RPC Photonics扩散片BSDF

J.2BB y   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

oKSW:A   摘要： }1CO>a<   Qh3+4nLFtb   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。 (1{OQ0N+x   "OUY^ cM   背景： Vx0Hq`_1 4   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。 3H"F~_H   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 -=rGN"(M _   @AG=Eq9<o   m|cR j{xZF   2 (ux   步骤 v/KTEM   ]6=opvm   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。 <0`"vPU   图2. RPC Photonics工程漫射体不同类型的散射数据 &U.y):   >>J!|   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） /KvpJ4   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 nYRD>S?uz   例如下所示： =8r,-3lC;   Sample name:  EDF-C1-56 f}FJR6VO   Merging data from file EDF-C1-56 0-0.txt 9D%~~~ %b   Finished merging RPC data for sample EDF-C1-56 mOjl0n[To]   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt H<b4B$/   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 kr1^`>O5   a. 创建一个新的散射库 1^;&?E   b. 散射模型命名 t^ 9q>[/d`   c. 改变散射模型为“Tabulated BSDF”. !q PUQ+   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） 8>:2li   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 8J9o$Se   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， D3 E!jQ1   g. 点击OK eP3 itrH(   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 e''Wm.>g(+   naB[0I& N   X_|} b[b   脚本代码： WUi7~Ei}   ]gj@r[   '#Language "WWB-COM" r?2C%GI`   2I 39fZa   Option Explicit X]CaWxM   qm}7w3I^   Sub Main 5O%}.}n   ~yf5$~Z       'Cleanup }mJ)gK5b 6       ClearOutputWindow() AB#hhi#   7,LT4wYH       Print "Merging RPC Photonics BSDF Data Files" 8@Km@o]?       SetTextColor(255,0,0) X!_OOfueP8       Print "Note: Script should be located in the same folder as the BSDF TXT files." #wm)e)2@       Print "Note: Do not run this script multiple times without deleting the output file between executions." &q` =xF       SetTextColor(0,0,0) %BHq2~J   /3Gv51'       'Current directory of this script (should be the same as the text files being merged) IweQB}d       Dim cDir As String qC|re!K       cDir = MacroDir$ & "\" IX3U \_I#   Yc5$915       'Array which will be populated with the list of files to be merged AU$5"kBE       Dim fList() As String, curFile As String J<zg 'Jk^       GetFileList( cDir, fList ) a+BA~|u^   9hp0wi@W}       Print "" ZyWC_r!       Print "Files found for merging:" wYawG$@_       For Each curFile In fList 2Uk8{d           Print Chr(9) & curFile *AN#D?X _       Next 9_/1TjrDN   IH0^*f       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. !c`1~a!       Dim nameArray() As String, sampName As String 5Np.&       nameArray = Split(fList(0)," 0-0.txt") BPOWo8TqD^       sampName  = nameArray(0) [E/3&3       Print "" Tuy*Df       Print "Sample name: " & Chr(9) & sampName Fu><lN7   tr}$82Po       'Open an output file and write the FRED header data V)Xcn'h       Dim outFile As String .lnD]Q       outFile = cDir & sampName & "_FRED.txt" y|mR'{$I       Open outFile For Output As #1 V!=]a^]:       Print #1, "type bsdf_data" C|JWom\J       Print #1, "format angles=deg bsdf=value scale=1" 1|89-Ii]   Zn!SHj       'Loop the file list, skip the two header lines and write the remaining data to file ljCgIfZ_4       Dim lineArray() As String, curLine As Long 0nuFWV       For Each curFile In fList [6tQv<}^           Print "Merging data from file " & curFile Aws TDM           ReadFile( cDir & curFile, lineArray ) O#|E7;           For curLine = 2 To UBound(lineArray) &Gt9a-ne               Print #1, lineArray(curLine) ;g*6NzdA           Next }?^G=IP4(       Next 0.5_,an3   ~!OjdE!u       'Close the output file -|kDa1knA       Close #1 !1_:nD   G#*;3X$       Print "Finished merging RPC data for sample " & sampName ;vx9xs?6       Print "FRED formatted data file: " & Chr(9) & outFile _Owz%   End Sub J5"*OH:f   xVPGl U   'Utility function to read the contents of a file into an array of strings. 1&<@(S<   Function ReadFile(ByVal fileName As String, _ V+q RDQ                     ByRef lineArray() As String) As Long -wt2ydzos   l]Sui_+ZU       ReadFile = -1 hg~fFj3ST       Dim oFSO As Object YGO@X(ej,       Set oFSO = CreateObject("Scripting.FileSystemObject") 90!Ib~7zH       Erase lineArray 7$;$4.'   H6eGLg={       Dim fid As Long H#y"3E<s       If oFSO.fileexists( fileName ) Then #wyS?FP-           fid = FreeFile() @:@rks&           Open fileName For Input As fid '9gI=/29D           lineArray = Split(Input(LOF(fid), fid), vbCrLf) ~83P09\T%           Close fid (r4\dp&       End If SJ-Sac58r       Set oFSO = Nothing ,L;vN6~       Return UBound( lineArray )  df'g},_   %r"GL   End Function aBnbu vp   [1U_c*;i   Sub GetFileList( ByVal in_dir As String, _ A.b#r[                    ByRef in_flist() As String ) _u>>+6,p   :Eyv==       'Redimension the file list array i]z i[Zo$       Erase in_flist /["T#`   >e;f{       'Tracks how many files are found 'Ot[q^,KRG       Dim fCount As Long 8E+l;2       fCount = 0 Tjqn::~D   %K7}yy&9C       'Recurse directory and search for text files h~p}08       Dim f As String JPG!c X%       f = Dir$(in_dir & "*.txt") I\~V0<"jI       While f <> "" =*Xf(mhc           ReDim Preserve in_flist(fCount) D.b<I79bX           in_flist(fCount) = f MV}]i@V           fCount += 1 )|x5#b-lz           f = Dir$() (&,R1dLo       Wend HV.7IyBA^       ReDim Preserve in_flist(fCount-1)