j^Qk\(^#IV 摘要: R/B/|x 7"eIZ 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。 kSJ;kz,_ 8%; .H- 背景: dqU)(T=C 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。 U/HF6=Wot 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。图1. RPC Photonics工程漫射体结构及光束投射形状 pi;fu 1*#hIuoj' Vl(id_~ _ nJgN2Z 步骤 '&|%^9O/" Rc@lGq9 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。 L`:V]p 图2. RPC Photonics工程漫射体不同类型的散射数据 o{2B^@+Vb :[PA .Upi 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) HWL? doM 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 K^/.v<w 例如下所示: 2c,w
4rK Sample name: EDF-C1-56 P$O@G$n Merging data from file EDF-C1-56 0-0.txt MD0d Finished merging RPC data for sample EDF-C1-56 bLggh]Fh FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ~T._v;IT 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 iF:NDqc a. 创建一个新的散射库 E9.1~
) b. 散射模型命名 PJKxh%J c. 改变散射模型为“Tabulated BSDF”. 0|\JbM 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 ) sBxCi~ 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。 C3<_0eI 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, O" [#g g. 点击OK H]dN'c- 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 je:J`4k$ Py9:(fdS $0M7P5]N*G 脚本代码: tQMz1$ *MWI`=c '#Language "WWB-COM" Tz(Dhb, ]VN1Y) Option Explicit $reQdN=~ TYxi&;w Sub Main N9H qFp t/]za4w/ 'Cleanup nrTCq~LO( ClearOutputWindow() +b dnTV6 ~4 S6c=: Print "Merging RPC Photonics BSDF Data Files" 5B{Eg? SetTextColor(255,0,0) xLbF9ASim Print "Note: Script should be located in the same folder as the BSDF TXT files." AUU(fy#< Print "Note: Do not run this script multiple times without deleting the output file between executions." %CrpUx SetTextColor(0,0,0) _2})URU<S Pi[(xD8 'Current directory of this script (should be the same as the text files being merged) kgX"I ?>d Dim cDir As String :r_/mzR# cDir = MacroDir$ & "\" [}l
1`> 0w$1Yx~C 'Array which will be populated with the list of files to be merged *u34~v16, Dim fList() As String, curFile As String k~1{|HxrE GetFileList( cDir, fList ) i?F~]8 m`,h nDp Print "" xAf?E%_pi Print "Files found for merging:" ;p(Doy)i For Each curFile In fList i+Xb3+R Print Chr(9) & curFile _lOyT$DN Next {f>e~o
Eo{js?1G_ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. WZ@$bf}f0 Dim nameArray() As String, sampName As String n*qn8Dq nameArray = Split(fList(0)," 0-0.txt") G7HvA46 sampName = nameArray(0) 38RyUHL= Print "" XCO;t_% Print "Sample name: " & Chr(9) & sampName VC NQ}h[D 74~%4 'Open an output file and write the FRED header data ,Ct1)%
Dim outFile As String wIQt
f|ZI> outFile = cDir & sampName & "_FRED.txt" .ffb*gZ4 Open outFile For Output As #1 PkdL] !: Print #1, "type bsdf_data" W'C~{}c= Print #1, "format angles=deg bsdf=value scale=1" <(o) * Zmo 0 !F!Y_ 'Loop the file list, skip the two header lines and write the remaining data to file 9C1\?)"D^e Dim lineArray() As String, curLine As Long S?(/~Vb% For Each curFile In fList H[iR8<rhQ Print "Merging data from file " & curFile !o`h*G-x ReadFile( cDir & curFile, lineArray ) k`,>52 For curLine = 2 To UBound(lineArray) NFb<fD[C Print #1, lineArray(curLine) I6 Q{ Axy Next &o)eRcwH` Next Y X{F$BM 09HqiROw 'Close the output file ~$ "P\iJ Close #1 bX&=*L+h6 1:q5h* Print "Finished merging RPC data for sample " & sampName 7brC@+ZD Print "FRED formatted data file: " & Chr(9) & outFile (,
uW- End Sub n]WVT@ nTPq|=C 'Utility function to read the contents of a file into an array of strings. s\
YHT.O? Function ReadFile(ByVal fileName As String, _ iXuSFman ByRef lineArray() As String) As Long Fpy-?U ;[[oZ ReadFile = -1 agPTY{; Dim oFSO As Object 4Y}{?]>pu Set oFSO = CreateObject("Scripting.FileSystemObject") 4#wZ#} Erase lineArray
i(n BXV{ B["C~aF Dim fid As Long ]9NA3U7F If oFSO.fileexists( fileName ) Then kTs.ps8ei fid = FreeFile() &^^V*O Open fileName For Input As fid :PDyc(s{ lineArray = Split(Input(LOF(fid), fid), vbCrLf) wy4}CG
Close fid J0x)NnWJ End If 3g5
n>8- Set oFSO = Nothing VPXUy=W Return UBound( lineArray )
i}r|Zo @ZGD'+zd? End Function o",J{ ps3jw*QZ{5 Sub GetFileList( ByVal in_dir As String, _ 6Y&`mgMF' ByRef in_flist() As String ) Lk1e{!a z[0B"f 'Redimension the file list array 4jdP3Q/ Erase in_flist ,ftKRq ~-o[v-\ 'Tracks how many files are found K)F6TvWv Dim fCount As Long %*Lv fCount = 0 xh9Os < QL`Hb p 'Recurse directory and search for text files *t,1(Gw|7q Dim f As String 4
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f = Dir$(in_dir & "*.txt") >K-S&Y While f <> "" 6k*,Yei ReDim Preserve in_flist(fCount) x3Ze\N8w in_flist(fCount) = f d\v1R-V fCount += 1 #8qhl f = Dir$() )>U7+ Me Wend |kh7F0';" ReDim Preserve in_flist(fCount-1) |