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摘要: fZ5zsm'N ZZu{ct9 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。 6B=: P3Y -/'_XR@1 背景: N a$eeM Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 _* m<Z;Et FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 .;$Ub[ 图1. RPC Photonics工程漫射体结构及光束投射形状 CVt:tV aVvma= F!_8?=| 步骤 rijavZS6 LN0pC}F 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。 @?vC4+' $~+(si2 图2. RPC Photonics工程漫射体不同类型的散射数据 5w+KIHhN| 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) 9Gc4mwu 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 6D&{+; 例如下所示: wr-/R"fX Sample name: EDF-C1-56 =f/CBYNw@V Merging data from file EDF-C1-56 0-0.txt 2t[P-on Finished merging RPC data for sample EDF-C1-56 4Y5lP00!} FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt |W#(+m 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 j"F?^0aR,Q a. 创建一个新的散射库 \5iMr[s b. 散射模型命名 1)o6jGQ c. 改变散射模型为“Tabulated BSDF”. QJ,[K_ 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 ) \]8F_K 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。 bt{b%r 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, e~U]yg5X- g. 点击OK \'Q rJ ?D 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 U
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"bii7h 脚本代码: J6I:UML 1.tAl6] '#Language "WWB-COM" )! eJW( abD@0zr Option Explicit f
OasX!= S"4eS,5L| Sub Main dfP4SJqq
z?^oy. 'Cleanup = ;cTm5d;T ClearOutputWindow() zub"Ap3 hp1+9vEN Print "Merging RPC Photonics BSDF Data Files" Uv m:`e~? SetTextColor(255,0,0) ?Kt F!:_C Print "Note: Script should be located in the same folder as the BSDF TXT files." (Z0_e&=* Print "Note: Do not run this script multiple times without deleting the output file between executions." g\% Z+Dc SetTextColor(0,0,0) I`f5)iF?0 02_+{vk! 'Current directory of this script (should be the same as the text files being merged) 5%%e$o+ Dim cDir As String z"97AXu cDir = MacroDir$ & "\" T-LX>* PU,%Y_xR 'Array which will be populated with the list of files to be merged ysj5/wtO0 Dim fList() As String, curFile As String bp!Jjct GetFileList( cDir, fList ) Vel}lQD =%B5TBG Print "" 4{@{VsXN Print "Files found for merging:" q{ [!" , For Each curFile In fList e\em;GTy Print Chr(9) & curFile `*l aUn Next +CM>]Ze :
eCeJ~&E 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ) ViBH\.*p Dim nameArray() As String, sampName As String L>h|1ZK nameArray = Split(fList(0)," 0-0.txt") =C2KHNc sampName = nameArray(0) _%[po%] Print "" [j}JCmWY Print "Sample name: " & Chr(9) & sampName :r>^^tGT! T]JmnCX>: 'Open an output file and write the FRED header data 57~y 7/ 0 Dim outFile As String 1<Sg@ outFile = cDir & sampName & "_FRED.txt" &7i&"TNptP Open outFile For Output As #1 Z5E; FGPb Print #1, "type bsdf_data" P6&%`$ Print #1, "format angles=deg bsdf=value scale=1" 1uO2I&B !
,bQ;p3g| 'Loop the file list, skip the two header lines and write the remaining data to file ftG3!} Dim lineArray() As String, curLine As Long ;=7K*npT For Each curFile In fList &s(J:P$! Print "Merging data from file " & curFile d:kn%L6k_ ReadFile( cDir & curFile, lineArray ) QgI[#d{ For curLine = 2 To UBound(lineArray) !> =ybRe Print #1, lineArray(curLine) [~u!*W Next ruQt0q,W3% Next -V:HT
j (6.uNLr 'Close the output file lXg5UrW Close #1 D<m0G]Ht*
[}YUi>NGA Print "Finished merging RPC data for sample " & sampName 5f{P% x( Print "FRED formatted data file: " & Chr(9) & outFile |{&M#qXe End Sub {fnx=BaG >MGWN 'Utility function to read the contents of a file into an array of strings. zs~Tu Function ReadFile(ByVal fileName As String, _ #1/~eIEY ByRef lineArray() As String) As Long \nt~K}a 'f!U[Qatg ReadFile = -1 Z6rhInIY Dim oFSO As Object j)2I+[aoB Set oFSO = CreateObject("Scripting.FileSystemObject") f4fBUZ^ A Erase lineArray Lo~;pvv fz\Q>u'T Dim fid As Long 'S1u@p,q If oFSO.fileexists( fileName ) Then :{2~s fid = FreeFile() o]~\u{o#. Open fileName For Input As fid Km;}xke6 lineArray = Split(Input(LOF(fid), fid), vbCrLf) +rJ6DZ Close fid <(q(5jG End If #D4 Set oFSO = Nothing QXZyiJX} Return UBound( lineArray ) p_h/hTi 4SZ,X^]I> End Function Bl*}*S PU $8)XN-%( Sub GetFileList( ByVal in_dir As String, _ X3\PVsH$K ByRef in_flist() As String ) "~5cz0
H3v F)(^c 'Redimension the file list array H;
NV?CD Erase in_flist R7/S SuG6\ vY-CXWC7 'Tracks how many files are found `^Vd* Dim fCount As Long n&njSj/ fCount = 0 )Cl>% 9 O|V0WiY< 'Recurse directory and search for text files uhh7Ft#H Dim f As String )A$"COM4 f = Dir$(in_dir & "*.txt") mUa#sTm While f <> "" &h0LWPl ReDim Preserve in_flist(fCount) b)<WC$" in_flist(fCount) = f N<9 c/V fCount += 1 l!f_ +lv f = Dir$() +Yc^w5 !( Wend /[<F
f ReDim Preserve in_flist(fCount-1) v-tI`Qpb SO=gG 2E End Sub `9co7[Z
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