RPC Photonics扩散片BSDF

kQe<a1 8   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

IqV"4   摘要： yH=<KYk   q_6lD~~q^   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。 sVr|kvn2    }-sh   背景： @Co6$<   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。 V,=5}qozQ   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 |$6Ten[B#   `*[\b9>   )^BZ,e   0ETT@/)]z   步骤 ?A;RTM   k-a1^K3   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 [Rub   图2. RPC Photonics工程漫射体不同类型的散射数据 ~"0{<mMcX   &"WgO!pzD   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） p+<qI~   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 P5h *RV>oS   例如下所示： j94~cYV   Sample name:  EDF-C1-56 L-)ZjXzk   Merging data from file EDF-C1-56 0-0.txt sxA]o|   Finished merging RPC data for sample EDF-C1-56 ;~DrsQb   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt eI:x4K,#   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 c7{s'ifG   a. 创建一个新的散射库 IP$eJL[&D"   b. 散射模型命名 %,1TAmJfHa   c. 改变散射模型为“Tabulated BSDF”. /k?l%AH   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 ） r>! @Z2%s   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。 QnOs8%HS-   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|?sNM<J3   g. 点击OK 5x|$q kI   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 %]Nm'"Y`U   % >a /m.$   5FuV=Yuc   脚本代码： w)* H&8h@   Du +_dr^4   '#Language "WWB-COM" Yr~wsE/   ^V1\boo=   Option Explicit Dq%}({+   rXzq:   Sub Main Tc!n@!RA|   x^c,cV+*       'Cleanup =SuJ*       ClearOutputWindow() {X2uFw Gi   `n-/~7       Print "Merging RPC Photonics BSDF Data Files" /2E Q:P       SetTextColor(255,0,0) %).I&)i       Print "Note: Script should be located in the same folder as the BSDF TXT files." hrD2-S       Print "Note: Do not run this script multiple times without deleting the output file between executions." w2 V:x[       SetTextColor(0,0,0) [O'aka Q   t5_76'@cX       'Current directory of this script (should be the same as the text files being merged) h5T~dGRlR       Dim cDir As String =jh^mD&'       cDir = MacroDir$ & "\" su IYfjh   : O@(Sv       'Array which will be populated with the list of files to be merged 8+7*> FD)1       Dim fList() As String, curFile As String g$mMH       GetFileList( cDir, fList ) 7)1%Z{Dy   &hI!0DixX       Print "" )( yaX       Print "Files found for merging:" :-U&_%#w       For Each curFile In fList Pzd!"Gl9           Print Chr(9) & curFile (VmFYNt&       Next }+MA*v[06   vol (%wB       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. kG9aHWw       Dim nameArray() As String, sampName As String Vv5T(~       nameArray = Split(fList(0)," 0-0.txt") /&G|.Cx       sampName  = nameArray(0) LttA8hf5q?       Print "" Il>o60u1       Print "Sample name: " & Chr(9) & sampName Y1>OhHuN   c;]^aaQ+>       'Open an output file and write the FRED header data J#j3?qrxu       Dim outFile As String ^V9|uHOJoq       outFile = cDir & sampName & "_FRED.txt" \(=xc2       Open outFile For Output As #1 TG8U=9qt       Print #1, "type bsdf_data" p:$v,3:       Print #1, "format angles=deg bsdf=value scale=1" ? p[Rv   tI^[|@,       'Loop the file list, skip the two header lines and write the remaining data to file 4Ozcs'}       Dim lineArray() As String, curLine As Long D-t!{LA       For Each curFile In fList pbqk           Print "Merging data from file " & curFile K?e16;           ReadFile( cDir & curFile, lineArray ) %dr*dA'           For curLine = 2 To UBound(lineArray) -OmpUv-O"               Print #1, lineArray(curLine) +_vf=d           Next ! 2&)6SL/       Next +\dKe[j{g   :5&UWL|       'Close the output file d:vc)]M>f{       Close #1 xzfugW   bQ 0Ab"+D       Print "Finished merging RPC data for sample " & sampName ?li/mc.XG       Print "FRED formatted data file: " & Chr(9) & outFile U|.r -$|5P   End Sub z[Qe86L   O[L#|_BnEO   'Utility function to read the contents of a file into an array of strings. ;o;ak.dTt   Function ReadFile(ByVal fileName As String, _ #u+qV!4                     ByRef lineArray() As String) As Long }M"])B I   iqB%sIP       ReadFile = -1 @}waZ?'       Dim oFSO As Object K5^zu`19       Set oFSO = CreateObject("Scripting.FileSystemObject") ~@QAa (P.       Erase lineArray snu?+*6   }wBpBw2J       Dim fid As Long MT)q?NcG       If oFSO.fileexists( fileName ) Then lfd-!(tXD           fid = FreeFile() c05-1           Open fileName For Input As fid i|,}y`C#           lineArray = Split(Input(LOF(fid), fid), vbCrLf) 8'qlg|{!~           Close fid 9&Y|,&W       End If N7}3?wS       Set oFSO = Nothing =;Co0Q`       Return UBound( lineArray ) UA]T7r@   <-G3Qgm   End Function r58<A'#   'Ox "YE   Sub GetFileList( ByVal in_dir As String, _ y] O&w{m$                    ByRef in_flist() As String ) `m#G'E I   }.WO=IZ       'Redimension the file list array SD8>,       Erase in_flist UmMu|`   aMkuyqPf{       'Tracks how many files are found ci:|x =       Dim fCount As Long ei=u$S.       fCount = 0 9H:J&'Xi7   "H@I~X=       'Recurse directory and search for text files #uC}IX2n       Dim f As String *uccY_       f = Dir$(in_dir & "*.txt") c(b`eUOO       While f <> "" 9jx>&MnWs           ReDim Preserve in_flist(fCount) 7i02M~*uS           in_flist(fCount) = f L*4=b (3           fCount += 1 O7.eq524           f = Dir$() +7 j/.R       Wend +!nf?5;       ReDim Preserve in_flist(fCount-1)