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摘要: ]V36-%^ t7w-TJvP 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。 6<x~Mk'u) gA~20LSt 背景: wMb)6YZs 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。 1,"I= 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。 zL:&Q< 图1. RPC Photonics工程漫射体结构及光束投射形状 :}y9$p
#NvQmz?J? &?.n2+T+
= 步骤 3 p/b D]IBB>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。 fdlvn*H 6'xomRpYN 图2. RPC Photonics工程漫射体不同类型的散射数据 qWsylC23 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) m\>|C1oRy 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 EL^8zyg%% 例如下所示: ZgV~W#t Sample name: EDF-C1-56 'lJEHz\ Merging data from file EDF-C1-56 0-0.txt vQ:wW',i Finished merging RPC data for sample EDF-C1-56 .L9']zXc` FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt =p<?Hu 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 7~_I=- a. 创建一个新的散射库 9-0<*)"b> b. 散射模型命名 pzp,t(%j c. 改变散射模型为“Tabulated BSDF”. 1/B]TT 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 ) n( g)UNx 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。 L}'Yd' 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, *7ZGq(O g. 点击OK V=pMq?Nr 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 UMV)wy|j
#j;Tb2&w F{<5aLaYti 脚本代码: ? ^M
/[@ {esJ=FV\ '#Language "WWB-COM" >F1G!#$0 x^G'rF"nT Option Explicit xc9YM0B& U-i.(UyZ Sub Main "~F3*lk#E 7R}9oK_I 'Cleanup 4({(i ClearOutputWindow() AS)UJ/lC $ a? Print "Merging RPC Photonics BSDF Data Files" 0}{'C5 SetTextColor(255,0,0) :\XI0E Print "Note: Script should be located in the same folder as the BSDF TXT files." ui:= Print "Note: Do not run this script multiple times without deleting the output file between executions." k1)%.pt% SetTextColor(0,0,0) NzQ9Z1Mxy bLzs?eos 'Current directory of this script (should be the same as the text files being merged) ^W~p..DF Dim cDir As String S}(8f!9< cDir = MacroDir$ & "\" Z$p0&~ k.<3HU 'Array which will be populated with the list of files to be merged y<pnp?x4 Dim fList() As String, curFile As String "-31'R- GetFileList( cDir, fList ) QT!
4[,4 ]1D%zKY%$Z Print "" (D<(6? Print "Files found for merging:" `s|]"'rX For Each curFile In fList &?0:v`4Y Print Chr(9) & curFile *wuqa)q2 Next F>zl9Vi< O~!T3APGU 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. {`(>O"_[Q Dim nameArray() As String, sampName As String t42u b nameArray = Split(fList(0)," 0-0.txt") -'`TL$ sampName = nameArray(0) >@_im6 Print "" .f:n\eT): Print "Sample name: " & Chr(9) & sampName <F;v`h|+S uI~s8{0T6 'Open an output file and write the FRED header data 20b<68h$: Dim outFile As String 0V$k7H$Z outFile = cDir & sampName & "_FRED.txt" BecPT Open outFile For Output As #1 LJFG0 W Print #1, "type bsdf_data" W#'c5:m
4 Print #1, "format angles=deg bsdf=value scale=1" %ft &Q YAVy9$N- 'Loop the file list, skip the two header lines and write the remaining data to file 0p(L' Dim lineArray() As String, curLine As Long b0v:12q For Each curFile In fList T f4tj!t- Print "Merging data from file " & curFile >(r{7Qg ReadFile( cDir & curFile, lineArray ) /ASaB For curLine = 2 To UBound(lineArray) b| M3` Print #1, lineArray(curLine)
mO*^1 Next :O-iykXyI Next t23'x0l z'7[T ie 'Close the output file K4Sk+
v Close #1 :~F :/5 (#D*Pl Print "Finished merging RPC data for sample " & sampName vxFTen{-F Print "FRED formatted data file: " & Chr(9) & outFile 6E~g# (8 End Sub G7GZDi )+P]Vf\jH 'Utility function to read the contents of a file into an array of strings. G{Yz8]m Function ReadFile(ByVal fileName As String, _ {ZU1x C ByRef lineArray() As String) As Long ({s6eqMhDd /./"x~@ ReadFile = -1 g{IF_ 1 Dim oFSO As Object uo\ .7[1
Set oFSO = CreateObject("Scripting.FileSystemObject") [XVEBA4GI Erase lineArray tVuWVJ4M +Hvc_Av'' Dim fid As Long )s_n If oFSO.fileexists( fileName ) Then ,`D~py, fid = FreeFile() a"N4~?US Open fileName For Input As fid ldha|s.* lineArray = Split(Input(LOF(fid), fid), vbCrLf) $+JS&k/'m Close fid O.aG[wm8 End If d^03"t0O] Set oFSO = Nothing W%<LTWOc Return UBound( lineArray ) (jjTK'0[ ?eH&'m}- End Function F{06 _T Snp|!e Sub GetFileList( ByVal in_dir As String, _ l^GP3S ByRef in_flist() As String ) }%b;vzkG5 IV%zO+ 'Redimension the file list array 9.'h^#C Erase in_flist '* mH*?Y De7Ts 'Tracks how many files are found ^;!0j9"*: Dim fCount As Long 2M#M"LHo fCount = 0 glD cUCF3 lC:k7<0Ji 'Recurse directory and search for text files Lbe\@S Dim f As String vEf4HZ&w f = Dir$(in_dir & "*.txt") V7#v6!7A@ While f <> "" GjoIm? ReDim Preserve in_flist(fCount) )u))n# P in_flist(fCount) = f |,9JNm$ fCount += 1 4XVCHs( f = Dir$() zvABU+{jD Wend V5+SWXZ ReDim Preserve in_flist(fCount-1) @SCI"H%[ %ZHP2j
%~ End Sub c/c$D;T
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