RPC Photonics扩散片BSDF

EZ)GW%Bm2   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

 =E:a\r   摘要： v'u}%FC   _S6SCSFc   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。 Zs}EGC~&   p/Lk'h~   背景： X5o{d4R L   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。 1IZTo!xi   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 @s~*>k#"#   kr5'a:F)   Yj>ezFo   8fQaMn4V   步骤 KvuM{UI5   ;%$wA5"2M   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 "$N 4S9U   图2. RPC Photonics工程漫射体不同类型的散射数据 C: a</Sl   e2MjV8Bs   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） B3V+/o6   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 H@ .1cO   例如下所示： hg}R(.1K=   Sample name:  EDF-C1-56 {$)pkhJ   Merging data from file EDF-C1-56 0-0.txt Oftjm X_   Finished merging RPC data for sample EDF-C1-56 U7d05y'   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt n.xOu`gj   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 'Rw*WK   a. 创建一个新的散射库 <+e&E9;>6   b. 散射模型命名 1Et{lrgh f   c. 改变散射模型为“Tabulated BSDF”. u#v ];6N   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） q%8Ck)xz   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 #l-/!j   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， {A8w~3F   g. 点击OK km9@*@)   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 <'z.3@D   teg[l-R"7z   e^Glgaf   脚本代码： 5tm:|.`SQ   iGsD!2   '#Language "WWB-COM" g9:V00^<   IyGW>g6_.   Option Explicit Rln@9muXA   :V:siIDn   Sub Main @!2vS@f   a #Pr)H       'Cleanup d/xGo[?$       ClearOutputWindow() Gque@u   DO9_o9'       Print "Merging RPC Photonics BSDF Data Files" h&:6S       SetTextColor(255,0,0) %pr}Xs(-f       Print "Note: Script should be located in the same folder as the BSDF TXT files." CGJ>j}C       Print "Note: Do not run this script multiple times without deleting the output file between executions." 1|xo4fmV       SetTextColor(0,0,0) %3 VToj@`>   ^ lM.lS>)       'Current directory of this script (should be the same as the text files being merged) F`JW&r\       Dim cDir As String {xJ<)^fD8       cDir = MacroDir$ & "\" n3JSEu;J   yU< "tgE       'Array which will be populated with the list of files to be merged { ^ @c96&       Dim fList() As String, curFile As String C'xWRSDO       GetFileList( cDir, fList ) $z'_Hr'   glgXSOj       Print "" d m$iiRY       Print "Files found for merging:" 5r(Y,m"?       For Each curFile In fList {.D/MdwW;           Print Chr(9) & curFile pl5Q2zq%       Next X(fT[A_2C   Qvhz$W[P>       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Wc!. {2       Dim nameArray() As String, sampName As String [gxH,=Pb       nameArray = Split(fList(0)," 0-0.txt") Kzf^ras4u       sampName  = nameArray(0) F@u>5e^6       Print "" A<<Bm M.%       Print "Sample name: " & Chr(9) & sampName ]sG^a7Z.X   cHk ?$       'Open an output file and write the FRED header data 40R7@Vaf       Dim outFile As String ipn0WQG       outFile = cDir & sampName & "_FRED.txt" Tl`HFZQ1       Open outFile For Output As #1 1OW#_ 4w/       Print #1, "type bsdf_data" /dq(Z"O_       Print #1, "format angles=deg bsdf=value scale=1" #>\%7b59>   #5}v?       'Loop the file list, skip the two header lines and write the remaining data to file { K*       Dim lineArray() As String, curLine As Long ^A' Bghy       For Each curFile In fList D!nx%%q           Print "Merging data from file " & curFile Kuy0Ci           ReadFile( cDir & curFile, lineArray ) X82 12[7           For curLine = 2 To UBound(lineArray) Q_M:v               Print #1, lineArray(curLine) N/i {j.=           Next z{ MO~d9       Next J!@`tR-   gzeTBlXg       'Close the output file 2<33BBlWA       Close #1 QTT2P(Pz   pA?2UZ       Print "Finished merging RPC data for sample " & sampName RI#o9d"x}       Print "FRED formatted data file: " & Chr(9) & outFile @'fWS^ ;&   End Sub 3KN>t)A#   (7J (.EG2e   'Utility function to read the contents of a file into an array of strings.  j2%?-(U   Function ReadFile(ByVal fileName As String, _ gO ,2:,                     ByRef lineArray() As String) As Long a?P$8NLr   >{@:p`*       ReadFile = -1 vD'YLn%Q       Dim oFSO As Object _rjB.       Set oFSO = CreateObject("Scripting.FileSystemObject") do&0m[x%       Erase lineArray a0=>@?   E{W(5.kb;i       Dim fid As Long 85 <%L:EC       If oFSO.fileexists( fileName ) Then n+%tu"e           fid = FreeFile() yi@mf$A|           Open fileName For Input As fid 6 ~d\+aV           lineArray = Split(Input(LOF(fid), fid), vbCrLf) 6V^KOG           Close fid _l||69|.       End If iyr'9BA       Set oFSO = Nothing c?XqSK`',Z       Return UBound( lineArray ) }j6<S-s~   /o]j   End Function A!.* eIV|   \bzT=^Z;2   Sub GetFileList( ByVal in_dir As String, _ 3E]IEf                    ByRef in_flist() As String ) V^5Z9!    "'\f?A 9       'Redimension the file list array ]n$&|@       Erase in_flist 2#g4R   rtY4B~_       'Tracks how many files are found ~u+|NtF       Dim fCount As Long }}MZgm~U)       fCount = 0 8j< + ' R   Qb~&a1&s#       'Recurse directory and search for text files %eDJ]\*^X       Dim f As String c3G&)gU4q       f = Dir$(in_dir & "*.txt") F\(7B#       While f <> "" t?404           ReDim Preserve in_flist(fCount) 4[^lE?+           in_flist(fCount) = f sksop4gu5           fCount += 1 `UH 1B/           f = Dir$() hDc)\vzr       Wend W99Hq1W;r       ReDim Preserve in_flist(fCount-1)