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摘要: ~^V&n`*7D jT=|!,Pn 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。 C[G+SA1&W Jp_#pV*}: 背景: uT4|43<
G 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。 `vgaX,F* 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__?k Y 图1. RPC Photonics工程漫射体结构及光束投射形状 @;tfHoXD .WqqP >*8V]{f9 步骤 *>KBDFI ft6)n T/"& 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。 w CB*v<* ,M;9|kE* 图2. RPC Photonics工程漫射体不同类型的散射数据 L|T?,^ 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) e))L&s 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 9+^)?JUYll 例如下所示: .{h"0<x Sample name: EDF-C1-56 3WJk04r Merging data from file EDF-C1-56 0-0.txt n jWe^ Finished merging RPC data for sample EDF-C1-56 2CO/K_Q FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt {uaDpRt 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,UMr_ e{| a. 创建一个新的散射库 <.QaOLD b. 散射模型命名 DFK@/.V c. 改变散射模型为“Tabulated BSDF”. M`H#Qo5/ 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 ) w}>%E6UY 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。 ,Gt!nm_ 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, oQ<[`.s g. 点击OK k.ou$mIY 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 0% rDDB }}=n]_f @%Ld\8vdfJ 脚本代码: M?eP1v:<+G h#hr'3bI1 '#Language "WWB-COM" T+}|$/Tv PN
l/}' Option Explicit K=[7<b,:3 9efDM Sub Main {5E8eQ #cfiN b}GX 'Cleanup +?{"Q#.>; ClearOutputWindow() xz8e1M )t|:_Z Print "Merging RPC Photonics BSDF Data Files" 2`$*HPj+G SetTextColor(255,0,0) 0+FPAqX Print "Note: Script should be located in the same folder as the BSDF TXT files." w*VN= Print "Note: Do not run this script multiple times without deleting the output file between executions." L/tpT?$fi SetTextColor(0,0,0) NZvgkci_(u !E 5FU *s 'Current directory of this script (should be the same as the text files being merged) L@S\ rImw Dim cDir As String D$}8GYq cDir = MacroDir$ & "\" pux IJ |u>(~6 'Array which will be populated with the list of files to be merged '@t$3
hk Dim fList() As String, curFile As String kw#X,hP GetFileList( cDir, fList ) Zd[rn:9\ =GX5T(P8k Print "" fs'SCwx Print "Files found for merging:" ;
j!dbT~5 For Each curFile In fList '? 5- Print Chr(9) & curFile 3x+lf4" Next !<p,G`r vhfjZ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 6R n?pe^ Dim nameArray() As String, sampName As String >a?Bk4w nameArray = Split(fList(0)," 0-0.txt") 'Cc~|gOgD sampName = nameArray(0) ~S8:xG+s Print "" J?8Mo=UZz Print "Sample name: " & Chr(9) & sampName u9hd%}9Qd? 9&Jf4lC94 'Open an output file and write the FRED header data )UKX\nD"0 Dim outFile As String *:n~j9V- outFile = cDir & sampName & "_FRED.txt" ..)J6L5l Open outFile For Output As #1 \?xM%(:<Q Print #1, "type bsdf_data" %bi ie Print #1, "format angles=deg bsdf=value scale=1" -l= 4{^pK %~!4DXrMk 'Loop the file list, skip the two header lines and write the remaining data to file fqgp{(`@> Dim lineArray() As String, curLine As Long !Y~UO)u2 For Each curFile In fList Lnh=y2 Print "Merging data from file " & curFile uHg q"e ReadFile( cDir & curFile, lineArray ) 9J3fiA_ For curLine = 2 To UBound(lineArray) 6.D|\;9{c Print #1, lineArray(curLine) E_ns4k#uG Next ?})A-$f ~ Next r2=@1=?8 2l<2srEK 'Close the output file :ppaq Close #1 ! ?g+'OM u} ot-!}Q Print "Finished merging RPC data for sample " & sampName :$k*y%Z*N& Print "FRED formatted data file: " & Chr(9) & outFile pa>C}jk}6 End Sub #t
;` *ub2dH4/ 'Utility function to read the contents of a file into an array of strings. 2&1mI>:F Function ReadFile(ByVal fileName As String, _ =)Xj[NNRT ByRef lineArray() As String) As Long UGcmzwE v;]rFc#Px[ ReadFile = -1 2%%\jlT_ Dim oFSO As Object igxO:]? Set oFSO = CreateObject("Scripting.FileSystemObject") 2HeX( rB Erase lineArray j"qND=15 \&Yn)|! Dim fid As Long
!VGG2N8 If oFSO.fileexists( fileName ) Then /WN YS fid = FreeFile() >#]A2, Open fileName For Input As fid )~U1sW&t lineArray = Split(Input(LOF(fid), fid), vbCrLf) FIq'W:q: Close fid =QqH`.3 End If #3&@FzD_P Set oFSO = Nothing q'mh* Return UBound( lineArray ) !..<_qfw T\l`Y-vu End Function (]]hSkE $.`o
Sub GetFileList( ByVal in_dir As String, _ @:>"VP<( ByRef in_flist() As String ) ,Z{\YAh1 T fLqxioqZ 'Redimension the file list array w!f2~j~ Erase in_flist 2"ax*MQH<^ {-Y;! 'Tracks how many files are found tV)CDA&Z Dim fCount As Long *ID=X!v fCount = 0 :;{M0 ]oGd,v X 'Recurse directory and search for text files a"jE\OZ{+s Dim f As String 2) X#&IE f = Dir$(in_dir & "*.txt") xUdF.c While f <> "" -XBZ1q ReDim Preserve in_flist(fCount) &4?&tGi in_flist(fCount) = f /QXUD.(
8 fCount += 1 ` Ig5*X4| f = Dir$() R"t#dG]1t Wend '/>Mr!H# ReDim Preserve in_flist(fCount-1) a'VQegP(f\ DDrR9}k End Sub CS[]T9|_
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