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摘要: JKy~'>Q 6b9J3~d\E 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。 x2'pl
(^ =-,'LOE 背景: ci/qm\JI<< 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。 @_W13@| 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。 \0vs93>? 图1. RPC Photonics工程漫射体结构及光束投射形状 (L yK o #2Iag'4T i<):%[Q)> 步骤 gA%
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9p Q 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。 vn!3Z! dm( :(wFNK/0{ 图2. RPC Photonics工程漫射体不同类型的散射数据 FBbaLqgVF{ 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) sN2m?`?"G 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 BC\W`K 例如下所示: Gp+\}<^Z Sample name: EDF-C1-56 `'&mO9,<- Merging data from file EDF-C1-56 0-0.txt :H wdXhA6 Finished merging RPC data for sample EDF-C1-56 Ln t 1 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt HUAYtUBH 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 H5V>d a. 创建一个新的散射库 x/wgD'? b. 散射模型命名 V )1.)XC c. 改变散射模型为“Tabulated BSDF”. dfKGO$}V 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 ) vbd)L$$20+ 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。 W)J MV 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, /|<SD.: g. 点击OK &GkD5b 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 *HUXvX|-% a(=lQ(v/? {dm>]@"S 脚本代码: )RT?/N W %ek0NBE7 '#Language "WWB-COM" Pq8oK'z- 9t6c*|60#n Option Explicit |cgjn*a?M K&Bbjb_| Sub Main Y;%LwDC =J)<Nx.gA 'Cleanup CtV|oeJ ClearOutputWindow() r-TrA$k x^EW'-a Print "Merging RPC Photonics BSDF Data Files" T&+3Xi: SetTextColor(255,0,0) }Z FoCMM Print "Note: Script should be located in the same folder as the BSDF TXT files." q6w)zTpJGJ Print "Note: Do not run this script multiple times without deleting the output file between executions." yNowhh SetTextColor(0,0,0) {\CWoFht> 4(LLRzzW 'Current directory of this script (should be the same as the text files being merged) yCav;ZS_ Dim cDir As String V7r_Ubg@K cDir = MacroDir$ & "\" 8'jt59/f )$bF* 'Array which will be populated with the list of files to be merged u!5q)>Wt( Dim fList() As String, curFile As String MP)Prl> GetFileList( cDir, fList ) Nw$OJ9$L>
..X _nF Print "" 7 QNx*8 p Print "Files found for merging:" Q;w[o For Each curFile In fList DXI4DM"15I Print Chr(9) & curFile Z,e|L4& Next v/9ZTd KFwuz()7 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. peBHZJ``RX Dim nameArray() As String, sampName As String $!MP0f\q
g nameArray = Split(fList(0)," 0-0.txt") #dL,d6a sampName = nameArray(0) wbrOL(q.m Print "" (
_6j@?u Print "Sample name: " & Chr(9) & sampName 6PYt>r&TO 't&1y6Uu 'Open an output file and write the FRED header data fmj}NV&ma Dim outFile As String _.Hj:nFHz outFile = cDir & sampName & "_FRED.txt" Ux*xz|^ Open outFile For Output As #1 )9_W"'V Print #1, "type bsdf_data" G3io!XM)D Print #1, "format angles=deg bsdf=value scale=1" "Zh,;)hS SsTBjIX 'Loop the file list, skip the two header lines and write the remaining data to file nPdkvs Dim lineArray() As String, curLine As Long ^tGAJ_b79 For Each curFile In fList cZ|*Zpk Print "Merging data from file " & curFile 41<h|WA ReadFile( cDir & curFile, lineArray ) DxNob-Fr For curLine = 2 To UBound(lineArray) 5\C(2naf Print #1, lineArray(curLine) &)tiO>B^6 Next 4@3 \Ihv Next Dg.~"h5mT AXHY$f| 'Close the output file r=0PW_r: Close #1 #o/;du RU7+$Z0K Print "Finished merging RPC data for sample " & sampName ?.Vuet Print "FRED formatted data file: " & Chr(9) & outFile (WC
=om End Sub JX&]>#6|E v#&;z_I+ 'Utility function to read the contents of a file into an array of strings. ~6n|GxR.[ Function ReadFile(ByVal fileName As String, _ A{T9-f@X ByRef lineArray() As String) As Long
~deS* zPp22 ReadFile = -1 s_/@`kd{ Dim oFSO As Object xOKJOl Set oFSO = CreateObject("Scripting.FileSystemObject") iv_3R}IbX Erase lineArray 9)v]jk lf>d{zd5 Dim fid As Long s(3u\#P If oFSO.fileexists( fileName ) Then 5@%Gq)z5 fid = FreeFile() F\xIVY Open fileName For Input As fid -LRx}Mb9 lineArray = Split(Input(LOF(fid), fid), vbCrLf) DZ2gnRg Close fid "$farDDoF End If ;&=CZ6vH Set oFSO = Nothing -d'FKOD Return UBound( lineArray ) OU7OX]h aC2Vz9e End Function Z40k>t
D JseKqJ?g Sub GetFileList( ByVal in_dir As String, _ x}K|\KXy ByRef in_flist() As String ) c=\ _[G( }Y.YJXum 'Redimension the file list array w/o^OjwQ Erase in_flist e8> X5 Zqm%qm: 'Tracks how many files are found `)y
;7%- Dim fCount As Long RNw#sR fCount = 0 W`9{RZ' C;HEvq7 'Recurse directory and search for text files k{;?>=FH! Dim f As String S;#:~?dU f = Dir$(in_dir & "*.txt") I2CI9,0 While f <> "" YQC.jnb2 ReDim Preserve in_flist(fCount) )yb~ kbe in_flist(fCount) = f z_xy*Iif fCount += 1 Ur< (TM f = Dir$() 5l8F.LtO\ Wend L]z8'n, ReDim Preserve in_flist(fCount-1) dNf9,P_} !`=iKe&%E End Sub 6/L[`n"G
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