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摘要: S4(IYnwN xz%ig^L 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。 [Dt\E4 ;zOZu~Q|' 背景: \vT8
)\ 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。 3dM6zOK 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。 H}$#aXEAn 图1. RPC Photonics工程漫射体结构及光束投射形状 "E8!{ 3a5H<3w_ >:xnjEsi$/ 步骤 F0!r9U(( F?dTCa 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。 !kIw835U U-k;kmaj 图2. RPC Photonics工程漫射体不同类型的散射数据 B8nXWi 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) f>'7~69 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 -@73" w/ 例如下所示: Rsulp#[' Sample name: EDF-C1-56 tb
i;X=5 Merging data from file EDF-C1-56 0-0.txt
V|D;7 Finished merging RPC data for sample EDF-C1-56 yjpjJ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt f"tO*/|` 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 vIRE vj#U a. 创建一个新的散射库 4a 5n*6G! b. 散射模型命名 Kzm_AHA) c. 改变散射模型为“Tabulated BSDF”. f^]AyU;F: 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 ) \?g%>D:O; 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。 %MIu;u FR 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, I)x:NF6JO g. 点击OK ^U =`Rx 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 \xdt|:8 :X!(^a;] WLpn,8qsY 脚本代码: i~.[iZf| V?"^Ff3m! '#Language "WWB-COM" 6M6QMg^ Dux`BKl Option Explicit *Z]|
Z4Q/` 5A)w.i&V Sub Main JTI m`t"d= J.&q[ 'Cleanup D;L :a`Y ClearOutputWindow() B -KOf =j{jylC Print "Merging RPC Photonics BSDF Data Files" e\dT~)c SetTextColor(255,0,0) \(CW?9) Print "Note: Script should be located in the same folder as the BSDF TXT files." d5%*^nMpY Print "Note: Do not run this script multiple times without deleting the output file between executions." MT5A%|H e SetTextColor(0,0,0) gv,T<A?Z2 4Rm3'Ch 'Current directory of this script (should be the same as the text files being merged) C0W~Tk\C2 Dim cDir As String SQ!lgm1bA cDir = MacroDir$ & "\" A)#sh)
}Q w(U/(C7R 'Array which will be populated with the list of files to be merged +wSm6*j7= Dim fList() As String, curFile As String VB#31T#q? GetFileList( cDir, fList ) vP4Ij @}Ixr{t Print "" ^ZlV1G;/W@ Print "Files found for merging:" g#:XN For Each curFile In fList v;Dcq Print Chr(9) & curFile zJ:r0Bt Next 85fDuJ9$Z" #R8l"]fxr? 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ]Yu+M3Fq Dim nameArray() As String, sampName As String Tc(R-Wi nameArray = Split(fList(0)," 0-0.txt") vw]nqS~N sampName = nameArray(0) D5>~'N3b Print "" <f6PULm Print "Sample name: " & Chr(9) & sampName tb{{oxa,k _pGviGR 'Open an output file and write the FRED header data FNM"!z Dim outFile As String >l1Yhxd_0* outFile = cDir & sampName & "_FRED.txt" h n|E< Open outFile For Output As #1 T/;hIX:R Print #1, "type bsdf_data" \.a .'l Print #1, "format angles=deg bsdf=value scale=1" nc~d*K\! ) R@gnTe 'Loop the file list, skip the two header lines and write the remaining data to file Zsogx}i- Dim lineArray() As String, curLine As Long B|=maz:_ For Each curFile In fList 5r<(Z0 Print "Merging data from file " & curFile +I n"OR% ReadFile( cDir & curFile, lineArray ) 2S6EDXc For curLine = 2 To UBound(lineArray) :\JbWj_j Print #1, lineArray(curLine) RG3G},Q Next t"p#iia Next wKlCx yTt (fn:; 'Close the output file h3EDN:FQ Close #1 --YUiNhh S1`0d9ds# Print "Finished merging RPC data for sample " & sampName Iq]6] Print "FRED formatted data file: " & Chr(9) & outFile ~ p.W*skD End Sub "T%'Rp`j| -!>ZATL<B 'Utility function to read the contents of a file into an array of strings. 4_I{Q^f Function ReadFile(ByVal fileName As String, _ TY\"@(Q|G ByRef lineArray() As String) As Long DB%AO:8 Wky S Tc ReadFile = -1 TQd FC\@f" Dim oFSO As Object &]F|U3 Set oFSO = CreateObject("Scripting.FileSystemObject") 7B\(r~f`t Erase lineArray F` 5/9?;| fsc~$^.~\ Dim fid As Long -xu.=n@, If oFSO.fileexists( fileName ) Then @nX2*j*u fid = FreeFile() <lmJa# Open fileName For Input As fid niEEm`" lineArray = Split(Input(LOF(fid), fid), vbCrLf)
tW:/R@@ Close fid \e8*vos End If 6q[!X0u Set oFSO = Nothing #K1BJ#KUt Return UBound( lineArray ) Y0yO`W4 |id79qY7g End Function e_k
_ty` $:E}Nj]{& Sub GetFileList( ByVal in_dir As String, _ ObyuhAR ByRef in_flist() As String ) XVDd1#h I,<54?vS 'Redimension the file list array #!Cter2 Erase in_flist x~9z`d{! T[XP\!z]B! 'Tracks how many files are found 9g
&Ch9-/ Dim fCount As Long oUvk2]H fCount = 0 T
E&Q6 tkN3BQ 'Recurse directory and search for text files RD$tc~@UB Dim f As String EdAR<VfleA f = Dir$(in_dir & "*.txt") PWk?8dL- While f <> "" q _] ReDim Preserve in_flist(fCount) n*m"L|:ff in_flist(fCount) = f f;Bfh3 fCount += 1 n;kciTD%wK f = Dir$() W-!Bl&jF[ Wend ,M@m4bx ReDim Preserve in_flist(fCount-1) (}FW])y qbU1qF/ End Sub #x5 N{8 (' Ko#3b [CDX CV-z QQ:2987619807 ?z@v3(b[
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