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摘要: (8qMF{ ~_QZiuq& 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。 (\, <RC\ JWr:/? 背景: &&xBq? 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。 >t)vQ&:;u 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。 ]IoJ(4f 图1. RPC Photonics工程漫射体结构及光束投射形状 sczN0*w&C xpxUn8. 9s6@AJf 步骤 4{(uw Sf
B+;i'D 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。 >E|@3g
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T#x 图2. RPC Photonics工程漫射体不同类型的散射数据 9
#TzW9 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) MGfDxHg] 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 -ZlBg~E 例如下所示: R5g-b2Lm Sample name: EDF-C1-56 81eDN6
M\ Merging data from file EDF-C1-56 0-0.txt 7cr@;%# Finished merging RPC data for sample EDF-C1-56 --d<s FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt (8TB*BhQ_ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ]@Y8 !
, a. 创建一个新的散射库 K}tl,MMU b. 散射模型命名 &M,a+|yuY c. 改变散射模型为“Tabulated BSDF”. G+stt(k: 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 ) #:s*)(Qn 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。 q&Y'zyHLP 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, }&I\a g. 点击OK WjW+EF8( 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 '3 w=D
) _T&?H mcy\nAf5% 脚本代码: 9h>nP8 HYyO/U9z|I '#Language "WWB-COM" onRxe\?D( jl;_lcO
Option Explicit 9un]}7^ OSQZ5:g| Sub Main QO0}-wZR 5ppOG_ 'Cleanup k{;"Aj:iL ClearOutputWindow() oGM Ls Oi AZA< Print "Merging RPC Photonics BSDF Data Files" e:fp8 k< SetTextColor(255,0,0) )uC],CbW{ Print "Note: Script should be located in the same folder as the BSDF TXT files." \
T/i]z Print "Note: Do not run this script multiple times without deleting the output file between executions." WSi`)@.XO SetTextColor(0,0,0) |t+M/C0y/ ( NWT/yBx 'Current directory of this script (should be the same as the text files being merged) ^e:C{]S= Dim cDir As String C,~wmS )@ cDir = MacroDir$ & "\" ,yus44w[ zI$^yk-vn 'Array which will be populated with the list of files to be merged eQu%TZ(x-$ Dim fList() As String, curFile As String >J[Bf9)> GetFileList( cDir, fList ) Se<]g$eK?5 n8UQIa4&= Print "" n|2`y? Print "Files found for merging:" m^0r9y, For Each curFile In fList s0uI;WMg Print Chr(9) & curFile wI><kdz Next 2+zE|I. ma9q?H#X 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Yv k
Qh{ Dim nameArray() As String, sampName As String ;iR( Ir nameArray = Split(fList(0)," 0-0.txt") =M'M/vKD sampName = nameArray(0) rqW[B/a{ Print "" HM57b>6 Print "Sample name: " & Chr(9) & sampName A'r 3%mC psyxNM=dN# 'Open an output file and write the FRED header data kP~'C'5Ys Dim outFile As String rCfr&>nn outFile = cDir & sampName & "_FRED.txt" ~,+n_KST; Open outFile For Output As #1 W,"|([t4.\ Print #1, "type bsdf_data" nfpkWyI u{ Print #1, "format angles=deg bsdf=value scale=1" o|Cq#JFG Fd Ezt 'Loop the file list, skip the two header lines and write the remaining data to file OLh`R]Sd Dim lineArray() As String, curLine As Long t\~lGG-p For Each curFile In fList gw~%jD-2 Print "Merging data from file " & curFile Xou1X$$z ReadFile( cDir & curFile, lineArray ) &7z79#1NS For curLine = 2 To UBound(lineArray) JwCv(1$GM Print #1, lineArray(curLine) L1=3_fO Next AzAD76iNv Next ?&;d#z*4 J$6h%Eyo 'Close the output file w}+#w8hu Close #1 X8~dFjhX >dKK [E/[d Print "Finished merging RPC data for sample " & sampName j1_ E^ Print "FRED formatted data file: " & Chr(9) & outFile 7pMl:\ End Sub r@N 0%JZZ n][/c_]q 'Utility function to read the contents of a file into an array of strings. !Ic;;< Function ReadFile(ByVal fileName As String, _ . K`OEdr< ByRef lineArray() As String) As Long A{\#.nC/z @(>XSTh9 ReadFile = -1 vSty.:bY\p Dim oFSO As Object s2f95<B Set oFSO = CreateObject("Scripting.FileSystemObject") b`"E(S / Erase lineArray Q#C;4)e <;O=h;
~| Dim fid As Long L9tjHC] If oFSO.fileexists( fileName ) Then ZeewGa^r fid = FreeFile() n8<o*f&&9> Open fileName For Input As fid T}} 0hs; lineArray = Split(Input(LOF(fid), fid), vbCrLf) AA][}lU:5 Close fid [MSLVTR End If 9~+A<X]Hd Set oFSO = Nothing *9:oTN Return UBound( lineArray ) tP; &$y.8 u I$|M End Function s( @w1tS. zNSix!F Sub GetFileList( ByVal in_dir As String, _ V]b1cDx{ ByRef in_flist() As String ) 5.gM]si m-f"EFmP 'Redimension the file list array csn/h$`-@ Erase in_flist q6A!xQs< R=M"g|U6 'Tracks how many files are found m"Y;GzqQl Dim fCount As Long O%)@> 5#S fCount = 0 .G[y^w)w} z;1y7W!v 'Recurse directory and search for text files [8*Ovd Dim f As String Gvo(iOU f = Dir$(in_dir & "*.txt") .DSn
H6O While f <> "" e&[gde( ReDim Preserve in_flist(fCount) >Gbj1>C} in_flist(fCount) = f shW$V93< fCount += 1 ~;St,Fw<< f = Dir$() !:e|M|T'I* Wend >cwyb9;!kK ReDim Preserve in_flist(fCount-1) }* iag\ B{|g+c% End Sub J6x\_]1:*
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