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摘要: t!SQLgA }AW)R&m 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。 \~t~R q d:pm|C|F 背景: aRKRy 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。 !*Z)[[ 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。 Gu`Vk/& 图1. RPC Photonics工程漫射体结构及光束投射形状 &NjZD4m`= eBTedSM?t 2{kfbm-89t 步骤
Jf<yTAm 8+a<#?; 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。 wT~;tOw~ aE+$&_>ef 图2. RPC Photonics工程漫射体不同类型的散射数据 &IEBZB\/+& 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ?VZXJO{^ 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 Ym{%"EB 例如下所示: @b*T4hwA. Sample name: EDF-C1-56 3ZL7N$N}7 Merging data from file EDF-C1-56 0-0.txt gDNTIOV Finished merging RPC data for sample EDF-C1-56 csX*XiDWm FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt &tz%WW%D8 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 +.#S[G a. 创建一个新的散射库 *DCNu{6 b. 散射模型命名 O;BMwg_7 c. 改变散射模型为“Tabulated BSDF”. uM)9b*Vbo 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 ) 0rJ\e 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|rFl]~a 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, QGv:h[b_ g. 点击OK @52=3 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 4a.e
,gitf O<Sc.@~ ZYR,8 y 脚本代码: R c:cVK BdB` '#Language "WWB-COM" #D LT-G0 v8[ek@ Option Explicit ?sf2h:\N TQ\wHJ Sub Main :KV,:13`D F `pyhc>1; 'Cleanup 6 ,pZRc ClearOutputWindow() YNgR1:l U~#^ ^ Print "Merging RPC Photonics BSDF Data Files" .)^3t~ SetTextColor(255,0,0) v>y8s&/ Print "Note: Script should be located in the same folder as the BSDF TXT files." @@{_[ir Print "Note: Do not run this script multiple times without deleting the output file between executions." ;TV'PJ SetTextColor(0,0,0) 9HNh*Gc= ?V5Pt s 'Current directory of this script (should be the same as the text files being merged) ? W2I1HEy Dim cDir As String IJ_'w[k cDir = MacroDir$ & "\" %YvSHh;c 7Ysy\gZ&wp 'Array which will be populated with the list of files to be merged ^tg6JB;s Dim fList() As String, curFile As String Sp`fh7d.( GetFileList( cDir, fList ) <7FP"YU 0bPJEEd Print "" 0'%+X| Print "Files found for merging:" g"Q}h For Each curFile In fList CdzkMVH Print Chr(9) & curFile Xs%R]KOwt Next qD$GKN. Qor{1_h)+9 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. N1+4bR Dim nameArray() As String, sampName As String iUxDEt[t* nameArray = Split(fList(0)," 0-0.txt") m.HX2(&\3 sampName = nameArray(0) .sJys SA\ Print "" *3F /Ft5 Print "Sample name: " & Chr(9) & sampName /UaNYv/ 9o_ g_q 'Open an output file and write the FRED header data ND e[2 Dim outFile As String Z}LOy^TL outFile = cDir & sampName & "_FRED.txt" TRySl5jx@ Open outFile For Output As #1 @wEKCn|}o Print #1, "type bsdf_data" STXqq[+Rf Print #1, "format angles=deg bsdf=value scale=1" n $O.> hk7(2j7B 'Loop the file list, skip the two header lines and write the remaining data to file oA!5dpNhU Dim lineArray() As String, curLine As Long J I+KS For Each curFile In fList u"#6_-0y Print "Merging data from file " & curFile 7}#*3*] ReadFile( cDir & curFile, lineArray ) H)j[eZP For curLine = 2 To UBound(lineArray) 1C}pv{0:& Print #1, lineArray(curLine) U+9-li Next ]uStn Next e_I; y vR%j#v|s 'Close the output file M!&_qj&N, Close #1 nCffBc as\<nPT{Fj Print "Finished merging RPC data for sample " & sampName J+3\2D? Print "FRED formatted data file: " & Chr(9) & outFile kwDh|K End Sub qEK4I}Q-= $,; ;u:- 'Utility function to read the contents of a file into an array of strings. t`<}UWAH+ Function ReadFile(ByVal fileName As String, _ Vp(D|}P ByRef lineArray() As String) As Long koncWyW P<cMP)+K ReadFile = -1 p@cfY]<7 Dim oFSO As Object HQ|o%9~ Set oFSO = CreateObject("Scripting.FileSystemObject") F.~n Erase lineArray 2d5}`> "4Lg8qm Dim fid As Long Wz6]*P`qv If oFSO.fileexists( fileName ) Then ;xW8Z<\- fid = FreeFile() :"OZc7
~ Open fileName For Input As fid mHK@(D7X lineArray = Split(Input(LOF(fid), fid), vbCrLf) cW81 Close fid *1|YLy End If ":UWowJO Set oFSO = Nothing msA' 5> Return UBound( lineArray ) Ax5mP8S rQu End Function G*P[z'K= {\vI9cni|" Sub GetFileList( ByVal in_dir As String, _ HZQDe& ByRef in_flist() As String ) fbh6Ls/ [+hy_Nc$ 'Redimension the file list array XPHQAo[(s Erase in_flist %+AS0 JhB 8BYIxHHz 'Tracks how many files are found ;,v!7 Dim fCount As Long eVqM=%Q fCount = 0 nuf@}W>y }Kvh`@CiJ 'Recurse directory and search for text files bn0"M+7)f Dim f As String tyc8{t#Z f = Dir$(in_dir & "*.txt") );Tx5Z} While f <> "" O{lIs_1.Z ReDim Preserve in_flist(fCount) =8$|_ in_flist(fCount) = f :[y]p7;{f fCount += 1 a(PjcQ4dY f = Dir$() HBt|}uZ?6i Wend $Nj'OJSj% ReDim Preserve in_flist(fCount-1) 6@"Vqm|HD ??%)|nj. End Sub qg^(w fI
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