@8k!t? Rp7ntI: 背景: RPd}Wf 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。 @f]{>OS 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。 y\dEk:\) 图1. RPC Photonics工程漫射体结构及光束投射形状 W6 H,6v r$Co0!. k@ZLg9 步骤 Suk yeDsJ/L 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 :G\<y Urr#N 图2. RPC Photonics工程漫射体不同类型的散射数据 ;{h CF 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) r}[7x]sP 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 !$N<ds. 例如下所示: < -W*$?^ Sample name: EDF-C1-56 ^uv<6 Merging data from file EDF-C1-56 0-0.txt bwiPS1+); Finished merging RPC data for sample EDF-C1-56 A+hT3;lp FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt b)(?qfXWP 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 !*6CWV0 a. 创建一个新的散射库 7qTE('zt b. 散射模型命名 L|bwZ,M=}? c. 改变散射模型为“Tabulated BSDF”. r{l(O,|e d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) .`>y@p! e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 jReXyRmo({ f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, <! )** g. 点击OK A\8}|r(>9E 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 2^i(gaXUQ aaD;jxT&M| 3U_2! zF3_ 脚本代码: qOIW(D e[hcJz!D '#Language "WWB-COM" [1.+HyJ} "*G.EiLq Option Explicit R<OI1,..r (?nCyHC%g Sub Main }.s~T#v E[Cb|E 'Cleanup yj^+G ClearOutputWindow() \hCH>*x< GnvL'ESa@M Print "Merging RPC Photonics BSDF Data Files" As>_J=8} 3 SetTextColor(255,0,0) w^t/9Nasi Print "Note: Script should be located in the same folder as the BSDF TXT files." D_vbSF) Print "Note: Do not run this script multiple times without deleting the output file between executions." yn#X;ja- SetTextColor(0,0,0) h:9Zt0, S~|T4q( 'Current directory of this script (should be the same as the text files being merged) _3ZYtmn. Dim cDir As String j_Yp>=+[ cDir = MacroDir$ & "\" CHz+814 hP15qKy 'Array which will be populated with the list of files to be merged `]%|f Dim fList() As String, curFile As String AM!G1^c GetFileList( cDir, fList ) H)n9O/u s_mS^`P7 Print "" i-6Z"b{ Print "Files found for merging:" Cg(Y&Gxf. For Each curFile In fList MG.`
r{5 Print Chr(9) & curFile )==Jfn y Next <u2 }i<# DY`kx2e! 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. @Z12CrJ Dim nameArray() As String, sampName As String b9l;a+]d nameArray = Split(fList(0)," 0-0.txt") Y=Kc'x[,Zj sampName = nameArray(0) P?k0zwOlBl Print "" `^)jLuyu
Print "Sample name: " & Chr(9) & sampName _fKou2$yz 4qk9NK2 U 'Open an output file and write the FRED header data Ig
f&l`\ Dim outFile As String #?S^kM-0 outFile = cDir & sampName & "_FRED.txt" sfNE68I2 Open outFile For Output As #1 h D/*h*}T> Print #1, "type bsdf_data" Fx2bwut.K Print #1, "format angles=deg bsdf=value scale=1" P09;ng67 ,LnII 'Loop the file list, skip the two header lines and write the remaining data to file JT!9\i Dim lineArray() As String, curLine As Long X<I+&Zi For Each curFile In fList h-[VH% Print "Merging data from file " & curFile J|qZ+A[z ReadFile( cDir & curFile, lineArray ) H*r)Z90 For curLine = 2 To UBound(lineArray) +8Rg F Print #1, lineArray(curLine) |EJD3& Next H["`Mn7j2 Next =Lf,?"S 0E3[N:s 'Close the output file '2 PF Close #1 $adbCY\ NeE
t Print "Finished merging RPC data for sample " & sampName a m|F?|1 Print "FRED formatted data file: " & Chr(9) & outFile JPoN&BTCj End Sub SMpH._VFeE v]B3m 'Utility function to read the contents of a file into an array of strings. f,kZ\Ia'r Function ReadFile(ByVal fileName As String, _ ?B2] -+Y ByRef lineArray() As String) As Long |Uc_G13Y{D YTUZoW2 ReadFile = -1 $\X[@E S0 Dim oFSO As Object ,g2ij Set oFSO = CreateObject("Scripting.FileSystemObject") 2#c<\s|C Erase lineArray &E.^jR~* ?#}N1k\S Dim fid As Long @`q:IIgW If oFSO.fileexists( fileName ) Then K<>oa[B9 fid = FreeFile() B><d9d Open fileName For Input As fid YQj 2 lineArray = Split(Input(LOF(fid), fid), vbCrLf) a,k>Q` Close fid W04@!_) < End If 6WXRP;!Q Set oFSO = Nothing H9YW Return UBound( lineArray ) l1BtI_7p t/VD31 End Function : y%d JB<Sl4 Sub GetFileList( ByVal in_dir As String, _ X-K=!pET ByRef in_flist() As String ) DtXrWS/ |)(VsVG& 'Redimension the file list array /_I]H Erase in_flist Rwz0poG`WG Z2qW\E^_r 'Tracks how many files are found f4 P8Oz Dim fCount As Long ;f#v0W`5 fCount = 0 ~*z% e*EL C~2F9Pg 'Recurse directory and search for text files Enum/O5 Dim f As String Q(wx nm f = Dir$(in_dir & "*.txt") }$SavB#SBP While f <> "" <
$J>9k ReDim Preserve in_flist(fCount) v%+:/m1 in_flist(fCount) = f 7%Gwc?[x fCount += 1 RP[{4Q8 f = Dir$() hI]Hp3S Wend }wr{W:j ReDim Preserve in_flist(fCount-1) 5m\<U` {< )1q ; End Sub $'BSH4~|.
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