RPC Photonics扩散片BSDF

y2W+Y V*   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

`[H^`   摘要： U>tR:)   2w|5SK_   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。 d4o ^+\   O P/DWf   背景： !h?HfpYv   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。 eV7;#w<]   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 A6(Do]M   N+&uR!:.C   z'l$;9(y   t:wBh'K~R8   步骤 1UP {j`-K|   v[L+PD U   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 HT<p=o'$Z   图2. RPC Photonics工程漫射体不同类型的散射数据 _k:8ib2TQ   77\+V 0cF   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） - 2)k!5X=   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 |5u ~L# P   例如下所示： !*]i3 ,{7v   Sample name:  EDF-C1-56 99yWUC,   Merging data from file EDF-C1-56 0-0.txt 2"&GH1   Finished merging RPC data for sample EDF-C1-56 Yxq!7J   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt s;A7:_z#7   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 z;JV3)E   a. 创建一个新的散射库 Sk{skvd;   b. 散射模型命名 `v-[&   c. 改变散射模型为“Tabulated BSDF”. zPnb_[YF   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 ） qU26i"GHp   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。 4t*%(   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，  L<FXtBJ   g. 点击OK $+j1^   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 "B'c;0@q   ixA.b#!1   Fk=SkSky   脚本代码： Ii E6i43   HV%/baX]   '#Language "WWB-COM" E2DfG^sGV   B:h<iU:'D   Option Explicit UZ<K'H,q   )j;^3LiV3   Sub Main gnJ8tuS   97liSd       'Cleanup Jc":zR@ 5       ClearOutputWindow() @gN"Q\;F   s)Y1%#       Print "Merging RPC Photonics BSDF Data Files" Q6m8N       SetTextColor(255,0,0) :M(uP e=D       Print "Note: Script should be located in the same folder as the BSDF TXT files." ?R]`M_^&u!       Print "Note: Do not run this script multiple times without deleting the output file between executions." G&S2U=KdV%       SetTextColor(0,0,0) Wt/;iq"   ULiRuN0 6       'Current directory of this script (should be the same as the text files being merged) 44KoOY_       Dim cDir As String - lX4;       cDir = MacroDir$ & "\" 4Y(@ KUb   qyM/p.mP       'Array which will be populated with the list of files to be merged 6R45+<.       Dim fList() As String, curFile As String 5x+]uABE       GetFileList( cDir, fList ) h0<PQZJ   I)mB]j       Print "" MtkU]XKGT       Print "Files found for merging:" R;DU68R       For Each curFile In fList =}Tm8b0           Print Chr(9) & curFile ;<Q%d~$xy}       Next 1(DiV#epG   Mj;V.Y       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. \Kf\%Q       Dim nameArray() As String, sampName As String *}\M!u{J       nameArray = Split(fList(0)," 0-0.txt") %u!=<yn'       sampName  = nameArray(0) ET.jjV       Print "" 6x^$W ]R       Print "Sample name: " & Chr(9) & sampName +gd5&   o*Qa*<n       'Open an output file and write the FRED header data gGMfy]]R       Dim outFile As String z>W:+W"o       outFile = cDir & sampName & "_FRED.txt" g-qXS]y7       Open outFile For Output As #1 *73gp       Print #1, "type bsdf_data" -leX|U}k       Print #1, "format angles=deg bsdf=value scale=1" c|/HX%Y   ;TL.QN/l       'Loop the file list, skip the two header lines and write the remaining data to file )R7Sh51P       Dim lineArray() As String, curLine As Long BAQ-1kSz       For Each curFile In fList 3y)\dln           Print "Merging data from file " & curFile .I:rb~&           ReadFile( cDir & curFile, lineArray ) %mC@}           For curLine = 2 To UBound(lineArray) k|-\[Yl.               Print #1, lineArray(curLine) #Ha:O,|           Next 7I;kh`H$(f       Next 8n3]AOc'~-   &Ym):pc       'Close the output file mGE!,!s}       Close #1 x)C}   yz68g?"       Print "Finished merging RPC data for sample " & sampName kGD_w       Print "FRED formatted data file: " & Chr(9) & outFile {JfQQP&FV   End Sub [oh06_rB   AA5G`LiT   'Utility function to read the contents of a file into an array of strings. yV.p=8:   Function ReadFile(ByVal fileName As String, _ h~>1-T8                     ByRef lineArray() As String) As Long MtJ-pa~n   P}4&J ^       ReadFile = -1 EL~$7 J       Dim oFSO As Object }r,M(Zr       Set oFSO = CreateObject("Scripting.FileSystemObject") l\Ozy       Erase lineArray ( e Kgc   X9| Z?jJ       Dim fid As Long rMwa6ZO'm;       If oFSO.fileexists( fileName ) Then ]q"&V\b           fid = FreeFile() [-\Y?3           Open fileName For Input As fid 4o#]hB';ni           lineArray = Split(Input(LOF(fid), fid), vbCrLf) k3bQ32()           Close fid WX4sTxJK       End If k'iiRRM       Set oFSO = Nothing #}#m\=0       Return UBound( lineArray ) b/_Zw^DPC   ExG(*[l   End Function JwMRquQv   9\"\7S/Z   Sub GetFileList( ByVal in_dir As String, _ GDLi?3q                    ByRef in_flist() As String ) O=A R`r#u   <%^/uS       'Redimension the file list array U =J5lo       Erase in_flist ZuGSRGX'   P3Ql[2       'Tracks how many files are found G`l\R:Q       Dim fCount As Long _s;y0$O       fCount = 0 Rs=Fcvl   1>e30Ri,g       'Recurse directory and search for text files e=9/3?El       Dim f As String =%|`gZ       f = Dir$(in_dir & "*.txt") i~Tt\UA>       While f <> "" OH@"]Nc~           ReDim Preserve in_flist(fCount) ?d%)R*3IX           in_flist(fCount) = f &6\&Mcm kX           fCount += 1 Lc~m`=B           f = Dir$() W|2^yO,dX       Wend *fm?"0M5       ReDim Preserve in_flist(fCount-1)