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摘要: /o|@]SAe. "r"Y9KODm 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。 ny=CtU!z 1Eg}qU,: 背景: U Ciq'^, 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。 .mok.f<G_m 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。 MH !CzV& 图1. RPC Photonics工程漫射体结构及光束投射形状 3Ji,n;QLm 6eS#L2 1* B1LnuB% 步骤 qbP[ 9 HvTi^Fb\a 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。 ,%KB\;1mn' '|]zBpz 图2. RPC Photonics工程漫射体不同类型的散射数据 %djx0sy 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) H<NYm#a" 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 %<
W1y 例如下所示: .Zwn{SMtu Sample name: EDF-C1-56 zZf#E@=$| Merging data from file EDF-C1-56 0-0.txt x &9I2" Finished merging RPC data for sample EDF-C1-56 ;bAy7 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Y^6=_^ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 5X`.2q=d a. 创建一个新的散射库 D6ck1pxkx b. 散射模型命名 zM@iG]?kc c. 改变散射模型为“Tabulated BSDF”. =} vG| 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 ) 4uu*&B 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。 B'
:ZX-Q) 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, hG
]j m g. 点击OK -Z;:_"&9 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 W:) M}}&H Ko%rB+d [j![R 脚本代码: aoJ&< vl3 qy-BZ%3 '#Language "WWB-COM" [0~qs|27 1:&$0jU&U Option Explicit :ZzG5[o3 d9^=#ot Sub Main GB
!3Z bu hxC5i% 'Cleanup 7P \sn< ClearOutputWindow() {==Q6BG* _n_i*p
'2 Print "Merging RPC Photonics BSDF Data Files" qh&K{r*T SetTextColor(255,0,0) ~cZ1=,P Print "Note: Script should be located in the same folder as the BSDF TXT files." J`x9XWYw Print "Note: Do not run this script multiple times without deleting the output file between executions." FCP5EN SetTextColor(0,0,0) m#S ZI} ,%jJ
,G, 'Current directory of this script (should be the same as the text files being merged) 6XG+YIG6w Dim cDir As String 3{_+dE"9 cDir = MacroDir$ & "\" t)m4"p7 ?_^9e 'Array which will be populated with the list of files to be merged J`V6zGgW Dim fList() As String, curFile As String V2y[IeSQ GetFileList( cDir, fList ) DMf9wB Bo0y"W[+ Print "" K{iayg!k Print "Files found for merging:" zeua`jQ For Each curFile In fList -Kc-eU-&q Print Chr(9) & curFile *o>E{ Next h]=chz z^b\hR 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. FE5R
^W#u- Dim nameArray() As String, sampName As String b,@:eVQ7 nameArray = Split(fList(0)," 0-0.txt")
o _CVZ sampName = nameArray(0) e-s@@k
Print "" "ulaF+ Print "Sample name: " & Chr(9) & sampName Hc+<(g m:^@AR1%d 'Open an output file and write the FRED header data IR>Kka(B Dim outFile As String TcIUo!:z outFile = cDir & sampName & "_FRED.txt" _<~05Eh Open outFile For Output As #1 !uZ+r% Print #1, "type bsdf_data" 8jZYy! Print #1, "format angles=deg bsdf=value scale=1" J)-owu; Z/I!\ 'Loop the file list, skip the two header lines and write the remaining data to file U-k;kmaj Dim lineArray() As String, curLine As Long B8nXWi For Each curFile In fList 4R0_%x6vG Print "Merging data from file " & curFile p!691LI ReadFile( cDir & curFile, lineArray ) pQ/:*cd+M For curLine = 2 To UBound(lineArray) ENmo^O#,u Print #1, lineArray(curLine) *[U:'o`67 Next nJ? C 4\#3 Next G]S E
A PU>;4l 'Close the output file m=K XMX Close #1 >}I}9y+ 3}+/\:q* Print "Finished merging RPC data for sample " & sampName H z6H,h Print "FRED formatted data file: " & Chr(9) & outFile jn7}jWA End Sub /}VQzF i" )_M|
'Utility function to read the contents of a file into an array of strings. J8%|Gd0#4 Function ReadFile(ByVal fileName As String, _ nqH^%/7)A@ ByRef lineArray() As String) As Long EW!$D Brl6r8LGi ReadFile = -1 5[3hw4 Dim oFSO As Object Zu$f[U)X Set oFSO = CreateObject("Scripting.FileSystemObject") Dux`BKl Erase lineArray ]`NbNr]K f4_\F/ Dim fid As Long ?yz%r`;r If oFSO.fileexists( fileName ) Then 7Y)wu$!7} fid = FreeFile() ceOjuzY Open fileName For Input As fid RpXQi*c0 lineArray = Split(Input(LOF(fid), fid), vbCrLf) q!,do2T Close fid <r kW4 End If </%H 'V@ Set oFSO = Nothing X+3)DE\2 Return UBound( lineArray ) $i1A470C lVFX@I =pI End Function y((_V%F} d5%*^nMpY Sub GetFileList( ByVal in_dir As String, _ /;0>*ft4 ByRef in_flist() As String ) {aL$vgYT1 =6dKC_Q 'Redimension the file list array <Z;7=k Erase in_flist G225Nz;Y* KH7]`CU 'Tracks how many files are found |:?.-tq Dim fCount As Long <7 rK fCount = 0 GlZ9k-ZRF ~Qsj)9 'Recurse directory and search for text files lEDHx[q Dim f As String Dmi;# WY f = Dir$(in_dir & "*.txt") %(Ys-GeGr While f <> "" F:g{rm[ ReDim Preserve in_flist(fCount) s`J=:>9* in_flist(fCount) = f &>jkfG fCount += 1 AN>`M?EQ f = Dir$() L1xD$wl Wend CJOl|"UyJ ReDim Preserve in_flist(fCount-1) {XX Nl)% ##@#:B End Sub (0Qq rNs
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