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摘要: 3K?0PRg k9Sqp:l, 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。 6ZG)`u".(" Tc88U8Gc 背景: 4[J3HLQ 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。 0X0D8H(7Q 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。 #Y5I_:k 图1. RPC Photonics工程漫射体结构及光束投射形状 xeI ,Kz." Xl/G|jB9 g?>AY2f[5 步骤 44W3U~1 %C3cdy_c 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。 ,g,jY]o 9iF e^^<ss 图2. RPC Photonics工程漫射体不同类型的散射数据 -YuvEm#f 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) jYy0^)6X( 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 Y;Ur8q 例如下所示: EkL\~^ Sample name: EDF-C1-56 *b)b#p Merging data from file EDF-C1-56 0-0.txt y:A0!75 Finished merging RPC data for sample EDF-C1-56 \9}5}X_x. FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt r6$=|Yto 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 %b{!9-n} a. 创建一个新的散射库 Qi[D&47XO b. 散射模型命名 bY2Mw8e% c. 改变散射模型为“Tabulated BSDF”. zl:D|h77 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 ) x>J3tp$2 e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ;yZ N
"r f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, 4jz]c"p- g. 点击OK 7P`1)juA9 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 MzG ryM- u.[JYZ
q],R6GcVr 脚本代码: >1~`tP h]Oplp4\W '#Language "WWB-COM" 5qr!OEF2 j?,*fp8 Option Explicit O0{ !p&'so^-W Sub Main ? g{,MP5 =|!~0O 'Cleanup O<h#|g1 ClearOutputWindow() Qf|}%}%fp K D-_~uIF Print "Merging RPC Photonics BSDF Data Files" 7:L~n(QpP SetTextColor(255,0,0) 4sj%: Print "Note: Script should be located in the same folder as the BSDF TXT files." 1QJ$yr Print "Note: Do not run this script multiple times without deleting the output file between executions." B<XPu=| SetTextColor(0,0,0) 3rY /6{ 2A%T!9J3 'Current directory of this script (should be the same as the text files being merged) E`4=C@NN+, Dim cDir As String kV rT? cDir = MacroDir$ & "\" GF!{SO4 %'T>kz *A 'Array which will be populated with the list of files to be merged y|Y3,s Dim fList() As String, curFile As String WHZng QmY GetFileList( cDir, fList ) B%@!\D# [U(&Ae0V> Print "" w)eQ'6Vu Print "Files found for merging:" ptv4v[gQ For Each curFile In fList ijqdZ+ Print Chr(9) & curFile %gMpV Next R{o*O_qX #=H}6!18 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 3Gl]g/ Dim nameArray() As String, sampName As String otVyuh nameArray = Split(fList(0)," 0-0.txt") *wB-lg7% sampName = nameArray(0) ]0i2]=J&, Print "" \u_v7g Print "Sample name: " & Chr(9) & sampName ePpK+E[0Z 'B5J.Xe: 'Open an output file and write the FRED header data
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}N4u Dim outFile As String /C"s_:m;3 outFile = cDir & sampName & "_FRED.txt" '%!M>rY, Open outFile For Output As #1 OPY/XKyY, Print #1, "type bsdf_data" W:poUG1UR Print #1, "format angles=deg bsdf=value scale=1" d+2O^of:T |J Q:.h 'Loop the file list, skip the two header lines and write the remaining data to file A4Q)YY9~ Dim lineArray() As String, curLine As Long .(1j!B4^ For Each curFile In fList WQLL[{mhS Print "Merging data from file " & curFile %H}Y]D~R ReadFile( cDir & curFile, lineArray ) e~s7ggg2k For curLine = 2 To UBound(lineArray) n{Qh8" Print #1, lineArray(curLine) Z)O>h^0 Next T7,Gf({ Next :z} _y&] Z^`=!n-V 'Close the output file _d0-%B
9m Close #1 SxW}Z_8x fI
d) Print "Finished merging RPC data for sample " & sampName 3zA=q[C Print "FRED formatted data file: " & Chr(9) & outFile q\b
?o!#_ End Sub lzy$.H"W e=]oh$] 'Utility function to read the contents of a file into an array of strings. jbhJ;c : Function ReadFile(ByVal fileName As String, _ Go+xL/f ByRef lineArray() As String) As Long 3Ra\2(bR G2+)R^FSC ReadFile = -1 ;Jbc'V'fm Dim oFSO As Object Sp~Gv>uMK Set oFSO = CreateObject("Scripting.FileSystemObject") Bx}0E Erase lineArray h>^jq{yu (_&V9vat= Dim fid As Long aC8,Y$>?E` If oFSO.fileexists( fileName ) Then >,"D9! fid = FreeFile() %AEK[W+0 Open fileName For Input As fid G\:psx/ lineArray = Split(Input(LOF(fid), fid), vbCrLf) 6KCCbg/ Close fid *L4]\wf End If hKH$AEHEU} Set oFSO = Nothing 3dxnh,]&@ Return UBound( lineArray ) bDZKQ& o9T@uWh+ End Function ]EVe@ S QM(8*:X Sub GetFileList( ByVal in_dir As String, _ *t?~)o7 ByRef in_flist() As String ) }KD7 Y pRrqs+IJZ\ 'Redimension the file list array KT
lP:pB; Erase in_flist {+/
.5 rAlh&
?X 'Tracks how many files are found G>[
NZE Dim fCount As Long Rg8m4x w fCount = 0 '!+P{ 2Z/][?Jj{ 'Recurse directory and search for text files yBPt%EF Dim f As String _UH/}!nqB f = Dir$(in_dir & "*.txt") C>Omng1>^ While f <> "" :_o] F ReDim Preserve in_flist(fCount) -TK|Y" in_flist(fCount) = f Nl$gU3kL fCount += 1 Z^'?|qFj! f = Dir$() RV0>-@/x Wend ih+*T1#:( ReDim Preserve in_flist(fCount-1) \A'|XdQ ba(arGZ+{ End Sub iA55yT+
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