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摘要: ;OfZEy>7 L% ?3VW 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。 Bwg\_:vq qI#ow_lL# 背景: JLH,:2 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。 j9/Ev]im|F 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。 mY !LGN 图1. RPC Photonics工程漫射体结构及光束投射形状 \]+57^8r Q XV8][
Y+'522er 步骤 Qv>rww] Wg
?P" 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。 f6zS_y9gn Z* L{; 图2. RPC Photonics工程漫射体不同类型的散射数据 JypXQC}~ 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) m5rJY/ 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 J}J7A5P 例如下所示: nH% 1lD?: Sample name: EDF-C1-56 Du."O]syD Merging data from file EDF-C1-56 0-0.txt 8'6$t@oT9w Finished merging RPC data for sample EDF-C1-56 ccu13Kr>E FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 7f\@3r 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 N"wp2w a. 创建一个新的散射库 %:WM]dc b. 散射模型命名 ;_hL c. 改变散射模型为“Tabulated BSDF”. I~.d/!>Z d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) nlkQ'XGAI e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 &\/b(|> f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, duk:: |{F g. 点击OK uepL"%.@7| 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 @Xb>GPVe#L I_h{n{,sr X ?l F,p 脚本代码: 1_z6O!rx Qo;#}%}^^ '#Language "WWB-COM" *b
>hZkObn ' N?t=A Option Explicit GxR, 3 f8'$Mn, Sub Main @lnM% +\ O[)\ 'Cleanup c&JYbq ClearOutputWindow() wuQ>|\Zs k;9"L90 Print "Merging RPC Photonics BSDF Data Files" s"solPw SetTextColor(255,0,0) )"o+wSI1 Print "Note: Script should be located in the same folder as the BSDF TXT files." qm&Z_6Pw Print "Note: Do not run this script multiple times without deleting the output file between executions." q
T pvz SetTextColor(0,0,0) 4fCg{ ef;Ta|# 'Current directory of this script (should be the same as the text files being merged) XN=Cq*3} Dim cDir As String X;?Z_3I:5 cDir = MacroDir$ & "\"
j{;RuNt k v}<u 'Array which will be populated with the list of files to be merged Iu -CXc Dim fList() As String, curFile As String ?$T39U^ GetFileList( cDir, fList ) khW9n* 9C{\=?e; Print "" Fc"&lk4e Print "Files found for merging:" F}lgy;=h For Each curFile In fList ]U,K]y[Bj Print Chr(9) & curFile l^IPN'O@ Next XI*_ti gAY%VFBP0 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. l?/.uNw Dim nameArray() As String, sampName As String ,OQ!lI_`R nameArray = Split(fList(0)," 0-0.txt") ~',}]_'oR- sampName = nameArray(0) |= frsf~? Print "" B!(t<W8cu Print "Sample name: " & Chr(9) & sampName ;^,2
Qs M epH48 )2 'Open an output file and write the FRED header data 4#qjRmt Dim outFile As String w$5N6 outFile = cDir & sampName & "_FRED.txt" (&6C,O~n^. Open outFile For Output As #1 $nOd4{s_ Print #1, "type bsdf_data" Hhbf9) Print #1, "format angles=deg bsdf=value scale=1" x\Y%/C[Kc ~Lc>~!!t 'Loop the file list, skip the two header lines and write the remaining data to file .=>T yq Dim lineArray() As String, curLine As Long `FImi9%F For Each curFile In fList I>27U<PX Print "Merging data from file " & curFile sX&M+'h ReadFile( cDir & curFile, lineArray ) NS
l$5E For curLine = 2 To UBound(lineArray) [LonY49 Print #1, lineArray(curLine) :8_`T$8i4 Next sQA{[l!aj Next c#G]3vTdE (jD..qMs# 'Close the output file 3_atv'I Close #1 (/_Q
r2KfC f/b }X3K Print "Finished merging RPC data for sample " & sampName F GOa!G Print "FRED formatted data file: " & Chr(9) & outFile vII8>x%* End Sub 0NSn5Hq oPNYCE 'Utility function to read the contents of a file into an array of strings. ~^.&nph Function ReadFile(ByVal fileName As String, _ v.1= TBh ByRef lineArray() As String) As Long >:]fN61# Siw9_c ReadFile = -1 6QRfju' Dim oFSO As Object ~MY(6P Set oFSO = CreateObject("Scripting.FileSystemObject") mm=Y(G[_%y Erase lineArray Xl6)& Z"gllpDr$ Dim fid As Long -aNTFt~|[ If oFSO.fileexists( fileName ) Then $Yz &x%Lb fid = FreeFile() =tcPYYD Open fileName For Input As fid ZW2#'$b lineArray = Split(Input(LOF(fid), fid), vbCrLf) b,a\`%m} Close fid ZZC=
7FB End If 4C/8hsn Set oFSO = Nothing ^BM/K&7^ Return UBound( lineArray ) +29;T0>a L>UYR++<6 End Function Jb-wvNJu ud:?~?j&w Sub GetFileList( ByVal in_dir As String, _ L1Q QU ByRef in_flist() As String ) l1cBY{3QD Wsz='@XvB 'Redimension the file list array fnnwe2aso Erase in_flist =zA=D.D2 |->y'V 'Tracks how many files are found ~+7yi4(i Dim fCount As Long 29ft!R>[ fCount = 0 o33{tUp' zFi+6I$ 'Recurse directory and search for text files wHZ!t,g Dim f As String `A
<yDy f = Dir$(in_dir & "*.txt") lO $M6l While f <> "" GP1>h.J ReDim Preserve in_flist(fCount) H[N&Wiq/| in_flist(fCount) = f )Qxv9:X fCount += 1 Y)u}+Yg f = Dir$() ^RWt Wend !v;r3*#Nky ReDim Preserve in_flist(fCount-1) h.=B!wKK /1li^</|p` End Sub 9jPb-I-
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