RPC Photonics扩散片BSDF

?VOs:sln   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

iaa (ce   摘要： GH; F3s   ]mD=Br*r~   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。  jKb=Zkd   3*2&Fw!B   背景： x%:>Ol   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。 RqX4ep5j   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 )qe$rD;N   6>N u=~   H,4,~lv|   K&Wv.}=V   步骤 6Ymo%OT   qRP8dH   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 zOu$H[   图2. RPC Photonics工程漫射体不同类型的散射数据 M*T# 5   v0jz)z<#   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） o Vuj020   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 (PT?h>|St   例如下所示： ("P mB?20   Sample name:  EDF-C1-56 w_z^5\u0   Merging data from file EDF-C1-56 0-0.txt 'bY|$\I   Finished merging RPC data for sample EDF-C1-56 BorfEv} SN   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt @x-GbK?   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ss*2TE7   a. 创建一个新的散射库 6 peM4X   b. 散射模型命名 4K?H-Jco   c. 改变散射模型为“Tabulated BSDF”. `bt)'ERO%#   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） We+FP9d%   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 )S;Xy`vO   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， k~9Ywf   g. 点击OK <2@<r t{   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 KxTYc   Ci#5@Q9#w   \%4+mgiD   脚本代码： YT 03>!B   fPk9(X;G!p   '#Language "WWB-COM" @Qsg.9N3K   ofrlTw&o   Option Explicit ,LPFb6o   v8fZ?dx   Sub Main u%IKM\   0R^(rE"2#       'Cleanup PA-0FlV|       ClearOutputWindow() m{yNnJ3O   X9`C2fyVd       Print "Merging RPC Photonics BSDF Data Files" :~A1Ud4c       SetTextColor(255,0,0) [@FeRIu8       Print "Note: Script should be located in the same folder as the BSDF TXT files." WO*WAP)n       Print "Note: Do not run this script multiple times without deleting the output file between executions." N n-6/]d#       SetTextColor(0,0,0) Ew,wNR`   >dC(~j{       'Current directory of this script (should be the same as the text files being merged) xY}j8~k       Dim cDir As String <n~g+ps       cDir = MacroDir$ & "\" 2'^OtM,   BRok 89       'Array which will be populated with the list of files to be merged #1!BD!u       Dim fList() As String, curFile As String ,HO/Q6;N       GetFileList( cDir, fList ) E#V-F-@2   ^l2d?v8       Print "" Qs[EA_       Print "Files found for merging:" N{z(|2{A#       For Each curFile In fList ,'{B+CHoS           Print Chr(9) & curFile _j <M}       Next -Aym+N9   J1ro \"       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. V^5k>`A       Dim nameArray() As String, sampName As String 6o23#JgN       nameArray = Split(fList(0)," 0-0.txt") KZ/^gR\d       sampName  = nameArray(0) "7g8 d       Print "" tZBE& :l       Print "Sample name: " & Chr(9) & sampName Glc4g   aTL7"Myp       'Open an output file and write the FRED header data <^ c0bY1       Dim outFile As String 9v3N ba       outFile = cDir & sampName & "_FRED.txt" MJR\ g3       Open outFile For Output As #1 R/FV'qy]       Print #1, "type bsdf_data" >;U%~yy}qc       Print #1, "format angles=deg bsdf=value scale=1" ,^[37 /S   /%'7sx[p       'Loop the file list, skip the two header lines and write the remaining data to file K>JU/(       Dim lineArray() As String, curLine As Long ,ui'^8{gK       For Each curFile In fList ?-v?SN#           Print "Merging data from file " & curFile ?B:wV?-`           ReadFile( cDir & curFile, lineArray ) krY.Cc]           For curLine = 2 To UBound(lineArray) \J g#X:d               Print #1, lineArray(curLine) 7n/I'r           Next 5{f/H] P       Next Y$5v3E\uc   b N%MT#X       'Close the output file SL5DWZ       Close #1 m64\@ [   0~5}F^8[L       Print "Finished merging RPC data for sample " & sampName X \ZUt >       Print "FRED formatted data file: " & Chr(9) & outFile nE$ V<Co}   End Sub I{U B!0H   I,Y^_(JW   'Utility function to read the contents of a file into an array of strings. QN5N hs   Function ReadFile(ByVal fileName As String, _ RwHXn] 1                     ByRef lineArray() As String) As Long BrmFwXLP"   ?^GsR[-x       ReadFile = -1 X E%6c3s       Dim oFSO As Object A^7Zy79       Set oFSO = CreateObject("Scripting.FileSystemObject") ?Og;W9i       Erase lineArray iEO2Bil]   bvvx(?!       Dim fid As Long *3oQS"8       If oFSO.fileexists( fileName ) Then wpMQ 7:j           fid = FreeFile() DuZ]g#           Open fileName For Input As fid E*"E{E7           lineArray = Split(Input(LOF(fid), fid), vbCrLf) I=I%e3GEm           Close fid mw.aavB       End If }eK* )       Set oFSO = Nothing !.N=Y;@lY       Return UBound( lineArray ) ;8kfgpM_   ~u1JR`y   End Function FJ. :*K[   3{E}^ve   Sub GetFileList( ByVal in_dir As String, _ -<.NEV                    ByRef in_flist() As String ) ur5n{0#   (Gsg+c        'Redimension the file list array ,urkd~       Erase in_flist N=x,96CF   K",]_+b       'Tracks how many files are found j* ja)       Dim fCount As Long ai2}vR       fCount = 0 (acRYv(   M" \y2        'Recurse directory and search for text files %"B$I>h       Dim f As String co-D,o4x       f = Dir$(in_dir & "*.txt")  .l'QCW9       While f <> "" y5 +&P           ReDim Preserve in_flist(fCount) Jrl xa3 [           in_flist(fCount) = f k{8N@&D           fCount += 1 v:b%G?o           f = Dir$() `;hBO#(H0}       Wend w|#79,&       ReDim Preserve in_flist(fCount-1)