RPC Photonics扩散片BSDF

'w=|uE {^   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

FB?~:7+'   摘要： I #1~CbR   E_=F'sP?   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。 7G_<+rn   n!z!fh   背景： C})Dvh   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。 3 2 i6j   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 g}0K@z3   Br 9j)1;   CnB[ImMs(A   f/J/tt   步骤 -kk7y   |2l-s 1|y   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。 L4Jm8sy{   图2. RPC Photonics工程漫射体不同类型的散射数据 jM$bWtq2   "/6#Z>y   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） >}*W$i   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 !s-A`} s+   例如下所示： eP]y\S* P   Sample name:  EDF-C1-56 #S?^?3d   Merging data from file EDF-C1-56 0-0.txt by>%}#M   Finished merging RPC data for sample EDF-C1-56 vm|u~Yd,s   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt #$BFTlm|   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 X0 |U?Ib?   a. 创建一个新的散射库 Vbv^@Kp   b. 散射模型命名 B9NUafK=   c. 改变散射模型为“Tabulated BSDF”. 0FcDO5ia   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） ="$w8iRU   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。 ,CyX*k8o   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， v<v;ZR)   g. 点击OK mj'~-$5T   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 5&s6(?,Eu   jz<}9Kze   PFX,X   脚本代码： Xq$-&~    twr{jdY9   '#Language "WWB-COM" 4nm.ea|   hOB<6Tm[   Option Explicit nZB~l=   >`03EsU   Sub Main t[q2W"#.   V| Fo@       'Cleanup r:V bjmL       ClearOutputWindow() l!:bNMd   "~ID.G|<       Print "Merging RPC Photonics BSDF Data Files" H"/JR       SetTextColor(255,0,0) =7+%31       Print "Note: Script should be located in the same folder as the BSDF TXT files." PFp!T [)       Print "Note: Do not run this script multiple times without deleting the output file between executions." o?}dHTk7       SetTextColor(0,0,0) S Q:H2vvD   5b"=m9{g       'Current directory of this script (should be the same as the text files being merged) ZOfv\(iJ;       Dim cDir As String AHs%?5YTY;       cDir = MacroDir$ & "\" 4|_xz;i   HVA:|Z19       'Array which will be populated with the list of files to be merged /4Wf\ Zu       Dim fList() As String, curFile As String fh`Y2s|:7R       GetFileList( cDir, fList ) !f(A9V   tkV[^OeU>       Print ""  ="]r{       Print "Files found for merging:" B`QF;,3S       For Each curFile In fList S=P}Jpq?Y;           Print Chr(9) & curFile WILa8"M       Next C2R"96M7 q   sBZn0h@       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. O83J[YuzjN       Dim nameArray() As String, sampName As String #6c,_!       nameArray = Split(fList(0)," 0-0.txt") 6xx.Z3v       sampName  = nameArray(0) :i>LESJq       Print "" !7\dr )       Print "Sample name: " & Chr(9) & sampName Z]Xa:[   ]uFJ~:R       'Open an output file and write the FRED header data fZf>>mu@r'       Dim outFile As String #8t=vb3       outFile = cDir & sampName & "_FRED.txt" gtH^'vFZ       Open outFile For Output As #1 WY|~E %k       Print #1, "type bsdf_data" x=rMjz-`_       Print #1, "format angles=deg bsdf=value scale=1" -}TP)/!,*   m>Wt'Cc       'Loop the file list, skip the two header lines and write the remaining data to file qWK}       Dim lineArray() As String, curLine As Long >AV 9 K       For Each curFile In fList x=>dmi3           Print "Merging data from file " & curFile =?Ry,^=b           ReadFile( cDir & curFile, lineArray ) pWzYC@_W           For curLine = 2 To UBound(lineArray) Mm8_EjMp               Print #1, lineArray(curLine) #(qvhoi7lM           Next br88b`L       Next ;PMPXN'z6   8ZV!ld       'Close the output file G?F!Z"S       Close #1 ksU& q%1   U!+O+(       Print "Finished merging RPC data for sample " & sampName y+BiaD!U       Print "FRED formatted data file: " & Chr(9) & outFile Wp = ]YO   End Sub ,hNs{-*   '`}D+IQ(j   'Utility function to read the contents of a file into an array of strings. wIRU!lIF9   Function ReadFile(ByVal fileName As String, _ $Rze[3                     ByRef lineArray() As String) As Long zz3{+1w]   xM)P=y_!M+       ReadFile = -1 Wx/PD=Sf&       Dim oFSO As Object lz0dt<8eP       Set oFSO = CreateObject("Scripting.FileSystemObject") W{JR%Sq$       Erase lineArray -GL.8"c[   71(ppsHk       Dim fid As Long ii`,cJl       If oFSO.fileexists( fileName ) Then pPsTgGai           fid = FreeFile() hHMp=8J7           Open fileName For Input As fid uAYDX<Ja9           lineArray = Split(Input(LOF(fid), fid), vbCrLf) ~]%re9jGW           Close fid (Z@-e^R       End If /3L4K       Set oFSO = Nothing D@w&[IF       Return UBound( lineArray ) NB3+kf,   2bXCFv7}   End Function %j2:W\g:   cP L6(&7   Sub GetFileList( ByVal in_dir As String, _ 3 P\4K                    ByRef in_flist() As String ) )q!dMZ(   !x-9A       'Redimension the file list array <vg|8-,#m       Erase in_flist V:D?i#%,z   Xhyc2DKa_       'Tracks how many files are found h _c11#       Dim fCount As Long :q1j?0{2N       fCount = 0 G^P9_Sw]d3   Ki:98a$       'Recurse directory and search for text files 0n{+_        Dim f As String z5^Se!`5       f = Dir$(in_dir & "*.txt") R=NK3iGTf       While f <> "" o9D#d\G           ReDim Preserve in_flist(fCount) l Hu8ADva           in_flist(fCount) = f B&3@b           fCount += 1 .Pe^u%J6F           f = Dir$() 'Um\m       Wend 4GJx1O0Ol       ReDim Preserve in_flist(fCount-1)