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摘要: R43yr+p L~,x~sLd 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。 +8rGStv "-pQL )f 背景: jmDQKqEc|l 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。 3Pj 6(cf 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。 W[dK{?RB 图1. RPC Photonics工程漫射体结构及光束投射形状 s Y^#I &at^~o =lE_
Q[P 步骤 ZW6ZO[`6 &Ow[ 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。 (4hCT* #LGAvFA*_F 图2. RPC Photonics工程漫射体不同类型的散射数据 e~NEyS~3 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) O,&nCxB] 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 Y"x9B%e 例如下所示: Z|8oD*, Sample name: EDF-C1-56 wVSk.OOB Merging data from file EDF-C1-56 0-0.txt N,iYUM? Finished merging RPC data for sample EDF-C1-56 u@;6r"8q FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt .d^XM 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 +zU[rhMk' a. 创建一个新的散射库 : J3_g<@ b. 散射模型命名 P)>`^wc$ c. 改变散射模型为“Tabulated BSDF”. l(o#N'!j4 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 ) sS 5aJ}Qs 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。 G,VTFM6 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, Qx
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{ g. 点击OK ?k5m1,fHW 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 IfeCSK,x &2~c,] 9C HF2w?: 脚本代码: Rh[%UNl Zj(2$9IU '#Language "WWB-COM" !9 B` X9J&OQ[W Option Explicit #- l1(m 7S
+YQ$_ Sub Main w^_[(9
` Z{9
mZlIy 'Cleanup f1hjU~nJ ClearOutputWindow() [&tN(K9* z'FpP Print "Merging RPC Photonics BSDF Data Files" aBBTcN%' SetTextColor(255,0,0) TVk C pO,H Print "Note: Script should be located in the same folder as the BSDF TXT files." Uz;z Print "Note: Do not run this script multiple times without deleting the output file between executions." bJ~@
k,' SetTextColor(0,0,0) _(qU%B 4RLuv?,)~ 'Current directory of this script (should be the same as the text files being merged) 6X2~30pdE Dim cDir As String 'b?Px} cDir = MacroDir$ & "\" h{J=Rq ,#NH]T`c1 'Array which will be populated with the list of files to be merged 0R#T 3K} Dim fList() As String, curFile As String c"|4'#S GetFileList( cDir, fList ) ai3wSUYJi 9r5<A!1#L Print "" d0b`qk @4 Print "Files found for merging:" Vy-kogVt For Each curFile In fList jm~qD
T, Print Chr(9) & curFile uxxS."~ Next rZ|!y ~S| )kBN]>&R 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. l"C)Ia&/ Dim nameArray() As String, sampName As String ;Q1/53Y< nameArray = Split(fList(0)," 0-0.txt") A6 D@#(D sampName = nameArray(0) /^m3?q[a Print "" YH:murJMZ Print "Sample name: " & Chr(9) & sampName 'Q^P#<< X-Yy1"6m1 'Open an output file and write the FRED header data e>OYJd0s Dim outFile As String _&U5 u outFile = cDir & sampName & "_FRED.txt" g[#4`Q<. Open outFile For Output As #1 fsA-}Qc Print #1, "type bsdf_data" XOdkfmc+s' Print #1, "format angles=deg bsdf=value scale=1" c`F~vrr)X ^Hdru]A$2 'Loop the file list, skip the two header lines and write the remaining data to file ZRK1UpP Dim lineArray() As String, curLine As Long H.n+CR For Each curFile In fList _#kjiJj* Print "Merging data from file " & curFile MFHc>O
DA ReadFile( cDir & curFile, lineArray ) ?HsQ417.H For curLine = 2 To UBound(lineArray) qv+8wJ(( Print #1, lineArray(curLine) hj8S".A_ Next l6AG!8H Next !%1=|PX_ Q9[$8 'Close the output file GC<zL} Close #1 U#7moS'r 1]yjhw9g Print "Finished merging RPC data for sample " & sampName 3RW3<n Print "FRED formatted data file: " & Chr(9) & outFile :epjJ1mW End Sub ftw@ nQNU XW^Sw;[efZ 'Utility function to read the contents of a file into an array of strings. x+X^K_* Function ReadFile(ByVal fileName As String, _ ",pN.<F9O ByRef lineArray() As String) As Long `X =2Ff `akbzHOM ReadFile = -1 3hPj;-u Dim oFSO As Object AzfYw'^&9 Set oFSO = CreateObject("Scripting.FileSystemObject") $PNS`@B Erase lineArray y5v}EX`m& opQdym Dim fid As Long >_<J=8|E If oFSO.fileexists( fileName ) Then oD0N<Ln} fid = FreeFile() =`
%iv|>r0 Open fileName For Input As fid f:).wi
Ld lineArray = Split(Input(LOF(fid), fid), vbCrLf) #Is/j = Close fid ]t23qA@^2 End If [^J2<\<0 Set oFSO = Nothing 2f=7`1RCD Return UBound( lineArray ) DM73
Nn^5 OFyZY@B-C~ End Function E2
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N01<"\ Sub GetFileList( ByVal in_dir As String, _ fFBD5q(n ByRef in_flist() As String ) =Y0>b4 >`@c9
m 'Redimension the file list array S]P80|!| Erase in_flist VgoN=S 6z (eW]p 'Tracks how many files are found 3=SN;cn Dim fCount As Long X`,]@c%C` fCount = 0 x;G~c5 '%D$|) 'Recurse directory and search for text files ]Q%|69H}B Dim f As String UB4 M=R| f = Dir$(in_dir & "*.txt") T9c=As_EM While f <> "" 9 aE.jpN ReDim Preserve in_flist(fCount) LMV0:\> in_flist(fCount) = f t]j4PNzn fCount += 1 WC?}a^
8 f = Dir$() +Yuy%VT Wend |<YoH$. ReDim Preserve in_flist(fCount-1) q*h1=H52 Gm]]Z_ End Sub vbZGs7%
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