RPC Photonics扩散片BSDF

v wxXgk   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

tg<EY!WY   摘要： U`2e{>'4t   UdpF@Q   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。 T9Nb`sbV]   zdYy^8V|z   背景： `ojoOB^L   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。 ^rifRY-,yO   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 ~Vr.J}]J   6">+ ~ G   KbA?7^zo`   hpO`]   步骤 R}*_~7r5   t.xxSU5~%   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。 h4T5+~rw   图2. RPC Photonics工程漫射体不同类型的散射数据 {y=j?lD   YQj2   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） .y!<t}   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 PoG-Rqe   例如下所示： x|pg"v&[   Sample name:  EDF-C1-56 H9YW   Merging data from file EDF-C1-56 0-0.txt jI C_[   Finished merging RPC data for sample EDF-C1-56 Cv6'`",Yzm   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt fSK]|"c   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 )48QBz?   a. 创建一个新的散射库 ,$s8GAmq   b. 散射模型命名 |}=acc/   c. 改变散射模型为“Tabulated BSDF”. 3G}x;Cp\D   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） CDQW !XHc   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 -p]1=@A<}   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， oX30VfT   g. 点击OK ,!#*GZ.ix   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 2mVD_ s[`   =P't(<   M2OIBH4!   脚本代码： a_f ~N1kq   2^h27A   '#Language "WWB-COM" -GhP9; d   K|zZS%?$   Option Explicit /:~\5}tW   B+\3-q   Sub Main IzikDc10   *>7>g"       'Cleanup GpY"fc%       ClearOutputWindow() 0 D\#Pq v   Dfg2`l       Print "Merging RPC Photonics BSDF Data Files" KL1/^1       SetTextColor(255,0,0) xS4w5i2       Print "Note: Script should be located in the same folder as the BSDF TXT files." v$7QIl_/7       Print "Note: Do not run this script multiple times without deleting the output file between executions." >,gg5<F-E       SetTextColor(0,0,0) nAW:utTB   ?Y-%'J(       'Current directory of this script (should be the same as the text files being merged) {o_X`rgrL       Dim cDir As String x$5) ^ud?       cDir = MacroDir$ & "\" l=S35og   =RA /       'Array which will be populated with the list of files to be merged LClNxm2X       Dim fList() As String, curFile As String \F1_lq;K       GetFileList( cDir, fList ) 0m%|U'm|j   5D\f8L       Print "" i2E)P x       Print "Files found for merging:" Uzz'.K(Mv|       For Each curFile In fList *"?l]d           Print Chr(9) & curFile Jj!v h{       Next s.bc>E0   +T|JK7       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. CR8/Ke       Dim nameArray() As String, sampName As String nKPYOY8^       nameArray = Split(fList(0)," 0-0.txt") 4r>6G/b8*       sampName  = nameArray(0) R.jIl@p        Print "" X 0WJBEE       Print "Sample name: " & Chr(9) & sampName U 9_9l7&r   !\nBh       'Open an output file and write the FRED header data D>/0v8       Dim outFile As String qkt0**\       outFile = cDir & sampName & "_FRED.txt" -G}[AkmS       Open outFile For Output As #1 m+`fn;*       Print #1, "type bsdf_data" u$DHVRrF<       Print #1, "format angles=deg bsdf=value scale=1" zL$@`Eh-KP   ~zHjMo2       'Loop the file list, skip the two header lines and write the remaining data to file F_w Z"e6       Dim lineArray() As String, curLine As Long KK&rb~       For Each curFile In fList aZ2!i           Print "Merging data from file " & curFile q$I;dOCJ,           ReadFile( cDir & curFile, lineArray ) QQ%D8$k"           For curLine = 2 To UBound(lineArray) .>=(' -               Print #1, lineArray(curLine) f!\lg           Next }YB*]<]       Next {@eJtF+2   /qMG=Z       'Close the output file .z]Wyx&/U       Close #1 g[1gF&   S|SV$_ (       Print "Finished merging RPC data for sample " & sampName [$qyF|/K`n       Print "FRED formatted data file: " & Chr(9) & outFile AJh w   End Sub +MR.>"   9!6f-K   'Utility function to read the contents of a file into an array of strings. ^N7e76VwR   Function ReadFile(ByVal fileName As String, _ [b6R%                     ByRef lineArray() As String) As Long &M46&^Jho   M9!HQ        ReadFile = -1  m_ .>C       Dim oFSO As Object .:@Ykdm4I       Set oFSO = CreateObject("Scripting.FileSystemObject") W#^2#sjO       Erase lineArray K~c=M",mW    3L<wQ(       Dim fid As Long 1;C+$       If oFSO.fileexists( fileName ) Then G/b^|;41           fid = FreeFile() ~D<IB#C           Open fileName For Input As fid hlV=qfc           lineArray = Split(Input(LOF(fid), fid), vbCrLf) !Fca~31R'           Close fid 5*+!+V^?X       End If s8ywKTR-       Set oFSO = Nothing -wp|RD,}(       Return UBound( lineArray ) @OV|]u   k_sg ?(-!o   End Function h}*/Ge]aM   &,}j #3<   Sub GetFileList( ByVal in_dir As String, _ G }:w@}h/                    ByRef in_flist() As String ) +1uF !G&l    8cU}I4|       'Redimension the file list array tmv&U;0Z       Erase in_flist ?%O(mC]u&   C9~52+S       'Tracks how many files are found :Pvzl1       Dim fCount As Long \DYWy*p e       fCount = 0 ?j40} B]]d   .LZwuJ^;       'Recurse directory and search for text files ABQa 3{v       Dim f As String GR +[UG       f = Dir$(in_dir & "*.txt") isQ[ Gc!8       While f <> "" TV<'8L           ReDim Preserve in_flist(fCount) |bq$xp           in_flist(fCount) = f 3?c3<`TW           fCount += 1 f({Ei`|           f = Dir$() HW=C),*]cR       Wend Z)! qW?       ReDim Preserve in_flist(fCount-1)