RPC Photonics扩散片BSDF

],!\IqO   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

s.<olxXRW   摘要： *U( 1iv0n   >&*6Fqd   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。 V;M3z9xd   e_YW~z=6t   背景： s4MNVT   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。 e@='Q H   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 $ ijx#a&O   tpN]evp|   =4YbVA+(   +J\L4ri k   步骤 j4.Qvj >:4   Q3 K ;kS   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。 113Z@F   图2. RPC Photonics工程漫射体不同类型的散射数据 (2\li{$e   @C!JtgO%   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） fs]#/*RR   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 =YS!soO   例如下所示： *O"%tp6   Sample name:  EDF-C1-56 rU/-Wq`B   Merging data from file EDF-C1-56 0-0.txt E#yCcC!wMY   Finished merging RPC data for sample EDF-C1-56 jEC'l]l   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt {Hktu|   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 sg'Y4   a. 创建一个新的散射库 'US:Mr3   b. 散射模型命名 `XQx$I   c. 改变散射模型为“Tabulated BSDF”. Vvxc8v:   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 ） 31 KDeFg   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。 KUl Zk^a   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， N[|by}@n   g. 点击OK C=xo&I7   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 umq$4}T'$   z|t.y.JX   {Sd@u$&   脚本代码： 6/p ]jN   -ucz+{   '#Language "WWB-COM" v.~Nv@+kR   *@b~f&Lx6   Option Explicit g7E`;&f   g4BwKENM   Sub Main Z7K! "I   LbtlcpF*~5       'Cleanup pn ~/!y       ClearOutputWindow() BP7<^`i&   >X@.f1/5X       Print "Merging RPC Photonics BSDF Data Files" $=;bccIob       SetTextColor(255,0,0) ^^j|0qshL       Print "Note: Script should be located in the same folder as the BSDF TXT files." }RC.Q`b       Print "Note: Do not run this script multiple times without deleting the output file between executions." VC_3ll]vr       SetTextColor(0,0,0) g%<{G/Tz   -7C=- \]       'Current directory of this script (should be the same as the text files being merged) JsAb q       Dim cDir As String vl#V-UW$4P       cDir = MacroDir$ & "\" /_ hfjCE   +ik N) D       'Array which will be populated with the list of files to be merged 9I^H)~S       Dim fList() As String, curFile As String uMq\] ;7I       GetFileList( cDir, fList ) B8BY3~}]   A7I8Z6 &       Print "" 1*eWvYo1       Print "Files found for merging:" Z;dwn~Tw       For Each curFile In fList R[ +]d|L           Print Chr(9) & curFile %Pt[3>       Next Ay[9k=q]   lN]X2 4t       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. E`sapk       Dim nameArray() As String, sampName As String Si%Eimiq       nameArray = Split(fList(0)," 0-0.txt") i >/@]2       sampName  = nameArray(0) XQJV.SVS       Print "" 9Rt(G_'       Print "Sample name: " & Chr(9) & sampName |~T+f&    'K N!m| z       'Open an output file and write the FRED header data u0$5Fd&X       Dim outFile As String Qg8eq_m(       outFile = cDir & sampName & "_FRED.txt" X~/9Vd g       Open outFile For Output As #1 hGaYQgGq       Print #1, "type bsdf_data" (HP={MrV       Print #1, "format angles=deg bsdf=value scale=1" aV0;WH_3   aX%g+6t2       'Loop the file list, skip the two header lines and write the remaining data to file mhHm#       Dim lineArray() As String, curLine As Long )I0g&e^Tzy       For Each curFile In fList T J"{nB           Print "Merging data from file " & curFile B1AF4}~5           ReadFile( cDir & curFile, lineArray ) D-;43>yi<           For curLine = 2 To UBound(lineArray) [$Xu               Print #1, lineArray(curLine) rO2PbF3           Next 4QN6BZJ5       Next LnACce ?b   nqw*oLFQ       'Close the output file M3xi 0/.       Close #1 rt4|GVa   N'1[t       Print "Finished merging RPC data for sample " & sampName v(WL 3[y;       Print "FRED formatted data file: " & Chr(9) & outFile Y_ u7 0@`   End Sub k?_$h<Y   :O2v0Kx   'Utility function to read the contents of a file into an array of strings. ^gVbVz[17   Function ReadFile(ByVal fileName As String, _ <MDFfnj                     ByRef lineArray() As String) As Long JO;`Kz_$   Z{>Y':\?<       ReadFile = -1 @zpHemdB       Dim oFSO As Object m:o$|7r       Set oFSO = CreateObject("Scripting.FileSystemObject") (4/`@;[       Erase lineArray ]&%X(jWyn   Wug?CFX+T       Dim fid As Long :r[-7 [/       If oFSO.fileexists( fileName ) Then FV<^q|K/(]           fid = FreeFile() |@uhq>&           Open fileName For Input As fid fTnyCaB           lineArray = Split(Input(LOF(fid), fid), vbCrLf) sZ(Q4)r           Close fid 6(RqR       End If q.Aw!]:!       Set oFSO = Nothing ?%TM7Z4       Return UBound( lineArray ) a>e 1jM[   9hi(P*%q   End Function CpJXLc3_d5   pl? J<48   Sub GetFileList( ByVal in_dir As String, _ bu!<0AP"N+                    ByRef in_flist() As String ) u K&_IE}   xo@/k       'Redimension the file list array 7qdl,z       Erase in_flist 5EZr"   T"jDq1C/,E       'Tracks how many files are found b8xfV{3L       Dim fCount As Long 5nlyb,"^g       fCount = 0 G7#~=W 2M   Pn){xfqDl       'Recurse directory and search for text files !haXO       Dim f As String MhXm-<4       f = Dir$(in_dir & "*.txt") <UHf7:0V       While f <> "" MkIO0&0O           ReDim Preserve in_flist(fCount) h3ZL0Fi*           in_flist(fCount) = f L ~'N6           fCount += 1 i 7E7%~S           f = Dir$() UVi/Be#|       Wend ;C@^wI       ReDim Preserve in_flist(fCount-1)