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摘要: \AG,dMS VrDv d 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。 I]h+24_S zR:S.e< 背景: ,}<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。 :98Pe6 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。 &Jj?C 图1. RPC Photonics工程漫射体结构及光束投射形状 cCwT0O#d !Bd2$y. [}Nfs3IlBw 步骤 zOcMc{w0 6Rso}hF}} 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 WWY9U i/->g:47P 图2. RPC Photonics工程漫射体不同类型的散射数据 G$q=WM!%#s 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) (mycUU% 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 5D'8 l@7 例如下所示: JprZ6
> Sample name: EDF-C1-56 3Vhm$y%Td Merging data from file EDF-C1-56 0-0.txt {It4=I)M Finished merging RPC data for sample EDF-C1-56 StE4n0V FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt }[1I_) 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 P5Fm<f8\ a. 创建一个新的散射库 :f`1 b. 散射模型命名 }/6jom9U? c. 改变散射模型为“Tabulated BSDF”. 6(wpf^br2 d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) yjr!8L:m e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 >_R5Li f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, U7Ps2~x3 g. 点击OK >:s:`Au 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 p%n}a%%I KzhldMJ^zq )y8$-"D(it 脚本代码: \!-X&ws ~;{)S}U@R '#Language "WWB-COM" ,cS|fG =oSv=xY Option Explicit RS$e^_ W @]~\H-8 Sub Main H -`7T;t~ `w&|~xT 'Cleanup k;"=y)@o ClearOutputWindow() ?g!py[CrE h!$W^Tm2g Print "Merging RPC Photonics BSDF Data Files" Zl]\sJ1" SetTextColor(255,0,0) o-R;EbL Print "Note: Script should be located in the same folder as the BSDF TXT files." MOdodyG Print "Note: Do not run this script multiple times without deleting the output file between executions." Ig]Gg/1G SetTextColor(0,0,0) 'Exj|Y& Q[S""P.Z| 'Current directory of this script (should be the same as the text files being merged) ?DA,]aa- Dim cDir As String :v=Yo cDir = MacroDir$ & "\" )
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|G{TA 'Array which will be populated with the list of files to be merged *l^h;RSx Dim fList() As String, curFile As String ?> }bg GetFileList( cDir, fList ) C;M.dd GKSfr8US4 Print "" EG2NE,,r Print "Files found for merging:" na_Y<R` For Each curFile In fList )9,9yd~SI Print Chr(9) & curFile 0d~>zKho Next <S%M*j hQvSh\p 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 6I"Q9( Dim nameArray() As String, sampName As String ,ie84o nameArray = Split(fList(0)," 0-0.txt")
W& w-yZ sampName = nameArray(0) hC=9%u{r? Print "" YeK PoW Print "Sample name: " & Chr(9) & sampName fHdPav f,S 3w#kvtDVm 'Open an output file and write the FRED header data b&. o9PV" Dim outFile As String Yu`b[]W outFile = cDir & sampName & "_FRED.txt" Rcfh*"k Open outFile For Output As #1 kTt;3 Ia Print #1, "type bsdf_data" dr'# Print #1, "format angles=deg bsdf=value scale=1" '/G.^Zl9 P'xq+Q 'Loop the file list, skip the two header lines and write the remaining data to file weYP^>gH' Dim lineArray() As String, curLine As Long G BV]7. For Each curFile In fList ggIz)</ Print "Merging data from file " & curFile 7g[T#B'/x, ReadFile( cDir & curFile, lineArray ) 8lh{ R For curLine = 2 To UBound(lineArray) |]w0ytL>(2 Print #1, lineArray(curLine) .A//Q|ot! Next I6ffp!^}Y Next *2Il{KOA^ 17
Hdj 'Close the output file JL=MlZ Close #1 c%n[v3] :$lx] Print "Finished merging RPC data for sample " & sampName 9X/c%:)\= Print "FRED formatted data file: " & Chr(9) & outFile < {$zOF} End Sub Xkk m~sM6 Ox#%Dm2 'Utility function to read the contents of a file into an array of strings. m_wBRan Function ReadFile(ByVal fileName As String, _ n(\5Z& ByRef lineArray() As String) As Long E=+v1\t)] ]#z^[XG ReadFile = -1 UJ3l8
%/`k Dim oFSO As Object ov.7FZ+ Set oFSO = CreateObject("Scripting.FileSystemObject") fH-V!QYGF Erase lineArray ep* ( <05\ Dim fid As Long \#Ez["mD
If oFSO.fileexists( fileName ) Then %{Ez0XwGCn fid = FreeFile() Q&S\?cKe Open fileName For Input As fid I'%vN^e^ lineArray = Split(Input(LOF(fid), fid), vbCrLf)
Gqvj Close fid 481J=8H End If t&MJSFkiA Set oFSO = Nothing |}P4Gr}6 Return UBound( lineArray ) G'T/I\tB cPZD#";f End Function v0&E!4q*' :f<3`x' Sub GetFileList( ByVal in_dir As String, _ l(
/yaZ` ByRef in_flist() As String ) {L^b['h@ fS+Ga1CsH 'Redimension the file list array ,g\%P5 Erase in_flist |7KW'=O \WKly 'Tracks how many files are found x2/L`q"M?= Dim fCount As Long OLp;eb1g fCount = 0 xO"fg9a @5jJoy(mX@ 'Recurse directory and search for text files ]Ng K(IU Dim f As String 7/%{7q3G> f = Dir$(in_dir & "*.txt") Ad !=
*n While f <> "" *Y(v!x \L ReDim Preserve in_flist(fCount) IMjz#|c in_flist(fCount) = f #/!fLU@ fCount += 1 hqOy*!8'@ f = Dir$() rjqQWfShY Wend ^|-*amh ReDim Preserve in_flist(fCount-1) -?{bCq =>Ss:SGjT End Sub t-7^deG'/n WxwSb`U| Rrh?0qWs QQ:2987619807 ;T6{J[
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