RPC Photonics扩散片BSDF

[ [sfuJD   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

\vQjTM-7   摘要： }E%#g#   bQFMg41*w7   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。 GIGC,zP@k   ~xSAR;8   背景： 2IGoAt>V   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。 Bw;LGEHi|   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 q!+&|F   ?6=u[))M&   2Yt+[T*   V<%eWT)x7C   步骤 bm:"&U*tu'   jR[3{ Reo   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。 8vL2<VT;   图2. RPC Photonics工程漫射体不同类型的散射数据 h &R1"   [hl8LP+~   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） f8c'`$O   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 1!4-M$-   例如下所示：  l,n V*Z   Sample name:  EDF-C1-56 2l#c?]TA   Merging data from file EDF-C1-56 0-0.txt Cj 6+zJ   Finished merging RPC data for sample EDF-C1-56 3w-0IP]<   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt <*4BT}r,^2   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 r%^l~PN   a. 创建一个新的散射库 ,4&?`Q   b. 散射模型命名 v ==b. 2=   c. 改变散射模型为“Tabulated BSDF”. d@?++z   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 ） V{y P/X   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。 Wu!s   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， 'zg; *)x1/   g. 点击OK bI_T\Eft   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 zc n/LF   E1&9( L5   8o SNnT   脚本代码： &eqeQD6   f=L&>X   '#Language "WWB-COM" ?"o7x[   X' ,0vK   Option Explicit &Oih#I   sG6ts,={   Sub Main LW$(;-rY   1YrIcovi-       'Cleanup }CCTz0[D"       ClearOutputWindow() R;]z/|8   $gv3Up"U       Print "Merging RPC Photonics BSDF Data Files" 9 Y-y?Y       SetTextColor(255,0,0) \pVmSac,       Print "Note: Script should be located in the same folder as the BSDF TXT files." .a0]1IkatV       Print "Note: Do not run this script multiple times without deleting the output file between executions." Fzc8)*w       SetTextColor(0,0,0) P~H ?[ ;   b-+~D9U<       'Current directory of this script (should be the same as the text files being merged) Sl!#!FGI       Dim cDir As String hN5?u:       cDir = MacroDir$ & "\" wIbxnn   Z?);^m|T       'Array which will be populated with the list of files to be merged '=Z]mi/aw       Dim fList() As String, curFile As String k"z ~>       GetFileList( cDir, fList ) |g@n'^]   u3B[1Ae:K       Print "" 6` 8H k;       Print "Files found for merging:" s IE2a0+       For Each curFile In fList >OLKaghV.5           Print Chr(9) & curFile P"%QFt,       Next ye-EJDZN   #aeKK7[       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 5vmc'Om       Dim nameArray() As String, sampName As String e}u68|\EC       nameArray = Split(fList(0)," 0-0.txt") S#^2k!(|G       sampName  = nameArray(0) hn-!W;j       Print "" <0w"$.K#3       Print "Sample name: " & Chr(9) & sampName c&mLK1A6   1 z6$>{FUR       'Open an output file and write the FRED header data I0qSx{K       Dim outFile As String QH d^?H*       outFile = cDir & sampName & "_FRED.txt" ]VCVV!G_=n       Open outFile For Output As #1 <?>1eU%       Print #1, "type bsdf_data" $5]}]       Print #1, "format angles=deg bsdf=value scale=1" [B,w\PLub   [XKudw%       'Loop the file list, skip the two header lines and write the remaining data to file Xv&&U@7       Dim lineArray() As String, curLine As Long <l.l6okp       For Each curFile In fList T)Zef           Print "Merging data from file " & curFile yd|roG/           ReadFile( cDir & curFile, lineArray ) =<;C5kSD           For curLine = 2 To UBound(lineArray) pK|~G."6e               Print #1, lineArray(curLine) IrMUw$           Next s;ivoGe}       Next JqmxS*_P   \x7^ly$_       'Close the output file ++=f7yu       Close #1 RDSkFK( D   "M!]t,?S       Print "Finished merging RPC data for sample " & sampName mp:xR^5c       Print "FRED formatted data file: " & Chr(9) & outFile QhJuH_f 0   End Sub 3-PqUJT$   0z =?}xr   'Utility function to read the contents of a file into an array of strings. T 2ZB(B D   Function ReadFile(ByVal fileName As String, _ euyd(y$'k                     ByRef lineArray() As String) As Long ;H4s[#K   $ o }       ReadFile = -1 chE}TK       Dim oFSO As Object H,3WdSL`K       Set oFSO = CreateObject("Scripting.FileSystemObject") ,6 IKkyD       Erase lineArray \:m1{+l   {6tj$&\)       Dim fid As Long ogvB{R       If oFSO.fileexists( fileName ) Then F+SqJSa           fid = FreeFile() A`:a T{j           Open fileName For Input As fid I !J'           lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0g`$Dap           Close fid S aH':UN       End If OfK>-8       Set oFSO = Nothing 4o<rj4G>       Return UBound( lineArray ) *6bO2LO"   Q@ Ze+IhK`   End Function F;L8FL-   *N&~Uq^   Sub GetFileList( ByVal in_dir As String, _ VTwDa*]AhB                    ByRef in_flist() As String ) `tPVNO,l   6Vj=SYK       'Redimension the file list array &\y`9QpVF       Erase in_flist RuGG3"|   CUN1.i<pk8       'Tracks how many files are found +^DDWVp       Dim fCount As Long f.Y [2b       fCount = 0 4:9N]1JCb   :2.<JUDM       'Recurse directory and search for text files E1`TQA       Dim f As String b+CJRB1       f = Dir$(in_dir & "*.txt") #,9s\T       While f <> "" t$e'[;w           ReDim Preserve in_flist(fCount) Y$5uoq%p3A           in_flist(fCount) = f _CMNmmp`e           fCount += 1 bE;c&g           f = Dir$() q5G`q&O5       Wend DF>3)oTF       ReDim Preserve in_flist(fCount-1)