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摘要: |~e"i<G# C@6:uiT$ 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。 CYLab5A ?W{+[OXs 背景: jel:oy|_ 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。 R\5,H!V9n 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。 ?a3wBy 图1. RPC Photonics工程漫射体结构及光束投射形状 Rey+3*zUb XZb=;tYo 88~Nrl=co 步骤 B`Z3e%g# Tc/^h4xH 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。 b^Z2Vf:k] ea"X$<s>- 图2. RPC Photonics工程漫射体不同类型的散射数据 xeSch?} 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 'RV96lX< 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 3e&+[j 例如下所示: `P;r[j" Sample name: EDF-C1-56 J)>DsQ+Cj Merging data from file EDF-C1-56 0-0.txt B=TUZ) Finished merging RPC data for sample EDF-C1-56 ID2->J FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt @01.Pd 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 KsP2./N a. 创建一个新的散射库 N:)x67, b. 散射模型命名 7.hBc;%2u c. 改变散射模型为“Tabulated BSDF”. UHZ&7jfl d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Q;$k?G=l 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。 J:N(U0U 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, YWK0.F,8a g. 点击OK b^$`2m-?@f 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 bW6| &P}X \Nt
5TG_ E+lR&~mK= 脚本代码: x(TF4W=j IQPu%n{0v '#Language "WWB-COM" ,Q-,#C" BA c+T Option Explicit /P*XB%y ChTq !W Sub Main "Xv} l@ .jCGtR )% 'Cleanup @KTuG ?. ClearOutputWindow() ayA;6Qt Y1-dpML Print "Merging RPC Photonics BSDF Data Files" R'k`0 SetTextColor(255,0,0) vTK%4=|1}! Print "Note: Script should be located in the same folder as the BSDF TXT files." )XDBK*! Print "Note: Do not run this script multiple times without deleting the output file between executions." =HCEUB9Fs SetTextColor(0,0,0) LL#REK|lm8 S[zvR9AW& 'Current directory of this script (should be the same as the text files being merged) teJt.VA7) Dim cDir As String }gkLO
TJ/, cDir = MacroDir$ & "\" ]o<]A[< ipwlP|UjQ5 'Array which will be populated with the list of files to be merged /*qRbN Dim fList() As String, curFile As String ,ErfTg&^ GetFileList( cDir, fList ) 1,wcf, [Arf!W-QG Print "" ='h2z"}\Bn Print "Files found for merging:" @wR3L:@ For Each curFile In fList Y)1/fEM Print Chr(9) & curFile 61S;M8tNv Next e'K~WNT 5skN'*oG 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. /TpTR-\I0 Dim nameArray() As String, sampName As String <gF]9%2E nameArray = Split(fList(0)," 0-0.txt") A9.TRKb=8 sampName = nameArray(0) 1p}H,\o Print "" 'dKfXYY1`N Print "Sample name: " & Chr(9) & sampName |T|m5V'l Z A(u"T~ 'Open an output file and write the FRED header data L
BbST! Dim outFile As String 62sl6WWS3 outFile = cDir & sampName & "_FRED.txt" (03/4*g_s Open outFile For Output As #1 [./FzlA s Print #1, "type bsdf_data" ,&_H
Print #1, "format angles=deg bsdf=value scale=1" Hh%!4_AMw J# (AX6 'Loop the file list, skip the two header lines and write the remaining data to file V'i-pn2gyu Dim lineArray() As String, curLine As Long gK rUv0&F For Each curFile In fList R(wUu#n$ Print "Merging data from file " & curFile oPKLr31zt ReadFile( cDir & curFile, lineArray ) ?8-Am[xH For curLine = 2 To UBound(lineArray) "
@D Print #1, lineArray(curLine) Y*NzY*V\ Next Tvx1+0Z%z Next ~&<#H+O *BsK6iVb 'Close the output file Zonjk%tC Close #1 x"b'Pmw <O1R*CaP Print "Finished merging RPC data for sample " & sampName $r!CQ2S Print "FRED formatted data file: " & Chr(9) & outFile |oPRP1F-;e End Sub '`2KLO>! E#J})cPzw 'Utility function to read the contents of a file into an array of strings. pQiC#4b Function ReadFile(ByVal fileName As String, _ a:cci?cb ByRef lineArray() As String) As Long bT,_=7F p[Po*c.b ReadFile = -1 @su<h\) Dim oFSO As Object iXMJ1\!q\| Set oFSO = CreateObject("Scripting.FileSystemObject") lbHgxZ Erase lineArray !l%: 8<L{\$3HP| Dim fid As Long joe)b If oFSO.fileexists( fileName ) Then b >D fid = FreeFile() Xd(^7~i Open fileName For Input As fid 3x[Cpg, lineArray = Split(Input(LOF(fid), fid), vbCrLf) I8bM-k):9R Close fid Y^+x< End If 3]*Kz*i Set oFSO = Nothing +M-tYE
5n Return UBound( lineArray ) D4L&6[W es)^^kGj6f End Function Pe_O( x%EGxs;>^ Sub GetFileList( ByVal in_dir As String, _ ^ptybVo ByRef in_flist() As String ) 4#IT" i
GLf!i1Z 'Redimension the file list array J
p?XV<3Z Erase in_flist H,(vTthd ~F,~^r!Jtu 'Tracks how many files are found c""&He4zp Dim fCount As Long >$D!mraih fCount = 0 ~Zr}QO}G S`kOtZ_N n 'Recurse directory and search for text files m'"r<]pB*4 Dim f As String Y9^l|,bm5 f = Dir$(in_dir & "*.txt") 0+CcNY9 While f <> ""
n4{%M ReDim Preserve in_flist(fCount) q/b+V)V in_flist(fCount) = f u$d[&|`>_ fCount += 1 KuP#i]Na f = Dir$() vD#U+ Wend G0
)[(s ReDim Preserve in_flist(fCount-1) a`'>VCg 1$0Kvvg[ End Sub c e;7
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