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摘要: yw1Xxwc uO1^nK 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。 ZP-9KA$" ,uO_C(G/i 背景:
YdUcO.V Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 fA=Lb^,M FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 `'gcF}); 图1. RPC Photonics工程漫射体结构及光束投射形状 XinKG<3! vFeR)Ox's 9E|QPT 步骤 jc@=
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q 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 1[-`*Ph ,wy;7T>ODd 图2. RPC Photonics工程漫射体不同类型的散射数据 j HObWUX 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) @X=sfygk 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 LxiN9 例如下所示: D&]xKx Sample name: EDF-C1-56 /;xrd\du Merging data from file EDF-C1-56 0-0.txt vG=Pi'4XXo Finished merging RPC data for sample EDF-C1-56 NGZtlNvh FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt *z_`$Y 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 =FdFLrx~l a. 创建一个新的散射库 e-.(O8 b. 散射模型命名 h]IoH0/ c. 改变散射模型为“Tabulated BSDF”. UF@. 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 ) A;f)`i0l, 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。 S&;)F|-q 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, 579t^"ja~ g. 点击OK Y^|15ek 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 a
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-aLBAxy 4`7~~:W!M5 脚本代码: ETR7%0$r hqwsgJ
'#Language "WWB-COM" 8v)HTD/C @Y+kg Option Explicit ]{I>HA5[ U@(8)[?nxn Sub Main c)q=il7ef
uwt29 'Cleanup =c]We:I ClearOutputWindow() TP Y&O{q 0/cgOP!^ Print "Merging RPC Photonics BSDF Data Files" !A14\ SetTextColor(255,0,0) D hk$e
Print "Note: Script should be located in the same folder as the BSDF TXT files." MR,A{X Print "Note: Do not run this script multiple times without deleting the output file between executions." pTJ_DH SetTextColor(0,0,0) J|cw9u `];ne]xM 'Current directory of this script (should be the same as the text files being merged) HD,6 Dim cDir As String V=+p8nE0 cDir = MacroDir$ & "\" "`'+@KlE DYew6B- 'Array which will be populated with the list of files to be merged O_5;?$[m Dim fList() As String, curFile As String xx?0Ftuq GetFileList( cDir, fList ) H/*i-%]v+(
P# ;pQC Print "" J>nta?/,X Print "Files found for merging:" h}S2b@e| For Each curFile In fList Q1H.2JXr Print Chr(9) & curFile 5F:\U Next XD[9wd5w8 dp3TJZ+U 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. [ .3Gb}B Dim nameArray() As String, sampName As String #!rH}A>n+ nameArray = Split(fList(0)," 0-0.txt") cc"<H}g>` sampName = nameArray(0) i_I` Print "" f_:>36{1^! Print "Sample name: " & Chr(9) & sampName "`w*-O A~LTi 'Open an output file and write the FRED header data *LvdrPxU= Dim outFile As String 9,}Z1 f\% outFile = cDir & sampName & "_FRED.txt" 5+)_d%v=6! Open outFile For Output As #1 'qeUI}[ Print #1, "type bsdf_data" S:c
lyx Print #1, "format angles=deg bsdf=value scale=1" )EN,Ry -3XnUGK 'Loop the file list, skip the two header lines and write the remaining data to file CT|H1Ry2T Dim lineArray() As String, curLine As Long "7?x aGh8 For Each curFile In fList rhN"#? Print "Merging data from file " & curFile -BsZw.
7P ReadFile( cDir & curFile, lineArray ) 7 S%`]M4; For curLine = 2 To UBound(lineArray) zEeix,IU Print #1, lineArray(curLine) .;D' Next :vC+}.{p Next g
G|4+' t pf3- 'Close the output file HZ\=NDz Close #1 W7IAW7w8U X)8Edw[?N3 Print "Finished merging RPC data for sample " & sampName >DW%i\k1V~ Print "FRED formatted data file: " & Chr(9) & outFile #|Je%t}~ End Sub 14y>~~3C4 BkDq9> 'Utility function to read the contents of a file into an array of strings. K%/g!t) Function ReadFile(ByVal fileName As String, _ X`I=Z ysB ByRef lineArray() As String) As Long HA0yX?f] AgdU@&^ ReadFile = -1 y<y9'tx Dim oFSO As Object Btc[ Set oFSO = CreateObject("Scripting.FileSystemObject") QW%xwV?8 Erase lineArray @9MrTP }oii|=,#^ Dim fid As Long C,{ Ekbg If oFSO.fileexists( fileName ) Then |:d_IB@ fid = FreeFile() e#?rK=C?9 Open fileName For Input As fid "%=K_WJ? lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0fR?zT? Close fid \(1WLP$2U End If Z0Qh7xWve Set oFSO = Nothing AE%zqvp> Return UBound( lineArray ) J
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96|F End Function {d,^tG} 4Y@q.QP Sub GetFileList( ByVal in_dir As String, _ d,t'e? ByRef in_flist() As String ) v<?k$ e5 'Ub\8<HfJU 'Redimension the file list array FsfP^a Erase in_flist N3Z6o.k BCr*GtR)W 'Tracks how many files are found @ds.)sKA> Dim fCount As Long Wt!NLlN8 fCount = 0 &>hln<a> L4Si0 K 'Recurse directory and search for text files 4[K6 ZDBU Dim f As String ;3sJ7%`v f = Dir$(in_dir & "*.txt") iIg99c7/&9 While f <> "" @]%cUjQ ReDim Preserve in_flist(fCount) U6_GEBz~y in_flist(fCount) = f q.p.y0 fCount += 1 \J{%xW> f = Dir$() luO4ap]* Wend h/#s\>)T ReDim Preserve in_flist(fCount-1) 74%Uojl" /k^O1+]H End Sub Uj~
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