RPC Photonics扩散片BSDF

Wl/oun~o   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

7IB<0   摘要： 'c*Q/C;   {Iy<iV   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。 LuM:dJ   RSC^R}a5   背景： }><VcouJ[   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。 P$ZIKkf   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 `w` f[dU-    $A]2Iw!&   VNBf2Va   D1rXTI$$   步骤 `U?" {;j {   IL;JdIa   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。 l2vIKc   图2. RPC Photonics工程漫射体不同类型的散射数据 Tw*:Vw   YRa{6*M   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） Q>Voa&tYn   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 F7P?*!dx   例如下所示： e&sZ]{uD   Sample name:  EDF-C1-56 'APtY;x^{   Merging data from file EDF-C1-56 0-0.txt "HX,RJ @^K   Finished merging RPC data for sample EDF-C1-56 E w#UlA:"v   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ySAkj-< /P   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 }%Mj`Bh   a. 创建一个新的散射库 tIn dve   b. 散射模型命名  kDbDG,O   c. 改变散射模型为“Tabulated BSDF”. 9'nM$a   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 ） 5x856RQ'   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。 HY -7{irR~   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， B_R J;.oH   g. 点击OK 9Rl-Jz8g   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 [rk*4b^s   {9?++G"\   g~EN3~   脚本代码： cjK\(b3   r9MS,KG8   '#Language "WWB-COM" DwSB(O#X    dpG l   Option Explicit &!i'Q;q   1g_p`(   Sub Main vd<r}3i*   pRR1k?       'Cleanup Qp>'V<%m-       ClearOutputWindow() <14,xYpE   %!DdjC&5*       Print "Merging RPC Photonics BSDF Data Files" ~-2%^ovB       SetTextColor(255,0,0) -c%#Hd       Print "Note: Script should be located in the same folder as the BSDF TXT files." a(.q=W       Print "Note: Do not run this script multiple times without deleting the output file between executions." 0\tV@ 6p2=       SetTextColor(0,0,0) mq#8[D   RJ}%pA4I       'Current directory of this script (should be the same as the text files being merged) xXb7/.*qE       Dim cDir As String WO;2=[ #O;       cDir = MacroDir$ & "\" ^.3(o{g   WAq)1gwN       'Array which will be populated with the list of files to be merged Nm{|       Dim fList() As String, curFile As String iA.:{^_)09       GetFileList( cDir, fList ) OVq(ulwi+   ZG(.Q:1       Print "" e^!>W %.7Z       Print "Files found for merging:" D[jPz0       For Each curFile In fList ,:[\h\5m           Print Chr(9) & curFile UP<B>Y1a       Next Rtywi}VV2   r4MPs-}oF       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. DP@F-Q4       Dim nameArray() As String, sampName As String r+%$0eB1^       nameArray = Split(fList(0)," 0-0.txt") y@XE! L       sampName  = nameArray(0) gh9Gc1tKt       Print "" k2-+3zx       Print "Sample name: " & Chr(9) & sampName 3A&: c/   F)8M9%g5m       'Open an output file and write the FRED header data N1D{ %       Dim outFile As String m>FP&~2       outFile = cDir & sampName & "_FRED.txt" iQd,xr       Open outFile For Output As #1 F ?N+ __o       Print #1, "type bsdf_data" kR0 /jEz C       Print #1, "format angles=deg bsdf=value scale=1" =|+%^)E   Wf!u?nH.5       'Loop the file list, skip the two header lines and write the remaining data to file S7B\mv       Dim lineArray() As String, curLine As Long $G<!+^T       For Each curFile In fList `8 Ann~Z|k           Print "Merging data from file " & curFile Ll$,"}0T           ReadFile( cDir & curFile, lineArray ) YMG~k3Yb           For curLine = 2 To UBound(lineArray) e6`g[Ap               Print #1, lineArray(curLine) MSqW {           Next E!EENg       Next dDrzO*a\   61SbBJ6[       'Close the output file Hb&C;lk       Close #1 :pJKZ2B,   A)9F_;BY       Print "Finished merging RPC data for sample " & sampName ]mR!-Fqj       Print "FRED formatted data file: " & Chr(9) & outFile 0n/+X[%Ti   End Sub 1xTNrLW   gmUX 2x(   'Utility function to read the contents of a file into an array of strings. cj;k{Moc   Function ReadFile(ByVal fileName As String, _ ()MUyW"S#`                     ByRef lineArray() As String) As Long 0/5{v6_rG   *";O_ :C!       ReadFile = -1 d-{1>\-_       Dim oFSO As Object GMKY1{        Set oFSO = CreateObject("Scripting.FileSystemObject") U[O7}Nsb"       Erase lineArray C2;Hugm4   wh2Ljskda8       Dim fid As Long _{2/QP}       If oFSO.fileexists( fileName ) Then &gdhq~4#           fid = FreeFile() 4+B&/}FDLo           Open fileName For Input As fid { Ba_.]x           lineArray = Split(Input(LOF(fid), fid), vbCrLf) RI2/hrW           Close fid O77^.B       End If 1|WrJ-Uf       Set oFSO = Nothing !g[UFw       Return UBound( lineArray ) TCI)L}L|   =m-nvXD   End Function +JejnG0   BHf7\+Ul   Sub GetFileList( ByVal in_dir As String, _ ^wlo;.8Y                    ByRef in_flist() As String ) jaL#   *"d['V3       'Redimension the file list array _ SJFuv/       Erase in_flist 0bfJD'^9RP   %~I%*=o[       'Tracks how many files are found KY+BXGW*       Dim fCount As Long \C kb:       fCount = 0 G%MdZg&i   Utj4f-M       'Recurse directory and search for text files 19;Pjo8       Dim f As String 6KE?@3;Om       f = Dir$(in_dir & "*.txt") ! BDJU       While f <> "" =X3Rk)2r           ReDim Preserve in_flist(fCount) ~o27~R ]           in_flist(fCount) = f B-oQj r-           fCount += 1 o(stXa           f = Dir$() :yFmCLZaQ       Wend D+xPd<       ReDim Preserve in_flist(fCount-1)