RPC Photonics扩散片BSDF

,pM~Phmp   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

mk(O..)2   摘要： >Akrbmh5   #?\$*@O   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。 -^LUa]"E   /j/,@,lw7z   背景： Veo*-sl   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。 i8iv{e2   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 %sxLxx_x!   ZKy) F-yX   q,`"Z)97   v%v(-, _q   步骤 ]L+YnZ?6   3*)<Y}Tc   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。 fFDI qX   图2. RPC Photonics工程漫射体不同类型的散射数据 %:2EoXN"   5pSo`)   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） zx` %)r   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 POvxZU   例如下所示： = ^8*]/k   Sample name:  EDF-C1-56 R= ,jqW<   Merging data from file EDF-C1-56 0-0.txt kt`_n+G   Finished merging RPC data for sample EDF-C1-56 )4:K@   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt [.J&@96,b   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 j/.$ (E    a. 创建一个新的散射库 p]h;M   b. 散射模型命名 -#< 6   c. 改变散射模型为“Tabulated BSDF”. 8T6LD   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 ） H#H@AY3Y   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。 ?*DM|hzOi   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， 5Ku=Xzvq   g. 点击OK Y-2IAJHS8   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 #b~B 0:U   ot\  FZ   `HVS}}{a   脚本代码： T_t5Tg~i[N   0s9-`nHen|   '#Language "WWB-COM" :ohGG ,`Dh   LS ewMj   Option Explicit yS#)F.   42/MBP` \Y   Sub Main z$g cK>@l   $Lj~ge3#       'Cleanup 7Qdf#DG       ClearOutputWindow() ')R+Z/hG.   Cws;6i*=@       Print "Merging RPC Photonics BSDF Data Files" L hp       SetTextColor(255,0,0) f^JiaU4 [       Print "Note: Script should be located in the same folder as the BSDF TXT files." PP*6nW8       Print "Note: Do not run this script multiple times without deleting the output file between executions." (g" {A       SetTextColor(0,0,0) 8y:/!rRN   SjosbdD       'Current directory of this script (should be the same as the text files being merged) vCvjb\S       Dim cDir As String Zv]'9,cbk       cDir = MacroDir$ & "\" %x'}aTa   i Gq%|o>       'Array which will be populated with the list of files to be merged yMG(FAyu       Dim fList() As String, curFile As String [^Z)f<l       GetFileList( cDir, fList ) @%lkRU)   &9Y ^/W       Print "" 6a*?m{       Print "Files found for merging:" Pj-.oS2dA       For Each curFile In fList mkE_ a>           Print Chr(9) & curFile Yg/g9$'       Next 45.<eWH$*(   A<h^.{       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Vc[aNpE       Dim nameArray() As String, sampName As String l4s*+H$vd?       nameArray = Split(fList(0)," 0-0.txt") 1d$qr`       sampName  = nameArray(0) @V?T'@W7D       Print "" $e~MKLd       Print "Sample name: " & Chr(9) & sampName &Fiesi!tET   V` T l$EF       'Open an output file and write the FRED header data c,2OICj       Dim outFile As String H(hE;|q/       outFile = cDir & sampName & "_FRED.txt" ^4b;rLfk@       Open outFile For Output As #1 6i+<0b}!/       Print #1, "type bsdf_data" Y#,&Tu       Print #1, "format angles=deg bsdf=value scale=1" z@g%9|U   (ZPl~ZO       'Loop the file list, skip the two header lines and write the remaining data to file c@ E;v<r'       Dim lineArray() As String, curLine As Long 0 k.\o"y       For Each curFile In fList eo@kn yA<&           Print "Merging data from file " & curFile z!M #           ReadFile( cDir & curFile, lineArray ) <4LW.q           For curLine = 2 To UBound(lineArray) M7[GwA[Z +               Print #1, lineArray(curLine) KuRJo]           Next ,i jB3J       Next |oWl9j]Z   ;AG&QdTMh       'Close the output file "MvSF1       Close #1 vbD""   Y{Ff I+       Print "Finished merging RPC data for sample " & sampName hgj ]Jr       Print "FRED formatted data file: " & Chr(9) & outFile cP",szcY   End Sub n^q%_60H   6b7c9n Z   'Utility function to read the contents of a file into an array of strings. PNo9.-@G   Function ReadFile(ByVal fileName As String, _  bUsX~R-                     ByRef lineArray() As String) As Long /1v:eoF;   "38L ,PW0Z       ReadFile = -1 =@nE:uto]       Dim oFSO As Object VA>0Y        Set oFSO = CreateObject("Scripting.FileSystemObject") 6 HguZ_jC       Erase lineArray v.&c1hKHb   =]r2;014       Dim fid As Long :GN++\1pw       If oFSO.fileexists( fileName ) Then MK-+[K           fid = FreeFile() xHCdtloi?I           Open fileName For Input As fid e^<'H           lineArray = Split(Input(LOF(fid), fid), vbCrLf) 'yosDT2{#           Close fid V'tqsKQ !       End If G|*&owJ       Set oFSO = Nothing <O1os"w       Return UBound( lineArray ) [_KV;qS%/   $dxA7 `L   End Function ;PB_@Zg   -e_ |^T"   Sub GetFileList( ByVal in_dir As String, _ Z l;TS%$                    ByRef in_flist() As String ) T, +=ka$   ,1g_{dMx       'Redimension the file list array >=d 5Scix       Erase in_flist F [Lg,}   I94-#*~I       'Tracks how many files are found UlWm). b;v       Dim fCount As Long gAh#H ?MM       fCount = 0 &"?99E>   yM}3u4FG       'Recurse directory and search for text files P:_bF>r ?       Dim f As String M}j[{wW3       f = Dir$(in_dir & "*.txt") ,J'_Vi       While f <> "" obGhO           ReDim Preserve in_flist(fCount) 1 +s;a]-C           in_flist(fCount) = f !g`I*ZE+e           fCount += 1 734t           f = Dir$() @U4hq7xzV2       Wend n|pdYe8\       ReDim Preserve in_flist(fCount-1)