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摘要: Ersr\ZB fw:7Q7
qo 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。 HC9vc,Fp lnS\5J 背景: r21?c|IP 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。 rnMG0 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。 PEX26== 图1. RPC Photonics工程漫射体结构及光束投射形状 @sB}q 6> Yn IM- S|{Yvyp 步骤 .*RB~c
t 0^<Skm27" 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。 G_2gKkIK- jpYw#]Q 图2. RPC Photonics工程漫射体不同类型的散射数据 @b::6n/u 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) -A~;MGY 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 SQdzEF 例如下所示: 5(iSOsb Sample name: EDF-C1-56 7~!I2DV_ Merging data from file EDF-C1-56 0-0.txt xVsa,EX b Finished merging RPC data for sample EDF-C1-56 dT0^-XSY FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt eHVdZ'%x 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ;1{iF2jZ: a. 创建一个新的散射库 1V*8,YiC< b. 散射模型命名 ++Rdv0~ c. 改变散射模型为“Tabulated BSDF”. vpeq:h 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 ) 'WKu0Yi^' 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。 2|0Je^$| f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, g^s+C Z g. 点击OK di]$dl|Wi 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 8~&F/C* $?]@_= _qC+'RE3 脚本代码: W; 3
R; _%A/ ) '#Language "WWB-COM" `!Ua ScM u4Y6B
]Q Option Explicit ".~MmF {Ior.(D>Y Sub Main !XgQJ7y_Z jHkyF`<+ 'Cleanup [5]R?bQ0q{ ClearOutputWindow() ?dp-}3/G w$DG=! Print "Merging RPC Photonics BSDF Data Files" Qv&T E3 SetTextColor(255,0,0) c^ixdk Print "Note: Script should be located in the same folder as the BSDF TXT files." hrJ$%U
Print "Note: Do not run this script multiple times without deleting the output file between executions." 96.IuwL*.s SetTextColor(0,0,0) _N>wzkJ [b7it2`dl 'Current directory of this script (should be the same as the text files being merged) #t"9TP Dim cDir As String /`7 I K cDir = MacroDir$ & "\" T5K-gz7A #@nZ4=/z 'Array which will be populated with the list of files to be merged L/qZ ; { Dim fList() As String, curFile As String RtW4n:c GetFileList( cDir, fList ) r :fwrC &M0o&C-1/ Print "" EsT0"{ Print "Files found for merging:" keT?,YI For Each curFile In fList 7ZF}0K$^B Print Chr(9) & curFile }U2[? Next %3]3r*e&5 Tx y]"_ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. (P2[5d| Dim nameArray() As String, sampName As String ~ GNyE*t/Y nameArray = Split(fList(0)," 0-0.txt") MB}:GY? sampName = nameArray(0) -6uH. Print "" PfVEv * Print "Sample name: " & Chr(9) & sampName w0#%AK q:xtm?'$ 'Open an output file and write the FRED header data 8lMZ Dim outFile As String Rb{+Ki outFile = cDir & sampName & "_FRED.txt" RM)1*l`!E Open outFile For Output As #1 FpP\-+Sl Print #1, "type bsdf_data" s ;48v Print #1, "format angles=deg bsdf=value scale=1" k%"$$uo '"Bex` 'Loop the file list, skip the two header lines and write the remaining data to file =ft9T&ciD Dim lineArray() As String, curLine As Long }j&O/Up For Each curFile In fList OZ eiHX! Print "Merging data from file " & curFile Bfbl#ZkyL ReadFile( cDir & curFile, lineArray ) g;$E1U=R-E For curLine = 2 To UBound(lineArray) w+Ad$4Pf" Print #1, lineArray(curLine) gs$3)t Next !.9l4@z# Next RI?NB6U J09*v)L 'Close the output file 6(:)otz Close #1 ?A|zRj{ H!p!sn Print "Finished merging RPC data for sample " & sampName Tsu\oJ[ Print "FRED formatted data file: " & Chr(9) & outFile !&Z*yH End Sub :RPVT,O} ;F|jG}M" 'Utility function to read the contents of a file into an array of strings. $Xf~# uH Function ReadFile(ByVal fileName As String, _ X )I/%{ ByRef lineArray() As String) As Long fv:L\N1u ^GN5vT+:' ReadFile = -1 wyp{KIV Dim oFSO As Object L+_8QK < Set oFSO = CreateObject("Scripting.FileSystemObject") r~I.F!{ Erase lineArray c qv.dC SzRL}}I Dim fid As Long p#)e:/Qy If oFSO.fileexists( fileName ) Then %?@x]B9Y8E fid = FreeFile() bG52s Open fileName For Input As fid Bhj:9%` lineArray = Split(Input(LOF(fid), fid), vbCrLf) 4>l0V< Close fid fH&zR#T7U4 End If 2ed@HJu Set oFSO = Nothing ;.\g-`jb Return UBound( lineArray ) ACgt"
M.3F r|M'TA~: End Function 9-B@GFB;8 k@7kNMl Sub GetFileList( ByVal in_dir As String, _ ehU"*9 ByRef in_flist() As String ) ZHz^S)o\[s YRXK@'[= 'Redimension the file list array vnDmFqelz Erase in_flist Q^nG0<q+ iL+y(] 'Tracks how many files are found qv.n9 9?] Dim fCount As Long +9TV:T fCount = 0 g083J}08 OqtQA#uL 'Recurse directory and search for text files So?m?,!W Dim f As String 70{RDj6{ f = Dir$(in_dir & "*.txt") 3zbXAR* While f <> "" TWtC-wI; ReDim Preserve in_flist(fCount) -E:(w<]; in_flist(fCount) = f -7&?@M,u fCount += 1 <H!O:Mf_p f = Dir$() -gB{:UYi3 Wend f0OgK<.>T ReDim Preserve in_flist(fCount-1) ,|A{!j` SGQDro=l End Sub wBLsz/
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