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摘要: 5q[0;`J Tfc5R;Rw 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。 VNx|nP& DKL< "#.7 背景: ;u LD_1% 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。 %-@`| 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。 /#J)EH4p 图1. RPC Photonics工程漫射体结构及光束投射形状 -d\O{{%>.z w5"C<5^ 3=xb%Upw 步骤 T*>n
a8W VHXvm* 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。 gP.Q_/V }fw;{&s{z 图2. RPC Photonics工程漫射体不同类型的散射数据 nf!RB-orF 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) 4cK6B)X 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 P[PBoRd2 例如下所示: lp5`Kw\ Sample name: EDF-C1-56 !Y_"q^5GG' Merging data from file EDF-C1-56 0-0.txt ~~]/<d Finished merging RPC data for sample EDF-C1-56 yn<z!z%mz FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ug!DL=ZW 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 .E|Hk,c9 a. 创建一个新的散射库 6~\z]LZ b. 散射模型命名 ~uRG~,{rH c. 改变散射模型为“Tabulated BSDF”. :bMCmY 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 ) wL,b.] 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。 MGIpo[ 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, 5,>1rd<B g. 点击OK NUBzm nA>8 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 v=?U{{xQ j.4oYxK!s/ #V[?puE@ 脚本代码: -CW&!oW Lys4l$J] '#Language "WWB-COM" k;:v~7VF "Iu[)O% Option Explicit p8y_uNQE +uW$/_Y$ Sub Main x Yr-,$/ I,Q"<?& 'Cleanup ,LZ6Wu$P ClearOutputWindow() jJl6H~
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f Print "Merging RPC Photonics BSDF Data Files" xI'<4lo7Z SetTextColor(255,0,0) >%+"-bY Print "Note: Script should be located in the same folder as the BSDF TXT files." dz.]5R Print "Note: Do not run this script multiple times without deleting the output file between executions." ]@1YgV SetTextColor(0,0,0) ke|v|@ V
?3>hQtB 'Current directory of this script (should be the same as the text files being merged) }[Uh4k8P Dim cDir As String e;pVoRI cDir = MacroDir$ & "\" ]9)pFL X"b4U\A 'Array which will be populated with the list of files to be merged h{.KPK\ Dim fList() As String, curFile As String [8.ufpZ GetFileList( cDir, fList ) zvL&V
.> ` 1DJwe2 Print "" "5e~19 Print "Files found for merging:" VB*N;bM^ For Each curFile In fList ws
tI8"> Print Chr(9) & curFile /ee:GjUkB Next t$r^'ZN 0"o<(1 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. -@i)2J_WP Dim nameArray() As String, sampName As String <Hhl=6op nameArray = Split(fList(0)," 0-0.txt") &'Qz sampName = nameArray(0) Y+<C[Fiq Print "" uOc>~ITPS Print "Sample name: " & Chr(9) & sampName ]4\^> :gY$/1SYD 'Open an output file and write the FRED header data *wP8)yv7 Dim outFile As String dra'1E outFile = cDir & sampName & "_FRED.txt" 5/DTE:M< Open outFile For Output As #1 :ORCsl6- Print #1, "type bsdf_data" 7CUu:6% Print #1, "format angles=deg bsdf=value scale=1" &T]+g8 '' %0INtq 'Loop the file list, skip the two header lines and write the remaining data to file QL}5vSl Dim lineArray() As String, curLine As Long KSVIX!EsX For Each curFile In fList F/ 2@%,2n Print "Merging data from file " & curFile #`:s:bwM: ReadFile( cDir & curFile, lineArray ) 0~A<AF*t For curLine = 2 To UBound(lineArray) I!jSAc{ Print #1, lineArray(curLine) N<hbV0$ % Next [Z,AquCU( Next '0X!_w6W xC`Hm?kM 'Close the output file p*!@z|F>U Close #1 mLk@&WxG m0 ]LY-t Print "Finished merging RPC data for sample " & sampName n)} J< Print "FRED formatted data file: " & Chr(9) & outFile x`PIJE End Sub dJ?VN!B0 y4VCehdJ
'Utility function to read the contents of a file into an array of strings. :tdx: Function ReadFile(ByVal fileName As String, _ 3`TC* ByRef lineArray() As String) As Long JwB:NqB zJI/j
_~W ReadFile = -1 dpZ7eJ Dim oFSO As Object ,TOLr%+v~n Set oFSO = CreateObject("Scripting.FileSystemObject") X~0l1 @! Erase lineArray YC&iH>jO3 yZK1bnYG|I Dim fid As Long pW:h\}%`n If oFSO.fileexists( fileName ) Then !/< 5.9!9r fid = FreeFile() PZNo.0M70 Open fileName For Input As fid =t@m: lineArray = Split(Input(LOF(fid), fid), vbCrLf) x~ s> Close fid }yx{13:[ End If MP[v 9m@ Set oFSO = Nothing FtM7+>Do. Return UBound( lineArray ) $DA0lY\ {9;~xxTo End Function wuzz Wq <B`}18x Sub GetFileList( ByVal in_dir As String, _ -/x +M-X# ByRef in_flist() As String ) m80+b8b "1%<IqpU+ 'Redimension the file list array dadOjl)S) Erase in_flist :FG}k Y gywI@QD%# 'Tracks how many files are found `Kym{og Dim fCount As Long :N8D1e-a fCount = 0 kjNA~{ :m#vvH 'Recurse directory and search for text files L!S-f4^5 Dim f As String Pdf_{8r f = Dir$(in_dir & "*.txt") n/$Bd FH While f <> "" %T'?7^\> ReDim Preserve in_flist(fCount) ~e{2Y% in_flist(fCount) = f YD.3FTNGC fCount += 1 KG>.7xVWV7 f = Dir$() {!N4| Wend wB9IP{Pf ReDim Preserve in_flist(fCount-1) FT|*~_@ |]GEJUWtCd End Sub DIk$9$"<x
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