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摘要: B}?/oZW4 Sfvi|kZX 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。 FE_n+^|k< `qfVgT=2 背景: VvoJ85 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。 lGcHfW)Y 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。 y XS/3_A{ 图1. RPC Photonics工程漫射体结构及光束投射形状 _~_Hup qv,|7yw{ kB~: HQf 步骤 (:hPT-1 q.g!WLiI 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。 9Y/c<gbY f'#7i@Je 图2. RPC Photonics工程漫射体不同类型的散射数据 v4qvqGK 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) @l@lE0 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 z:fd'NC 例如下所示: gzC\6ca Sample name: EDF-C1-56 d<Z`)hI{K Merging data from file EDF-C1-56 0-0.txt
NghQ#c Finished merging RPC data for sample EDF-C1-56 @AyC0} FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt O ^e
!<bBd 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 wuh$=fya a. 创建一个新的散射库 ^ qE4:|e b. 散射模型命名 Mr`u!T&sc c. 改变散射模型为“Tabulated BSDF”. #}B~V3UD d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) +J#H9>To! e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 52:oe1-8 f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, :jUd?( g. 点击OK lSbAZ6 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Qp-nr] 3z5,4ps ]" )i~-|R 脚本代码: Fd ]! 7 a Y{E'K= '#Language "WWB-COM" LoTq2 / !>2s5^JI9 Option Explicit ZegsV| A70_hhP Sub Main n#x{~oQc AWf zMJ;VS 'Cleanup Z0-W%W ClearOutputWindow() a_pkUOu6 [#)$BXG~y Print "Merging RPC Photonics BSDF Data Files" d;'@4NX5+ SetTextColor(255,0,0) blS*HKw Print "Note: Script should be located in the same folder as the BSDF TXT files." m_St"`6 . Print "Note: Do not run this script multiple times without deleting the output file between executions." j)J4[j SetTextColor(0,0,0) ;
/EH@V| E8?Q>%_ 'Current directory of this script (should be the same as the text files being merged) @gTpiV2 Dim cDir As String R;,&CQUl cDir = MacroDir$ & "\" OBj.-jL X|8Yz3:o 'Array which will be populated with the list of files to be merged }TYCF@ Dim fList() As String, curFile As String D* Vr)J GetFileList( cDir, fList ) o'yR^` J .El&Dev Print "" 3xj<ATSe Print "Files found for merging:" {Y
IVHl For Each curFile In fList <Q szmE Print Chr(9) & curFile D./e|i? Next -|V@zSKr3 ayC*n' 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ]C]tLJ!M Dim nameArray() As String, sampName As String 5*4P_q(AxD nameArray = Split(fList(0)," 0-0.txt") T0aK1Lh sampName = nameArray(0) bt~-=\ Print "" ^t#]E# Print "Sample name: " & Chr(9) & sampName NO6. qWl abI[J]T9G 'Open an output file and write the FRED header data ,`H=%# Dim outFile As String aeP4%h outFile = cDir & sampName & "_FRED.txt" #7'ww*+ Open outFile For Output As #1 @ZT25CD Print #1, "type bsdf_data" J }JT%SW Print #1, "format angles=deg bsdf=value scale=1" :X@;XEol~ >5]Xl*{H) 'Loop the file list, skip the two header lines and write the remaining data to file x}F.<` Dim lineArray() As String, curLine As Long 7E|0'PPR For Each curFile In fList x)V.^- Print "Merging data from file " & curFile ^\_`0%`> ReadFile( cDir & curFile, lineArray ) pY-izML For curLine = 2 To UBound(lineArray) Ry/NfF= Print #1, lineArray(curLine) #<se0CJB Next
!y*V;J Next (<1DPpy95O t F`>.= 'Close the output file (-"A5(X:/ Close #1 /\Q{i#v S, Oy}Nv Print "Finished merging RPC data for sample " & sampName -?@$`{-K Print "FRED formatted data file: " & Chr(9) & outFile >%d]"] End Sub l<v/T y(N-1 'Utility function to read the contents of a file into an array of strings. y)/d- Function ReadFile(ByVal fileName As String, _ nw\p3 ByRef lineArray() As String) As Long Gt- -7S d8Upr1_ ReadFile = -1 1eT| Dim oFSO As Object d(fgv Set oFSO = CreateObject("Scripting.FileSystemObject") t,MK#Ko Erase lineArray 5X~ko> a^sR?.+3 Dim fid As Long TTqOAo[-Z If oFSO.fileexists( fileName ) Then b6NttY!3 fid = FreeFile() )rj.WK. Open fileName For Input As fid L@G)K lineArray = Split(Input(LOF(fid), fid), vbCrLf) Jr1^qY`0+ Close fid R[#5E|` `9 End If ?g<*1N?: Set oFSO = Nothing Y&gfe8%5N Return UBound( lineArray ) P,wFib^1 Q~*A`h# End Function 7<N X;Fx oWJ}]ip Sub GetFileList( ByVal in_dir As String, _ w7%N=hL1 ByRef in_flist() As String ) .+B!mmp 3bPVKsY 'Redimension the file list array Vy(lyD<6 Erase in_flist SSI&WZ2a -j<UhW 'Tracks how many files are found gXf_~zxS Dim fCount As Long \,(t P:o fCount = 0 u1<xt1K $p9XXZ"* 'Recurse directory and search for text files 8q0f#/`v Dim f As String m"v` E7G f = Dir$(in_dir & "*.txt") g%\e80~1 ( While f <> "" ;$0za]x ReDim Preserve in_flist(fCount) "@ox= in_flist(fCount) = f ^?juY}rZ=| fCount += 1 T!;<Fy"p f = Dir$() }1$8)zH Wend Ex*g>~e ReDim Preserve in_flist(fCount-1) ,e>ugI_;* $G=\i>R. End Sub "4r5 n8 ~ 4&_$e! heh!cDK QQ:2987619807 VD=$:F]
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