RPC Photonics扩散片BSDF

(]pQ.3   RPC Photonics扩散片BSDF

时间:2016-01-08 23:10来源:讯技光电作者: 技术部点击:次打印

Cr&ua|%F   摘要： xS.0u"[   JvG t=v   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" l~=1Dr   kTzZj|l^\   背景： .`iq+i~   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。 w"D"9G   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 FrVD ~;   l/`Z+];   Ft]sTA+ C   {S}/LSNB   步骤 ]6nF>C-C   $UH_)Q2#J^   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。 55AG>j&41   图2. RPC Photonics工程漫射体不同类型的散射数据 $Fn# b|e   \&cVcAg   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） ^!}lA9\gY   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 x&f?c=\F   例如下所示： z`BRz&   Sample name:  EDF-C1-56 Ah"RxA   Merging data from file EDF-C1-56 0-0.txt , ^' Y7"   Finished merging RPC data for sample EDF-C1-56 I5e!vCG)   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt d BJM?/   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 OZ-F+#d   a. 创建一个新的散射库 Ji7A9Hk   b. 散射模型命名 /E*P0y~KTW   c. 改变散射模型为“Tabulated BSDF”. o~~_>V)W   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） ~r{Nc j   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 xNx! 2MrR;   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， Um|:AT}`^   g. 点击OK bkY7]'.bz&   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 CfVz'    l[ L{m7   jHFdDw|N`   脚本代码： ^RY_j>i   h\yYg'CC   '#Language "WWB-COM" VA]%i P,O-   0wc+<CUW   Option Explicit O[N{&\$   vg)zk2O   Sub Main vzVl2   wwF20       'Cleanup c,+oH<bZZs       ClearOutputWindow() D6 M:pIN*   6I> W(_T       Print "Merging RPC Photonics BSDF Data Files" tV<Au       SetTextColor(255,0,0) SmRU!C$A       Print "Note: Script should be located in the same folder as the BSDF TXT files." $1w8GI\J       Print "Note: Do not run this script multiple times without deleting the output file between executions." KLoHjBq       SetTextColor(0,0,0) r[hfN2, #   J${wU@_%       'Current directory of this script (should be the same as the text files being merged) [H"Ods ~_`       Dim cDir As String q'W`t>2T       cDir = MacroDir$ & "\" l lQ<x   [@/G?sAQm\       'Array which will be populated with the list of files to be merged \tQRyj\|       Dim fList() As String, curFile As String h5Z%|J>; 0       GetFileList( cDir, fList ) )2R:P`U   \ii^F?+b       Print "" uD+;5S]us       Print "Files found for merging:" LNr2YRpyz       For Each curFile In fList Lrz>00(*4           Print Chr(9) & curFile u|Db%) [       Next @ws3X\`<C   YWm:#{n.       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. KC       Dim nameArray() As String, sampName As String ^*Ca+22xO       nameArray = Split(fList(0)," 0-0.txt") ;8UNM       sampName  = nameArray(0) Ar>-xCTD       Print "" p[W8XX       Print "Sample name: " & Chr(9) & sampName 9g>ay-W[(   'a4xi0**I       'Open an output file and write the FRED header data br0gB3r       Dim outFile As String 73P(oVj <       outFile = cDir & sampName & "_FRED.txt" 398%16}       Open outFile For Output As #1 }J:~}?^%n       Print #1, "type bsdf_data" $rf5\_G,96       Print #1, "format angles=deg bsdf=value scale=1" m!v`nw]   q7X/"Dfx       'Loop the file list, skip the two header lines and write the remaining data to file {y :/9       Dim lineArray() As String, curLine As Long ~uV.jh       For Each curFile In fList B:Msn)C~           Print "Merging data from file " & curFile 3:S Ex;d+           ReadFile( cDir & curFile, lineArray ) g{dyDN$5|w           For curLine = 2 To UBound(lineArray) lQ@2s[               Print #1, lineArray(curLine) uI+h9j$vS           Next B<+}_3.       Next [<bfwTFsl   +        'Close the output file Z!tt(y\       Close #1 V5M_N;h   '%)7%O,2       Print "Finished merging RPC data for sample " & sampName 0gxbo       Print "FRED formatted data file: " & Chr(9) & outFile taI])   End Sub e PlEd'Z   0hCJovSG%   'Utility function to read the contents of a file into an array of strings. wS8qua   Function ReadFile(ByVal fileName As String, _ /J1O{L                     ByRef lineArray() As String) As Long Nqy',N   3_ObCsJ#,       ReadFile = -1 eBG7]u, Q       Dim oFSO As Object O /aC%%       Set oFSO = CreateObject("Scripting.FileSystemObject") k4s >sd3 5       Erase lineArray [O9(sWL'   q1Ah!9B       Dim fid As Long IL`5RZi1       If oFSO.fileexists( fileName ) Then %Wn/)#T|           fid = FreeFile() CShVJ:u+K\           Open fileName For Input As fid 8%2*RKj           lineArray = Split(Input(LOF(fid), fid), vbCrLf) OY/QA           Close fid .-fJ\`^mi       End If 7w YSP&$       Set oFSO = Nothing )}vQ?n[:'       Return UBound( lineArray ) m?bb/o' B   j[9xF<I   End Function 5"k_Ms7R,   OP%h`   Sub GetFileList( ByVal in_dir As String, _ ME{i-E4                    ByRef in_flist() As String ) pT:CvJ   lB.P        'Redimension the file list array ,)u}8ty3j       Erase in_flist PUF"^9v   .}%$l.#a       'Tracks how many files are found -Z)$].~|t       Dim fCount As Long d8/lEmv[       fCount = 0 Ond"Eq=r   H>a3\M       'Recurse directory and search for text files +u:8#!X$RD       Dim f As String >J|I       f = Dir$(in_dir & "*.txt") '9]%#^[Q       While f <> "" XBdC/DM[           ReDim Preserve in_flist(fCount) i%D/@$\D6           in_flist(fCount) = f ,m9Nd "6\           fCount += 1 q$0^U{j/           f = Dir$() VNx}ADXu]       Wend wnN@aO6g*       ReDim Preserve in_flist(fCount-1)