RPC Photonics扩散片BSDF

Om;&_! i   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

Jg}K.1Hs   摘要： Uu 8,@W+   (xHf4[[u   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。 0'YG6(h   E_e6^Sk5B(   背景： \R36w^c3   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。 !8NC# s   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 }|u4 W?H   L|P5=/d   #|&Sc_#4)   :L44]K5FL   步骤 fC ,:{}   (0YZZ93   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。 [Zei0O   图2. RPC Photonics工程漫射体不同类型的散射数据 [I!6PGx   -K9c@?   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） tg]x0#@s   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 Bp8'pj;~   例如下所示： if|+EN%   Sample name:  EDF-C1-56 6f')6X'x   Merging data from file EDF-C1-56 0-0.txt [W%$qZlP   Finished merging RPC data for sample EDF-C1-56 P9g en6   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ),G=s Oo   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 W`\R%>$H   a. 创建一个新的散射库 1%4sHSN   b. 散射模型命名 h%}/Cmx[   c. 改变散射模型为“Tabulated BSDF”. 3)\8%Ox   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 ） ]o cWt3|   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。 na9sm   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， h4q|lA6!k8   g. 点击OK O+y-}7YX   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 }VS5gxI1.   Tyvtmx M   /"eey(X   脚本代码： JSW^dw&   G:~k.1y[   '#Language "WWB-COM" =c/wplv*   N[<\>Ps|u   Option Explicit D6>HN [D"   $STaQ28C   Sub Main { ^cV lC_   (p2 K36,9m       'Cleanup `s\?w5[       ClearOutputWindow() 0NS<?p~_S   bbrXgQ`s+w       Print "Merging RPC Photonics BSDF Data Files" 0q&<bV:D       SetTextColor(255,0,0) NR`C(^}       Print "Note: Script should be located in the same folder as the BSDF TXT files." zuUW|r       Print "Note: Do not run this script multiple times without deleting the output file between executions." W[Ls|<Q       SetTextColor(0,0,0) N<~t3/Nm   XUz3*rfs       'Current directory of this script (should be the same as the text files being merged) q@[QjGj@       Dim cDir As String z^'gx@YD*v       cDir = MacroDir$ & "\" Z'"tB/=W   !\7!3$w'8,       'Array which will be populated with the list of files to be merged <StN%2WQ1       Dim fList() As String, curFile As String <1uZa       GetFileList( cDir, fList ) Zl^\Q=*s   Wk)OkIFR       Print "" |S_eDjF       Print "Files found for merging:" DGS$Ukz&T       For Each curFile In fList IZpP[hov           Print Chr(9) & curFile 8fl`r~bqZ       Next n*2UnKaJ   !@}wDt       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. kqFP)!37       Dim nameArray() As String, sampName As String wB.&}p9p       nameArray = Split(fList(0)," 0-0.txt") 9[<)WQe6M       sampName  = nameArray(0) 3kybLOG       Print "" E=nIRG|g       Print "Sample name: " & Chr(9) & sampName bbE!qk;hEP   '@_d(N1jTw       'Open an output file and write the FRED header data 4 o Fel.o       Dim outFile As String g:hjy@ w       outFile = cDir & sampName & "_FRED.txt" |?,A]|j       Open outFile For Output As #1 sB7# ~pA       Print #1, "type bsdf_data" .+$Q<L       Print #1, "format angles=deg bsdf=value scale=1" 8WXQOo8   :tV*7S=)       'Loop the file list, skip the two header lines and write the remaining data to file =l+yA>t|       Dim lineArray() As String, curLine As Long _852H$H\       For Each curFile In fList Z?h~{Mg           Print "Merging data from file " & curFile ItNz}4o|d           ReadFile( cDir & curFile, lineArray ) !|^|,"A)           For curLine = 2 To UBound(lineArray) UtoT               Print #1, lineArray(curLine) B38]~'8           Next %)1y AdG 8       Next h9}+l   8\+uec]k       'Close the output file C5o#i*|       Close #1 'jWr<]3   | )K8N<n       Print "Finished merging RPC data for sample " & sampName ;U/&I3dzV       Print "FRED formatted data file: " & Chr(9) & outFile Z^3rLCa   End Sub >g1~CEMN#   01t1Z}!y   'Utility function to read the contents of a file into an array of strings. +$ 'Zf0U   Function ReadFile(ByVal fileName As String, _ D4eDHq                     ByRef lineArray() As String) As Long oB(?_No7   u^^[Q2LDU}       ReadFile = -1 NcBIg:V\c       Dim oFSO As Object rV` #[d       Set oFSO = CreateObject("Scripting.FileSystemObject") DX#Nf""Pw       Erase lineArray 0CnOL!3.I   p|U?86t       Dim fid As Long +}Dw3;W}m       If oFSO.fileexists( fileName ) Then YvaK0p0Z           fid = FreeFile() 'OITI TM           Open fileName For Input As fid 3dg1DR;           lineArray = Split(Input(LOF(fid), fid), vbCrLf) .s?L^Z^           Close fid _>&X\`D       End If =W(Q34       Set oFSO = Nothing - YEZ]:"       Return UBound( lineArray ) 8V'~UzK   8'HEms   End Function BtkOnbz8X   Ua :}Vn&!   Sub GetFileList( ByVal in_dir As String, _ 5T H~.^`Fi                    ByRef in_flist() As String ) YL!P0o13r   Wf+cDpK       'Redimension the file list array >FeX<L       Erase in_flist 3#LlDC_WC   qU \w=       'Tracks how many files are found y8]B:_iU9       Dim fCount As Long KjD/o?JUr       fCount = 0 (p"%O   {:/#Nc$5       'Recurse directory and search for text files G<L;4nA)       Dim f As String 0{ 5w 6       f = Dir$(in_dir & "*.txt") X]ipI$'+C       While f <> "" /:cd\A}           ReDim Preserve in_flist(fCount) A#e%^{q$           in_flist(fCount) = f wW Lj?;bx           fCount += 1 #|uCgdi           f = Dir$() \[;0KV_       Wend /ixp&Z|7       ReDim Preserve in_flist(fCount-1)