RPC Photonics扩散片BSDF

A3z/Bz4]:#   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

di--:h/   摘要： 3;y_qwA   0~qf-x   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。 wZ$tJQO   abL/Y23 "   背景： RZW$!tyI=   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。 |PI)A`   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 uC- A43utv   FOeVRq:#   sr;:Dvx~   ;*W=c   步骤 I88Zrhw   m"<4\;GK   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。 Hw \([j*   图2. RPC Photonics工程漫射体不同类型的散射数据 <{E;s)hD?   -MDOZz\   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） ^p$1D   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 '!Hhd![\=|   例如下所示： 7AI3|Ts]p   Sample name:  EDF-C1-56 Ir!2^:]!   Merging data from file EDF-C1-56 0-0.txt P`p6J8}4   Finished merging RPC data for sample EDF-C1-56 %)8d{1at   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt m dC`W&r   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 `'*F1F   a. 创建一个新的散射库 ax<g0=^R   b. 散射模型命名 }iD$4\ L   c. 改变散射模型为“Tabulated BSDF”. M8\G>0Hc6   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） yQ8M >H#J   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 "EN98^ Sl   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， 3b+7^0frY#   g. 点击OK 4g>1Gqv6   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 &}>|5>cJu   /.7$`d   ~l(G6/R   脚本代码： |^Y*~d<H   Y_$^:LG   '#Language "WWB-COM" y>@v>S   r49UJE   Option Explicit h0T< :X   2IKxh   Sub Main *Hxj_   uFGv%W       'Cleanup B"7$!Co       ClearOutputWindow() / c+,   ;>inT7?3|       Print "Merging RPC Photonics BSDF Data Files" ^?E^']H)5u       SetTextColor(255,0,0) -zPm{a       Print "Note: Script should be located in the same folder as the BSDF TXT files." BXT80a\       Print "Note: Do not run this script multiple times without deleting the output file between executions." c zZrP"       SetTextColor(0,0,0) 01&*`0?   )WaX2uDA?       'Current directory of this script (should be the same as the text files being merged) qRgK_/[]       Dim cDir As String [Xs}FJ       cDir = MacroDir$ & "\" R"m.&%n   U#8\#jo       'Array which will be populated with the list of files to be merged dD[v=Z_       Dim fList() As String, curFile As String uOyLC<I/       GetFileList( cDir, fList ) )EhTM-1   h{Oz*Bq       Print "" K.:6YXVs<       Print "Files found for merging:" p3V9ikyy       For Each curFile In fList +<'uw           Print Chr(9) & curFile g|tNa/       Next !JT<(I2   )fxo)GS       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. M /n[&       Dim nameArray() As String, sampName As String Hi9 G^Q       nameArray = Split(fList(0)," 0-0.txt") B(S5+Y       sampName  = nameArray(0) sqm%iyC=q       Print "" /uy&2l       Print "Sample name: " & Chr(9) & sampName vN{vJlpY   w:m'uB%W       'Open an output file and write the FRED header data N2[, aU       Dim outFile As String +}Qv6s#       outFile = cDir & sampName & "_FRED.txt" F7k4C2r       Open outFile For Output As #1 .a 'ETNY:>       Print #1, "type bsdf_data" i; E9ZaW       Print #1, "format angles=deg bsdf=value scale=1" @/_ XS4   x(C]O,       'Loop the file list, skip the two header lines and write the remaining data to file X  !&"&n       Dim lineArray() As String, curLine As Long )OARO       For Each curFile In fList / e~           Print "Merging data from file " & curFile e1f^:C           ReadFile( cDir & curFile, lineArray ) RM? _15m           For curLine = 2 To UBound(lineArray) !1ie:z>s               Print #1, lineArray(curLine) tEi@p;Z>           Next !m w{T D       Next 1G e)p4   =2ATqb"$w       'Close the output file S+` !%hJ       Close #1 >i><s>=I`   !nP8ysB       Print "Finished merging RPC data for sample " & sampName asm[-IB2u       Print "FRED formatted data file: " & Chr(9) & outFile UiGUaBmF*   End Sub htdn$kqG    -~rr<D\   'Utility function to read the contents of a file into an array of strings. sqq/b9 uL/   Function ReadFile(ByVal fileName As String, _ kMwIu y                     ByRef lineArray() As String) As Long :kf3_?9rc   j8D$/       ReadFile = -1 73! x@Duh       Dim oFSO As Object fzGZ:L       Set oFSO = CreateObject("Scripting.FileSystemObject") L<[ ,7V       Erase lineArray 0C9QAJa   dpc=yXg>"c       Dim fid As Long ^>P@5gcoE(       If oFSO.fileexists( fileName ) Then ByB0>G''.           fid = FreeFile() ,b2O^tJF#           Open fileName For Input As fid O"2wV +9           lineArray = Split(Input(LOF(fid), fid), vbCrLf) W#JVUGYD           Close fid %8z+R m,Ot       End If 2WbZ>^:Nsk       Set oFSO = Nothing he#Tr'j       Return UBound( lineArray ) ~'PS|   tyGnG0GK   End Function 0X S' v,|   I?:+~q}lZr   Sub GetFileList( ByVal in_dir As String, _ hj #+8=                    ByRef in_flist() As String ) q)zu}m   eBLHT       'Redimension the file list array \fQgiX       Erase in_flist w oY)G7%   a*$1la'Uf       'Tracks how many files are found v J,xz*rc`       Dim fCount As Long ZQ-z2s9U       fCount = 0 +Fy-~Mq   ZRVF{D??"%       'Recurse directory and search for text files Qbe{/       Dim f As String Z{R=h7 P       f = Dir$(in_dir & "*.txt") Ff1M~MhG       While f <> "" cbg3bi           ReDim Preserve in_flist(fCount) wTJMq`sY_           in_flist(fCount) = f `P)64So-1           fCount += 1 {F{[!.           f = Dir$() .Q6{$Y%l       Wend y(p:)Iv       ReDim Preserve in_flist(fCount-1)