RPC Photonics扩散片BSDF

vN Bg&m   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

&BRk<iwV   摘要： cLV*5?gVO   k7^hcth   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。 (QDKw}O2b   PMfW;%I.   背景： {y9G "   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。 suY47DCX)   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 IrMHAM5K   N&HI)X2&   QQrldc(I   7*l$i/!   步骤 ubwM*P   aV\i3\da   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 3`bQ0-D;   图2. RPC Photonics工程漫射体不同类型的散射数据 *?FVLE   pF{jIXu   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） ,<v0(   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 ^ %r6+ey   例如下所示： V&*IZt&   Sample name:  EDF-C1-56 BU:;;iV8   Merging data from file EDF-C1-56 0-0.txt 8!E.3'jb   Finished merging RPC data for sample EDF-C1-56 rfqwxr45h   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt qYK^S4L   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 5#GMp   a. 创建一个新的散射库 x3q^}sj%   b. 散射模型命名 RlOy,/-<   c. 改变散射模型为“Tabulated BSDF”. D0Dz@25-   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） hY`<J]-'`   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 TTXF r   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， S%iK);   g. 点击OK =\<NTu   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 6u, g   8,U~ p<Gz   #_DpiiS,.Q   脚本代码： Fi i(dmn   Uu_qy(4   '#Language "WWB-COM" p*Z<DEh#   287j,'vR   Option Explicit Z )7{~xq   K2xB%m1LK   Sub Main NNt n   ~P\4 N       'Cleanup |5^ iq W       ClearOutputWindow() 1aAOT6h   =t,oj6P~       Print "Merging RPC Photonics BSDF Data Files" W`[VLi}fe       SetTextColor(255,0,0) A%^?z.       Print "Note: Script should be located in the same folder as the BSDF TXT files." Y/sav;       Print "Note: Do not run this script multiple times without deleting the output file between executions." jr`swyg       SetTextColor(0,0,0) f Fi=/}   bJ:5pBJ3       'Current directory of this script (should be the same as the text files being merged) W>jKWi,{       Dim cDir As String fEBi'Ad       cDir = MacroDir$ & "\" Qsbyy>o)   [j6]!p]S$       'Array which will be populated with the list of files to be merged y4kn2Mw;       Dim fList() As String, curFile As String #(tdJ<HvC|       GetFileList( cDir, fList ) N3u06   T zKM~a#       Print "" E-WpsNJ)X       Print "Files found for merging:" QBa+xI_ J       For Each curFile In fList -C2!`/ U           Print Chr(9) & curFile jRsl/dmy       Next 6 wN*d 5   02,t       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ]!TE       Dim nameArray() As String, sampName As String .rBU"Rbo       nameArray = Split(fList(0)," 0-0.txt") [[[C`H@       sampName  = nameArray(0) ;Rv WF )       Print "" q7CLxv &QG       Print "Sample name: " & Chr(9) & sampName Z66Xj-o   |eRE'Wd0       'Open an output file and write the FRED header data T={!/y+       Dim outFile As String vd%AV(]<LJ       outFile = cDir & sampName & "_FRED.txt" ozY$}|sjDT       Open outFile For Output As #1 "M:ui0YP       Print #1, "type bsdf_data" Z`kVyuQ       Print #1, "format angles=deg bsdf=value scale=1" +(!/(2>~   9,8/DW.K       'Loop the file list, skip the two header lines and write the remaining data to file kI" 9T`owR       Dim lineArray() As String, curLine As Long p-j6H       For Each curFile In fList Jj)J5S /           Print "Merging data from file " & curFile E]Mx<7;\.           ReadFile( cDir & curFile, lineArray ) ^P,Pj z           For curLine = 2 To UBound(lineArray) fgqCX:SWz               Print #1, lineArray(curLine) T`^Jws{;7           Next ` \@n&y[`7       Next @v`.^L{P   * K$U[$s       'Close the output file |cd"cx+       Close #1 @KM?agtlbl   azFJ-0n@"       Print "Finished merging RPC data for sample " & sampName uG -+&MU?       Print "FRED formatted data file: " & Chr(9) & outFile `a52{Wa   End Sub N4x5!00   jwjLxt   'Utility function to read the contents of a file into an array of strings. a=W%x{   Function ReadFile(ByVal fileName As String, _ r],%:imGr                     ByRef lineArray() As String) As Long m$C1Ea-wnT   dA~_[x:Z       ReadFile = -1 </'n={+q       Dim oFSO As Object K Zg NL|       Set oFSO = CreateObject("Scripting.FileSystemObject") b~UWFX#U       Erase lineArray :^W}$7$T   :2KPvp7?       Dim fid As Long z4 =OR@ h       If oFSO.fileexists( fileName ) Then zf8SpQ2~           fid = FreeFile() [4xZy5V           Open fileName For Input As fid E-^(VZ_Xj           lineArray = Split(Input(LOF(fid), fid), vbCrLf) +\["HS7+'0           Close fid @_t=0Rc       End If '__>M>[       Set oFSO = Nothing 6&]Z'nW0k       Return UBound( lineArray ) y_>DszRN`u   k>i`G5Dh   End Function \s[L=^!   +@uA   Sub GetFileList( ByVal in_dir As String, _ 4RctYMz                    ByRef in_flist() As String ) d b_Qt'>   &3IkC(yD       'Redimension the file list array 0Sk~m4fj(       Erase in_flist iOfO+3'Z_U   ! \|       'Tracks how many files are found Xl1%c7r.1       Dim fCount As Long `oe=K{aX       fCount = 0 PZru:.Mh   =p5]r:9W       'Recurse directory and search for text files ,){# J"W       Dim f As String Z^Um\f       f = Dir$(in_dir & "*.txt") P(yLRc       While f <> "" X2I_,k'fQ           ReDim Preserve in_flist(fCount) v.*fJ           in_flist(fCount) = f 6p@[U>`           fCount += 1 (`slC~"           f = Dir$() vCej( ))       Wend J|hVD       ReDim Preserve in_flist(fCount-1)