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摘要: UOb`@# +&S7l%- 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。 0si1:+t-[+ DKf(igw 背景: >@7$=Y>D 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。 f-18nF7{ 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。 x3i}IC 图1. RPC Photonics工程漫射体结构及光束投射形状 =mXC,<] 4'z)J1M u\Cf@}5( 步骤 Xf4~e(O e*Wk;D& 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。 D% j GK L2>e@p\> 图2. RPC Photonics工程漫射体不同类型的散射数据 S]fu
M% 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) $z[S0C m 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 1
tOslP@ 例如下所示: qFWN._R Sample name: EDF-C1-56 <8}FsRr;J Merging data from file EDF-C1-56 0-0.txt B>nj{W<o Finished merging RPC data for sample EDF-C1-56 t,r]22I,` FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt D^4nT,&8 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 36Lkcda[ a. 创建一个新的散射库 q;,lv3I b. 散射模型命名 G%sq;XT61 c. 改变散射模型为“Tabulated BSDF”. \2kLj2! 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 ) !'H$08Ql} e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 2VRGTx f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, u9~5U9]O%6 g. 点击OK \96\!7$@O 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 .=;IdLO,Bf ?JZ$M <yipy[D 脚本代码: (T*$4KGV &:l-;7d '#Language "WWB-COM" Y'iI_cg yMWh#[phH Option Explicit 2
`>a( ]qqgEZ1!Y Sub Main l$&~(YE f qt}M&=}8Q 'Cleanup 8;?4rrS ClearOutputWindow() +vy fhw4 $A?9U}V#^ Print "Merging RPC Photonics BSDF Data Files" GqHW.s5 SetTextColor(255,0,0) %_W4\ Print "Note: Script should be located in the same folder as the BSDF TXT files." :V.@:x>id Print "Note: Do not run this script multiple times without deleting the output file between executions." |^l_F1+w SetTextColor(0,0,0) mcQL>7ts l(NQk> w 'Current directory of this script (should be the same as the text files being merged) }O*`I( Dim cDir As String qS\#MMsTd cDir = MacroDir$ & "\" '$OUe {j< 3'.@aMA@ 'Array which will be populated with the list of files to be merged J-
S.m( Dim fList() As String, curFile As String }T4|Kyu? GetFileList( cDir, fList ) i*=~mO8E ^($'l)I Print "" ~uc7R/3ss Print "Files found for merging:" d 5yEgc;z For Each curFile In fList ZMQ=D!kT Print Chr(9) & curFile .f_
A% Next GS>[A b+ Jx5`0? 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. jn5xYKv Dim nameArray() As String, sampName As String nx'c=gp nameArray = Split(fList(0)," 0-0.txt") d[_26. sampName = nameArray(0) zzZEX Print "" gQr+~O Print "Sample name: " & Chr(9) & sampName tle`O)&uo }AS/^E 'Open an output file and write the FRED header data #Kb /tOp1 Dim outFile As String i"G'#n~e outFile = cDir & sampName & "_FRED.txt" B)Y[~4o Open outFile For Output As #1 %C_tBNE< Print #1, "type bsdf_data" R `tJ7MB Print #1, "format angles=deg bsdf=value scale=1" 2'@m'4-N ~Y x_ 3 'Loop the file list, skip the two header lines and write the remaining data to file fF)Q;~_VA Dim lineArray() As String, curLine As Long N_T5sZ\ For Each curFile In fList S-Y{Vi"2 Print "Merging data from file " & curFile T2Yf7Szp ReadFile( cDir & curFile, lineArray ) Z
i6s0Uck For curLine = 2 To UBound(lineArray) x{:U$[_ Print #1, lineArray(curLine) m,Y/ke\ Next z&gmaYwq Next FY'0?CT$ KdCrI@^ 'Close the output file K[y")ooE<j Close #1 ts~VO` tA#$q;S Print "Finished merging RPC data for sample " & sampName 8lV:-"+5 Print "FRED formatted data file: " & Chr(9) & outFile #tR:W?! End Sub Rv&"h_"t bJ_rU35s> 'Utility function to read the contents of a file into an array of strings. NwF"Zh5eMW Function ReadFile(ByVal fileName As String, _ nNCR5&,q ByRef lineArray() As String) As Long D;!sH?J@+ 2uEI@B ReadFile = -1 naaKAZ!S Dim oFSO As Object st)is4 Set oFSO = CreateObject("Scripting.FileSystemObject") iL;V5|(sb Erase lineArray j~N*T XkC yF)J7a:U Dim fid As Long |1%%c
% If oFSO.fileexists( fileName ) Then :Tpf8 fid = FreeFile() sLA.bp.O Open fileName For Input As fid %AO6= lineArray = Split(Input(LOF(fid), fid), vbCrLf) r4mh:T4i Close fid []A9j?_w End If U:*rlA@_. Set oFSO = Nothing ?r !kKMZ Return UBound( lineArray ) kx(beaf FXr^ 4B} End Function [k$GUU,jY %:~Ah6R1 Sub GetFileList( ByVal in_dir As String, _ gg`{kN^r.a ByRef in_flist() As String ) %d+Fq=< Doc zQc-U+ 'Redimension the file list array 'b.jKkW7 Erase in_flist Xgx/ubca0 q(qm3OxYo 'Tracks how many files are found W_wC"?A% Dim fCount As Long iOZ9A~Ywy fCount = 0 Kk},
PU= K.yc[z)un 'Recurse directory and search for text files *R+M#l9D` Dim f As String ={xRNNUj_ f = Dir$(in_dir & "*.txt") _-vlN While f <> "" DPf].i# ReDim Preserve in_flist(fCount) K ar! in_flist(fCount) = f %/3+:}@G fCount += 1 WuE]pm]c f = Dir$() uM$b/3%s Wend MX]#|hEeQ ReDim Preserve in_flist(fCount-1) N[Xm5J GgEg (AT End Sub <*J"6x
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