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摘要: ;b0Q%TDh M
co:eE 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。 b}R_@_<u s0?'mC+p 背景: rS BI'op 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。 y 9]d{:9
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。 y5j:+2|I 图1. RPC Photonics工程漫射体结构及光束投射形状 OOSf<I*> pKc!sdC 9<_hb1' 步骤 03fOm fg)*TR 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。 kzZgNv#G; PK:Lv15"r 图2. RPC Photonics工程漫射体不同类型的散射数据 lz0-5z+\ 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) 6m;>R%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 z[c8W@OJ 例如下所示: iP(MDVg Sample name: EDF-C1-56 Z5q%L!4G Merging data from file EDF-C1-56 0-0.txt l[T-Ak Finished merging RPC data for sample EDF-C1-56 0(y*EJA$ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 9!n:hhJM 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 0vqH-)} a. 创建一个新的散射库 %]LoR$|Y b. 散射模型命名 W/2y;@ c. 改变散射模型为“Tabulated BSDF”.
BjH|E@z d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) S5hc@^|0Z e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 7T)y"PZ f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, Bo"9;F g. 点击OK #g6 _)B=S 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 bPFGQlmIO NRx 7S9W ;
pBLmm*F 脚本代码: XE2Un1i}j1 4~Cf_`X}] '#Language "WWB-COM" ~RbVcB# ~%*l>GkP* Option Explicit ,h^6y @:zC!dR)G Sub Main h~#F2#. bW
W!,-|R 'Cleanup w]gLd ClearOutputWindow() RDbNC v# 6n2RT H Print "Merging RPC Photonics BSDF Data Files" w@-G_-6W SetTextColor(255,0,0) y05!-G:Y\ Print "Note: Script should be located in the same folder as the BSDF TXT files." i<Ms2^ Print "Note: Do not run this script multiple times without deleting the output file between executions." HMUx/M.j SetTextColor(0,0,0) /1LN\Eu !b`fykC 'Current directory of this script (should be the same as the text files being merged) DLbP$&o Dim cDir As String {1)b LG|$ cDir = MacroDir$ & "\" MlWKfe< DL,R~ 'Array which will be populated with the list of files to be merged @-)S*+8 Dim fList() As String, curFile As String : _Y^o GetFileList( cDir, fList ) -`q!mdA2 qY-aR; Print ""
n/;{- Print "Files found for merging:" -J63'bb7oi For Each curFile In fList xCL)<8[R,} Print Chr(9) & curFile 9mvy+XD Next s>G6/TTH6 g=D]=&H 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ,$Fh^KNo] Dim nameArray() As String, sampName As String RbUir185Y nameArray = Split(fList(0)," 0-0.txt") -aJ(-Np$f sampName = nameArray(0) C3 "EZe[R Print "" aN"YEL>w Print "Sample name: " & Chr(9) & sampName Z6gwAvf< LF.i0^#J 'Open an output file and write the FRED header data A(&\wd Dim outFile As String %rs2{Q2k outFile = cDir & sampName & "_FRED.txt" [5xm>Y&} Open outFile For Output As #1 ;L87
%P(. Print #1, "type bsdf_data" `GqF/?i Print #1, "format angles=deg bsdf=value scale=1" |u`YT;`!"-
[uqr 'Loop the file list, skip the two header lines and write the remaining data to file 6p;Pf9
f Dim lineArray() As String, curLine As Long 7Z]?a For Each curFile In fList tz65Tn_M Print "Merging data from file " & curFile >%6j -:S ReadFile( cDir & curFile, lineArray ) ("A45\5 For curLine = 2 To UBound(lineArray) w:B&8I(n}w Print #1, lineArray(curLine)
}kAE Next @B{ Next t#M[w|5? MV<)qa T 'Close the output file :D}?H@(69 Close #1 EO'+r[Y 2O(k@M5E? Print "Finished merging RPC data for sample " & sampName TS=%iMa Print "FRED formatted data file: " & Chr(9) & outFile gz'{l[ End Sub miBCq l@x ~+ae68{p 'Utility function to read the contents of a file into an array of strings. c5f57Z Function ReadFile(ByVal fileName As String, _ o r ~@! ByRef lineArray() As String) As Long z1RHdu0;z w2 (}pz: ReadFile = -1 .nr%c*JUp Dim oFSO As Object ?>=vKU5 Set oFSO = CreateObject("Scripting.FileSystemObject") 0* ^f
EoV Erase lineArray
svo%NQ #\F8(lZ Dim fid As Long ]mJ9CP8P1c If oFSO.fileexists( fileName ) Then )jI4]6 fid = FreeFile() 1jSmTI d Open fileName For Input As fid f3,Xb
]h lineArray = Split(Input(LOF(fid), fid), vbCrLf) /q]fG Close fid LfnQcI$kO End If V'.gE6we Set oFSO = Nothing #I ,c'Vj Return UBound( lineArray ) fiAj#mX 9[E/^
End Function ,iiI5FR 4wS!g10 } Sub GetFileList( ByVal in_dir As String, _ UWCm:eRQ ByRef in_flist() As String ) K=sk1<>)m ;rh=63g 'Redimension the file list array 10dK%/6/O Erase in_flist }&ew}'*9) kYS\TMt,C 'Tracks how many files are found EA:_PBZ Dim fCount As Long bnp:J|(ld fCount = 0 PwAmnk ! IOrYm 'Recurse directory and search for text files {yBd{x<>/ Dim f As String }
F*=+n f = Dir$(in_dir & "*.txt") U$ZbBVa`~ While f <> "" "g!/^A!! ReDim Preserve in_flist(fCount) \<=.J`o{ in_flist(fCount) = f 3z
5"Ckzb fCount += 1 |[bQJ<v6 f = Dir$() &M\qVL%w Wend \Zk<|T61$ ReDim Preserve in_flist(fCount-1) b!;WF
K8iQ? End Sub K!88 Nox( toox`| dfeN_0`- QQ:2987619807 Bm^8"SSN
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