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摘要: ./6L&?*`~; Ek4aC3 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。 p?!]sO1l W9u( 背景: Xu'u"amt 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。
e%qMrR 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。 OixQlAb{ 图1. RPC Photonics工程漫射体结构及光束投射形状 31_5k./ 8gx^e./ #<?j784 步骤 ;hKn$' ' *|4~
0w 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 %;zA_Wg R{*p\; 图2. RPC Photonics工程漫射体不同类型的散射数据 ]`|bf2*eA 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 6L*y$e"Qc 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 B[Tw0rQ 例如下所示: *{tJ3<t(1 Sample name: EDF-C1-56 =g&0CFF < Merging data from file EDF-C1-56 0-0.txt Nl(Aa5:! Finished merging RPC data for sample EDF-C1-56 V^f'4*~' FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt H%/$Rqg 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Ru
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&#[ a. 创建一个新的散射库 -Y+[`0$' b. 散射模型命名 %i^%D c. 改变散射模型为“Tabulated BSDF”. vF*H5\ m<a 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 ) 5v?6J#]2 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。 *rqih_j0 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, CqF<
BE g. 点击OK SR\#>Qwx_ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 .Oim7JQ8 FS']3uJ/ +]AE}UXZoh 脚本代码: TX 12$p\ b9:E0/6
'#Language "WWB-COM" LtNG<n)_BH 8Y4YE(x5 Option Explicit [OMKk#vW }]f)Fz Sub Main bbnAF*7s8 &18} u~M 'Cleanup 3<Cd>o. ClearOutputWindow() 8T1`TGSFC rb9x|| Print "Merging RPC Photonics BSDF Data Files" ZL@7Mr!e SetTextColor(255,0,0) fXL$CgXG\x Print "Note: Script should be located in the same folder as the BSDF TXT files." =JEnK_@?K\ Print "Note: Do not run this script multiple times without deleting the output file between executions." !.F`8OD`u SetTextColor(0,0,0) id*UTY
Tg 8rw;Yo<k 'Current directory of this script (should be the same as the text files being merged) Q PGssQR6 Dim cDir As String s=28. cDir = MacroDir$ & "\" V&qXsyg ?X=9@ m 'Array which will be populated with the list of files to be merged u(d>R5}' Dim fList() As String, curFile As String ;B
tRDKn GetFileList( cDir, fList ) gBrIqM i5 `<
VoZ/v Print "" /LJ?JwAvg5 Print "Files found for merging:" >yT:eG For Each curFile In fList *S;v406 Print Chr(9) & curFile )L^WD$"'Q Next Prr<:q [=XsI]B\ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 3"q%-M|+Q Dim nameArray() As String, sampName As String ZfMJU nameArray = Split(fList(0)," 0-0.txt") `<[Zs]Fe4 sampName = nameArray(0) 2< ^B]N Print "" 9B<y w. Print "Sample name: " & Chr(9) & sampName Q:tW LVE#0 C[wnor! 'Open an output file and write the FRED header data A*@!tz< Dim outFile As String 0Wk}d(f outFile = cDir & sampName & "_FRED.txt" =#uXO< Open outFile For Output As #1 RN!oflb Print #1, "type bsdf_data" haB$W 4x Print #1, "format angles=deg bsdf=value scale=1" Kx#G_N@ '9i:b]Hru 'Loop the file list, skip the two header lines and write the remaining data to file e}7qZ^ Dim lineArray() As String, curLine As Long -6Cxz./#yS For Each curFile In fList 5$N4<Lo7 Print "Merging data from file " & curFile -O -_F6p'D ReadFile( cDir & curFile, lineArray ) E-&=I> B5 For curLine = 2 To UBound(lineArray) ]%G[<zD,1 Print #1, lineArray(curLine) 6nxf<1 Next F*hs3b0Db Next dB< \X. ou@Dd4 'Close the output file wgI$'tI Close #1 AnI ENJ U9kt7#@FDK Print "Finished merging RPC data for sample " & sampName >b<br Print "FRED formatted data file: " & Chr(9) & outFile pH)V:BmJ End Sub l6a,:*_ {8b6A~/ 'Utility function to read the contents of a file into an array of strings. B*,9{ g0m/ Function ReadFile(ByVal fileName As String, _ %vyjn&13 ByRef lineArray() As String) As Long R1A!ob Dh J<\_; ReadFile = -1 e>"{nOY4 Dim oFSO As Object >.~^( Set oFSO = CreateObject("Scripting.FileSystemObject") c_&iGQ Erase lineArray L
+-B,466 O!uX:TE|Q Dim fid As Long T4._S:~ If oFSO.fileexists( fileName ) Then K*p^Gs, fid = FreeFile() a\^DthZ!;| Open fileName For Input As fid \y#gh95 lineArray = Split(Input(LOF(fid), fid), vbCrLf) eEupqOF*:W Close fid f`H}Y!W( End If P2 f~sx9 Set oFSO = Nothing !!dNp5h` Return UBound( lineArray ) N2=gSEY eDIjcZ End Function \)`\F$CF 0Tg/R4dI Sub GetFileList( ByVal in_dir As String, _ CP/`ON ByRef in_flist() As String ) aCy2.Qn = DvnfT< 'Redimension the file list array "X"DTP1b Erase in_flist 6BNOF66kH ,8EeSnI 'Tracks how many files are found Cz m`5 Dim fCount As Long ]r6,^" fCount = 0 nA5v+d-<T &c?-z}=G 'Recurse directory and search for text files 8_m dh + Dim f As String a!xKS8-S== f = Dir$(in_dir & "*.txt") aW$7:<A{ While f <> "" nBZqhtr ReDim Preserve in_flist(fCount) *>zr'Tt,W in_flist(fCount) = f GP[;+xMBh fCount += 1 7@|(z:uw f = Dir$() H&`p9d*(e Wend vQYd!DSh ReDim Preserve in_flist(fCount-1) xw]Zo<F `N
;!=7y7Y End Sub NTls64AS.
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