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摘要: PB:r+[91 4
$)}d RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 |z)7XK SwH #=hg 背景: "W}+~Sn Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 !uKuO FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 =*WfS^O 图1. RPC Photonics工程漫射体结构及光束投射形状 Je#3 )d5mZE!3
NCx)zJ\S 步骤 %8"Aq ,v*\2oG3^ 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 Kku@!lv 7ws[Rp8 图2. RPC Photonics工程漫射体不同类型的散射数据 S.fb[gI] 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ub{Yg5{3S\ 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 W$R@Klz 例如下所示: AIwp2Fz Sample name: EDF-C1-56 pWGIA6&v( Merging data from file EDF-C1-56 0-0.txt j+3=&PkA.] Finished merging RPC data for sample EDF-C1-56 |uA /72 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt qUNXT 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 `$VnB a. 创建一个新的散射库 s.!gsCQme b. 散射模型命名 O FlY"OS[ c. 改变散射模型为“Tabulated BSDF”. gM
v0[~;u 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 ) ]u
>~: 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。 3{-
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k 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, 4Cf.%f9@ g. 点击OK ,HW[l.v 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 O/f+B}W 4p(\2?B%f UZW)% 脚本代码: X
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D S?(/~Vb% '#Language "WWB-COM" H[iR8<rhQ )!D,;,aQ Option Explicit ^pvnUODW[ ?7aeY5p Sub Main ;U<rFs40 6.QzT( 'Cleanup
qmGLc~M0 ClearOutputWindow() sMWNzt ~jOk?^6 Print "Merging RPC Photonics BSDF Data Files" +C[%^G-: SetTextColor(255,0,0) $%3%&+z$I Print "Note: Script should be located in the same folder as the BSDF TXT files." e:WKb9nT Print "Note: Do not run this script multiple times without deleting the output file between executions." &B ^LaRg SetTextColor(0,0,0) a"X9cU[ E$E#c8I: 'Current directory of this script (should be the same as the text files being merged) 5+iXOs< Dim cDir As String |VML.u:N cDir = MacroDir$ & "\" 7a<:\F}E0 ^9?IS<N0] 'Array which will be populated with the list of files to be merged e[L%M:e9U Dim fList() As String, curFile As String -f8iq[F5 GetFileList( cDir, fList ) um1xSf1Xv Jm*wlN
[> Print "" C.9l${QU Print "Files found for merging:" t\\`#gc9~i For Each curFile In fList X?OH//co Print Chr(9) & curFile m3 W Next Q)\4 .d `"qSr%| 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. c\(CbC Dim nameArray() As String, sampName As String Meo.
V|1 nameArray = Split(fList(0)," 0-0.txt") 4xD`Z_U sampName = nameArray(0) X< p KAO\ Print "" ORo,.#< Print "Sample name: " & Chr(9) & sampName }:hN}*H '@,M
'H{ 'Open an output file and write the FRED header data 8iUj9r_ Dim outFile As String J`d;I#R%c outFile = cDir & sampName & "_FRED.txt" JWvL Open outFile For Output As #1 }w/6"MJ[n Print #1, "type bsdf_data" yk&PJ;%O< Print #1, "format angles=deg bsdf=value scale=1" #hF(`oX}4K 78/,rp#'_ 'Loop the file list, skip the two header lines and write the remaining data to file ]?a i Dim lineArray() As String, curLine As Long k^*S3#" For Each curFile In fList q!\4|KF~ Print "Merging data from file " & curFile MPD<MaW$ ReadFile( cDir & curFile, lineArray ) )V?:qCuY> For curLine = 2 To UBound(lineArray) :[.**,0R Print #1, lineArray(curLine) QNm8`1 Next R*r;`x Next BXB ZX@jVk .h[yw$z6 'Close the output file .FpeVjR'' Close #1 8a3h)R EK$3T5e Print "Finished merging RPC data for sample " & sampName /V$U%0 Print "FRED formatted data file: " & Chr(9) & outFile 7FGi+ End Sub :SvgXMY@ ;HoBLxb P
'Utility function to read the contents of a file into an array of strings. 20A`]-D Function ReadFile(ByVal fileName As String, _ V(3=j)# ByRef lineArray() As String) As Long w0`8el; =`Lci1#pu} ReadFile = -1 6g&Ev' Dim oFSO As Object + Un(VTD Set oFSO = CreateObject("Scripting.FileSystemObject") 3
G_0DS Erase lineArray aGq1YOD[$ r6gfxW5 Dim fid As Long Bw25+l Px If oFSO.fileexists( fileName ) Then Tqj:C8K{ fid = FreeFile() xY>@GSO1 Open fileName For Input As fid &r)[6a$fW lineArray = Split(Input(LOF(fid), fid), vbCrLf) szC<ht?z Close fid Z|$M 9E End If 8(ej]9RObU Set oFSO = Nothing 5L\&"[' Return UBound( lineArray ) K$/&C:,Q BnUWg ^E End Function TP{2q51yM O QGKH6q Sub GetFileList( ByVal in_dir As String, _ -+{<a!Nb ByRef in_flist() As String ) bYAtUEv ,9Si3vn 'Redimension the file list array c8Je&y8 Erase in_flist %8{nuq+c "."ow| 'Tracks how many files are found K*S3{s%UR Dim fCount As Long .C,D;T{ fCount = 0 g+A>Bl3# N> xdX5 'Recurse directory and search for text files 75^AO>gt
Dim f As String v6P2v f = Dir$(in_dir & "*.txt") 5y8VA4L/o While f <> "" g5:?O,? ReDim Preserve in_flist(fCount) 5.d[C/pRw in_flist(fCount) = f Q|xa:`3? fCount += 1 ?kdan f = Dir$() o3YW(%cYR Wend H)+QkQb} ReDim Preserve in_flist(fCount-1) Kk`LuS? gVNoC-n) End Sub c{
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