RPC Photonics扩散片BSDF

Px}#{fkS   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

swnov[0   摘要： HQ+:0"B   c;ELAns>   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。 |YQ:4'^"   s"G6aM   背景： EpCUL@+   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。 x1$tS#lS   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 =1%3". "n@   1k\1U   L;'+O u   XWbe|K!e   步骤 #:3E.=   .c+RFX@0   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 BjJ$I^   图2. RPC Photonics工程漫射体不同类型的散射数据 <vA^%D<\~   Ne.W-,X^cL   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） ~/hP6*   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 \sF}NBNT@   例如下所示： @B~/0 9   Sample name:  EDF-C1-56 w'.ny<Pe   Merging data from file EDF-C1-56 0-0.txt !o&Mw:d   Finished merging RPC data for sample EDF-C1-56 d;(L@9HHD   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt *Rj>// A   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 } CJQC   a. 创建一个新的散射库 Zi2NgVF   b. 散射模型命名 QKbX^C   c. 改变散射模型为“Tabulated BSDF”. aIZ@5w"7   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 ） ^&DHBx"J   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。 NwuME/C7#   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， Om{[ <tL   g. 点击OK Ps.O.2Z5ZB   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 W9Bl'e   Cfb/f]*M   -";'l@D=   脚本代码： z(3mhMJY   #=b_!~:%   '#Language "WWB-COM" sN7I~   .7Ys@;>B   Option Explicit Y1Bj++?2   7vcYI#(2 Y   Sub Main )AqM?FE4R   ,ibI@8;#~'       'Cleanup ]ODC+q1       ClearOutputWindow() EUe2<G   0;3;Rs       Print "Merging RPC Photonics BSDF Data Files" P QXyu1       SetTextColor(255,0,0) q[1H=+       Print "Note: Script should be located in the same folder as the BSDF TXT files." 1p23&\\~       Print "Note: Do not run this script multiple times without deleting the output file between executions." m^O:k"+!       SetTextColor(0,0,0) KcfW+>W3   @"kA&=0;|J       'Current directory of this script (should be the same as the text files being merged) \%EZg       Dim cDir As String av gGz8       cDir = MacroDir$ & "\" RV^2[Gdi   vP3Fb;       'Array which will be populated with the list of files to be merged bUAjt>+       Dim fList() As String, curFile As String %g0"Kj5       GetFileList( cDir, fList ) *WfOB2rU   &EmxSYL>       Print "" . %tc7`k8       Print "Files found for merging:" PFG):i-?       For Each curFile In fList 5cxA,T           Print Chr(9) & curFile NV*aHci       Next t_3)}   X5qU>'?`       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. sG0cN;I]t       Dim nameArray() As String, sampName As String k^]+I%?Q       nameArray = Split(fList(0)," 0-0.txt") .pi#Z/v       sampName  = nameArray(0) =9 YyUAJZ       Print "" l8GziM{lp       Print "Sample name: " & Chr(9) & sampName `wB(J%w   68Wm=j.m       'Open an output file and write the FRED header data p."pI Bd       Dim outFile As String _myam3[W       outFile = cDir & sampName & "_FRED.txt" |j^>6nE       Open outFile For Output As #1 0d`s(b54;O       Print #1, "type bsdf_data" {NKDmeg:D       Print #1, "format angles=deg bsdf=value scale=1" /.$n>:XR   HG=!#-$9       'Loop the file list, skip the two header lines and write the remaining data to file %I(N       Dim lineArray() As String, curLine As Long uc=-+*D'I       For Each curFile In fList mV`Z]-$$i           Print "Merging data from file " & curFile [ #A!B#`           ReadFile( cDir & curFile, lineArray ) #rzxFMA"           For curLine = 2 To UBound(lineArray) %nF6n:|:               Print #1, lineArray(curLine) /qo.Z           Next .4_EaQ;jX       Next 6g@j,iFy   HHWB_QaL       'Close the output file ',kYZay       Close #1 3UD_2[aqN(   I@+dE V`Lf       Print "Finished merging RPC data for sample " & sampName He)v:AH       Print "FRED formatted data file: " & Chr(9) & outFile <|h vH   End Sub eO(VSjo'`   lp!@uoN^T   'Utility function to read the contents of a file into an array of strings. G}BO!Z6   Function ReadFile(ByVal fileName As String, _ '"~|L>F%G                     ByRef lineArray() As String) As Long *@cXBav/<   !ygh`]6V       ReadFile = -1 JT[|l-\zo       Dim oFSO As Object yew9bn0a=       Set oFSO = CreateObject("Scripting.FileSystemObject") UR1U; k       Erase lineArray tE3!;   o`M7:8G       Dim fid As Long 8.{5c6G       If oFSO.fileexists( fileName ) Then !wJ~p:vRdY           fid = FreeFile() C[& \Xq           Open fileName For Input As fid `cy_@Z5A           lineArray = Split(Input(LOF(fid), fid), vbCrLf) -?2ThvT           Close fid {]Nvq9?       End If |"5NI'X?       Set oFSO = Nothing g>/,},jv[x       Return UBound( lineArray ) Rzj5B\+Rk(   p8%x@%k   End Function E2LpQNvN%g   p r(:99~3   Sub GetFileList( ByVal in_dir As String, _ ~U~ KUL|                    ByRef in_flist() As String ) .N5}JUj   ^7Z)/c`"       'Redimension the file list array w/~,mzM"       Erase in_flist *-3K],^a   ,m8l /wG       'Tracks how many files are found HB|| 'gIC       Dim fCount As Long < :<E~anH       fCount = 0 ]A5FN4 E   3RXq/E       'Recurse directory and search for text files 2?z3s|+[       Dim f As String QyJ}zwD       f = Dir$(in_dir & "*.txt") ;&s`g        While f <> "" ^0pd- n@pn           ReDim Preserve in_flist(fCount) fp.,MIS           in_flist(fCount) = f ,=Xr'7w,           fCount += 1 |k^'}n           f = Dir$() ,gUSW       Wend Ra%RcUf~sh       ReDim Preserve in_flist(fCount-1)