RPC Photonics扩散片BSDF

5BAGIO<w   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

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   =&,<Co1hF   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 , #nYHD   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 $_Kcm"oj   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 n1    a. 创建一个新的散射库 );!IGcgF   b. 散射模型命名 I(Gl8F\c ~   c. 改变散射模型为“Tabulated BSDF”. Qk[YF   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） LM2S%._cj;   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 nmWo:ox4;(   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， pybE0]    g. 点击OK -PiakX   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 !lxq,Whr{   %/}46z9\   E5QQI9ea   脚本代码： ]y\Wc0q   y{g"w   '#Language "WWB-COM" ,p)Qu%'   (TTS-(   Option Explicit :x[SV^fw[   ]9lR:V sw   Sub Main 3k# h !Z   }Hy4^2B       'Cleanup =OamN7V=       ClearOutputWindow() FI8vABq   }'WEqNuE       Print "Merging RPC Photonics BSDF Data Files" >!3r7L gK       SetTextColor(255,0,0) Y{I,ipU.       Print "Note: Script should be located in the same folder as the BSDF TXT files." rr^?9M*{V       Print "Note: Do not run this script multiple times without deleting the output file between executions." CNl @8&R       SetTextColor(0,0,0) "L&84^lmf   MRN=-|fV^       'Current directory of this script (should be the same as the text files being merged) tRVz4 fk[G       Dim cDir As String `DS7J\c$       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!I 0Q2yd       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. $&X-ay o       Dim nameArray() As String, sampName As String ows3%       nameArray = Split(fList(0)," 0-0.txt") Mhu|S)hn       sampName  = nameArray(0) LV@tt&|N       Print "" {F ',e~}s       Print "Sample name: " & Chr(9) & sampName r!;wKO   ^l{q{O7U$       '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+<.1b       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>wzV=R       Dim lineArray() As String, curLine As Long oVQb c\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   ^$s&bH'8       Print "Finished merging RPC data for sample " & sampName &l0,q=T       Print "FRED formatted data file: " & Chr(9) & outFile H'}6Mw%ra   End Sub >%LY0(hY3    ^s\T<;   'Utility function to read the contents of a file into an array of strings. {uurLEe?   Function ReadFile(ByVal fileName As String, _ '"T9y=9]s                     ByRef lineArray() As String) As Long G7%f| Y   X#tCIyK,nV       ReadFile = -1 %D3Asw/5a       Dim oFSO As Object U (2=fKK;       Set oFSO = CreateObject("Scripting.FileSystemObject") bnZ H       Erase lineArray \. a7 F4h   40G'3HOp       Dim fid As Long S0`u!l89(       If oFSO.fileexists( fileName ) Then >qZl s'           fid = FreeFile() B Q2N_*v           Open fileName For Input As fid L_q3m-x0h           lineArray = Split(Input(LOF(fid), fid), vbCrLf) hQeG#KQ           Close fid z"-oD*ICw       End If +F*h\4ry#       Set oFSO = Nothing u.Tknw-X       Return UBound( lineArray ) zUq(bD   iN_P25Z<r   End Function beB3*o   _'l"Dk   Sub GetFileList( ByVal in_dir As String, _ w?Pex]i{                    ByRef in_flist() As String ) C;~LY&=   qRHT~ta-?       'Redimension the file list array S]NT+XM       Erase in_flist 1024L;   dDa&:L       'Tracks how many files are found t N4-<6       Dim fCount As Long -Jt36|O       fCount = 0 'Y/kF1,*   yMt: L)+       'Recurse directory and search for text files @`ii3&W4       Dim f As String _bt9{@)       f = Dir$(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)