RPC Photonics扩散片BSDF

(VB-5&b   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

9s`j@B0N57   摘要： Cbjx{   qZ rv2dT   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。 8mv}-;   31`Eq*Y)4   背景： 9 5b65f   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。 V8+8?5'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 CINC1Ll_24   t{o&$s93   X'.*I])   AlhPT (   步骤 hVdPO   \Zmn!Gg   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 3p#BEH<re   图2. RPC Photonics工程漫射体不同类型的散射数据 0qhSV B5   W B7gY\Y&M   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后）  Mt    3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 -efB8)A   例如下所示： 6}^6+@LG   Sample name:  EDF-C1-56 0mYKzJi   Merging data from file EDF-C1-56 0-0.txt {5J: ]{p   Finished merging RPC data for sample EDF-C1-56 rLJjK$_x   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt P=PVOt@ b   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 *;X,yEK[   a. 创建一个新的散射库 #S *cFnd   b. 散射模型命名 5_E,x   c. 改变散射模型为“Tabulated BSDF”. c ^%&-],   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 ） :?J0e4.]   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。 Lk:Sju   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， _0 $W;8X   g. 点击OK 5#hsy;q;[   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 .jvRUD8A7   bbAJ5EqL   0="U'|J_   脚本代码： eO?@K$I   1-:{&!   '#Language "WWB-COM" dd G5g   BY!M(X jrZ   Option Explicit O.^1r   3Q_L6Wj~   Sub Main HYWKx><   J'4V_Kjg-       'Cleanup ebmU~6v k       ClearOutputWindow() Df_*W"(v   -wUw)gJbM       Print "Merging RPC Photonics BSDF Data Files" C|H/x\?zRv       SetTextColor(255,0,0) 8CN~o|uN       Print "Note: Script should be located in the same folder as the BSDF TXT files." C Ch38qBp       Print "Note: Do not run this script multiple times without deleting the output file between executions." YpwMfl4       SetTextColor(0,0,0) V/CZcMY_   jI~GRk       'Current directory of this script (should be the same as the text files being merged) n1 kh8 ,       Dim cDir As String siK:?A@4D       cDir = MacroDir$ & "\" -eSZpzp   mjXO}q7       'Array which will be populated with the list of files to be merged ~ $QNp#dq       Dim fList() As String, curFile As String 0Er;l|       GetFileList( cDir, fList ) SJ;Kjq.Qo   , \ 6*fXc       Print ""  %3A~&       Print "Files found for merging:" ?K/N{GK%{       For Each curFile In fList BkcA_a:W           Print Chr(9) & curFile 0 $_0T       Next sUTh}.[5   Ki{]5Rz       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ,)](h+zl_6       Dim nameArray() As String, sampName As String A57e]2_       nameArray = Split(fList(0)," 0-0.txt") $TR#-q       sampName  = nameArray(0) -/z#?J\       Print "" _|qs-USA       Print "Sample name: " & Chr(9) & sampName wrmbOT   >UDb:N[       'Open an output file and write the FRED header data ,a1 1&"xl       Dim outFile As String (TQhO$,       outFile = cDir & sampName & "_FRED.txt" UYW{AG2C       Open outFile For Output As #1 ;0 No@G;z       Print #1, "type bsdf_data" 8 DE%ot       Print #1, "format angles=deg bsdf=value scale=1" =V(|3?N   hm+,o_+       'Loop the file list, skip the two header lines and write the remaining data to file .6xIg+       Dim lineArray() As String, curLine As Long -|aNHZr       For Each curFile In fList "- XJZ;5           Print "Merging data from file " & curFile 3Sclr/t           ReadFile( cDir & curFile, lineArray ) NP?hoqeKs           For curLine = 2 To UBound(lineArray) lhRo+X#G               Print #1, lineArray(curLine) i!+Wv-           Next dB%q`7O       Next wdzZ41y1   xKW`m       'Close the output file @+ee0 CLT       Close #1 q{*4BL'   s_`=ugue       Print "Finished merging RPC data for sample " & sampName 1`z^Xk8vt       Print "FRED formatted data file: " & Chr(9) & outFile | r% lJmBB   End Sub ~D$?.,=l   Q@"mL   'Utility function to read the contents of a file into an array of strings. u^NZsuak   Function ReadFile(ByVal fileName As String, _ t3b64J[A{                     ByRef lineArray() As String) As Long ?O!'ZZX   }W)c-91       ReadFile = -1 nm.~~h+8M       Dim oFSO As Object 3duWk sERC       Set oFSO = CreateObject("Scripting.FileSystemObject") c2iPm9"eh       Erase lineArray 4EtP|   d|?'yX       Dim fid As Long uv$t>_^       If oFSO.fileexists( fileName ) Then knU=#           fid = FreeFile() M^twD*           Open fileName For Input As fid *'&mcEpg           lineArray = Split(Input(LOF(fid), fid), vbCrLf) j9XRC9            Close fid Sy?O(BMo       End If Nt^9N #+N       Set oFSO = Nothing FPBO=?H.       Return UBound( lineArray ) 1s@%q <   >lg-j-pV   End Function eGi[LJ)np   `NNr]__   Sub GetFileList( ByVal in_dir As String, _ bw\a\/Dw                    ByRef in_flist() As String ) },@1i<Bb   NrrnG]#p1       'Redimension the file list array =5QP'Qt{O       Erase in_flist ci~pM<+   TDtS^(2A7K       'Tracks how many files are found N-g=_86C"       Dim fCount As Long +dIO+(&g       fCount = 0 ;E{k+vkqy   hb_J.Q       'Recurse directory and search for text files @! gJOy       Dim f As String '@epiF&       f = Dir$(in_dir & "*.txt") r6#It$NU       While f <> "" Q#} 0pq           ReDim Preserve in_flist(fCount) $B3<"           in_flist(fCount) = f vg6'^5S7           fCount += 1 L9Gxqw           f = Dir$() HpD<NVu       Wend V&75n.L       ReDim Preserve in_flist(fCount-1)