RPC Photonics扩散片BSDF

h!K2F~i{P   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

5{q/z^]   摘要： z,|%? 1   6B/"M-YME   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。 -^H5z+"^   Q)BoWd   背景： _-\s[p5   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。 ;CMC`h9,   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 )6E*Qz   5v i#ItN}|   IKDjatn   | u;BAb   步骤 X&s\_jQ   3c^=<i %   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。 ,?<h] !aQ   图2. RPC Photonics工程漫射体不同类型的散射数据 Zfv(\SI   6Y)^)dOi   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） }8M`2HMFR   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  %]0U60   例如下所示： hS{ *l9v7   Sample name:  EDF-C1-56 0^.4eX:E_   Merging data from file EDF-C1-56 0-0.txt Vfm #UvA   Finished merging RPC data for sample EDF-C1-56 '&:x_WwVrO   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 'Y{ux>   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 yr9A0F0   a. 创建一个新的散射库 (l8r>V   b. 散射模型命名 [RFK-E   c. 改变散射模型为“Tabulated BSDF”. qV8\/7'A0a   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 ） R}X_2""   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。 uAS8F=9xP   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， d)1sP0Z_@   g. 点击OK uU(G_E ?   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 `V):V4!j),   hf^`at   O;BMwg_7   脚本代码： uM)9b*Vbo   0rJ\ e   '#Language "WWB-COM" 199hQxib:   QGv:h[b_   Option Explicit <fsn2[V:B%   AzO3(1:   Sub Main ]7S7CVDk4   >)J47j7{c       'Cleanup xDA,?i;T 0       ClearOutputWindow() hW!@$Ph   2@m(XT (       Print "Merging RPC Photonics BSDF Data Files" }:9|*m<$t       SetTextColor(255,0,0) JNM@Q       Print "Note: Script should be located in the same folder as the BSDF TXT files." =PKt09b ^       Print "Note: Do not run this script multiple times without deleting the output file between executions." 4R*<WdT(       SetTextColor(0,0,0) xK),:+G(   95?5=TF       'Current directory of this script (should be the same as the text files being merged) qe6C|W~n       Dim cDir As String OwiWnS<       cDir = MacroDir$ & "\" `k{ff   gc2|V6(       'Array which will be populated with the list of files to be merged 3w^J"O/T       Dim fList() As String, curFile As String jU4)zN/`r       GetFileList( cDir, fList ) 1|~#028   oY2?W       Print "" K!-&Zv       Print "Files found for merging:" 9u7n/o&8v6       For Each curFile In fList x#F1@r8R           Print Chr(9) & curFile lQ<#jxp       Next mWN1Q<vn,l   i^sDh>$J       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. [Z5}2gB&       Dim nameArray() As String, sampName As String g3|Y$/J7P       nameArray = Split(fList(0)," 0-0.txt") jWv3O&+?X       sampName  = nameArray(0) q0b`HD       Print "" (J^Lqh_       Print "Sample name: " & Chr(9) & sampName C?/r}ly<\   Jp.3KA>       'Open an output file and write the FRED header data w*6!?=jP       Dim outFile As String qtdxMX]iR       outFile = cDir & sampName & "_FRED.txt" ^Z-.[Y       Open outFile For Output As #1 [!:-m61       Print #1, "type bsdf_data" =N*%f%       Print #1, "format angles=deg bsdf=value scale=1" 3D$\y~HU   MgH1d&R       'Loop the file list, skip the two header lines and write the remaining data to file @\6nXf       Dim lineArray() As String, curLine As Long :_fjml/       For Each curFile In fList _ r^90           Print "Merging data from file " & curFile gf3u0' $           ReadFile( cDir & curFile, lineArray ) +9 16ZPk           For curLine = 2 To UBound(lineArray) `u p-m=zA               Print #1, lineArray(curLine) s.p1L           Next _Qm7x>NT4       Next  VNr   B~V<n&<       'Close the output file <@U.        Close #1 {m_A1D/_   r3[t<xlFf       Print "Finished merging RPC data for sample " & sampName Wk\mgGn+       Print "FRED formatted data file: " & Chr(9) & outFile %?]{U($?   End Sub kwDh|K   qEK4I}Q-=   'Utility function to read the contents of a file into an array of strings. $,; ;u:-   Function ReadFile(ByVal fileName As String, _ V5e\%                     ByRef lineArray() As String) As Long Gs_*/E7,   _XY`UZ       ReadFile = -1 r6F{       Dim oFSO As Object Xb(CH#*{z       Set oFSO = CreateObject("Scripting.FileSystemObject") PS_3Oq)       Erase lineArray iioct_7,g<   Qfkh0DX B       Dim fid As Long Tsm)&$JI8       If oFSO.fileexists( fileName ) Then bk\dy7           fid = FreeFile() "t(1tWO1o           Open fileName For Input As fid >G-8FL           lineArray = Split(Input(LOF(fid), fid), vbCrLf) 95.qAFB1           Close fid 7gVh !rm       End If iXUWIgr       Set oFSO = Nothing b"ol\&1 #       Return UBound( lineArray ) vHs>ba$"   ? -v   End Function `DgaO-Dg3   71k!k&Im   Sub GetFileList( ByVal in_dir As String, _ RL7C YB                    ByRef in_flist() As String ) o9KyAP$2   7af?E)}v       'Redimension the file list array rmY,v       Erase in_flist s jL *I   Nk lz_ ]       'Tracks how many files are found wFK:Dp_^       Dim fCount As Long i_|9<7a       fCount = 0 Ez06:]Jd   l 8O"w&       'Recurse directory and search for text files &ui:DZAxj|       Dim f As String Zw;$(="       f = Dir$(in_dir & "*.txt") |Hx%f       While f <> "" Gkdm7SV           ReDim Preserve in_flist(fCount) %/{IssCR7           in_flist(fCount) = f @Ufa-h5"(           fCount += 1 4mEzcwo'           f = Dir$() jo 7Hyw!g       Wend ,|e}Y [       ReDim Preserve in_flist(fCount-1)