RPC Photonics扩散片BSDF

w-2]69$k   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

(_T&2%   摘要： V)`?J)   s|%</fMt9   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。 2'_sGAH   bchhokH    背景： ,rd+ dN   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。 1/m/Iw@   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 h^s}8y   5v3B8 @CsA   efhwbn   ,]d}pJ}PX`   步骤 mF1oY[xa_   LF0~H}S;6B   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。 K(p1+GHC   图2. RPC Photonics工程漫射体不同类型的散射数据 ,[~EThcq   q8 oEb   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） ~i \69q%   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 5Z:HCp-aG   例如下所示： oGM.{\i   Sample name:  EDF-C1-56 5E@V@kw   Merging data from file EDF-C1-56 0-0.txt ofSOy1   Finished merging RPC data for sample EDF-C1-56 >Cf`F{X'U   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt \|(;q+n?k   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 +k>v^sz   a. 创建一个新的散射库 =4I361oMf   b. 散射模型命名 \!PC:+uJ   c. 改变散射模型为“Tabulated BSDF”. NOx| #   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 ） D>mLSh   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|((r?{   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.%E=^~q   g. 点击OK 2 /~v   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 1$|z%(   uODsXi{z   t@Jo ?0s   脚本代码： kO.rgW82   d+^;kse   '#Language "WWB-COM" %:y-"m1\u$   eAqQ~)8^   Option Explicit i{8=;   &F:7U!   Sub Main Rl(b tr1w   rYLNV!_       'Cleanup J+TYm%A;-       ClearOutputWindow() HGKm?'['   -or9!:8       Print "Merging RPC Photonics BSDF Data Files" 1a'JNe$       SetTextColor(255,0,0) @ @5u{K       Print "Note: Script should be located in the same folder as the BSDF TXT files." ?>&8,p17       Print "Note: Do not run this script multiple times without deleting the output file between executions." 4?&=H *H:       SetTextColor(0,0,0) vhg4E80Kr   lA1R$       'Current directory of this script (should be the same as the text files being merged) cmI8Xf]"P-       Dim cDir As String JWBWa-       cDir = MacroDir$ & "\" j]P|iL   o ).pF">jh       'Array which will be populated with the list of files to be merged R0|X;3       Dim fList() As String, curFile As String zL|^5p`K       GetFileList( cDir, fList ) t _W |`   2c~^|@       Print "" ZN?(lt)u9       Print "Files found for merging:" LU]~d<i99       For Each curFile In fList 936t6K&           Print Chr(9) & curFile qg|+BIiUz       Next C]`Y PM5   8 jT"HZB6       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. &sRyM'XI       Dim nameArray() As String, sampName As String v6rw.       nameArray = Split(fList(0)," 0-0.txt") s.~SV"       sampName  = nameArray(0) {tMD*?C[6       Print "" C{Zv. +F       Print "Sample name: " & Chr(9) & sampName 3aOFpCs|#   5x: XXj"       'Open an output file and write the FRED header data *Dn{MD7,M       Dim outFile As String zqeU>V~<F       outFile = cDir & sampName & "_FRED.txt" {kzM*!g       Open outFile For Output As #1 h~1QmEat       Print #1, "type bsdf_data" {Xp.}c       Print #1, "format angles=deg bsdf=value scale=1" lN&GfPP6   ^?A+`1-       'Loop the file list, skip the two header lines and write the remaining data to file 94R+S-|P       Dim lineArray() As String, curLine As Long l>]M^=,&7       For Each curFile In fList J0oR]eT}           Print "Merging data from file " & curFile [ M'1aBx^           ReadFile( cDir & curFile, lineArray ) N.<hZ\].=           For curLine = 2 To UBound(lineArray) #=tWCxf=               Print #1, lineArray(curLine) r  {8           Next Xnh1pwDhe<       Next  pr?/rXw   f6#H@ X       'Close the output file `=*svrmS       Close #1 gu/Yc`S[   J0K"WmW       Print "Finished merging RPC data for sample " & sampName v+OVZDf       Print "FRED formatted data file: " & Chr(9) & outFile v!uLd.(   End Sub 9f@) EKBK   <uvshZv   'Utility function to read the contents of a file into an array of strings. Q4x71*vy   Function ReadFile(ByVal fileName As String, _ |(V3                     ByRef lineArray() As String) As Long .jKO 6f   BO_^3Me*       ReadFile = -1 d?K8Ygz       Dim oFSO As Object IlrmXSr       Set oFSO = CreateObject("Scripting.FileSystemObject") 9p.>L8       Erase lineArray OTm`i>rB   n*1UNQp@]O       Dim fid As Long S]N4o'K}q       If oFSO.fileexists( fileName ) Then 71%u|k8|           fid = FreeFile() /[s$A?           Open fileName For Input As fid 87Kx7CKF"           lineArray = Split(Input(LOF(fid), fid), vbCrLf) '3Ri/V,           Close fid jt3SA [cy       End If Nm~#$orI|       Set oFSO = Nothing Ixw,$%-]y6       Return UBound( lineArray ) *v9G#[gG   . ~<+   End Function _=MWt_A '3   ,aJrN!fzU   Sub GetFileList( ByVal in_dir As String, _ DH^^$)                    ByRef in_flist() As String ) e#('`vGB   v^tKT&       'Redimension the file list array | `nVr>QF&       Erase in_flist 9 2EMDKJ   R<=t{vTJ5       'Tracks how many files are found [wR8q,2       Dim fCount As Long eBB D9SI       fCount = 0 ($s{em4L   2Kidbf       'Recurse directory and search for text files *pMA V[^       Dim f As String NEk [0       f = Dir$(in_dir & "*.txt") 3Z0\I\E       While f <> "" lg1D>=(mY           ReDim Preserve in_flist(fCount) | QA8"&r           in_flist(fCount) = f J[ l K           fCount += 1 J$;)TI           f = Dir$() 7h2bL6Y88       Wend ^Ram8fW       ReDim Preserve in_flist(fCount-1)