RPC Photonics扩散片BSDF

~P}ng{x4z   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

  rwSR   摘要： /<T{g0s   Fg p|gw4   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。 ImB5F'HI$   MX#LtCG#V   背景： 5,4"  CF$   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。 S3HyB b   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 e@O]c"   eW<NDI&b   Zp{K_ec{   &$T7eOiZ   步骤 8H};p u2   I+Yq",{%   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 !}x-o`a5   图2. RPC Photonics工程漫射体不同类型的散射数据 Y<Ae_yLa   ?vWF[ DRd'   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） %b_0l<+   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 2H8\P+   例如下所示： 4yTgH0(T   Sample name:  EDF-C1-56 Ed0}$b   Merging data from file EDF-C1-56 0-0.txt 8.wtv5eZ   Finished merging RPC data for sample EDF-C1-56 mg._c   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ,V5fvHPH)8   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 t}}Ti$$>   a. 创建一个新的散射库 <M5fk?n,|   b. 散射模型命名 a)S6Z   c. 改变散射模型为“Tabulated BSDF”. <i r]bQT   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 ） Xep2)3k>   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。 ql5&&e=-   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， >*B59+1P   g. 点击OK *e:I*L   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 'bH~KK5   Y0Tw:1a   qM3NQ8Rm   脚本代码： A^hafBa   )iC@n8f7o   '#Language "WWB-COM" k=p[Mlic/   V#Y"0l+~   Option Explicit * _usVg   gE*7[*2?t   Sub Main u^'X>n)oL#   h{\S'8       'Cleanup yZoJD{'?Sw       ClearOutputWindow() 9zx9t   ;2?fz@KZ       Print "Merging RPC Photonics BSDF Data Files" GKUjtPu       SetTextColor(255,0,0) P%R9\iajH       Print "Note: Script should be located in the same folder as the BSDF TXT files." [\fwn S_1       Print "Note: Do not run this script multiple times without deleting the output file between executions." 7# Fcn       SetTextColor(0,0,0) BSr#;;\   e*I92       'Current directory of this script (should be the same as the text files being merged) 'vq0Tw5       Dim cDir As String 23houS       cDir = MacroDir$ & "\" QAl4w)F   mL#$8wUdt{       'Array which will be populated with the list of files to be merged X4'!:&       Dim fList() As String, curFile As String F]N?_ bo       GetFileList( cDir, fList ) i&)([C0z$   ZifDU@J$t       Print "" i3L2N~:V       Print "Files found for merging:"  2zv:j7       For Each curFile In fList JXt_            Print Chr(9) & curFile ^e\$g2) .       Next Ne3YhCC>   )@tHS-Jf       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ?} E M,       Dim nameArray() As String, sampName As String y5^OD63s       nameArray = Split(fList(0)," 0-0.txt") Tgla_sMb       sampName  = nameArray(0) 8NNs_~+x}       Print "" 8aM\B%NGWi       Print "Sample name: " & Chr(9) & sampName Azr|cKu]   rY@9nQ\>g       'Open an output file and write the FRED header data  Pv)^L       Dim outFile As String 5xj8^W^G9       outFile = cDir & sampName & "_FRED.txt" S|6i]/       Open outFile For Output As #1 ~GJ;;v1b2       Print #1, "type bsdf_data" S$40nM       Print #1, "format angles=deg bsdf=value scale=1" (m2_Eh;   v7hw%9(=       'Loop the file list, skip the two header lines and write the remaining data to file LU@1Gol       Dim lineArray() As String, curLine As Long M*Q}^<E*       For Each curFile In fList k#/cdK!K           Print "Merging data from file " & curFile SY@;u<Pd           ReadFile( cDir & curFile, lineArray ) :}#j-ZCC"           For curLine = 2 To UBound(lineArray) Z@*!0~NH=4               Print #1, lineArray(curLine) '|Lv-7           Next U1rr=h g       Next kf|J   F$:UvW@e1       'Close the output file .SSyW {a3w       Close #1 (WY9EJ<s,   'w<^4/L Q       Print "Finished merging RPC data for sample " & sampName N K@6U_/W       Print "FRED formatted data file: " & Chr(9) & outFile t0/Ol'kgs   End Sub 'V <ZmJ2   }!|$;3t+c   'Utility function to read the contents of a file into an array of strings. :v$)Z~   Function ReadFile(ByVal fileName As String, _ */@I$*                     ByRef lineArray() As String) As Long XW^Pz(   t56PzT'M       ReadFile = -1 VP~%,=       Dim oFSO As Object O@dK^o       Set oFSO = CreateObject("Scripting.FileSystemObject") 4+p1`       Erase lineArray -H|! KnR   w?M"`O(       Dim fid As Long _)YB *z5       If oFSO.fileexists( fileName ) Then VpY,@qh           fid = FreeFile() n!Y}D:6c6           Open fileName For Input As fid $ )2zz>4           lineArray = Split(Input(LOF(fid), fid), vbCrLf) `f G<iBD           Close fid gv(MX ;B#       End If ];=|))ky"       Set oFSO = Nothing DFRgn       Return UBound( lineArray ) i3$G)W   Pj BBXI1i   End Function )Q}Q -Zt   J{XRltI+   Sub GetFileList( ByVal in_dir As String, _ T@zp'6\H                    ByRef in_flist() As String ) 8f%O Pcr&   t!B,%,Dp       'Redimension the file list array \.P#QVuQ       Erase in_flist vv5rA 6+   gt~u/Z%       'Tracks how many files are found LFYSur8       Dim fCount As Long  s%5XB I       fCount = 0 $kkL)O*"]   `@u9 fx.       'Recurse directory and search for text files 4V mUTMY       Dim f As String W,!7_nl"u       f = Dir$(in_dir & "*.txt") [`bK {Dq2       While f <> "" I9#l2<DYlX           ReDim Preserve in_flist(fCount) 28-z           in_flist(fCount) = f q$ j           fCount += 1 Tn\{*A           f = Dir$() Z;0<k;#T(p       Wend k!6m'}v       ReDim Preserve in_flist(fCount-1)