RPC Photonics扩散片BSDF

PZRn6Tc   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

]\,uF8gg)   摘要： 8Vhck-wF   +JS/Z5dl+}   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。 )2Ru!l#   gam#6 s   背景： m<"fRT!Y   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。 uo'31V0   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 I''R\Bp   / &D$kxz   hdJwNmEA>   bH&)r n   步骤 q,+kPhHEgy   xTFrrmxOf   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 ~uR6z//%   图2. RPC Photonics工程漫射体不同类型的散射数据 ]_: TrH   f H|QAMfOu   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） 83ic@[   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 !M&un*   例如下所示： pNE\@U|4E   Sample name:  EDF-C1-56 vd7N&c9   Merging data from file EDF-C1-56 0-0.txt fb.\V]K   Finished merging RPC data for sample EDF-C1-56 h<'5q&y   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt .A7tq   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 zB6u-4^wT   a. 创建一个新的散射库 -N8cjr4l   b. 散射模型命名 m_!vIUOz   c. 改变散射模型为“Tabulated BSDF”. 4[,B;7   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） v<3o[mq   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 0SYf<$   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， Z\=04[   g. 点击OK .d~]e2x   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 !\#Wk0Ku   K+@eH#Cv,(   '*N9"C   脚本代码： 0YpiHoM   B(\r+"PB   '#Language "WWB-COM" yI.}3y{^5   wL-ydMIx   Option Explicit 2@3.xG   Awa|rIM   Sub Main OVUs]uK   ,]uX:h-EM       'Cleanup 71l"m^Z3zy       ClearOutputWindow() C](z#c~c   cNuHXaWp       Print "Merging RPC Photonics BSDF Data Files" Ac[|MBaF       SetTextColor(255,0,0) j(%gMVu       Print "Note: Script should be located in the same folder as the BSDF TXT files." )ew[ Ak|       Print "Note: Do not run this script multiple times without deleting the output file between executions." (~ ]g,*+       SetTextColor(0,0,0) v;fJM5PA   ,ykPQzO       'Current directory of this script (should be the same as the text files being merged) T,WKoB       Dim cDir As String 1c)\       cDir = MacroDir$ & "\" 0Oc}rRH(C   (}{_]X|e       'Array which will be populated with the list of files to be merged ` /I bWu       Dim fList() As String, curFile As String X`fhln9N       GetFileList( cDir, fList ) KbwTj*k[   $bZu^d,       Print "" qukjS#>+       Print "Files found for merging:" 6wb^*dD92       For Each curFile In fList ~5r=FF6            Print Chr(9) & curFile "YG\       Next aFRTNu/r   |;A9A's       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Qj 6gg       Dim nameArray() As String, sampName As String u/gm10<OWa       nameArray = Split(fList(0)," 0-0.txt") 3z ,v#2       sampName  = nameArray(0) 6kt]`H`cfJ       Print "" &GdL 9!hH       Print "Sample name: " & Chr(9) & sampName 1mJbQ#5   mb0n}I_AC       'Open an output file and write the FRED header data 4? m/*VV       Dim outFile As String wv, GBZ-f       outFile = cDir & sampName & "_FRED.txt" cT-K@dg       Open outFile For Output As #1 C9<4~IM w       Print #1, "type bsdf_data" brg":V1a       Print #1, "format angles=deg bsdf=value scale=1" @J-plJ4e   1@A7h$1P       'Loop the file list, skip the two header lines and write the remaining data to file Md8(`@`o       Dim lineArray() As String, curLine As Long e7@li<3>d       For Each curFile In fList jrm0@K+<IA           Print "Merging data from file " & curFile RVc)") hQj           ReadFile( cDir & curFile, lineArray ) ?^LG hdR            For curLine = 2 To UBound(lineArray) { EA2               Print #1, lineArray(curLine) H Uj+-           Next 94Xjz(       Next 2Sge   f%2%T'Q       'Close the output file %6AYCN?Ih       Close #1 S?*^>Y-e;   C/F@ ]_y       Print "Finished merging RPC data for sample " & sampName |/@0~O(6       Print "FRED formatted data file: " & Chr(9) & outFile sf Dg/ a   End Sub I+0c8T(:   fO*)LPen.z   'Utility function to read the contents of a file into an array of strings. y0,Ft/D   Function ReadFile(ByVal fileName As String, _ saatU;V                     ByRef lineArray() As String) As Long oG!6}5   '.pgXsC:=?       ReadFile = -1 \WWG>OUh.U       Dim oFSO As Object csYy7uzi       Set oFSO = CreateObject("Scripting.FileSystemObject") e\`wlaP,       Erase lineArray 49o\^<4b   SijtTY#r       Dim fid As Long mv{<'       If oFSO.fileexists( fileName ) Then xXORIlD           fid = FreeFile() a;%I\w;2           Open fileName For Input As fid ;:P7}v fz!           lineArray = Split(Input(LOF(fid), fid), vbCrLf) C?,*U           Close fid cI5N"U@yN       End If 9+}cE**=d       Set oFSO = Nothing JlUb0{8PE       Return UBound( lineArray ) 4bnt=5]   f6Ml[!aU   End Function 0}B?sNr   bV_j`:MD   Sub GetFileList( ByVal in_dir As String, _ Z%#^xCz;w>                    ByRef in_flist() As String ) *m*`}9   <P-$RX       'Redimension the file list array J<rlz5':       Erase in_flist 2SYKe$e   n[|6khOL-       'Tracks how many files are found x.b a|:5       Dim fCount As Long fTcY"A,2       fCount = 0 =LOk 13l\"   *,17x`1e       'Recurse directory and search for text files M_Bu,<q^       Dim f As String )AI?x@       f = Dir$(in_dir & "*.txt") c+8V|'4       While f <> "" ZNi +Aw$u           ReDim Preserve in_flist(fCount) B_hPcmB           in_flist(fCount) = f nWk e#{[           fCount += 1 n&$/Q$d&           f = Dir$() 5Dd:r{{ Q       Wend LX\)8~dp       ReDim Preserve in_flist(fCount-1)