RPC Photonics扩散片BSDF

}OJ,<!v2pc   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

Gy3t    摘要： ;ATn&   ]9 ArT$   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。 m|c5X)}-   ZDhl$m[m   背景： CZ~%qPwDw   Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 Wifr%&t{J   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 *oW^P~m/   d.)%C]W{   ij|+MX   ` &E-   步骤 qGYru1   @j{n V@|   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 T ``O!>J   图2. RPC Photonics工程漫射体不同类型的散射数据 5?yc*mOZ   U7(t >/   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） m0a<~   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 kzb%= EI   例如下所示： < 9 vS   Sample name:  EDF-C1-56 }23#z   Merging data from file EDF-C1-56 0-0.txt ~R$Ko( N   Finished merging RPC data for sample EDF-C1-56 ^]_5oFRIj   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt PIthv[F   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 XSv)=]{   a. 创建一个新的散射库 03$lgD Q   b. 散射模型命名 P AcbC|y   c. 改变散射模型为“Tabulated BSDF”. Ia'm9Z*   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） zNo(|;19   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 ]CnqPLqL   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， X *fle   g. 点击OK ,RYahu   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 x392uS$#   \qA^3L~;5   _]/&NSk   脚本代码： {T=rsPp<@   (e~vrSk+)~   '#Language "WWB-COM" aP}%&{iC*   N =0R6{'   Option Explicit A:JWUx   jwW6m@+   Sub Main *qN(_   @XSx oUF\       'Cleanup {-'S#04       ClearOutputWindow() HEMq4v4   % QKlvmI"       Print "Merging RPC Photonics BSDF Data Files" efnj5|JSV       SetTextColor(255,0,0) I~f8+DE)       Print "Note: Script should be located in the same folder as the BSDF TXT files." a=%QckR*       Print "Note: Do not run this script multiple times without deleting the output file between executions." .o_?n.H'&       SetTextColor(0,0,0) d$O)k+j   NU#rv%p       'Current directory of this script (should be the same as the text files being merged) D,)^l@UP       Dim cDir As String xdV $dDCT       cDir = MacroDir$ & "\" {R{Io|   noLb       'Array which will be populated with the list of files to be merged +'{@Xe}       Dim fList() As String, curFile As String 1 xu2$x.b       GetFileList( cDir, fList ) DP-euz   >8>}o4Q/X       Print "" d O'apey       Print "Files found for merging:" Ou'<9m !9       For Each curFile In fList w-3 B~e           Print Chr(9) & curFile ,VTX7 vaH       Next ROfr   !~5=tK       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. H5'Le{       Dim nameArray() As String, sampName As String wwI'n*Q'$       nameArray = Split(fList(0)," 0-0.txt") _;x7vRWmN       sampName  = nameArray(0) DX$zzf       Print "" =>Md>VM       Print "Sample name: " & Chr(9) & sampName rdY/QvP0=   zV<vwIUrr       'Open an output file and write the FRED header data b#2$Pd:(       Dim outFile As String s/=.a2\       outFile = cDir & sampName & "_FRED.txt" SA'c}gP       Open outFile For Output As #1 61}hB>TT:       Print #1, "type bsdf_data" |x ~<Dc>0*       Print #1, "format angles=deg bsdf=value scale=1" |n_es)A   1}$GVb%i       'Loop the file list, skip the two header lines and write the remaining data to file 4qc0QA%       Dim lineArray() As String, curLine As Long *G,'V,?       For Each curFile In fList k.dQ;v}           Print "Merging data from file " & curFile |##rs           ReadFile( cDir & curFile, lineArray ) 'J=knjAT           For curLine = 2 To UBound(lineArray) 6IQkP9P(               Print #1, lineArray(curLine) +mqz)- x           Next my|UlZ(qg       Next e=<%{M&   RlH~<|XK       'Close the output file 01 -n_ $b       Close #1 4)4E/q/5   ~_YU%y       Print "Finished merging RPC data for sample " & sampName a=!I(50       Print "FRED formatted data file: " & Chr(9) & outFile E+.%9EKU   End Sub t;~H6   \B<A.,i4   'Utility function to read the contents of a file into an array of strings. 9j6   Function ReadFile(ByVal fileName As String, _ Q5N;MpJ-                     ByRef lineArray() As String) As Long f/VrenZ_   PilV5Gg       ReadFile = -1 9u->.O: p       Dim oFSO As Object YVEin1]       Set oFSO = CreateObject("Scripting.FileSystemObject") )7j CEA03       Erase lineArray f/&k$,w   0qV"R7TW       Dim fid As Long ).Ei:/*j       If oFSO.fileexists( fileName ) Then q[}[w!to           fid = FreeFile() ;~>E^0M           Open fileName For Input As fid KP[H&4eoC           lineArray = Split(Input(LOF(fid), fid), vbCrLf) .$k2.-k           Close fid VgSk\:t       End If U/|H%b       Set oFSO = Nothing _cW(R,i       Return UBound( lineArray ) qU1^ K   k$hNibpkt   End Function $2M dxw5   8w[nY.#T   Sub GetFileList( ByVal in_dir As String, _ VS:UVe                    ByRef in_flist() As String ) l5 m5H,`   --~m{qmy       'Redimension the file list array <Rl:=(]i~       Erase in_flist 8-wW?YTG   2`o}neF{       'Tracks how many files are found Ifc}=:nr       Dim fCount As Long 0> 6;,pd"       fCount = 0 wK7wu.   A!K/92[#@       'Recurse directory and search for text files LE|*Je3a       Dim f As String u I \zDR       f = Dir$(in_dir & "*.txt") ;,8bb(j       While f <> "" O@ GEl           ReDim Preserve in_flist(fCount) 8"#Ix1#           in_flist(fCount) = f 4RH'G nLa           fCount += 1 g36\%L           f = Dir$() }Ot I8;>       Wend =!G3YZ       ReDim Preserve in_flist(fCount-1)