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摘要: 71c[`h*0{ !V37ePFje 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。 - Fbp!*.
u )P:^A9&_n= 背景: UDg's 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。 chE!,gik 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。 s51$x M 图1. RPC Photonics工程漫射体结构及光束投射形状 k*hl"oL"X #lP8/-s^ LJ(WU)CPc 步骤 2(xC| 2Kz+COP+ 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 : OY~Q3
@ Vi8A4 图2. RPC Photonics工程漫射体不同类型的散射数据 YNU}R/u6^ 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) !rM~ 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 K}R+~<bIY 例如下所示: Lqj
Qv$ Sample name: EDF-C1-56 )O~[4xV~ Merging data from file EDF-C1-56 0-0.txt 5XZ!yYB? Finished merging RPC data for sample EDF-C1-56 y!77gx?- FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt xLz=)k['' 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 (hzN(Dh a. 创建一个新的散射库 pFd8p@m_2 b. 散射模型命名 5:h[%3'bB c. 改变散射模型为“Tabulated BSDF”. kW g.-$pp 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 ) `@h|+`h 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。 my.EvN 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, vjGQ! xF g. 点击OK RwWg:4 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 fe?Z33V Q6@<7E]y (CmK>"C+ 脚本代码: K T} JQ&t"`\k '#Language "WWB-COM" +T+@g8S |@Tga_0p Option Explicit $"^K~5Q _>;Wz7 Sub Main {3tzr ;c? Z'JS@dV 'Cleanup pN%&`]Wev ClearOutputWindow() nVb@sI{{k |W">&Rb<t# Print "Merging RPC Photonics BSDF Data Files" 7~/ cz_ SetTextColor(255,0,0) @w[i%F,&` Print "Note: Script should be located in the same folder as the BSDF TXT files." ]k0
jmE Print "Note: Do not run this script multiple times without deleting the output file between executions." cj/`m$ SetTextColor(0,0,0) \c=I!<9 /U~|B.z@6 'Current directory of this script (should be the same as the text files being merged) |cPHl+$nh. Dim cDir As String ~&?bU]F cDir = MacroDir$ & "\" %qP[+N& ^OR0Vp>L 'Array which will be populated with the list of files to be merged }htjT/Nm Dim fList() As String, curFile As String QHEtG2 GetFileList( cDir, fList ) :d36oiHKu Aw o)a8e Print "" \hB BG8=& Print "Files found for merging:" >qjV{M For Each curFile In fList rl*O-S/ Print Chr(9) & curFile 6OES'3 Cy Next 'y8{,R4C 'X`Z1L/ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. )D)5
`n) Dim nameArray() As String, sampName As String wbO6Ag@)) nameArray = Split(fList(0)," 0-0.txt") a V3:{oL sampName = nameArray(0) hRcb}>pr Print "" o`?rj!\ Print "Sample name: " & Chr(9) & sampName S&op|Z)1 l\HdB"nT 'Open an output file and write the FRED header data _"DS?`z6 Dim outFile As String I5$P9UE+^9 outFile = cDir & sampName & "_FRED.txt" Nk`UQ~g$ Open outFile For Output As #1 uy'ghF Print #1, "type bsdf_data" `2~>$Tr Print #1, "format angles=deg bsdf=value scale=1" KhCP9(A=Qo XH:*J+$O 'Loop the file list, skip the two header lines and write the remaining data to file E h%61/ Dim lineArray() As String, curLine As Long IP~!E_e}\ For Each curFile In fList "n-'?W! Print "Merging data from file " & curFile ] $ew 5% ReadFile( cDir & curFile, lineArray ) 092t6D} For curLine = 2 To UBound(lineArray) 0&.CAHb} Print #1, lineArray(curLine) #x%'U}sF Next |D3u"Y!:^ Next gt&|T
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K 'Close the output file X|M!Nt0' Close #1 o_b[ * i%glQT Print "Finished merging RPC data for sample " & sampName [&Xp]:M'D Print "FRED formatted data file: " & Chr(9) & outFile TBhM^\z End Sub e_vsiT g(DD8;]w< 'Utility function to read the contents of a file into an array of strings. cw;wv+|k Function ReadFile(ByVal fileName As String, _ \>L,X_DL ByRef lineArray() As String) As Long zd?@xno ZSMed(//b ReadFile = -1 D)_
C@*q Dim oFSO As Object +)Te)^&v% Set oFSO = CreateObject("Scripting.FileSystemObject") q!K:N? Erase lineArray .J#'k+> x^f<G
6z Dim fid As Long ajbe7#} If oFSO.fileexists( fileName ) Then HDyf]2N*N fid = FreeFile() od;-D~ Open fileName For Input As fid K,f:X g!: lineArray = Split(Input(LOF(fid), fid), vbCrLf) mgxIxusR Close fid w7nt $L5 End If Zw]`z*,yRA Set oFSO = Nothing QbU5FPiN Return UBound( lineArray ) dWY%bb V la,avON End Function E' 5*w6 vNv?trw Sub GetFileList( ByVal in_dir As String, _ Ku;fZN[g ByRef in_flist() As String ) yr]ja-Y ;#B(L=/ 'Redimension the file list array +,Dc0VC? Erase in_flist <sdgL+&1h _iwG'a[` 'Tracks how many files are found ;%|im? Dim fCount As Long wAMg"ImJ fCount = 0 B`tq*T% MsB>3 'Recurse directory and search for text files Jx*cq;`Vee Dim f As String Gk;YAI f = Dir$(in_dir & "*.txt") Y~ ~Dg?e While f <> "" +^I0>\ ReDim Preserve in_flist(fCount) 6K2e]r in_flist(fCount) = f p_r` " fCount += 1 4Z)4WGp! f = Dir$() 3WV(Ok Wend |%_C$s% ReDim Preserve in_flist(fCount-1) {N(qS'N :\TMm>%q
End Sub Xj?Wvt 3)OZf{D[ 3F9V,zWtTi QQ:2987619807 D?|D)"?qb
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