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摘要: dx_6X!=.J tB(4Eq
\ 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。 D #2yIec m@xi0t 背景: e,1u 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。 h+7># *DH 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。 *=F(KZ 图1. RPC Photonics工程漫射体结构及光束投射形状 F
8yF qztV,R T wNCCH55Pt 步骤 NY (g8*d^u#PO 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。 5rxA<Gs %uESrc-; 图2. RPC Photonics工程漫射体不同类型的散射数据 #G^A-yjn 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) EYS>0Y 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 P1kB>"bR 例如下所示: A/*%J74v Sample name: EDF-C1-56 #~ v4caNx Merging data from file EDF-C1-56 0-0.txt B uQ|~V Finished merging RPC data for sample EDF-C1-56 Jcf"#u-Q/ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt $+=
<(* 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 JyBp-ii a. 创建一个新的散射库 - Xupq/[, b. 散射模型命名 !R{R?? c. 改变散射模型为“Tabulated BSDF”. *b(wVvz 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 ) ?2J?XS> 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。 T`YwJ6N 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, H-t|i g. 点击OK hXL|22>w< 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 oY9FK{ 5fjd{Y[k $< %B#axL 脚本代码: :Hy] @uleyB '#Language "WWB-COM" Rs;15@t@ D9ufoa&ua Option Explicit xh9qg0d fZryG Sub Main 3!9Z=-tD %HuyK 'Cleanup |^n3{m ClearOutputWindow() AHh#Fx+K Q
s(Bnb; Print "Merging RPC Photonics BSDF Data Files" Zc5
:]] SetTextColor(255,0,0) ,{}#8r` +* Print "Note: Script should be located in the same folder as the BSDF TXT files." J\co1kO9/ Print "Note: Do not run this script multiple times without deleting the output file between executions." _GaJXWMbk SetTextColor(0,0,0) , |E$' A*]$v 'Current directory of this script (should be the same as the text files being merged) :R6Q=g= Dim cDir As String C".1+Um cDir = MacroDir$ & "\" 6vs3O
v|t{1[C 'Array which will be populated with the list of files to be merged kyUl{Zj Dim fList() As String, curFile As String Buc_9Kzw<+ GetFileList( cDir, fList ) o+?@5zw-& mf$j03tu Print "" +++pI.>(*Q Print "Files found for merging:" 6qp5Xt+ For Each curFile In fList L10IF Print Chr(9) & curFile QJX/7RA Next p]|LV)R n {[OwMk 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ? Nj)6_& Dim nameArray() As String, sampName As String /XpSe<3 nameArray = Split(fList(0)," 0-0.txt") M@7Xp)S" sampName = nameArray(0) pA4 ,@O Print "" ocA]M=3~k Print "Sample name: " & Chr(9) & sampName "~+.Af /'&;Q7!) 'Open an output file and write the FRED header data fj']?a!m Dim outFile As String .Ao0;:;(2- outFile = cDir & sampName & "_FRED.txt" !vqC+o>@ Open outFile For Output As #1 LsTffIP Print #1, "type bsdf_data" s@@1
*VQ Print #1, "format angles=deg bsdf=value scale=1" R{}qK r ]|oJ)5P 'Loop the file list, skip the two header lines and write the remaining data to file I48VNX Dim lineArray() As String, curLine As Long J\`^:tcG For Each curFile In fList mUXk9X%n Print "Merging data from file " & curFile Gp2!xKgm ReadFile( cDir & curFile, lineArray ) x7ATI[b[ For curLine = 2 To UBound(lineArray) =4NqjSH Print #1, lineArray(curLine) Xa,&ef&q Next S`g;Y
' Next szq+@2: 3oBC
'Close the output file #BJ\{"b_}z Close #1
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J$[ rG6\ynBX% Print "Finished merging RPC data for sample " & sampName ;sQbn|=e" Print "FRED formatted data file: " & Chr(9) & outFile "kSwa16O End Sub 4M`Xrfwm'[ __\P`S_ 'Utility function to read the contents of a file into an array of strings. qu{mqkfN> Function ReadFile(ByVal fileName As String, _ K8Zt:yP ByRef lineArray() As String) As Long P[i\e7mR (2txM"Dja ReadFile = -1 :YvbU Y Dim oFSO As Object ;93KG4a Set oFSO = CreateObject("Scripting.FileSystemObject") O%$O(l Erase lineArray %$n02"@ j$PI,` Dim fid As Long OgMI If oFSO.fileexists( fileName ) Then 2VYvO=KA fid = FreeFile() gxM[V>[ Open fileName For Input As fid #+G`!<7/@f lineArray = Split(Input(LOF(fid), fid), vbCrLf) n`<S&KP| Close fid myvh@@N End If j%xBo: Set oFSO = Nothing 9k`~x1Y) Return UBound( lineArray ) qx%jAs+~ ]P3[.$z End Function fValSQc!U ^, wnp@ Sub GetFileList( ByVal in_dir As String, _ %V_eJC""? ByRef in_flist() As String ) wRbw CA^.?&CH^O 'Redimension the file list array fN[n>%)VO< Erase in_flist R}k69-1vL =J3`@9; 'Tracks how many files are found _S5gcPcF" Dim fCount As Long G8P+A1
f/> fCount = 0 K%2I w2Kq(^? 'Recurse directory and search for text files Xw(3j)xQ Dim f As String /0\QL+^! f = Dir$(in_dir & "*.txt") BE4\U_]a3 While f <> "" ;,`]O!G:P ReDim Preserve in_flist(fCount) h AAU ecx in_flist(fCount) = f G"Pj6QUva fCount += 1 e6m1NH4, f = Dir$() lC{L6&T Wend ~XQ$aRl& ReDim Preserve in_flist(fCount-1) 5"2@NL LDX y}hm) End Sub y:9?P~
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