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摘要: eC1cE MW p^. 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_TG"^{W $,
=n 背景: ON=xn|b4 Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 Y A;S'dxY FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 MPT[f 图1. RPC Photonics工程漫射体结构及光束投射形状 5L4~7/kj H}:apRb t+vn.X+& 步骤 sl)_HA7G w_9:gprf 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 ?^yZVmAo] HMBxj($eR 图2. RPC Photonics工程漫射体不同类型的散射数据 U'@_fg 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) c=ZX7U 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 %DiZ&}^Ck 例如下所示: Jx'p\* Sample name: EDF-C1-56 1{DHlyA6g Merging data from file EDF-C1-56 0-0.txt j88H3bi0 Finished merging RPC data for sample EDF-C1-56 A }dl@ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt G $?VYC8; 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 /9[nogP a. 创建一个新的散射库 ecr pv+ b. 散射模型命名 [u~#F,_ow c. 改变散射模型为“Tabulated BSDF”. B=9|g1e d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ')go/y`YK e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ,cpPXcz ?, f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, YncY_Hu g. 点击OK lGs fs( 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 8TuOf(qE #.) qQ8*( 7XdLZ4ub 脚本代码: u+S*D\p<` f4uK_{ '#Language "WWB-COM" ]` 3;8, [Q)lJTs Option Explicit `57ffQR9 GCc@
:*4[ Sub Main QarA.Ne~ "Sl";. 'Cleanup JgEpqA12 ClearOutputWindow() L7 qim.J _t3n< Print "Merging RPC Photonics BSDF Data Files" ]_j{b)t SetTextColor(255,0,0) J5IQ Print "Note: Script should be located in the same folder as the BSDF TXT files." "M2HiV Print "Note: Do not run this script multiple times without deleting the output file between executions." {ImZ><xe/ SetTextColor(0,0,0) DN!:Rm uc Ao 1*a%-. 'Current directory of this script (should be the same as the text files being merged) 7+@:wX\ Dim cDir As String w,D(zk$ cDir = MacroDir$ & "\" #m|AQr| v dyu =*Y 'Array which will be populated with the list of files to be merged zZseK Dim fList() As String, curFile As String ]M>mwnt+ GetFileList( cDir, fList ) ,D>$N3; Hb IRE Print "" 7 zK%CJ Print "Files found for merging:" Q+gQ"l,95 For Each curFile In fList 'Aai.PE: Print Chr(9) & curFile |no '^ Next =p:D_b #\o
VbVq 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 1+v)#Wj Dim nameArray() As String, sampName As String b4i=eI8 nameArray = Split(fList(0)," 0-0.txt") DTPYCG&% sampName = nameArray(0) #%Uk}5;- Print "" sZ7{_}B Print "Sample name: " & Chr(9) & sampName !bS:!Il9= T/UhZ4(V 'Open an output file and write the FRED header data 4)i/B99k Dim outFile As String rl[&s\[ outFile = cDir & sampName & "_FRED.txt" g.zJ[- Open outFile For Output As #1 K6{{\r Print #1, "type bsdf_data" 2t*@P"e! Print #1, "format angles=deg bsdf=value scale=1" 0k0y'1SL R"VmN2 'Loop the file list, skip the two header lines and write the remaining data to file u.gnvdU Dim lineArray() As String, curLine As Long -BgzAxa For Each curFile In fList ) j_g*< Print "Merging data from file " & curFile ;}ileLTl ReadFile( cDir & curFile, lineArray ) s-~Tf| For curLine = 2 To UBound(lineArray) xm6cn\e Print #1, lineArray(curLine) V)oUSHillH Next }L3k pw Next |#Z:v1]" f)~urGazS 'Close the output file 1zl6Rwk^o Close #1 KAT4C 4=, JFIUD{>fp Print "Finished merging RPC data for sample " & sampName AbC/ Print "FRED formatted data file: " & Chr(9) & outFile ^?VYE26 End Sub {Ug?k<h7| Kzfa4C 'Utility function to read the contents of a file into an array of strings.
%tT&/F Function ReadFile(ByVal fileName As String, _ !Y8us" ByRef lineArray() As String) As Long PTXy:>]M a=+qR:wT ReadFile = -1 }E+#*R3auB Dim oFSO As Object `B}(Ln Set oFSO = CreateObject("Scripting.FileSystemObject") N=YRYUo Erase lineArray 9s8B>(L $WI=a-;_e Dim fid As Long %qfql If oFSO.fileexists( fileName ) Then DJ2EV^D+P fid = FreeFile() SxdH%agM Open fileName For Input As fid A]id*RtY lineArray = Split(Input(LOF(fid), fid), vbCrLf) {L$ ]NQdz Close fid .^6"nnfA# End If ] cdKd ) Set oFSO = Nothing nlQ<Aa-% Return UBound( lineArray ) +1zCb=;!{ ,A
T!:&<X End Function Mhc!v, D$ wu"6Kyu Sub GetFileList( ByVal in_dir As String, _ jO)UK.H# ByRef in_flist() As String ) m_LW<' .H
{ 'Redimension the file list array BFmd`#{l Erase in_flist l8/ tR {{7%z4l 'Tracks how many files are found 2It$ bz Dim fCount As Long I0trHrX9 fCount = 0 fOs"\Y4 RsIR}.* 'Recurse directory and search for text files -'*\KA@u Dim f As String #05#@v8.f f = Dir$(in_dir & "*.txt") (\}>+qS[ While f <> "" k7yQEU ReDim Preserve in_flist(fCount) tkx1iBW= in_flist(fCount) = f z;yb;), fCount += 1 ~0aWjMc(> f = Dir$() Hg\+:}k&9 Wend xs_l+/cZ ReDim Preserve in_flist(fCount-1) mZDL=p ;$gZ?& End Sub (F@.o1No%
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