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摘要: 1<UQJw45 xl$ Qw' 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。 J^cDa|j Heu@{t.[!D 背景: 4j5 "{ 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。 7_,X9^z 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。 eNX-2S 图1. RPC Photonics工程漫射体结构及光束投射形状 !RI&FcK $}@ll^ S6
*dp68 步骤 Rx.0P6s 6gXc-}dp 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 ]M/w];: ;uy/Vc5,Y 图2. RPC Photonics工程漫射体不同类型的散射数据 l3,|r QD 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) DWG}}vN:& 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 4kiu*T 例如下所示: rcOmpgew Sample name: EDF-C1-56 I5mS!m/X Merging data from file EDF-C1-56 0-0.txt tx.sUu6 Finished merging RPC data for sample EDF-C1-56 Ue7~rPdlR FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt pH%K4bV)8 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 N*#SY$!y a. 创建一个新的散射库 i \~4W$4I b. 散射模型命名 827N?pU$) c. 改变散射模型为“Tabulated BSDF”. _F9
c.BH 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 ) :
SNp"| 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。 z3,z&Ra 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, 4{V=X3,x g. 点击OK /dAIg1ra 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 @({65 gJ* chy7hPxC; DIY WFVh 脚本代码: > 01k
u hn-S$3')` '#Language "WWB-COM" :3k(=^%G! Lqt] Option Explicit kF?\p`[a AbB%osz}Ed Sub Main /CP1mn6H .3[YOM7h 'Cleanup F n\)*; ^ ClearOutputWindow() u}$?r\H'( B*{CcQ<5 Print "Merging RPC Photonics BSDF Data Files" +Fk.B@KT, SetTextColor(255,0,0) 6gv.n Print "Note: Script should be located in the same folder as the BSDF TXT files." F=cO=5Iz Print "Note: Do not run this script multiple times without deleting the output file between executions." 6i%)'dl SetTextColor(0,0,0) Kxg09\5i Gh j[nsoC~ 'Current directory of this script (should be the same as the text files being merged) P_9O8"W Dim cDir As String 'uh6?2)wG cDir = MacroDir$ & "\" 1.+MX(w qVf~\H@ 'Array which will be populated with the list of files to be merged #8'%CUF*<8 Dim fList() As String, curFile As String a 3HS!/ GetFileList( cDir, fList ) B|8(}Ciqx J4<- C\=4 Print "" b[$>HB_Na Print "Files found for merging:" h'
16"j> For Each curFile In fList KjLj Print Chr(9) & curFile "ey~w=B$M Next IgVxWh# #/n\C 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Cu}Rq!9i Dim nameArray() As String, sampName As String M$w^g8F27H nameArray = Split(fList(0)," 0-0.txt") 8g<3J-7Mm sampName = nameArray(0) RAe:$Iv$!v Print "" ,+2ytN* Print "Sample name: " & Chr(9) & sampName Lm8cY ^uYxeQY[ 'Open an output file and write the FRED header data bH&[O`vf Dim outFile As String >8ePx,+! outFile = cDir & sampName & "_FRED.txt" hNQ,U{`;^ Open outFile For Output As #1 oYu5]ry Print #1, "type bsdf_data" b.$Gc!g Print #1, "format angles=deg bsdf=value scale=1" MVV<&jho{^ Fd2zvi 'Loop the file list, skip the two header lines and write the remaining data to file xD1w#FMlQs Dim lineArray() As String, curLine As Long u ;I5n For Each curFile In fList &D/_@\ 0 Print "Merging data from file " & curFile hd\iW7 ReadFile( cDir & curFile, lineArray ) vQA: \! For curLine = 2 To UBound(lineArray) )4j#gHN\ Print #1, lineArray(curLine) mI}'8. Next WO]dWO6Mm Next $AoN,B> k*M1m'1 'Close the output file gCd9"n-e Close #1 GMFp,Df y>|7'M*+ Print "Finished merging RPC data for sample " & sampName TzVNZDQ`Jl Print "FRED formatted data file: " & Chr(9) & outFile ndN8eh:OR End Sub UeE&rA] JI(8{ f 'Utility function to read the contents of a file into an array of strings. zL1H[}[z+ Function ReadFile(ByVal fileName As String, _ f ^z7K ByRef lineArray() As String) As Long O0wD"V^W (G:$/fK ReadFile = -1 yt$V<8a Dim oFSO As Object kpEES{f Set oFSO = CreateObject("Scripting.FileSystemObject") Aj-}G^># Erase lineArray X=-pNwO \3x,)~m Dim fid As Long +,If|5>( If oFSO.fileexists( fileName ) Then 'H:lR1(, fid = FreeFile() Z?X
^7< Open fileName For Input As fid wOINcEdx lineArray = Split(Input(LOF(fid), fid), vbCrLf) K" Y,K Close fid xj(&EGY: End If &%rXRP Set oFSO = Nothing +\SbrB P Return UBound( lineArray ) T5o9pmD (Zx;GS End Function 6dV92: qd"*Td Sub GetFileList( ByVal in_dir As String, _ cvi+AZ= ByRef in_flist() As String ) |0BmEF pz~AsF 'Redimension the file list array Qr$uFh/y Erase in_flist HX?5O$<<N H"6:!;9, 'Tracks how many files are found 3%>"|Ye}A Dim fCount As Long 76(&O fCount = 0 yin"+&<T Fod2KS;g 'Recurse directory and search for text files ]Ocf %( Dim f As String <5G*#0gw f = Dir$(in_dir & "*.txt") @zW'!Ol While f <> "" n"$D/XJO ReDim Preserve in_flist(fCount) ,@8>=rT in_flist(fCount) = f f?[IwA` fCount += 1 ZmU S} f = Dir$() 9["yL{IPe Wend E XEae? ReDim Preserve in_flist(fCount-1) {])F%Q_#cD Q];+?Pu. End Sub aa8WRf
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