RPC Photonics扩散片BSDF

c eH8   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

P''5A6#5   摘要： %}< e;t-O   PwF 1Pr`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。 CcF$?07 i   xZmO^F5KHj   背景： n-HQk7=mQ   Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 e_eNtVq   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 &ZkY9XO   Yd}Jz   {VBn@^'s   N)F&c!anh   步骤 1|]IWX|   ,tt .oF|   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 {2|[7oNT6   图2. RPC Photonics工程漫射体不同类型的散射数据 [73 \jT   <K^{36h   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） uc0 1{t0,   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 HR.^ y$IE   例如下所示： Z%h _g-C   Sample name:  EDF-C1-56 MCPVql`+`q   Merging data from file EDF-C1-56 0-0.txt |rjHH<   Finished merging RPC data for sample EDF-C1-56 -4rXOmiA   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt +XaRwcLC.   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 P}YtT3.K   a. 创建一个新的散射库 Y]zy=8q   b. 散射模型命名 (8Q0?SZN   c. 改变散射模型为“Tabulated BSDF”. :htz]   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 ） wiwAdYEQ\   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。 @W4tnM,#   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， ]lT8Z-h@   g. 点击OK we4k VAn   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 gD13(G98   2)iwAu    fGeDygV^`   脚本代码： Y/%(4q*'   qocN:Of1   '#Language "WWB-COM" q <, b   (D\7EH\9,]   Option Explicit >MTrq%.   a#huK~$~   Sub Main QR ?JN\%?   fbTq?4&Q       'Cleanup m;_gNh8Ee       ClearOutputWindow() @r.w+E=   Rm&^[mv       Print "Merging RPC Photonics BSDF Data Files" Fjs:rZ#{       SetTextColor(255,0,0) Q)/V>QW       Print "Note: Script should be located in the same folder as the BSDF TXT files." m1 tYDZ" i       Print "Note: Do not run this script multiple times without deleting the output file between executions." %9q]       SetTextColor(0,0,0) Io(*_3V)B   6UAn#d9       'Current directory of this script (should be the same as the text files being merged) gwA+%]       Dim cDir As String EJCf[#Sf       cDir = MacroDir$ & "\" 3jI rB%   "jUM}@q5       'Array which will be populated with the list of files to be merged yb- 1zF|       Dim fList() As String, curFile As String Jw4#u5$$Z       GetFileList( cDir, fList ) wV604eO(   X7bS{GT       Print "" & t.G4       Print "Files found for merging:" rN3qT p       For Each curFile In fList ,+d\@:           Print Chr(9) & curFile )Ja&Y       Next 9a6ij*#   PM?F;mj       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. n@JZ2K4       Dim nameArray() As String, sampName As String *=2sXH1j       nameArray = Split(fList(0)," 0-0.txt") f?qp*       sampName  = nameArray(0) Irc(5rD7       Print "" +W%3VV$       Print "Sample name: " & Chr(9) & sampName b2tUJ2p   #Q]^9/;|4n       'Open an output file and write the FRED header data G%HuB5:u       Dim outFile As String x+;a2yE~       outFile = cDir & sampName & "_FRED.txt" 7'g{:dzS*3       Open outFile For Output As #1 61@;3yV       Print #1, "type bsdf_data" sQXj?5!       Print #1, "format angles=deg bsdf=value scale=1" rRQKW_9mB   zR!p-7_w       'Loop the file list, skip the two header lines and write the remaining data to file A<U9$"j9J       Dim lineArray() As String, curLine As Long \C}_l+nY       For Each curFile In fList lVYrP|#           Print "Merging data from file " & curFile 8#{DBWU           ReadFile( cDir & curFile, lineArray ) *}P=7TuS           For curLine = 2 To UBound(lineArray) S]x\Asj;w               Print #1, lineArray(curLine) ls@j8bVv^           Next JQ%D6b       Next V{{Xz:   &cSZ?0R       'Close the output file 6ec#3~ Y]       Close #1 9 S4bg7   ccY! OSae       Print "Finished merging RPC data for sample " & sampName 1=Z, #r       Print "FRED formatted data file: " & Chr(9) & outFile NVX@1}   End Sub >X_5o^s2s   <}Hs@`jS   'Utility function to read the contents of a file into an array of strings. 0}3Xry,{   Function ReadFile(ByVal fileName As String, _ KK';ho,W                     ByRef lineArray() As String) As Long '/'dg5bfV   $.F.xYS9IJ       ReadFile = -1 asZ(Hz%       Dim oFSO As Object P^57a?[`       Set oFSO = CreateObject("Scripting.FileSystemObject") d` X1cG       Erase lineArray ?0x=ascP   w(oi6kg       Dim fid As Long z=6zc-$y 9       If oFSO.fileexists( fileName ) Then l{mC|8X           fid = FreeFile() ( u^`3=%n           Open fileName For Input As fid  ae>B0#=           lineArray = Split(Input(LOF(fid), fid), vbCrLf) WyU\,"           Close fid =mYw O=:D       End If UBWUq       Set oFSO = Nothing z'9U.v'M)       Return UBound( lineArray ) 2_GbK-   Q#5~"C   End Function s# V>+mU   *TgD{>s   Sub GetFileList( ByVal in_dir As String, _ }0}=-g&                    ByRef in_flist() As String ) Dnp><%   a7}O.NDf       'Redimension the file list array mu{\_JX.A       Erase in_flist hf\/2Vl   g`(3r       'Tracks how many files are found uI\6":/u       Dim fCount As Long R.KznJ       fCount = 0 PY MofQaZ   9/JBn       'Recurse directory and search for text files UuCRQNH       Dim f As String lx<!*2 -^       f = Dir$(in_dir & "*.txt") 0{(5J,/BF       While f <> "" z#B(1uI           ReDim Preserve in_flist(fCount) ^#!\VGnL           in_flist(fCount) = f 8`z           fCount += 1 6xLQ           f = Dir$() >BZ,g!N,J}       Wend C@WdPjxj       ReDim Preserve in_flist(fCount-1)