RPC Photonics扩散片BSDF

yyb8ll?@a   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

DyIuM{Owj   摘要： i7v> 9p7   7KXc9:p+   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。 wK0vKdi   GY%lPp   背景： .I_Mmaq;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。 p3>p1tC   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 Ugzq;}V#   `Nmw   Y4q;   Li)rs<IX;m   步骤 ")LcB'C   bim}{wMb   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。 U [1Rw6   图2. RPC Photonics工程漫射体不同类型的散射数据 D#R5G    S) ZcH   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） -,+zA.{+W   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 CmKbpN*   例如下所示： s>hNw b/   Sample name:  EDF-C1-56 y5gTd_-   Merging data from file EDF-C1-56 0-0.txt mDZ/Kp{   Finished merging RPC data for sample EDF-C1-56 5'>DvCp%M   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt .&fG_(6|   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 I~ Q2jg2   a. 创建一个新的散射库 ~~,] b   b. 散射模型命名 o6L\39v_   c. 改变散射模型为“Tabulated BSDF”. xe9E</M_   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 ） 4+Aht]$hC   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。 }Fs;sfH   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， ! f!/~M"!   g. 点击OK 6Q\0v   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 x UM,"+h   J?9K|4 )   3[`/rg,   脚本代码： =GH>-*qp   |hHj7X<?k   '#Language "WWB-COM" CWF(OMA   .yK~FzLs   Option Explicit 2Iv&XxSo   zY_?$9l0   Sub Main ,i0Dw"/u   C]/]ot0%t       'Cleanup 0m8mHJ<&       ClearOutputWindow() y~eQVnH5W   }XHB7,       Print "Merging RPC Photonics BSDF Data Files" FO[x c;       SetTextColor(255,0,0) [{R^!Az&b<       Print "Note: Script should be located in the same folder as the BSDF TXT files." r:rM~``       Print "Note: Do not run this script multiple times without deleting the output file between executions." |AD"}8       SetTextColor(0,0,0) V\Q=EsHj    +r8:t5:/I       'Current directory of this script (should be the same as the text files being merged) Y 1v9sMN,       Dim cDir As String l=+hs       cDir = MacroDir$ & "\" N>a. dYXr   {nQ?+o3       'Array which will be populated with the list of files to be merged <V?csx/eRd       Dim fList() As String, curFile As String jTSN`R9@       GetFileList( cDir, fList ) P_7QZ0 k/   $qndG,([F       Print "" M{(g"ha       Print "Files found for merging:" vMD%.tk       For Each curFile In fList 4\?z^^           Print Chr(9) & curFile hD)'bd       Next {Sl#z}@s   7\;4 d4u       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. VK)vb.:       Dim nameArray() As String, sampName As String Hsdcv~Xr;l       nameArray = Split(fList(0)," 0-0.txt") D5Z@6RVt       sampName  = nameArray(0) oh^/)2W       Print "" v,} Mn7:       Print "Sample name: " & Chr(9) & sampName 8D]&wBR:   d2~*fHx_!       'Open an output file and write the FRED header data `eo $o!       Dim outFile As String W{@,DQ       outFile = cDir & sampName & "_FRED.txt" Yee% <<S       Open outFile For Output As #1 +Oxw?`I$       Print #1, "type bsdf_data" -e2f8PV?3       Print #1, "format angles=deg bsdf=value scale=1" ]S2F9   b7uxCH]Z       'Loop the file list, skip the two header lines and write the remaining data to file A r=P;6J       Dim lineArray() As String, curLine As Long )I{~Pcq       For Each curFile In fList s@$SM,tnn           Print "Merging data from file " & curFile %tK^&rw%           ReadFile( cDir & curFile, lineArray ) gRsV-qS           For curLine = 2 To UBound(lineArray) +hZ{/               Print #1, lineArray(curLine) d~QZcR           Next l b9O       Next #q nK nxD   7=wPd4       'Close the output file q2{Aq[       Close #1 r9 5hW   [Dq@(Q s'       Print "Finished merging RPC data for sample " & sampName oR@emYL       Print "FRED formatted data file: " & Chr(9) & outFile n1Z *wMwC   End Sub Efa3{ 7>{   C#l9M xZE   'Utility function to read the contents of a file into an array of strings. NScUlR"nE   Function ReadFile(ByVal fileName As String, _ Z@ dS,M*                     ByRef lineArray() As String) As Long 1m{c8Z.h/d   :OKU@l|       ReadFile = -1 -s_=4U,       Dim oFSO As Object N5F+h94z]       Set oFSO = CreateObject("Scripting.FileSystemObject") e~1$x`DH       Erase lineArray Ib}~Q@?2   Z~{0x# ?4%       Dim fid As Long ugy:^U       If oFSO.fileexists( fileName ) Then ).i :C(|           fid = FreeFile() 9O{b8=\}           Open fileName For Input As fid k:yrh:JhB           lineArray = Split(Input(LOF(fid), fid), vbCrLf)  m1#,B<6           Close fid ba"_!D1       End If Fo;.       Set oFSO = Nothing +\GuZ5`       Return UBound( lineArray ) ] <y3;T\~   *7`amF-   End Function +01bjM6F_1   2tMa4L%@C   Sub GetFileList( ByVal in_dir As String, _ }nt,DG!r                    ByRef in_flist() As String ) k%K\~U8"   6xW17P       'Redimension the file list array 3;er.SF u{       Erase in_flist VD0U]~CWR   eFz!`a^dX       'Tracks how many files are found j\%m6\{n|       Dim fCount As Long dz"HO!9       fCount = 0 s g 6e% 5   dMDSyd<(       'Recurse directory and search for text files FV>xAU$       Dim f As String E>L_$J-A-       f = Dir$(in_dir & "*.txt") <;q)V%IUz       While f <> "" FX&)~)           ReDim Preserve in_flist(fCount) E[8i$           in_flist(fCount) = f $E35W=~)           fCount += 1 &?0hj@kd~           f = Dir$() LT:*K!>NOL       Wend NVG`XL       ReDim Preserve in_flist(fCount-1)