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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。 LdNpb;* %t!S 7UD 背景: m||9,z- 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。 'yA/sZ 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。 OUGkam0UK 图1. RPC Photonics工程漫射体结构及光束投射形状
z9OpxW@Ou `\;Z&jlpT @^-Y&N!b= 步骤 >D~8iuy]8.
F$'u` 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。 $2i@@#g8 (&v|,.c^)1 图2. RPC Photonics工程漫射体不同类型的散射数据
lic-68T 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) e`7>QS;. 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 LJ@r+|> 例如下所示: X;)/<:mX Sample name: EDF-C1-56 F?H=2mzKbz Merging data from file EDF-C1-56 0-0.txt 2@z .ory. Finished merging RPC data for sample EDF-C1-56 }}~a4p>% FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt CqZHs
9+e& 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 +5Dc5Bl a. 创建一个新的散射库 [v*q%Mi_ b. 散射模型命名 C3f\E: D) c. 改变散射模型为“Tabulated BSDF”. EleJ$ `/ 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 ) D g0rVV6c 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。 W 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, 'OP0#`6` g. 点击OK vF'>?O? 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 oxL<\4)WJ %3#C0%{x &}2@pu[S?7 脚本代码: .7b%7dQ<\ BU??}{ '#Language "WWB-COM" Ma$~B0!;s Ny$3$5/ Option Explicit eh]syeKBj 2=8PA/ Sub Main 2YW;=n q
jc4IW t~ 'Cleanup ,~ZD"'*n6g ClearOutputWindow() D^.
c: pXN'vP Print "Merging RPC Photonics BSDF Data Files" Jx}-Y*
o SetTextColor(255,0,0) gSw<C+ Print "Note: Script should be located in the same folder as the BSDF TXT files." {R@V Print "Note: Do not run this script multiple times without deleting the output file between executions." m26YAcip} SetTextColor(0,0,0) nC%qdzT Z/?{{}H+ 'Current directory of this script (should be the same as the text files being merged) U887@-!3 Dim cDir As String +M_ _\7 cDir = MacroDir$ & "\" S-gO =dKjTBR S' 'Array which will be populated with the list of files to be merged <Ohi+a%6 Dim fList() As String, curFile As String 0!lWxS0#= GetFileList( cDir, fList ) *DfOm`m vVa|E#
[ Print "" 3Zd,"/RH Print "Files found for merging:" ;e5PoLc For Each curFile In fList z
rSPa\M Print Chr(9) & curFile YT(Eh3ID Next {b4`\I@< bl^Ihza 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ^w~B]*A:" Dim nameArray() As String, sampName As String [yQ%g;m nameArray = Split(fList(0)," 0-0.txt") L98T!5) sampName = nameArray(0) s*yl&El/ Print "" N\|z{vn Print "Sample name: " & Chr(9) & sampName G(#t,}S}@ Sm4BZF~!B 'Open an output file and write the FRED header data !vR Zh('R Dim outFile As String M;ADL| outFile = cDir & sampName & "_FRED.txt" eU%49 A Open outFile For Output As #1 -2J37 Print #1, "type bsdf_data" 04;s@\yX4 Print #1, "format angles=deg bsdf=value scale=1"
-NN=(p!< Po@;PR= 'Loop the file list, skip the two header lines and write the remaining data to file ([<HFc` Dim lineArray() As String, curLine As Long ;]=w6'dP! For Each curFile In fList T
pF[-fO Print "Merging data from file " & curFile -W('^v_* ReadFile( cDir & curFile, lineArray ) F.$z7ee@ For curLine = 2 To UBound(lineArray) .aY$-Y< Print #1, lineArray(curLine) KU` *LB: Next ?=&S?p)-< Next ur'<8pDb$ {P~rf&Ee 'Close the output file b}0h()v Close #1 4y7_P0}:B 1a{3k#} Print "Finished merging RPC data for sample " & sampName UcQ]n0J=Z Print "FRED formatted data file: " & Chr(9) & outFile A<)n H=G& End Sub EyPJ Jc8 l|gi2~ %Y 'Utility function to read the contents of a file into an array of strings. 7<WS@-2I# Function ReadFile(ByVal fileName As String, _ 70 R6: ByRef lineArray() As String) As Long ?cRF;!o" ?}s;,_GH ReadFile = -1 ye$_=KARP Dim oFSO As Object BM /FOY; Set oFSO = CreateObject("Scripting.FileSystemObject") fS4W*P[B3 Erase lineArray \~%+)a%% ^*.$@M Dim fid As Long *%KIq/V If oFSO.fileexists( fileName ) Then 63u%=-T%a
fid = FreeFile() Q+
V<& Open fileName For Input As fid v~L\[&|_ lineArray = Split(Input(LOF(fid), fid), vbCrLf) JnBc@qnP6 Close fid .i4aM;Qy End If `~u=[}w Set oFSO = Nothing }bS1M Return UBound( lineArray ) I&La0g