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摘要: T1bFxim#b 7~D`b1|| 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。 ;&q]X]bJ Z7oaQ\fR 背景: &<@%{h@= 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。 9j2\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。 (qbc;gBy 图1. RPC Photonics工程漫射体结构及光束投射形状 pKnIQa[c x.o3iN[= 7G2vYKC' 步骤 [*tU}9 mgxz1d 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。 \wFhTJY [m
%W:Ez 图2. RPC Photonics工程漫射体不同类型的散射数据 (]}XLMi,|! 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) =:;YTie 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 T*8_FR < 例如下所示: "s${!A) Sample name: EDF-C1-56 M",];h(I6( Merging data from file EDF-C1-56 0-0.txt v23TL Finished merging RPC data for sample EDF-C1-56 dw3'T4TC? FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt "`[ $&:~ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 -h=c=P a. 创建一个新的散射库 jXtLo,km b. 散射模型命名 (%.</|u c. 改变散射模型为“Tabulated BSDF”. ti+pUlVrM d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) vmMV n-\# e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ')r D?Z9 ^ f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, x)d2G6x g. 点击OK XQ4dohGCP 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 3JTU^ -S< 3/:LYvM< [rc'/@L 脚本代码: FDl,Ey^r/ ^971<B(v '#Language "WWB-COM" :C>J-zY EmF]W+!z% Option Explicit O.dux5lfBd p
FXd4* Sub Main ,b.kw}k eK\|SQb 'Cleanup X
E!2Q7Q9 ClearOutputWindow() t;oT {Hge on6<l Print "Merging RPC Photonics BSDF Data Files" >\RDQ%z SetTextColor(255,0,0) J6= w:c Print "Note: Script should be located in the same folder as the BSDF TXT files." t
CkoYrvT Print "Note: Do not run this script multiple times without deleting the output file between executions." DS.39NY SetTextColor(0,0,0) ,.J<.#D3J C:WtCAm( 'Current directory of this script (should be the same as the text files being merged) )`e^F9L Dim cDir As String 3x,Aczb cDir = MacroDir$ & "\" |dW2dQ O7! fI'R 'Array which will be populated with the list of files to be merged 2LtU;}7s Dim fList() As String, curFile As String 0c%@e2(N GetFileList( cDir, fList ) C#ZmgR nomu$|I Print "" jq7vOr-_g Print "Files found for merging:" Wdei`u[ For Each curFile In fList _-g-'Hr+N Print Chr(9) & curFile .ruqRGe/ Next rE!G,^_{ Vi Cg|1c 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. mjWp8i
Dim nameArray() As String, sampName As String !E4E' I=]N nameArray = Split(fList(0)," 0-0.txt") G~Sy&XJuq sampName = nameArray(0) &C
CHxjsKR Print "" v=dKcruR: Print "Sample name: " & Chr(9) & sampName i528e{& Y8x(#qp, 'Open an output file and write the FRED header data Z5"!0B^ j Dim outFile As String 5d)'`hACe outFile = cDir & sampName & "_FRED.txt" 0+$hkd n Open outFile For Output As #1 ~e,f )? Print #1, "type bsdf_data" PR48~K,? Print #1, "format angles=deg bsdf=value scale=1" #fJ/KYJU /zChdjz 'Loop the file list, skip the two header lines and write the remaining data to file H>gWxJ
5 Dim lineArray() As String, curLine As Long <=B1"'\ For Each curFile In fList o06A=4I Print "Merging data from file " & curFile GapX$Jb,p ReadFile( cDir & curFile, lineArray ) >cvE_g"?C For curLine = 2 To UBound(lineArray) I{i:B Print #1, lineArray(curLine) gOBj0P8s|} Next M6@'9E]|> Next <k!mdj) 5n&)q=jk= 'Close the output file &>+I7Ts] Close #1 UKt/0Ze S,d ngb{ Print "Finished merging RPC data for sample " & sampName EF*oPn0| Print "FRED formatted data file: " & Chr(9) & outFile B^Rw?:hN End Sub ,qBnqi[ )]0[`iLe 'Utility function to read the contents of a file into an array of strings. < -@, Function ReadFile(ByVal fileName As String, _ LaEX kb*s ByRef lineArray() As String) As Long XL"v21X A?6{ ReadFile = -1 J
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# Dim oFSO As Object Z
L6~Eut Set oFSO = CreateObject("Scripting.FileSystemObject") pqGf@24c< Erase lineArray pw(U< ) :$X4#k< Dim fid As Long #XYLVee, If oFSO.fileexists( fileName ) Then 2V=FWuXC" fid = FreeFile() q;Ar&VrlNq Open fileName For Input As fid (e bBH lineArray = Split(Input(LOF(fid), fid), vbCrLf) g0;&/;" Close fid .:r2BgL End If 0NuL9 Set oFSO = Nothing ]HZa:aPY Return UBound( lineArray ) F$sF
'cw %~8](]p End Function >M8^Jgh h[[/p {z Sub GetFileList( ByVal in_dir As String, _ `o^;fcnG ByRef in_flist() As String ) +r#=n7t "p6:ekw 'Redimension the file list array mPw56> Erase in_flist FS]+s> TS~Y\Cp 'Tracks how many files are found c9cphZ(z Dim fCount As Long 5,=B1 fCount = 0 ^8f|clw" *Wuctu^9 'Recurse directory and search for text files nIN%<3U2 Dim f As String `|ck5DZT5L f = Dir$(in_dir & "*.txt") QB.*R? A While f <> "" e{rHO,#A> ReDim Preserve in_flist(fCount) J*6n6 in_flist(fCount) = f )W}/k$S fCount += 1 wr;|\<c f = Dir$() k1 LtqV Wend J}Z_.:JO(w ReDim Preserve in_flist(fCount-1) 6{Cu~G{]N >w]k3MC End Sub YCLD!S/?
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