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xS=_yO9- 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。 E2^ KK:4s c3=-Mq9Q 背景: +7| [b 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。 )l`1)Ea~ 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。 9{_8cpm4 图1. RPC Photonics工程漫射体结构及光束投射形状 N]B)Fb =nJ{$%L\x, =yl4zQmg$ 步骤 }x*7l`1 u?Fnlne4@ 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。 /8f>':zUb 8';m)Jc 图2. RPC Photonics工程漫射体不同类型的散射数据 #v{ Y=$L 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) %lN2n,AK 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 /_]ltX D 例如下所示: IikG/8lP Sample name: EDF-C1-56 b6 $,Xh Merging data from file EDF-C1-56 0-0.txt ?q\FLb%"7 Finished merging RPC data for sample EDF-C1-56 3^{8_^I FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt )VNM/o%Q 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 +T9Q_e* a. 创建一个新的散射库 Vwjk[ DOL b. 散射模型命名 k/% #> c. 改变散射模型为“Tabulated BSDF”. he"L*p*H d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) q[-|ZA bbr e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 }K2
/&kZ f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, Yl$X3wi g. 点击OK 0s1'pA' 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Vzpt(_>< <"<Mbbp KacR?Al 脚本代码: Kl{-z X (B@X[~ '#Language "WWB-COM" X:>$8 ^gS z<hFK+j,'^ Option Explicit :4|M
jn AIb>pL{ Sub Main m+?N7 R,%_deV\( 'Cleanup C\7u<2c ClearOutputWindow() yf!,4SUkU 98GlhogWt Print "Merging RPC Photonics BSDF Data Files" u#1%P5r&X SetTextColor(255,0,0) Pg`JQC| Print "Note: Script should be located in the same folder as the BSDF TXT files." Ejv%,q/T( Print "Note: Do not run this script multiple times without deleting the output file between executions." ]fZ<`w8u} SetTextColor(0,0,0) t-WjL@$F/ NetYg]8` 'Current directory of this script (should be the same as the text files being merged) %`e`g ^ Dim cDir As String PY?8[A+ cDir = MacroDir$ & "\" k'Gw!p} C6|(ktt 'Array which will be populated with the list of files to be merged L7]]ZAH!1 Dim fList() As String, curFile As String $/+so;KD GetFileList( cDir, fList ) ,of]J| b^x07lO Print "" 6gnbkpYi Print "Files found for merging:" )n( Q For Each curFile In fList :$?Q D Print Chr(9) & curFile 1_uvoFLk Next L;S}s, 2x B8 H75sz 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. >"%ob,c:# Dim nameArray() As String, sampName As String VevNG* nameArray = Split(fList(0)," 0-0.txt") 'f+NW& sampName = nameArray(0) ; DDe.f" Print "" X P;Bhz3j Print "Sample name: " & Chr(9) & sampName 4 /'N|c. /_)l|<k+V 'Open an output file and write the FRED header data pISp*& Dim outFile As String 9cG<hX9`F outFile = cDir & sampName & "_FRED.txt" Lu=O+{*8 Open outFile For Output As #1 s5&=Bsv Print #1, "type bsdf_data" hJf2o Print #1, "format angles=deg bsdf=value scale=1" 9[VxskEh /aY pIMi9} 'Loop the file list, skip the two header lines and write the remaining data to file .po>qb6 Dim lineArray() As String, curLine As Long e"k/d< For Each curFile In fList <^8*<;PaG Print "Merging data from file " & curFile "$| Zr ReadFile( cDir & curFile, lineArray ) ?qmp_2:WU For curLine = 2 To UBound(lineArray) +Rwx%= Print #1, lineArray(curLine) E"qFXA> Next j+kC-U; Next kccWoU, 8]bz(P# 'Close the output file w<NyV8-hL Close #1 xq[Yg15d% D."=k{r. Print "Finished merging RPC data for sample " & sampName ~Y7dH
Dn Print "FRED formatted data file: " & Chr(9) & outFile T2=HG Z End Sub @0NJ{ fDh]tua 'Utility function to read the contents of a file into an array of strings. N|K4{Frm Function ReadFile(ByVal fileName As String, _ vWjnI*6T# ByRef lineArray() As String) As Long ,DQjDMjrf V'pqxjfd ReadFile = -1 asVX82< Dim oFSO As Object Fky?\ec Set oFSO = CreateObject("Scripting.FileSystemObject") 5M F#&v Erase lineArray ,SUT~oETP ZVih =Y-w Dim fid As Long @?kJ). If oFSO.fileexists( fileName ) Then [
MyE2^ fid = FreeFile() 8)j@aiF` Open fileName For Input As fid O
)d[8jw" lineArray = Split(Input(LOF(fid), fid), vbCrLf) FwG!> Close fid 6RoAl$}' End If `yO'[2 Set oFSO = Nothing O.QK"pKD\ Return UBound( lineArray ) r!GW=u' B^v8,;jZT End Function (xpn`NA J G$Z.s Sub GetFileList( ByVal in_dir As String, _ -ijC_`> ByRef in_flist() As String ) `yiC=$*[ KP]"P*?
? 'Redimension the file list array 9902+pW Erase in_flist Fhf<T` aZS7sV28 'Tracks how many files are found g>JLDQdc Dim fCount As Long 78 f$6J q fCount = 0 -NJ!g/ >mM jgv`>o%<W 'Recurse directory and search for text files 9=`W p6Gmn Dim f As String i)a%!1Ar f = Dir$(in_dir & "*.txt") ?)D^~/
A While f <> "" YJV% a ReDim Preserve in_flist(fCount) tc+WWDP#" in_flist(fCount) = f LeOP;#
fCount += 1 88s/Q0l f = Dir$() 49H+(*@v@ Wend 80OtO#1y ReDim Preserve in_flist(fCount-1) I:cg}JZ>| o 5U(i End Sub KqY["5p w;6bD'.>; c2nKPEX&5 QQ:2987619807 3?I;ovsM
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