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摘要: =(!&8U9 I-@A{vvPK 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。 BvXA9YQ3 zli@X Z# 背景: };rxpw>ms 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。 p i;,?p- 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。 Z/y&;N4 图1. RPC Photonics工程漫射体结构及光束投射形状 {*/&`$0lH| P>*B{fi^ a4zq`n|3U 步骤 ?*2DR:o>@ M qy5>f) 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 Gp0B^^H$ 8M{-RlR 图2. RPC Photonics工程漫射体不同类型的散射数据 \KBE+yj 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) ^jY'Hj.Bs 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 ck=x_HB1 例如下所示: 4# pn] Sample name: EDF-C1-56 z#$>f*b Merging data from file EDF-C1-56 0-0.txt %Tc P[< Finished merging RPC data for sample EDF-C1-56 B%~hVpm,eM FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt `s0`kp 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 pN-l82]' a. 创建一个新的散射库 3ID1> b. 散射模型命名 (?9 @nS c. 改变散射模型为“Tabulated BSDF”. d&!;uzOx 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 ) br@GnjG 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。 a>3#z2# 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, 0|1)cO}Dy g. 点击OK NJ^H"FLS: 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 -r.Qy(}p L7~9u|7a# In[!g 脚本代码: \Vc-W|e
: h"Bf@3 '#Language "WWB-COM" *bi!iz5F oWJ0>) Option Explicit 9n(.v} MF7q*f Sub Main $#b@b[h<w XXx]~m 'Cleanup 7P&O{tl( ClearOutputWindow() X?2ub/Nr#Y |OgtAI9 Print "Merging RPC Photonics BSDF Data Files" ,YEwz3$5u SetTextColor(255,0,0) 5_|Sm= Print "Note: Script should be located in the same folder as the BSDF TXT files." scXY~l]I* Print "Note: Do not run this script multiple times without deleting the output file between executions." 2J>v4EWC SetTextColor(0,0,0) )D_\~n/5 anM]khs? 'Current directory of this script (should be the same as the text files being merged) td}%reH Dim cDir As String _LVi}mM cDir = MacroDir$ & "\" ,Pq@{i# 12D>~#J 'Array which will be populated with the list of files to be merged 5,i0QT" Dim fList() As String, curFile As String IB'gY0* GetFileList( cDir, fList ) E41ay:duAl iSiez' Print "" l\Q-- Print "Files found for merging:" vr:5+wew For Each curFile In fList )z:"P;b"Nl Print Chr(9) & curFile vtm?x,h Next R#K,/b%SV *bOgRM[ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. oqXs2F Dim nameArray() As String, sampName As String >Y3ZK{b nameArray = Split(fList(0)," 0-0.txt") JemB[ sampName = nameArray(0) I1J/de,u Print "" M5C%(sQ$ Print "Sample name: " & Chr(9) & sampName 53g(:eB :u
ruC 'Open an output file and write the FRED header data EG7.FjnVu Dim outFile As String @(b;H0r~ outFile = cDir & sampName & "_FRED.txt" acPX2B[jJ Open outFile For Output As #1 AA&5wDMV> Print #1, "type bsdf_data" ?y1G,0, Print #1, "format angles=deg bsdf=value scale=1" T@{}! xE0'eC5n^ 'Loop the file list, skip the two header lines and write the remaining data to file c9uln Dim lineArray() As String, curLine As Long B%L dH For Each curFile In fList (8XP7c]5 Print "Merging data from file " & curFile eHIsTL@Fp ReadFile( cDir & curFile, lineArray ) gq:2`W&5 For curLine = 2 To UBound(lineArray) ^U5g7Emf Print #1, lineArray(curLine) ?'jRUf l Next Xy[*)< Next [f8mh88r 3-%F)@n 'Close the output file Qf$3!O}G Close #1 f ^vz zCuN8 Print "Finished merging RPC data for sample " & sampName &_Vd Print "FRED formatted data file: " & Chr(9) & outFile Ok*aP+Wq End Sub u A=x~-I C7hJE- 'Utility function to read the contents of a file into an array of strings. ;oT!\$Mu Function ReadFile(ByVal fileName As String, _ 5 `Mos ByRef lineArray() As String) As Long MODi:jsl }zE
Qrfl ReadFile = -1 an<loLW Dim oFSO As Object F?3zw4Vt~ Set oFSO = CreateObject("Scripting.FileSystemObject") Ln3<r&&Jz Erase lineArray sf(2~BMQI NH$!<ffz Dim fid As Long 2Jl$/W 3 If oFSO.fileexists( fileName ) Then IT5a/;J fid = FreeFile() !^h{7NmP[ Open fileName For Input As fid k04CSzE"% lineArray = Split(Input(LOF(fid), fid), vbCrLf) @ /yQ4Gr Close fid o;^k"bo6 End If :jP4GCxU| Set oFSO = Nothing 920 o]Dh=t Return UBound( lineArray ) 'xn3g ;5 \0'0)@uziQ End Function ky^u.+cZ ymr#OP$<S Sub GetFileList( ByVal in_dir As String, _ /bBFPrW ByRef in_flist() As String ) D(YNa $,&3:ke1 'Redimension the file list array e ab_"W
Erase in_flist aplOo[ )=EJFQ*v 'Tracks how many files are found ~4t7Q Dim fCount As Long Rv^
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fCount = 0 #1#?k 9U=~t%qW$ 'Recurse directory and search for text files 6.>l Dim f As String -$0w-M8' f = Dir$(in_dir & "*.txt") _(&XqEX While f <> "" OqW (C ReDim Preserve in_flist(fCount) /OaW4 b$Tz in_flist(fCount) = f "A0J~YvYWJ fCount += 1 qE W3k), f = Dir$() )8244; Wend 7z@Jw ReDim Preserve in_flist(fCount-1) x[w!buV0\ hZ;[}5T\<S End Sub ~UhTy~jya 2uajK..b _R] qoUw; QQ:2987619807 q,->E<8
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