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摘要: +S[3HX7H ekU%^R< 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。 g<,0kl2'S #HW<@E 背景: ez.a 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。 8ZqLGa] 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。 O|)b$H_ 图1. RPC Photonics工程漫射体结构及光束投射形状 RgL>0s MB $aN': u`.)O2)xU 步骤 k3nvML,bv eO(U):C2 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。 T:zM]%Xh $IjI{% 图2. RPC Photonics工程漫射体不同类型的散射数据 erbk( 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)
Gk/cP` 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 yP>025o't 例如下所示: 8D,*_p Sample name: EDF-C1-56 ,|}mo+rb- Merging data from file EDF-C1-56 0-0.txt !lo
/L Finished merging RPC data for sample EDF-C1-56 {7c'%e FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^Y+Lf]zz* 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 X{Hh^H a. 创建一个新的散射库 M8<Vd1-5 b. 散射模型命名 _H@ATut c. 改变散射模型为“Tabulated BSDF”. 5ya^k{`+ZO 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 ) |2@*?o"ll 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。 AO]cnhC 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, OXbShA&1 g. 点击OK @ \XeRx; 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 DcdEt=\)h hV0fkQ.| 3+s$K(% I 脚本代码: V $w
lOMp 'L-DMNxBr '#Language "WWB-COM" QkW'tU\^ Y&8,f|{R Option Explicit 3
V>$H\H rF"p7 Sub Main qP<D9k> 4oueLT(zc 'Cleanup gGUKB2) ClearOutputWindow() >5:O%zQ@ $7c,<= Print "Merging RPC Photonics BSDF Data Files" !|i #g$ SetTextColor(255,0,0) q~[sKAh Print "Note: Script should be located in the same folder as the BSDF TXT files." ~IjID Print "Note: Do not run this script multiple times without deleting the output file between executions." \`xlD&F@U SetTextColor(0,0,0) b=_k)h+l F.5fasdX'
'Current directory of this script (should be the same as the text files being merged) DyiJ4m}kh Dim cDir As String F]UH\1 cDir = MacroDir$ & "\" Q= fl!>P xk%
62W 'Array which will be populated with the list of files to be merged )%MC*Z:^ Dim fList() As String, curFile As String Y$\|rD^f GetFileList( cDir, fList ) ;l0dx$w 0
}od Q# Print "" ],S {?!'1 Print "Files found for merging:" I4?oBq For Each curFile In fList 0V(}Zj> Print Chr(9) & curFile ?z&%VU" Next _UPfqC ? ~"#HHaBO# 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ;%^=V# Dim nameArray() As String, sampName As String LlO8]b!P-^ nameArray = Split(fList(0)," 0-0.txt") vQK/xg sampName = nameArray(0) ]lBCK Print "" 0FI
|7 Print "Sample name: " & Chr(9) & sampName [i ~qVn2vT
Pap6JR{7 'Open an output file and write the FRED header data h )5S4) Dim outFile As String (H !iK,R outFile = cDir & sampName & "_FRED.txt" ,:A;4 Open outFile For Output As #1 ">z3i`#C' Print #1, "type bsdf_data" N\ ! Print #1, "format angles=deg bsdf=value scale=1" ChG7>4:\ p\ ;|Z+0= 'Loop the file list, skip the two header lines and write the remaining data to file CL4N/[UM Dim lineArray() As String, curLine As Long %}VH5s9\ For Each curFile In fList p ZTrh&I] Print "Merging data from file " & curFile s) shq3O ReadFile( cDir & curFile, lineArray ) aYb97}kI For curLine = 2 To UBound(lineArray) ;ISnI Print #1, lineArray(curLine) 3yKmuu! Next Tgr,1)T Next 2icQ (H; U\tx{CsSz 'Close the output file 0zB[seyE Close #1 O.( 2 tj[E!
Print "Finished merging RPC data for sample " & sampName r.\L@Y< Print "FRED formatted data file: " & Chr(9) & outFile V)>?[ End Sub ngl +`|u @i; )`k5b 'Utility function to read the contents of a file into an array of strings. uwSSrT Function ReadFile(ByVal fileName As String, _ z m$Sw0#( ByRef lineArray() As String) As Long ^F+7<$2 lt&(S) ReadFile = -1 P$#: $U@ Dim oFSO As Object kY~4AH Set oFSO = CreateObject("Scripting.FileSystemObject") yEI@^8]s Erase lineArray Ct w <-' ,dCEy+ Dim fid As Long i#`q<+/q If oFSO.fileexists( fileName ) Then Oti*"dV\:: fid = FreeFile() Zob/H+] Open fileName For Input As fid sjg`4^!wDD lineArray = Split(Input(LOF(fid), fid), vbCrLf) *kl :/# Close fid _Ns EeKU End If !{t|z=Qg Set oFSO = Nothing Ey|_e3Lf[ Return UBound( lineArray ) f|~ {j(.v 7PX`kI End Function 3uqhYT; d}h{#va* Sub GetFileList( ByVal in_dir As String, _ =Nxkr0])! ByRef in_flist() As String ) QS&B"7;g *{DTxEy 'Redimension the file list array 0+* NHiH Erase in_flist
>Q\Kc=Q| TQF+aP8[L 'Tracks how many files are found EJ9hgE Dim fCount As Long zXn-E fCount = 0 :x*)o+ l[38cF 'Recurse directory and search for text files ,KW
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6 Dim f As String |h\7Q1,1~2 f = Dir$(in_dir & "*.txt") S'jg#*$ While f <> "" [8i)/5D4 ReDim Preserve in_flist(fCount) `x9Eo4(/ in_flist(fCount) = f E[]5Od5# fCount += 1 #hZ$;1. f = Dir$() _{K mj,q Wend E+]9!fDy< ReDim Preserve in_flist(fCount-1) kt/,& oKI J~k9jeq9 End Sub l<`>
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