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摘要: 9ENI%Jz }9&dY!h + 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。 k SgE_W) _?bO
/y_y 背景: 7O:g;UI# 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。 (][-()YV 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。 JW)f'r_f 图1. RPC Photonics工程漫射体结构及光束投射形状
J5';Hb) uP(t+}dQ+3 $HtGB] 步骤 yDWBrN._ [A~ Hl 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。 :wG
) :(wFNK/0{ 图2. RPC Photonics工程漫射体不同类型的散射数据 1b86@f 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) ^bP`Iv 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: WIuYSt)h Sample name: EDF-C1-56 7?{y&sf Merging data from file EDF-C1-56 0-0.txt %V+"i_{m Finished merging RPC data for sample EDF-C1-56 SN]g4}K- FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt k>7bPR5Mw 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 }2iR=$2 a. 创建一个新的散射库 oOC&w0 b. 散射模型命名 7mf&`.C
np c. 改变散射模型为“Tabulated BSDF”. >\w]i*% d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 3
^K#\*P e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 A^#\=ZBg1 f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, /|<SD.: g. 点击OK 2ij&Db/ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 s]|tKQGl, &9|L Z9K 0{vH .b
@ 脚本代码: e([>sAx!1 9 M%Gnz '#Language "WWB-COM" Pq8oK'z- "qd|!:bE Option Explicit |cgjn*a?M K&Bbjb_| Sub Main MtaGv#mJ =J)<Nx.gA 'Cleanup C=]<R<Xy ClearOutputWindow() }z$_!)/i N5,LHO Print "Merging RPC Photonics BSDF Data Files" G"OP`OMDc SetTextColor(255,0,0) I:G8B5{J Print "Note: Script should be located in the same folder as the BSDF TXT files." @c'iT20 Print "Note: Do not run this script multiple times without deleting the output file between executions." /I!62?)-* SetTextColor(0,0,0) Bv!{V)$ I`H&b&
.` 'Current directory of this script (should be the same as the text files being merged) CbC[aVA= Dim cDir As String 2l+L96 cDir = MacroDir$ & "\" y<6c*e1 bxtH`^ 'Array which will be populated with the list of files to be merged kLF`6ZXtd Dim fList() As String, curFile As String M\a{2f7'n GetFileList( cDir, fList ) v_Sa0}K9 yF?O+9R
A Print "" PfRA\ Print "Files found for merging:" EJ#I7_ For Each curFile In fList ]& ckq Print Chr(9) & curFile mL2J Next rDhQ3iCqo ;Vs2e 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. \fiy[W/k Dim nameArray() As String, sampName As String ^4+NPk
nameArray = Split(fList(0)," 0-0.txt") U4fv$gV sampName = nameArray(0) dk
nM| Print "" J8p; 1-C" Print "Sample name: " & Chr(9) & sampName n:OXv}pv |1(x2x%}D^ 'Open an output file and write the FRED header data 'ia-h7QWS Dim outFile As String GEF's#YWK outFile = cDir & sampName & "_FRED.txt" t;6<k7h Open outFile For Output As #1 b4-gNF]Yt Print #1, "type bsdf_data" <)wLxWalF Print #1, "format angles=deg bsdf=value scale=1" `G1"&q,i @Kz,TP!%A 'Loop the file list, skip the two header lines and write the remaining data to file @n?"*B Dim lineArray() As String, curLine As Long m+;U,[%[*E For Each curFile In fList jVd`J Print "Merging data from file " & curFile *3fl}l ReadFile( cDir & curFile, lineArray ) [0y,K{8t For curLine = 2 To UBound(lineArray) Zf3(!
a[ Print #1, lineArray(curLine) *3`R W<Z Next :_6o|9J\t Next Os'E7;:1h iYgVSVNg 'Close the output file cM'MgX9 Close #1 hdx_Tduue Ja:4EU$Lu Print "Finished merging RPC data for sample " & sampName {l,&F+W$C Print "FRED formatted data file: " & Chr(9) & outFile tj~r>SRb+ End Sub rIPfO'T? jH9PD8D\ 'Utility function to read the contents of a file into an array of strings. 2|lR@L sr Function ReadFile(ByVal fileName As String, _ 2PyuM=(Wt ByRef lineArray() As String) As Long +bLP+]7oZ H`)eT6:|/ ReadFile = -1 Rf8Obk< Dim oFSO As Object En9J7es_ Set oFSO = CreateObject("Scripting.FileSystemObject") y EfAa6 Erase lineArray NMK$$0U LF!KP Dim fid As Long ~6kF`}5 If oFSO.fileexists( fileName ) Then e8("G[P> fid = FreeFile() PL&>pM Open fileName For Input As fid \Hrcf +` lineArray = Split(Input(LOF(fid), fid), vbCrLf) ,]wQ]fpt Close fid oQ
r.cKD ? End If \99'#]\_/E Set oFSO = Nothing Ebs]]a>PO Return UBound( lineArray ) xjbI1qCfe %<nGm\ End Function 2~f*o^%l hzr,
%r Sub GetFileList( ByVal in_dir As String, _ #rX^)2 ByRef in_flist() As String ) onSt%5{P%X Xydx87L/-e 'Redimension the file list array KJoa^e;~ Erase in_flist `)y
;7%- ]^>Inh! 'Tracks how many files are found W`9{RZ' Dim fCount As Long C;HEvq7 fCount = 0 6AJ`)8HX S;#:~?dU 'Recurse directory and search for text files I2CI9,0 Dim f As String YQC.jnb2 f = Dir$(in_dir & "*.txt") )yb~ kbe While f <> "" z_xy*Iif ReDim Preserve in_flist(fCount) iu=Mq|t0 in_flist(fCount) = f 5l8F.LtO\ fCount += 1 w}l^B>Zz f = Dir$() rhPv{6Z|7 Wend cQ- #] ReDim Preserve in_flist(fCount-1) 153*b^iDBh :j3'+%'2 End Sub u-iQ @4*eH\3 yOlVS@7 QQ:2987619807 )
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