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摘要: nD|Bo 9 T=9+ 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。 CPAizS DdPU\ ZWR 背景: tK1P7pbC8r 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。 XXvM*"3D5 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。 3(jI 图1. RPC Photonics工程漫射体结构及光束投射形状 <\Lii0hi! eWE7>kwh p v%`aQ]o{ 步骤 Iy'a2@
ZE#A?5lb 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。 s@V4ny9x 5@6F8:x}V 图2. RPC Photonics工程漫射体不同类型的散射数据 l 'm!e '7_ 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) m>DBO|` 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 Xnpw'<~X 例如下所示: K8daSvc Sample name: EDF-C1-56 PS**d$ S Merging data from file EDF-C1-56 0-0.txt s: pmB\ Finished merging RPC data for sample EDF-C1-56 =wtu FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt G*JasHFs 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 s$s~p
+U a. 创建一个新的散射库 y38x^fuYJ~ b. 散射模型命名 Z0 @P1 c. 改变散射模型为“Tabulated BSDF”. IN~Q(A]Z% d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Z7J8%ywQ e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 '9.L5*wh] f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, xim'TVwvC g. 点击OK LR%]4$ /M 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 f0S$p
R wF[%+n (* ?$J#jhR? 脚本代码: gwO]U=Y {Dup k0'( '#Language "WWB-COM" {el[W,CT# n.F^9j+V Option Explicit =^3 Z
L .Yg7V'R1 Sub Main wNMf-~ *sz:c3{_ 'Cleanup V(wm?Cc] ClearOutputWindow() 2Kwr=t B:oE&Ahh{ Print "Merging RPC Photonics BSDF Data Files" C( wZjO?N SetTextColor(255,0,0) "!,)Pv Print "Note: Script should be located in the same folder as the BSDF TXT files." #l 7(WG Print "Note: Do not run this script multiple times without deleting the output file between executions." M$,4B SetTextColor(0,0,0) =/kwUjC? Qv1<)&Ft< 'Current directory of this script (should be the same as the text files being merged) %^pm~ck! Dim cDir As String GBSuTu8 cDir = MacroDir$ & "\" @5}(Y( @ ;x,yGb` 'Array which will be populated with the list of files to be merged 5LaF'>1yY Dim fList() As String, curFile As String
}o[NB GetFileList( cDir, fList ) 'u}OeS"f C:r3z50 Print "" R/EpfYOX Print "Files found for merging:" )kIZmQ|f1 For Each curFile In fList Fzmc#? Print Chr(9) & curFile JO-FnoQK Next s+0n0C mlLx!5h= 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. tfIUH'Ez> Dim nameArray() As String, sampName As String 2=IZD `{! nameArray = Split(fList(0)," 0-0.txt") k|4}Do%; sampName = nameArray(0) s7?d_+O Print "" -J":'xCP! Print "Sample name: " & Chr(9) & sampName O%s7 }bR3 aOhi<I`* 'Open an output file and write the FRED header data p54e'Zb Dim outFile As String d~qZ;uw outFile = cDir & sampName & "_FRED.txt" ech1{v\B| Open outFile For Output As #1 |BEoF[1 Print #1, "type bsdf_data" blx"WVqo Print #1, "format angles=deg bsdf=value scale=1" T-F8[dd^/ *JArR1J 'Loop the file list, skip the two header lines and write the remaining data to file kF-7OX0) Dim lineArray() As String, curLine As Long T&ib]LmR For Each curFile In fList E3V_qT8 Print "Merging data from file " & curFile OE/r0C<& ReadFile( cDir & curFile, lineArray ) 6GMwB@ b For curLine = 2 To UBound(lineArray) * `3+x Print #1, lineArray(curLine) e'X"uH Xt. Next NqC}}N\, Next @rE+H
5 NCp]!=uM; 'Close the output file 7*eIs2aY Close #1 ("s!t?!&YS &ox5eX( Print "Finished merging RPC data for sample " & sampName AzMX~cd Print "FRED formatted data file: " & Chr(9) & outFile ^tL]QE?| End Sub a\m0X@Q ;"2(e7ir 'Utility function to read the contents of a file into an array of strings. Wgm{
]9Q Function ReadFile(ByVal fileName As String, _ PG{"GiZz= ByRef lineArray() As String) As Long Bq~?!~\?. nNhb,J ReadFile = -1 ZMEYF!jN Dim oFSO As Object lm8<0*;, Set oFSO = CreateObject("Scripting.FileSystemObject") +{\b&q_ Erase lineArray !DBaC%TGC wV q4DE Dim fid As Long H<Zs2DP` If oFSO.fileexists( fileName ) Then :M$8<03>F fid = FreeFile() R:y u Open fileName For Input As fid RY}:&vWDk lineArray = Split(Input(LOF(fid), fid), vbCrLf) Tffdm Close fid Of;$
VK' End If [Qn=y/._r Set oFSO = Nothing ;F:Qz^=.a Return UBound( lineArray ) :+<GJj_d+ rsD?
;XzH End Function r12e26_Ab 7
V=%&+ Sub GetFileList( ByVal in_dir As String, _ `aL4YH-v ByRef in_flist() As String ) 7#sb},J{ LIh71Vg/cc 'Redimension the file list array Lf+3nN Erase in_flist =k2"1f~e pAH9 'Tracks how many files are found i}kMo@ Dim fCount As Long nm`}Z'&) fCount = 0 J%P{/ nR
L[Y|K%;~ 'Recurse directory and search for text files xHaoSs*C9 Dim f As String +IM6 GeH f = Dir$(in_dir & "*.txt") 84c[ Z While f <> "" }/VSIS@Z ReDim Preserve in_flist(fCount) -O6\!Wo=- in_flist(fCount) = f *oru;=D@8 fCount += 1 E#`JH f = Dir$() hQLh}}B Wend t_iZ\_8 ReDim Preserve in_flist(fCount-1) Dl_SEf6b CW@G(R End Sub HE*P0Yf=
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