7ZR0cJw; 摘要: +v{g' >2BWie?T 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。 }c?W|#y`.o =&,<Co1 hF 背景: 7mBH#Q) 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。 qdQQt5Y'm 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。图1. RPC Photonics工程漫射体结构及光束投射形状 |]UR&* U'oFW@Y;h !V~,aoKTj ODFCA.
t 步骤 `iZ){JfAH ?qt .+2: 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。 6cVJu%<V 图2. RPC Photonics工程漫射体不同类型的散射数据 , #nYH D jnzOTS 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) 3bBCA9^se 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 0Bn35.K 例如下所示: {Q~HMe`, Sample name: EDF-C1-56 \3XG8J Merging data from file EDF-C1-56 0-0.txt |)[I$]L Finished merging RPC data for sample EDF-C1-56 VOkSR6 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt $_Kcm"oj 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 n1 a. 创建一个新的散射库 );!IGcgF b. 散射模型命名 I(Gl8F\c~ c. 改变散射模型为“Tabulated BSDF”. Qk[YF d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) LM2S%._cj; e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 nmWo:ox4;( f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, pybE0] g. 点击OK -PiakX 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ! lxq,Whr{ %/}46z9\ E5QQI9ea 脚本代码: ]y\Wc0q y{g"w '#Language "WWB-COM" ,p)Qu%' (TTS-( Option Explicit :x[SV^fw[ ]9lR:V
sw Sub Main 3k# h!Z }Hy4^2B 'Cleanup =OamN7V= ClearOutputWindow() FI8vABq
}'WEqNuE Print "Merging RPC Photonics BSDF Data Files" >!3r7LgK SetTextColor(255,0,0) Y{I,ipU. Print "Note: Script should be located in the same folder as the BSDF TXT files." rr^?9M*{V Print "Note: Do not run this script multiple times without deleting the output file between executions." CNl @8&R SetTextColor(0,0,0) "L&84^lmf MRN=-|fV^ 'Current directory of this script (should be the same as the text files being merged) tRVz4fk[G Dim cDir As String `DS7J\c$ cDir = MacroDir$ & "\" ESmWK;7b P^^WViVX 'Array which will be populated with the list of files to be merged ((AIrE>Rr Dim fList() As String, curFile As String 4vJg"*? GetFileList( cDir, fList ) 7-VP)|L#G N1yx|g: Print "" b_w(F_0 Print "Files found for merging:" f-`C1|\w For Each curFile In fList a)QSq<2* Print Chr(9) & curFile E RjMe'q4 Next '1"vwXJ" ^i!I0Q2yd 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. $&X-ay o Dim nameArray() As String, sampName As String ows3% nameArray = Split(fList(0)," 0-0.txt") Mhu|S)hn sampName = nameArray(0) LV@tt&|N
Print "" {F ',e~}s Print "Sample name: " & Chr(9) & sampName r!;wKO ^l{q{O7U$ 'Open an output file and write the FRED header data x5R|,bY Dim outFile As String _6.Y3+7I outFile = cDir & sampName & "_FRED.txt" V`m9+<.1 b Open outFile For Output As #1 zuS4N?t`p Print #1, "type bsdf_data" \49s;\I] Print #1, "format angles=deg bsdf=value scale=1" ~oz??SX +vIsYg*#2M 'Loop the file list, skip the two header lines and write the remaining data to file w >w zV=R Dim lineArray() As String, curLine As Long oVQbc\P3 For Each curFile In fList u;9a/RI Print "Merging data from file " & curFile (*Z:ByA ReadFile( cDir & curFile, lineArray ) 'x<o{Hi"\B For curLine = 2 To UBound(lineArray) [LM9^*sG2V Print #1, lineArray(curLine) PZihC
Next zs.@=Z" Next ;:
0<(!^* ?N=`}}Ky- 'Close the output file 2H/{OQ$ Close #1 <72q^w ^$s&bH'8 Print "Finished merging RPC data for sample " & sampName &l0,q=T Print "FRED formatted data file: " & Chr(9) & outFile H'}6Mw%ra End Sub >%LY0(hY3 ^s\T<; 'Utility function to read the contents of a file into an array of strings. {uurLEe? Function ReadFile(ByVal fileName As String, _ '"T9y=9]s ByRef lineArray() As String) As Long G7%f|
Y X#tCIyK,nV ReadFile = -1 %D3Asw/5a Dim oFSO As Object U(2=fKK; Set oFSO = CreateObject("Scripting.FileSystemObject") bnZ H Erase lineArray \. a 7F4h 40G'3HOp Dim fid As Long S0`u!l89( If oFSO.fileexists( fileName ) Then >qZl
s' fid = FreeFile() B Q2N_*v Open fileName For Input As fid L_q3m-x0h lineArray = Split(Input(LOF(fid), fid), vbCrLf) hQeG#KQ Close fid z"-oD*ICw End If +F*h\4ry# Set oFSO = Nothing u.Tknw-X Return UBound( lineArray ) zUq(bD iN_P25Z<r End Function beB3*o _'l"Dk Sub GetFileList( ByVal in_dir As String, _ w?Pex]i{ ByRef in_flist() As String ) C;~LY&= qRHT~ta-? 'Redimension the file list array S]NT +XM Erase in_flist 1024L; dDa&:L 'Tracks how many files are found t N4-<6 Dim fCount As Long -Jt36|O fCount = 0 'Y/kF1,* yMt:L)+ 'Recurse directory and search for text files @`ii3&W4 Dim f As String _bt9{@) f = Dir$(in_dir & "*.txt") frc9 While f <> "" }<zbx*! ReDim Preserve in_flist(fCount) [^D>xD3B2 in_flist(fCount) = f Bg}l$?S fCount += 1 8tVSai8[ f = Dir$() DTa!vg Wend Qq'e#nI@ ReDim Preserve in_flist(fCount-1) |