RPC Photonics扩散片BSDF

% ab)Gs   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

[iy;}5XK   摘要： G11.6]?Gg   r;8z"*   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。 F>(#Af9   ?QT"sj64w   背景： #(g+jb0E   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。 bMOM`At>z   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 pt ni'W3   A= ]F_   H<7DcwXv   8'WMsp X   步骤 Mr,y|    MYSc*G   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。 _D,f4.R   图2. RPC Photonics工程漫射体不同类型的散射数据 &dDI*v+   7P^ {*!   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） (,c?}TP   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 q}v04Yy,o   例如下所示： ww t()   Sample name:  EDF-C1-56 U3+_'"   Merging data from file EDF-C1-56 0-0.txt pQ^,.[[   Finished merging RPC data for sample EDF-C1-56 wW! r}I#   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt & W<>^C2v   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 jl-Aos"/   a. 创建一个新的散射库 L[Yp\[#-q   b. 散射模型命名 p6y0W`U   c. 改变散射模型为“Tabulated BSDF”. mQ60@_"Y=,   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 ） oT (:33$   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。 v&b.Q:h*'   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， }-q`&1!t   g. 点击OK $< K)fbG   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 _Z66[T+M   !:O/|.+Vmf   UQ.D!q   脚本代码： m9<%v0r   }8F$& AFt   '#Language "WWB-COM" @f5@0A\0   DkF2R @   Option Explicit KWhM   {.3   Sub Main =Q8H]F   jo;uRl       'Cleanup %][$y7       ClearOutputWindow() U|Z>SE<k   Ce5w0&VlS       Print "Merging RPC Photonics BSDF Data Files" /q"d`!h)w       SetTextColor(255,0,0) NBqV0>vR       Print "Note: Script should be located in the same folder as the BSDF TXT files." $]H=       Print "Note: Do not run this script multiple times without deleting the output file between executions." `f6)Q`n       SetTextColor(0,0,0) *)`kx   [71#@^ye       'Current directory of this script (should be the same as the text files being merged) kBiBXRt       Dim cDir As String FSU%?PxO       cDir = MacroDir$ & "\" ) }Rfa}MD   +r-dr>&H@       'Array which will be populated with the list of files to be merged o!=lBfI       Dim fList() As String, curFile As String U%^eIXV|       GetFileList( cDir, fList ) b%[nB   fZ6 fV=HEF       Print "" 5Q$r@&qp       Print "Files found for merging:" $\,BpZ }3       For Each curFile In fList &vFqe,Z           Print Chr(9) & curFile q M_/       Next 'Uko^R)(   Zc%foK {       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ,5\2C{       Dim nameArray() As String, sampName As String t8DL9RW'       nameArray = Split(fList(0)," 0-0.txt") oEQ{m5O9       sampName  = nameArray(0) wTlK4R#       Print "" 9QH 9gdiw       Print "Sample name: " & Chr(9) & sampName gv#c~cX]   q[)q|R|       'Open an output file and write the FRED header data |k`f/*       Dim outFile As String ws>WA{]gq       outFile = cDir & sampName & "_FRED.txt" b.R!2]T]i^       Open outFile For Output As #1 *^@#X-NG       Print #1, "type bsdf_data" <Qcex3       Print #1, "format angles=deg bsdf=value scale=1" RGl=7^M   Y^f94s:2S       'Loop the file list, skip the two header lines and write the remaining data to file ePq13!FC/       Dim lineArray() As String, curLine As Long QE45!Zg       For Each curFile In fList 7b&JX'`Mb           Print "Merging data from file " & curFile /ojO>Y[<            ReadFile( cDir & curFile, lineArray ) =% q?Cr           For curLine = 2 To UBound(lineArray) j{{~ZM               Print #1, lineArray(curLine) h"%|\o+3           Next VqK%^       Next Fl_dzh,E   k_D4'(V:b       'Close the output file \~@[QGKN       Close #1 }W:*aU   .KLm39j(       Print "Finished merging RPC data for sample " & sampName [=F>#8=       Print "FRED formatted data file: " & Chr(9) & outFile lAdDu   End Sub bA@ /B'   Iv$:`7|crX   'Utility function to read the contents of a file into an array of strings. 8K\'Z   Function ReadFile(ByVal fileName As String, _ < /;Q8; 0                     ByRef lineArray() As String) As Long f^W[;w   J [ YtA       ReadFile = -1 Gb(C#,xbK       Dim oFSO As Object .FIt.XPzv       Set oFSO = CreateObject("Scripting.FileSystemObject") 1t/dxB;       Erase lineArray :/C ? FHs9   Sa3I?+       Dim fid As Long aO8 ch       If oFSO.fileexists( fileName ) Then <y@,3DD3A9           fid = FreeFile() j5L)N           Open fileName For Input As fid N\9}\Rk@           lineArray = Split(Input(LOF(fid), fid), vbCrLf) q} ]'Q -           Close fid <eB<^ &nd       End If 3@^MvoC       Set oFSO = Nothing ;i<$7MR.e       Return UBound( lineArray ) uYFMv=>j   A<4_DVd@@   End Function *#3*;dya]   C=fsJ=a5;   Sub GetFileList( ByVal in_dir As String, _ 9YP*f                    ByRef in_flist() As String ) s%eyW _   iM:yX=>a       'Redimension the file list array CzYGq       Erase in_flist P DRnW   sK+ (v       'Tracks how many files are found 81~Kpx       Dim fCount As Long b,nn&B5@{       fCount = 0 NF6X- ,cd   41u*w2j       'Recurse directory and search for text files lB1#       Dim f As String >; aCf#q       f = Dir$(in_dir & "*.txt") `/z_rqJ0CL       While f <> "" o4$Ott%Wm           ReDim Preserve in_flist(fCount) \[:PykS           in_flist(fCount) = f c\At0.QCA           fCount += 1 l0I}&,+           f = Dir$() @.'z* |z       Wend BR+nL6sU       ReDim Preserve in_flist(fCount-1)