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摘要: %%g-GyP
1 u.6P-yh 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。 :):zNn_>` d5U; $q{o 背景: M#0 @X Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 J_ V,XO FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ^g!B.ll` 图1. RPC Photonics工程漫射体结构及光束投射形状 #@_1fE NfF~dK| (fXq<GXAn/ 步骤 ~Fx&)kegTo J E)J<9gf 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 YsAF{ ?~)Ak`= 图2. RPC Photonics工程漫射体不同类型的散射数据 ?'2 v.5TQt 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) |s`Kd-'|q 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 k!13=Gh 例如下所示: ; J2-rh Sample name: EDF-C1-56 'rx?hL3VW Merging data from file EDF-C1-56 0-0.txt WF)s*$'uz; Finished merging RPC data for sample EDF-C1-56 0P9Wy!f7 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt n2E4!L|q 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 KnFQ)sX^ a. 创建一个新的散射库 1"$R 3@s; b. 散射模型命名 k5s ?lWH c. 改变散射模型为“Tabulated BSDF”. -aN":?8(G d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ,TJ/3_ lH e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 X X&K=<,Ja f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, xSOoIsL[ g. 点击OK TMY{OI8 a 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Mz}i[|U\
wQw-:f- zP|*(* 脚本代码: 7%YYr^d UU"d_~pp '#Language "WWB-COM" xiJz`KD& 7 BK46x Option Explicit 'XEK&Yi1 FSVS4mtiX\ Sub Main gb9[Meg' hOl=W |)v 'Cleanup pr)K{~m]{< ClearOutputWindow() CHg]U l Jtpa@!M Print "Merging RPC Photonics BSDF Data Files" |9x%gUm SetTextColor(255,0,0) ?{n>EvLY Print "Note: Script should be located in the same folder as the BSDF TXT files." 4%%B0[Wo_O Print "Note: Do not run this script multiple times without deleting the output file between executions." 8 `o{b"l+ SetTextColor(0,0,0) ]|;7R^o3| 4 ;^g MI9 'Current directory of this script (should be the same as the text files being merged) nxD'r Dim cDir As String bD d_} cDir = MacroDir$ & "\" 7<fL[2- Wf_CR( 'Array which will be populated with the list of files to be merged dRHlx QUn Dim fList() As String, curFile As String i+U@\:= GetFileList( cDir, fList ) _jiQL66pY P_v0))n{ Print "" _F3KFQ4,S- Print "Files found for merging:" ^zKt{a For Each curFile In fList Ck:#1-t8{ Print Chr(9) & curFile ip<15;Z Next id3)6} fm[_@L%
x 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. te4F"SEf Dim nameArray() As String, sampName As String };i&a%I| nameArray = Split(fList(0)," 0-0.txt") F\zkyk4 sampName = nameArray(0)
{VS''Lv Print "" =U=e?AOG2 Print "Sample name: " & Chr(9) & sampName w:ORmR.p @][ a8:Y9I 'Open an output file and write the FRED header data =X)Q7u".7 Dim outFile As String -J-3_9I outFile = cDir & sampName & "_FRED.txt" vsu@PuqH Open outFile For Output As #1 e$ThSh\+( Print #1, "type bsdf_data" [q|?f?Zl Print #1, "format angles=deg bsdf=value scale=1" YgO aZqN - 3C* P
'Loop the file list, skip the two header lines and write the remaining data to file c-[Q,c Dim lineArray() As String, curLine As Long <$RS*n For Each curFile In fList fO[Rf_ Print "Merging data from file " & curFile JZs|~@ ReadFile( cDir & curFile, lineArray ) 73'U#@g6 For curLine = 2 To UBound(lineArray) l81&[ Print #1, lineArray(curLine) %GVEY Next ~C}(\8g Next &:;/]cwj n@G:e-m{A 'Close the output file kS@9c _3S Close #1 A6@+gP< ?&whE! Print "Finished merging RPC data for sample " & sampName -_y~rx
> Print "FRED formatted data file: " & Chr(9) & outFile 7bgnZ]r8t End Sub Q\&AlV y8<lp+ 'Utility function to read the contents of a file into an array of strings. G=r(SJq Function ReadFile(ByVal fileName As String, _ ^
I{R[O'8 ByRef lineArray() As String) As Long (hhdbf iFAoAw( ReadFile = -1 O4 +SD Dim oFSO As Object eEZ|nEU Set oFSO = CreateObject("Scripting.FileSystemObject") @&~OB/7B: Erase lineArray Y(#d8o}}# t7U,AQ=;P5 Dim fid As Long *@\?}cX If oFSO.fileexists( fileName ) Then J[<D/WIH fid = FreeFile() wu&|~@_s@ Open fileName For Input As fid P+*rWJ8gQ lineArray = Split(Input(LOF(fid), fid), vbCrLf) +(QMy&DtS Close fid +LQs.* End If eI/\I:G{f Set oFSO = Nothing (/9.+V_ Return UBound( lineArray ) r|JiGj^om "lv:hz End Function e-Ybac% wB1|r{ Sub GetFileList( ByVal in_dir As String, _ <6}f2^ ByRef in_flist() As String ) ={mPg+Ei' 3IJI5K_ 'Redimension the file list array y
8d`}, Erase in_flist X>@.-{6T ^7s6J{< 'Tracks how many files are found zfr (dQ Dim fCount As Long Qq FfR# fCount = 0 !s[j1=y Og;$P'U 'Recurse directory and search for text files GdfKxSO Dim f As String E/L?D f = Dir$(in_dir & "*.txt") QkCoW[sn While f <> "" XvzV
lKL ReDim Preserve in_flist(fCount) Xv5Ev@T in_flist(fCount) = f c@o/Cv fCount += 1 dS;|Kl[Om f = Dir$() MBYD,v& Wend 1O3<%T#LOZ ReDim Preserve in_flist(fCount-1) Alk*
"p [>Kxm End Sub RJ@e5A6_
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