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摘要: \eN }V {9(N?\S1`a 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。 a}6Wo= m$]?Jq 背景: .^/OL}/~< 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。 <|v]9`' 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。 &TKB8vx=# 图1. RPC Photonics工程漫射体结构及光束投射形状 $N~8^6 +ft?aB@ ;#AV~Y-
s 步骤 dD=dPi# |',Gy\Sj 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 J5429Soo i),W1<A1 图2. RPC Photonics工程漫射体不同类型的散射数据 l/Sb JrM* 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) .Ir 5gz 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 >XBLm`a 例如下所示: t'^/}=c- Sample name: EDF-C1-56 !iMsTH<
Merging data from file EDF-C1-56 0-0.txt y:xZ(RgfF Finished merging RPC data for sample EDF-C1-56 `U)~fu/\2M FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt cO'
\s 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 <~'\~Z d+ a. 创建一个新的散射库 yKi* 8N"e< b. 散射模型命名 A%pcPzG; c. 改变散射模型为“Tabulated BSDF”. _Y=>^K]9K d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) O.}{s; e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 (Ori].{C.J f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, G> "w$Us g. 点击OK 4\>Cnc{ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 :dK/}S0 q* +}wP
'RXhE 脚本代码: PC/Oo~Gx >osY?9 '#Language "WWB-COM" sT| 8a OT+LQ TE Option Explicit u[})|x*N c5pF?kFaD Sub Main &;|/I`+ Eb[*nWF= 'Cleanup J&wrBVv1uk ClearOutputWindow() iCnKQG
LGV"WE Print "Merging RPC Photonics BSDF Data Files" ?(H/a-(:v} SetTextColor(255,0,0) QYPsqkF* Print "Note: Script should be located in the same folder as the BSDF TXT files." x8w455 Print "Note: Do not run this script multiple times without deleting the output file between executions." eVS6#R]'m SetTextColor(0,0,0) h,45-#+ NZ7g}+GTG 'Current directory of this script (should be the same as the text files being merged) oIN!3 Dim cDir As String b 'jZ4{+W cDir = MacroDir$ & "\" ZG3u Z+x,Awq 'Array which will be populated with the list of files to be merged h@&&.S`B Dim fList() As String, curFile As String x[zt(kC0+ GetFileList( cDir, fList ) ,E<(K8 /^SIJS@^`> Print "" [2:Q.Zj Print "Files found for merging:" vvwNJyU- For Each curFile In fList qS:hv&~ Print Chr(9) & curFile E0[ec6^qwY Next yHsmX2s 9ePG-=5I 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. gs7h`5[es Dim nameArray() As String, sampName As String ~dg7c{o5 nameArray = Split(fList(0)," 0-0.txt") Cz` !j sampName = nameArray(0) Bvb.N$G Print "" @m[q0G} Print "Sample name: " & Chr(9) & sampName BIqZg$ ihS;q6ln 'Open an output file and write the FRED header data ;EDc1: Dim outFile As String %ukFn
&-2@ outFile = cDir & sampName & "_FRED.txt" pUi|&F K"> Open outFile For Output As #1 CY"&@v1 Print #1, "type bsdf_data" j51Wod<[ Print #1, "format angles=deg bsdf=value scale=1" 0]p!
Bscaf VC$,Y 'Loop the file list, skip the two header lines and write the remaining data to file hH_&42E6 Dim lineArray() As String, curLine As Long =:Ahg
9 For Each curFile In fList 6aRPm% Print "Merging data from file " & curFile TrD2:N}dI ReadFile( cDir & curFile, lineArray ) [$:M/5y9 For curLine = 2 To UBound(lineArray) 5n{J}0C Print #1, lineArray(curLine) B)>r~v] Next 8`~M$5! Next R9bsl.e HtY0=r 'Close the output file )IQ5Qu Close #1 rKxIOJ ,T $De1 4 Print "Finished merging RPC data for sample " & sampName wiHGTaR Print "FRED formatted data file: " & Chr(9) & outFile vMG >Xb End Sub ts|dk% nIc:<w] 'Utility function to read the contents of a file into an array of strings. a_}k^zw( Function ReadFile(ByVal fileName As String, _ b/;!yOF ByRef lineArray() As String) As Long ,6TF]6: $$'a ReadFile = -1 gJ;jh7e@ Dim oFSO As Object WRIOj Q: Set oFSO = CreateObject("Scripting.FileSystemObject") P5;n(E(19 Erase lineArray vfBIQfH f+3ico]f@ Dim fid As Long !'m
MGxkEb If oFSO.fileexists( fileName ) Then 9NzK1V0X fid = FreeFile() ' b?' u Open fileName For Input As fid DNTkv_S lineArray = Split(Input(LOF(fid), fid), vbCrLf) p>x[:* Close fid gbf2ty End If cl2+,!: Set oFSO = Nothing QEtf-xNn^ Return UBound( lineArray ) -o:
ifF| tFj[>_d7 End Function Hg[g{A_G[ R;yi58Be Sub GetFileList( ByVal in_dir As String, _
%PF:OB6[| ByRef in_flist() As String ) ''.P= (_2Iu%F 'Redimension the file list array M( euwy Erase in_flist H| UGR~& /xS4>@hn 'Tracks how many files are found 3jeB\ Dim fCount As Long &>%R)?SZh fCount = 0 MawWgd* [- Xz: 'Recurse directory and search for text files Wb)>APL Dim f As String [l`_2{: f = Dir$(in_dir & "*.txt") @$:T]N3m While f <> "" 6(M^`&fl ReDim Preserve in_flist(fCount) 8VWkUsOoI in_flist(fCount) = f
WRdBL5 fCount += 1 yiT)m]E
d f = Dir$() 40?xu#" Wend -=;V*; ReDim Preserve in_flist(fCount-1) 85{2TXQ^%= T{A5,85 End Sub U<|hIv-& 6x]x>:8 `S)*(s?T QQ:2987619807 h=a-~= 8
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