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摘要: KnGTcoXg_ Y1)!lTG 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。 Z+4D.bA X:|8vS+0gU 背景: "hQgLG 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。 Su7bm1 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。 [ *>AN7W 图1. RPC Photonics工程漫射体结构及光束投射形状 6~xBi(m`
s2REt$.q y t5H oy 步骤 .UQE{.? 0^3+P%(o@ 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 ]Y`Ib0$ $!B}$I;cd 图2. RPC Photonics工程漫射体不同类型的散射数据 #+k*1Jg 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) ac8P\2{" 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 ) #+^
sAO 例如下所示: esX)"_xf Sample name: EDF-C1-56 YlF%UPp Merging data from file EDF-C1-56 0-0.txt H43MoC Finished merging RPC data for sample EDF-C1-56 Mxl]"?z FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt R[jEvyD>( 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 b~w=v_[(I a. 创建一个新的散射库 }D;WN@], b. 散射模型命名 %IY``r)j c. 改变散射模型为“Tabulated BSDF”. (Un_!) 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 ) m@Rtlb 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。 =0
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, ;j%BK(5 g. 点击OK k[kju%i4 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Vsnuy8~k 8gy_Yj&{P [yS#O\$'e 脚本代码: [eUftr9&0 qfoD '#Language "WWB-COM" bZ1 78>J] !?!C'-ps Option Explicit SF*n1V3hx 8}s.Fg@tE Sub Main $I9qgDJ) >znRyQ~bM 'Cleanup yR;{ ClearOutputWindow() cyM-)r@YQV $F'>yop2b Print "Merging RPC Photonics BSDF Data Files" \S~Vx!9w SetTextColor(255,0,0) ACq7dLys,B Print "Note: Script should be located in the same folder as the BSDF TXT files." @]aOyb@ Print "Note: Do not run this script multiple times without deleting the output file between executions." 2L?!tBw?1 SetTextColor(0,0,0) uxaYCa? Yz$3;
'Current directory of this script (should be the same as the text files being merged) s?R2B)a Dim cDir As String ^BQrbY cDir = MacroDir$ & "\" 26vp1 @&|l^ 1 'Array which will be populated with the list of files to be merged :GpDg Dim fList() As String, curFile As String T"7~AbgNU GetFileList( cDir, fList ) A][fLlpr %ru;;h Print "" 4(Iplo*Ys@ Print "Files found for merging:" M-V&X&?j For Each curFile In fList c(;a=n(E# Print Chr(9) & curFile *jIqAhs0{ Next v[e:qi&fG Z_1U9+, 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. a]
= Dim nameArray() As String, sampName As String U-/{0zB nameArray = Split(fList(0)," 0-0.txt") .
\ sampName = nameArray(0) } :=Tm]S Print "" OCZaQ33 Print "Sample name: " & Chr(9) & sampName YQJ==C1 h\v'9 'Open an output file and write the FRED header data ;2'q_Btk4 Dim outFile As String .
8N.l^0, outFile = cDir & sampName & "_FRED.txt" om?-WJI Open outFile For Output As #1 =0uAE7q(9 Print #1, "type bsdf_data" <S?ddp2 Print #1, "format angles=deg bsdf=value scale=1" ]e.JNo AL#4_]m' 'Loop the file list, skip the two header lines and write the remaining data to file
`\Hf]b Dim lineArray() As String, curLine As Long 4vBL6!z:Z For Each curFile In fList \%^%wXfp Print "Merging data from file " & curFile ;22oY>w ReadFile( cDir & curFile, lineArray ) {pM?5"MMJ For curLine = 2 To UBound(lineArray) ?T+q/lt4 Print #1, lineArray(curLine) 7i&:DePM'q Next y6]vl=^L Next a:QDBS2Llv \]$IDt(s 'Close the output file ys 5&PZg* Close #1 UfS%71l.$ ]?*I9 Print "Finished merging RPC data for sample " & sampName 9]q:[zm^ Print "FRED formatted data file: " & Chr(9) & outFile o sKKt?^? End Sub |2{wG4 M1KqY: 9E 'Utility function to read the contents of a file into an array of strings. >jD[X5Y Function ReadFile(ByVal fileName As String, _ ,#pXpAz/ ByRef lineArray() As String) As Long }.s~T#v E[Cb|E ReadFile = -1 Z+@2"%W Dim oFSO As Object x?&$ ci Set oFSO = CreateObject("Scripting.FileSystemObject") zOQ>d|p?X Erase lineArray "etPT@gF O)vp~@| Dim fid As Long E*+{t~ If oFSO.fileexists( fileName ) Then fW?o@vlO fid = FreeFile() ..rOsg{ Open fileName For Input As fid VkZ7# lineArray = Split(Input(LOF(fid), fid), vbCrLf) +SwR+H)? Close fid KEWTBBg End If BCA&mi3q Set oFSO = Nothing &RfC"lc Return UBound( lineArray ) P#AW\d^"B 8@tV9+u End Function =Q\r?(Iy aA,!<^&} Sub GetFileList( ByVal in_dir As String, _ yj\Nkh ByRef in_flist() As String ) :Y [LN >p"c>V& 8 'Redimension the file list array Dd\jHF>u Erase in_flist 4ecP*g F]<Xv" 'Tracks how many files are found (SvWvm Dim fCount As Long =zz~kon9 fCount = 0 >D4#y ,N)/w1?I 'Recurse directory and search for text files O&Y*pOg Dim f As String /HaHH.e f = Dir$(in_dir & "*.txt") xoN3 While f <> "" 9gmW&{6q ReDim Preserve in_flist(fCount) RNe^;
B in_flist(fCount) = f 6ZP"p<xX fCount += 1 \ZkA>oO". f = Dir$() BBev< Wend maNl^i ReDim Preserve in_flist(fCount-1) 5rU[Tir r4SXE\
G End Sub X<I+&Zi
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