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摘要: dKG 2f bL6, fUS 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。 j9voeV|7 vv F: 背景: B&bQvdp 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。 h'wI 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。 v`G [6Z 图1. RPC Photonics工程漫射体结构及光束投射形状
i_[nW dTATJ)NH y)Y0SY1\j 步骤 l-~
o&n a7Xa3 vlpO 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。 Ub"6OT1tl x/)o'#d$|l 图2. RPC Photonics工程漫射体不同类型的散射数据 <k c9KE 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) {&I3qk2( 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 dPVl\<L1 例如下所示: JSCZX:5 Sample name: EDF-C1-56 V\2&?#GZ Merging data from file EDF-C1-56 0-0.txt 3|Vh[iAa\ Finished merging RPC data for sample EDF-C1-56 v
7g? FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt -9X#+- 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 YXFUZ9a#e a. 创建一个新的散射库 5nQxVwY b. 散射模型命名 #P^cR_|\ c. 改变散射模型为“Tabulated BSDF”. FN>ns, d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) HOY@<' e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 W "}Cfv f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, LQr+)wI g. 点击OK (Y[q2b 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 DV6B_A{kI xnp5XhU /Y7YyjMi 脚本代码: ]Av)N6$&-Z #[<XNs!" '#Language "WWB-COM" xDtJ&6uFw V\=QAN^ Option Explicit V=+wsc -Y:^<C^^&8 Sub Main xBevf&tP H\[:uUK5\ 'Cleanup uY"Bgz:=d ClearOutputWindow() ^5- 8'9 w wgV?1S>Z Print "Merging RPC Photonics BSDF Data Files" h p<NVST SetTextColor(255,0,0) rO;Vr},3\% Print "Note: Script should be located in the same folder as the BSDF TXT files." u@ psVt Print "Note: Do not run this script multiple times without deleting the output file between executions." +kdZfv> SetTextColor(0,0,0) Q9C;_Up fMSB 'Current directory of this script (should be the same as the text files being merged) S @WzvM Dim cDir As String YS|Ve*t(L= cDir = MacroDir$ & "\" q<2b,w== z~ R: !O- 'Array which will be populated with the list of files to be merged x]X!nx6G Dim fList() As String, curFile As String
0)Wrfa GetFileList( cDir, fList ) }o{6 qE W3k), Print "" )8244; Print "Files found for merging:" 7z@Jw For Each curFile In fList x[w!buV0\ Print Chr(9) & curFile hZ;[}5T\<S Next p0b2n a
! XSDudL 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. DFUW^0N Dim nameArray() As String, sampName As String 99]&Xj nameArray = Split(fList(0)," 0-0.txt") Q&d"uLsx sampName = nameArray(0) '
6#en9{L Print "" x,~ ys4 Print "Sample name: " & Chr(9) & sampName D3MRRv# MPxe|Wws 'Open an output file and write the FRED header data N %K%0o- Dim outFile As String tc2e)WZP outFile = cDir & sampName & "_FRED.txt" dEuts*@Q Open outFile For Output As #1 Z8yt8O Print #1, "type bsdf_data" gWZzOH* Print #1, "format angles=deg bsdf=value scale=1" WdvXVF 8F#z)>q~ 'Loop the file list, skip the two header lines and write the remaining data to file 3%'Y): Dim lineArray() As String, curLine As Long I_\#( For Each curFile In fList ]=EYju@ Print "Merging data from file " & curFile =SEgv;#KZ~ ReadFile( cDir & curFile, lineArray ) tXWhq For curLine = 2 To UBound(lineArray) 2xEG s Q Print #1, lineArray(curLine) '9R.$,N Next k9|8@3(h Next =,4iMENm! =Co[pt 'Close the output file ?-HLP%C(' Close #1 m+7/ebj{A (aQNe{D# Print "Finished merging RPC data for sample " & sampName Qv`Lc]' Print "FRED formatted data file: " & Chr(9) & outFile &P,z$H{o@ End Sub Dno'-{- ET[vJnReC 'Utility function to read the contents of a file into an array of strings. ^jiYcg@_[ Function ReadFile(ByVal fileName As String, _ ]?$eBbt ByRef lineArray() As String) As Long dhAkD-Lh 8M DX()Bm ReadFile = -1 HLYTt)f} Dim oFSO As Object !eH9LRp Set oFSO = CreateObject("Scripting.FileSystemObject") 0:SR29(p1 Erase lineArray x%WL!Lo
z|5Sy.H> Dim fid As Long GOII
B If oFSO.fileexists( fileName ) Then A3Lfh6O fid = FreeFile() i7UE9Nyl* Open fileName For Input As fid `7))[._ lineArray = Split(Input(LOF(fid), fid), vbCrLf) E7K(I ? Close fid *t-Wol End If (r ]3tGp Set oFSO = Nothing :nPLQqXGQ Return UBound( lineArray ) 6*({ZE Y4 < End Function I5$@1+B :{YOJDtR Sub GetFileList( ByVal in_dir As String, _ ox2?d<dC6 ByRef in_flist() As String ) >Wbt_%dKy #go!"HL 'Redimension the file list array E<|p9,M Erase in_flist >kLUQ%zE@ 5^}"Tn4I 'Tracks how many files are found l?AWG& Dim fCount As Long F*bmV>Qq fCount = 0 I\|x0D jQgy=;?Lwm 'Recurse directory and search for text files ^-24S#KE Dim f As String 8!T6N2O6d f = Dir$(in_dir & "*.txt") =WYI|3~Cz While f <> "" FuKp`T-H ReDim Preserve in_flist(fCount) uzA_Zjx in_flist(fCount) = f # RG/B2 fCount += 1 '^!1A GF f = Dir$() E[Rd=/P6 Wend O$2'$44HX ReDim Preserve in_flist(fCount-1) 9MmAoLm X;hV+|Bo End Sub F_?aoP&5
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