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摘要: 8PWEQ<ev7> >&^jKfY 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。 I<+:Ho=6 p\.IP2+c 背景: c:
(nlYZ 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。 6` Aw!&{ 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。 cIrc@ 图1. RPC Photonics工程漫射体结构及光束投射形状 dfZ`M^NU 7 y$a=+D i U~M!T#\s 步骤 tZu1jBO_Q4 Hxleh><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。 ?},RN k~,
k@mR 图2. RPC Photonics工程漫射体不同类型的散射数据 /!`xqG# 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) I~;H'7|e 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 'ud[#@2 例如下所示:
;kT~&.,y Sample name: EDF-C1-56 *.Z~f"SZy* Merging data from file EDF-C1-56 0-0.txt 91nw1c! Finished merging RPC data for sample EDF-C1-56 a>Zp?*9 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt J"TF@7{p 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 J93xxj a. 创建一个新的散射库 !/=.~B b. 散射模型命名 3e1P!^'\ c. 改变散射模型为“Tabulated BSDF”. C;.,+(G 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 ) &
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#zN] 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。 !0F+qzGG7 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, p+dOw# g. 点击OK 0Q)YZ2 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 _KkP{g,Y 2.MY8}&WBu OB*V4Yv 脚本代码: S0}=uL#dt 8pZ Ogh
'#Language "WWB-COM" {w7/M]m- %joL}f[ Option Explicit s'$2 }K
%.onO0}) Sub Main DgY
!)cS V)vik 'Cleanup 14 (sp ClearOutputWindow() fPPmUM^C9 $g/h=w@ Print "Merging RPC Photonics BSDF Data Files" sV\K[4HG SetTextColor(255,0,0) |68k9rq Print "Note: Script should be located in the same folder as the BSDF TXT files." <XN=v!2; Print "Note: Do not run this script multiple times without deleting the output file between executions." "M3;>"`G SetTextColor(0,0,0) /'b7q y FZLx.3k4 'Current directory of this script (should be the same as the text files being merged) UM<s#t`\3 Dim cDir As String =%c\<<]aV cDir = MacroDir$ & "\" $48Z>ij?f +_+j"BT 'Array which will be populated with the list of files to be merged `*U$pg Dim fList() As String, curFile As String o"_'cNAz GetFileList( cDir, fList ) %%zlqd"0 beSU[ Print "" Rd|8=`) Print "Files found for merging:" ZY@ntV? For Each curFile In fList J0oeCb Print Chr(9) & curFile *[|+5LVn Next &b7_%,Bx4 ]}p<P):hO 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. P{yb%@I~J Dim nameArray() As String, sampName As String x":o*(rSQ nameArray = Split(fList(0)," 0-0.txt") =O-irGms* sampName = nameArray(0) -'SA&[7dP Print "" 6U.|0mG[ Print "Sample name: " & Chr(9) & sampName QR _h#N2h u05Yy&(f 'Open an output file and write the FRED header data ;{q* Dim outFile As String
?r@^9 outFile = cDir & sampName & "_FRED.txt" =I@I Open outFile For Output As #1 Ak8Y?#"wz Print #1, "type bsdf_data" ! Dj2/][ Print #1, "format angles=deg bsdf=value scale=1" v"Ax'() ,wXmJ)/WZ 'Loop the file list, skip the two header lines and write the remaining data to file VpSpj/\m)' Dim lineArray() As String, curLine As Long _SJ:|I For Each curFile In fList w6WPfy(/2 Print "Merging data from file " & curFile =:]v~Ehq ReadFile( cDir & curFile, lineArray ) R&a$w8 For curLine = 2 To UBound(lineArray) T ~(Sc'8 Print #1, lineArray(curLine) X8R`C0
Next Lj9RF<39g Next
o?m/ RAP-vVh/C 'Close the output file ~BX=n9 Close #1 RtzSe$O x5mg<y2`Ng Print "Finished merging RPC data for sample " & sampName ^gZ,A]
Print "FRED formatted data file: " & Chr(9) & outFile M
+r!63T End Sub : -d_ rp{|{>'`.q 'Utility function to read the contents of a file into an array of strings. `fTM/" Function ReadFile(ByVal fileName As String, _ kS:#|yY8% ByRef lineArray() As String) As Long m!ueqV" -THMTRFz ReadFile = -1 _#s,$K# Dim oFSO As Object |K06H
?6X Set oFSO = CreateObject("Scripting.FileSystemObject") kFV, Fg Erase lineArray +38R#2JV nS*Y+Q^9a Dim fid As Long \r[u>7I If oFSO.fileexists( fileName ) Then /:'>-253 fid = FreeFile() rxH]'6kP Open fileName For Input As fid i>s lineArray = Split(Input(LOF(fid), fid), vbCrLf) ,<r&]
eC Close fid ;'= cNj End If e)g&q'O Set oFSO = Nothing Mjy:k|aY" Return UBound( lineArray ) mpMAhm: G7Sw\wW End Function d%"XsbO ow.!4kx{ d Sub GetFileList( ByVal in_dir As String, _ gJ'pwSA ByRef in_flist() As String ) d6YXITL)\> pX?3inQP%( 'Redimension the file list array Bhd)# P Erase in_flist .'gm2 HdJ g 'Tracks how many files are found U5OX.0 Dim fCount As Long pB8D fCount = 0 r(46jV.sD: DylO;+ 'Recurse directory and search for text files aQtd6L+ J Dim f As String h<`aL;.g f = Dir$(in_dir & "*.txt") `KFEzv While f <> "" 4JAz{aw'b ReDim Preserve in_flist(fCount) 7GYf#} N in_flist(fCount) = f 2Jd(@DcJ2C fCount += 1 !i^"3!.l,] f = Dir$() *;Mi/^pzK Wend VAz4@r7hkq ReDim Preserve in_flist(fCount-1) LV^^Bd8Ct q[,p#uJ] End Sub '|[V}K5m/f
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