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摘要: 9,4Lb] Uo!#p'<w)p 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。 FM)Es&p& /NH9$u.g 背景: &3Q!'pJJ Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 'ow`ej FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 8%dE$smH 图1. RPC Photonics工程漫射体结构及光束投射形状 Tw!]N%E wIv_Z^%V )L*6xTa~ 步骤 {p{TG5rwX |-W7n'n 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。 lm?1 K:+[ S+d@RMdes 图2. RPC Photonics工程漫射体不同类型的散射数据 _\9|acFT2O 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) uz(3ml^S 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 rHir>
p 例如下所示: ]ZQ3|ZJ?< Sample name: EDF-C1-56 b>B.3E\Pc Merging data from file EDF-C1-56 0-0.txt ^=H. .pr Finished merging RPC data for sample EDF-C1-56 ~JJuM FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt |6%B2I&c 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 kIb)I(n a. 创建一个新的散射库 )}-,4Iu% b. 散射模型命名 h@5mVTb}i c. 改变散射模型为“Tabulated BSDF”. t(O{IUYM 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 ) *nv%~t 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。 .#M' 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, s)=fs#% g. 点击OK I.f)rMl+h
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 k* ayzg3F> =@ '>|-w| wF +9Iu 脚本代码: FCC9Ht8U? X}~5%B( '#Language "WWB-COM" Z'P>sV DS@ZE Q`F Option Explicit ZeUA e \GL!x 7s1A Sub Main ,cbCt `CWI%V 'Cleanup %_rdO(
ClearOutputWindow() h&$7^P dE<}X7J% Print "Merging RPC Photonics BSDF Data Files" ^
|k7g SetTextColor(255,0,0) X=i^[?C Print "Note: Script should be located in the same folder as the BSDF TXT files." )T-C/ 3 Print "Note: Do not run this script multiple times without deleting the output file between executions." 2yu\fu SetTextColor(0,0,0) :x36^{7 Xknp*(9 'Current directory of this script (should be the same as the text files being merged) uM!$`JN Dim cDir As String i8F^ N= cDir = MacroDir$ & "\" VJK?"mX K3uNR w 'Array which will be populated with the list of files to be merged P}] xz Vy Dim fList() As String, curFile As String J}Q4.1WG$ GetFileList( cDir, fList ) I7b_dJD;* h]wahExYP Print "" HLL[r0P`F Print "Files found for merging:" pvCf4pf~ For Each curFile In fList Md~%
e' Print Chr(9) & curFile b51{sL Next :[;]6; cQ= "3M)~r 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. g"Eg=CU Dim nameArray() As String, sampName As String v8
Q/DJ~ nameArray = Split(fList(0)," 0-0.txt") k<1BE^[V sampName = nameArray(0) 0q|.]:][Eo Print "" _0~WT Print "Sample name: " & Chr(9) & sampName
X2X.&^ IO,ddVO 'Open an output file and write the FRED header data {s=n "*Qp) Dim outFile As String o5!"dxR outFile = cDir & sampName & "_FRED.txt" 5Ocd2T' Open outFile For Output As #1 v9<7= D&x Print #1, "type bsdf_data" Y<~Nx~w{ Print #1, "format angles=deg bsdf=value scale=1" j"FX ?|4 q|*}>=NX 'Loop the file list, skip the two header lines and write the remaining data to file 8Iz-YG~%3 Dim lineArray() As String, curLine As Long t<_Jx<{2 For Each curFile In fList .~)[> Print "Merging data from file " & curFile K"p$ga{ ReadFile( cDir & curFile, lineArray ) f.V1 For curLine = 2 To UBound(lineArray) >(v%"04|e Print #1, lineArray(curLine) ']nB_x7 Next G#V}9l8Q Next 4'&j<Ah[# ]_cBd)3P} 'Close the output file x"hZOgFZ Close #1 I6bekOvP G~,K$z/-l Print "Finished merging RPC data for sample " & sampName 2h<{~; Print "FRED formatted data file: " & Chr(9) & outFile deD%E-Ja End Sub $
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@ 'Utility function to read the contents of a file into an array of strings. q3+G Function ReadFile(ByVal fileName As String, _ nZ;h&N-_- ByRef lineArray() As String) As Long Yzr RnVr tBDaFB ReadFile = -1 z^+`S: Dim oFSO As Object /u9Md 3q*' Set oFSO = CreateObject("Scripting.FileSystemObject") x/nlIoT Erase lineArray MQL1 />j; l2v4SvbX Dim fid As Long zzf;3S? If oFSO.fileexists( fileName ) Then %bM^/7 fid = FreeFile() 3t Open fileName For Input As fid ("2ukHc lineArray = Split(Input(LOF(fid), fid), vbCrLf) r 5!ie!5gE Close fid yo)a_rY End If ~ vD7BO` Set oFSO = Nothing 44H#8kV Return UBound( lineArray ) Qr`WPTQr" !Vtt.j &4 End Function [emUyF vn n4 Sub GetFileList( ByVal in_dir As String, _ &^ECQ ByRef in_flist() As String ) g~ tG K6#9HF'2I 'Redimension the file list array 5):2;h k Erase in_flist %
K$om|]p wRgh`Hc\} 'Tracks how many files are found sOc<'):TK Dim fCount As Long e:9CD- fCount = 0 y %dUry%> OrXx0Hn 'Recurse directory and search for text files P;%4Imq3 Dim f As String ?Ji.bnfK f = Dir$(in_dir & "*.txt") nSH
A,c While f <> "" GarPnb ReDim Preserve in_flist(fCount) R|PFGhi6"A in_flist(fCount) = f yZf+*j/a7 fCount += 1 xrbDqA.b f = Dir$() xPa>-N=* Wend [m*=Q ReDim Preserve in_flist(fCount-1) 8'=8!V } D5* End Sub ([loWr}QR
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