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摘要: WGo ryvEx xXJzE|)1h! 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。 ob/HO(h3 YVk
+zt~S 背景: \aN5:Yy 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。 waG &3m 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。 mS.!lkV 图1. RPC Photonics工程漫射体结构及光束投射形状 COd~H W k "_lJ qj^A 步骤 Y 2^y73&k j`_Z`eG 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。 Djf~8q V! a;(,$q3M 图2. RPC Photonics工程漫射体不同类型的散射数据 ^5+7D1>W% 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) ObataUxQT 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 \2Kl]G(w%y 例如下所示: yK mHTjX= Sample name: EDF-C1-56 GT3}'`f B Merging data from file EDF-C1-56 0-0.txt tq*{Hil>P` Finished merging RPC data for sample EDF-C1-56 9gZS)MZ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt .:(gg 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 VotI5O $ a. 创建一个新的散射库 buHUBn[3) b. 散射模型命名 =wa5\p/ c. 改变散射模型为“Tabulated BSDF”. Rb
<{o8 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 ) 5!6}g<z&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。 @s\}ER3 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, >_X(rar0 g. 点击OK }-vP~I 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ~\zIb/ # /#}%c' t'C9; 脚本代码: t2qWB[r 2 xi@5;! '#Language "WWB-COM" 1+-F3ROP 8
;=?Lw? Option Explicit x
o72JJ b+BX >$ Sub Main U"Z%_[* J^Wqa$<;" 'Cleanup 5zt5]zl' ClearOutputWindow() h5))D! M|>-q Print "Merging RPC Photonics BSDF Data Files" pf0uwXo SetTextColor(255,0,0) P?y{9H* Print "Note: Script should be located in the same folder as the BSDF TXT files." u#Uc6? E Print "Note: Do not run this script multiple times without deleting the output file between executions." >*}m.'u SetTextColor(0,0,0) o7g6*hJz tgu
fU 'Current directory of this script (should be the same as the text files being merged) [wJl]i Dim cDir As String TJs@V>, cDir = MacroDir$ & "\" U9R pHh` GU)NZ[e 'Array which will be populated with the list of files to be merged q,j` _
R4 Dim fList() As String, curFile As String VF9-&HuC GetFileList( cDir, fList ) |>nVp:t^ bvo
}b-]E Print "" zrur-i$N+ Print "Files found for merging:" zx5t
gZd,N For Each curFile In fList 9K{0x7~ Print Chr(9) & curFile 8V:yOq10 Next +@#-S dJZ
9mP!d 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. kC+dQ&@g{ Dim nameArray() As String, sampName As String .eDI ZX nameArray = Split(fList(0)," 0-0.txt") ]&L[] sampName = nameArray(0) [m]O^Hp{{ Print "" 7me1:}4 Print "Sample name: " & Chr(9) & sampName .fS1 q.RW_t~ 'Open an output file and write the FRED header data \"A~ks~ Dim outFile As String f@IL2DL}\ outFile = cDir & sampName & "_FRED.txt" D5
^Wi Q< Open outFile For Output As #1 ]F,v#6qi Print #1, "type bsdf_data" YZ+<+`Mz< Print #1, "format angles=deg bsdf=value scale=1" &v_b7h %:.00F([r 'Loop the file list, skip the two header lines and write the remaining data to file TM$`J Dim lineArray() As String, curLine As Long +JL"Z4b@R} For Each curFile In fList n15lX,FI Print "Merging data from file " & curFile wB0ONH[ ReadFile( cDir & curFile, lineArray ) %g%#=a;]q For curLine = 2 To UBound(lineArray) Yy8%vDdJO Print #1, lineArray(curLine) A*hc
w Next {2%@I~US Next _6Fj&mw(u YQ<O.E 'Close the output file ?gOZY\[ma Close #1 GvT'v0&+ _p=O*$b. Print "Finished merging RPC data for sample " & sampName ]#x?[F Print "FRED formatted data file: " & Chr(9) & outFile cwA+?:Ry} End Sub [z`m`9Aq m.N/g, 'Utility function to read the contents of a file into an array of strings. u-E*_%y Function ReadFile(ByVal fileName As String, _ b7bbrR8 ByRef lineArray() As String) As Long NFcMh+qnK vZpt}u ReadFile = -1 ^ $t7p
1 Dim oFSO As Object "5R8Zl+ Set oFSO = CreateObject("Scripting.FileSystemObject") `ynD-_fTN Erase lineArray /8w
_jjW n~k9Z^ $ Dim fid As Long .pQ4#AJ If oFSO.fileexists( fileName ) Then &U8W(NxN fid = FreeFile() YWPAc>uw, Open fileName For Input As fid `$D2w| lineArray = Split(Input(LOF(fid), fid), vbCrLf) 9*}?0J8 Close fid S_B;m1 End If kycZ Set oFSO = Nothing - ?W hJ.U Return UBound( lineArray ) #b4Pn`[ nAJ<@a End Function =<,AzuV fu 95-)M Sub GetFileList( ByVal in_dir As String, _ QeVM9br)m ByRef in_flist() As String ) $=GZ"%ED
D=nuK25 'Redimension the file list array vxzOG?Xc: Erase in_flist QNH5Cq;Y Yg6 f 'Tracks how many files are found EV 8}C= Dim fCount As Long v/BMzVi fCount = 0 lT3, G#( fK|F`F2V 'Recurse directory and search for text files @^$Xy<x Dim f As String *a7&v3X f = Dir$(in_dir & "*.txt") sC Fqz[I While f <> "" 3%<xM/# ReDim Preserve in_flist(fCount) 7usf^g[dh in_flist(fCount) = f `}^_> fCount += 1 <Vk^fV f = Dir$() b_]14 v Wend l1\/ ` ReDim Preserve in_flist(fCount-1) dkC[Jt OIa=$l43C End Sub }w&+H28.# L+PrV y )0P>o]fWI QQ:2987619807 i!30f^9D-S
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