RPC Photonics扩散片BSDF

dW^_tzfF7   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

-< dMD_   摘要： n"d)   #PLB$ $   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。 hA,rSq   u&d v[   背景： }Mb'tGW   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。 +SA<0l   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 ^a#&wW   H'h4@S   ]B QWA   ^1Zq0   步骤 $:gSc&mx   pffw5Tc   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 5wFS.!xD   图2. RPC Photonics工程漫射体不同类型的散射数据 >*i8RqU   f_P+qm   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） \,bFm,kC?   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 %:;[M|.   例如下所示： %K7EF_%   Sample name:  EDF-C1-56 DdS3<3]A   Merging data from file EDF-C1-56 0-0.txt O<d?'{   Finished merging RPC data for sample EDF-C1-56 I^\bS   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt / -qt}   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 59NWyi4i   a. 创建一个新的散射库 89- 8v^ Pq   b. 散射模型命名 xE-`Bb   c. 改变散射模型为“Tabulated BSDF”. ND9>`I5   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） &Cpxo9-   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 [[r3fEr$!p   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， |9"^s x   g. 点击OK yb.|7U?/x   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 > Hzb0N!VJ   ![hhPYmV   KRR^?   脚本代码： t5v)6|   s1vYZ   '#Language "WWB-COM" *0@; kD=   A8Z?[,Mq!   Option Explicit E?h2e~ ,]   ,,#rv-*   Sub Main lGHu@(n<   GKx,6E#JM       'Cleanup y~ 4nF       ClearOutputWindow() ecI 2]aKi   D&6Qk&>       Print "Merging RPC Photonics BSDF Data Files" I;.E}k        SetTextColor(255,0,0) Sq8Q*       Print "Note: Script should be located in the same folder as the BSDF TXT files." G@<lwnvD*J       Print "Note: Do not run this script multiple times without deleting the output file between executions." YGpp:8pen       SetTextColor(0,0,0) a;owG/\p   #`)-$vUv^f       'Current directory of this script (should be the same as the text files being merged) `k%#0E*H       Dim cDir As String Qufv@.'AY       cDir = MacroDir$ & "\" S9#N%{8P   PEn^.v@       'Array which will be populated with the list of files to be merged /(pD^D       Dim fList() As String, curFile As String wp GnS       GetFileList( cDir, fList ) QT l._j@   Rpd/9x.)&       Print "" gw"l&r       Print "Files found for merging:" 4bi\$        For Each curFile In fList }vA nP]!A5           Print Chr(9) & curFile i\4"FO?v       Next V42*4hskL   eh/OCzWH       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Au*?)X- $       Dim nameArray() As String, sampName As String z'D{:q       nameArray = Split(fList(0)," 0-0.txt") Zy3&Zt       sampName  = nameArray(0) x[~OVG0M*       Print "" .%b_3s".       Print "Sample name: " & Chr(9) & sampName ~#km0<r?   i[^lJ)[>N       'Open an output file and write the FRED header data p[cL#fBz       Dim outFile As String . EZ{d       outFile = cDir & sampName & "_FRED.txt" $ 14DTjj       Open outFile For Output As #1 >^GCSPe       Print #1, "type bsdf_data" M`fXH 3D       Print #1, "format angles=deg bsdf=value scale=1" i/Lq2n3 )   T*~)9o       'Loop the file list, skip the two header lines and write the remaining data to file 9v,8OK)       Dim lineArray() As String, curLine As Long ]hVXFHrR       For Each curFile In fList RW^v{'o           Print "Merging data from file " & curFile ^&/&I9z           ReadFile( cDir & curFile, lineArray ) |(v=1# i           For curLine = 2 To UBound(lineArray) ?q}wl\"8               Print #1, lineArray(curLine) w$:)wyR-           Next aDv/kFfn       Next i*w-Q=   QLU;.&       'Close the output file oYErG],       Close #1 Vzm+Ew _   2Wf qgR[3       Print "Finished merging RPC data for sample " & sampName G-?9;w'@       Print "FRED formatted data file: " & Chr(9) & outFile at]Q4   End Sub o(N yOC   ?s} E<Kr   'Utility function to read the contents of a file into an array of strings. $uB(@Ft.   Function ReadFile(ByVal fileName As String, _ @W- f{V                     ByRef lineArray() As String) As Long #R4KBXN   o"M^sKz47       ReadFile = -1 CHP6H}#|g       Dim oFSO As Object { (,vm}iFL       Set oFSO = CreateObject("Scripting.FileSystemObject") &+^ Y>Ke       Erase lineArray T N aff   '[8 jm=Q#'       Dim fid As Long =e{KtX.       If oFSO.fileexists( fileName ) Then B4&pBiG&f6           fid = FreeFile() ''Ec-b6Q-           Open fileName For Input As fid V46[whL%r           lineArray = Split(Input(LOF(fid), fid), vbCrLf) .: ;Hh~           Close fid >&Q. .`q       End If BF|FW       Set oFSO = Nothing ^WPV       Return UBound( lineArray ) tSa%ZkS   t3JPxg]0k'   End Function =:8=5tj   }AYSQ~:   Sub GetFileList( ByVal in_dir As String, _ () ;7+                    ByRef in_flist() As String ) !$#4D&T   "0) G|pZI       'Redimension the file list array SJ+-H83x       Erase in_flist l #z`4<   $0 zL       'Tracks how many files are found 0\*<k`dY       Dim fCount As Long *3($s_r>       fCount = 0 cs;Gk:   tTp`e0L*m       'Recurse directory and search for text files C,u.!g;lm       Dim f As String "T=LHjE       f = Dir$(in_dir & "*.txt") 4FdH:os       While f <> "" /2cOZ1G;           ReDim Preserve in_flist(fCount) FuBRb (I           in_flist(fCount) = f m uY^Fx           fCount += 1 .6#2i <oPW           f = Dir$() H/{3 i       Wend ^ ?9 ~R"       ReDim Preserve in_flist(fCount-1)