RPC Photonics扩散片BSDF

uO$ujbWZ   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

Y^)VHE]   摘要： Q*TxjE7K   k&nhF 9Y4   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。 !$q1m@K1   (vIrXF5Dnj   背景： l<<G".?   Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 2|k*rv}l   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 }9C5U>?   -;$+`<%   39!o!_g   %EPqJ(T   步骤 *$(=I6b   QN(f8t(   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。 (4V1%0   图2. RPC Photonics工程漫射体不同类型的散射数据 >qA5    zIbl[[M&   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） ;{|a~e?Y   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 JxQwxey{   例如下所示： 7YbI|~   Sample name:  EDF-C1-56 l,/q#)5[   Merging data from file EDF-C1-56 0-0.txt hMJ \a   Finished merging RPC data for sample EDF-C1-56 [BhpfZNKRA   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Y6A]dk   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 C!w@Naj   a. 创建一个新的散射库 bcpH|}[F)   b. 散射模型命名 ,IUMH]D   c. 改变散射模型为“Tabulated BSDF”. /3%]Ggwe   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 ） *9^CgLF   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。 4x'^?0H@   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， mxHNK4/   g. 点击OK v>3ctP{   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 9\)NFZ3Mz   ,Ucb)8a   wrG*1+r   脚本代码： `n-e.{O((   i/ xPO   '#Language "WWB-COM" #py7emu   d$rJW m5H   Option Explicit z@y* jT   cXJgdBwo   Sub Main | 7>1)   af{;4Cr       'Cleanup xSb/98;       ClearOutputWindow() 5d}PrYa   ?vRz}hiy       Print "Merging RPC Photonics BSDF Data Files" dab>@z4       SetTextColor(255,0,0) 3:Co K#       Print "Note: Script should be located in the same folder as the BSDF TXT files." e;3$7$n Pv       Print "Note: Do not run this script multiple times without deleting the output file between executions." ,h/0:?R KW       SetTextColor(0,0,0) glHag"(   54F([w       'Current directory of this script (should be the same as the text files being merged) 4BEVG&Ks       Dim cDir As String mKp UEJ<a       cDir = MacroDir$ & "\" |r- <t   8gC(N3/E"       'Array which will be populated with the list of files to be merged QHs=Zh ;"       Dim fList() As String, curFile As String N83RsL "}_       GetFileList( cDir, fList ) d+T]EpQJ*   <Mc:Cg8>       Print "" $Z28nPd/       Print "Files found for merging:" uFdSD       For Each curFile In fList 6\o.wq           Print Chr(9) & curFile 1Y9Ye?~jd       Next <2cq 0*$   Y_/Kd7,\~       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. UjKHGsDi4       Dim nameArray() As String, sampName As String N[pk@M\vX       nameArray = Split(fList(0)," 0-0.txt") OD1ns       sampName  = nameArray(0) 6l_8Q w*5I       Print "" R&xD|w8UjM       Print "Sample name: " & Chr(9) & sampName hChM hc   6AQ;P       'Open an output file and write the FRED header data g"Ii'JZ?       Dim outFile As String 3al5Vu2:       outFile = cDir & sampName & "_FRED.txt" CKBi-q FH       Open outFile For Output As #1 %Vt@7SwRJ       Print #1, "type bsdf_data" G~esSL^G/       Print #1, "format angles=deg bsdf=value scale=1" &H4UVI   D[tGbk       'Loop the file list, skip the two header lines and write the remaining data to file wG{obsL.!       Dim lineArray() As String, curLine As Long G,"$Erx       For Each curFile In fList W' 2)$e           Print "Merging data from file " & curFile O_iX1@SW           ReadFile( cDir & curFile, lineArray ) ;%k% AXw           For curLine = 2 To UBound(lineArray) 4x C0Aw               Print #1, lineArray(curLine) JnsXEkM)           Next VR:b1XWX       Next WG}QLcP   2Qk\}KWs       'Close the output file 0~S<}N       Close #1 nVM`&azD   `UJW :qqW       Print "Finished merging RPC data for sample " & sampName AT9SD vJ       Print "FRED formatted data file: " & Chr(9) & outFile [&`>&u@MK   End Sub cEQa 6   /gdo~   'Utility function to read the contents of a file into an array of strings. pF!vW   Function ReadFile(ByVal fileName As String, _ x)U;                     ByRef lineArray() As String) As Long g1{wxBFE   Bpp9I;)c       ReadFile = -1 L"-&B$B:       Dim oFSO As Object %4-pw|':       Set oFSO = CreateObject("Scripting.FileSystemObject") 'Qfy+_0       Erase lineArray v4.V%tg!   p -6.:y       Dim fid As Long HZ}'W<N       If oFSO.fileexists( fileName ) Then {r}}X@|5           fid = FreeFile() >WEg8'#O           Open fileName For Input As fid 7>mYD3           lineArray = Split(Input(LOF(fid), fid), vbCrLf) *Xnq1_K}           Close fid 52 A=c1kb       End If 1`AE]       Set oFSO = Nothing h ,n!x:zy@       Return UBound( lineArray ) 68>zO%   MtB:H*pM   End Function 3//v{ce1]   CyU>S}t   Sub GetFileList( ByVal in_dir As String, _ 24T w1'mW                    ByRef in_flist() As String ) ujh4cp   ~zX5}U<R       'Redimension the file list array %jf gncW       Erase in_flist 'ng/A4   sg2C_]i,H       'Tracks how many files are found iTvCkb48m       Dim fCount As Long H}~^,B2;       fCount = 0 qprOxP r   gA|j\T{c       'Recurse directory and search for text files }.vy|^X       Dim f As String ZM.g+-9       f = Dir$(in_dir & "*.txt") ZSSgc0u^?       While f <> "" R}Y=!qjYE=           ReDim Preserve in_flist(fCount) F{+`F<r           in_flist(fCount) = f "8]170           fCount += 1 J)-> 7h=           f = Dir$() "F}Ip&]hAG       Wend FHC7\#p/9Z       ReDim Preserve in_flist(fCount-1)