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摘要: >}+{;d Alxf;[s 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。 m+<&NDj. U?*zb 背景: 3iCe5VF 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。 QK]P=pE'C 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。 ^dI;B27E* 图1. RPC Photonics工程漫射体结构及光束投射形状 ~"#0rPT hdPGqJE 5/=$p:E> 步骤 q)?%END uUI#^ A 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 k=]e7~! (Q*q#U 图2. RPC Photonics工程漫射体不同类型的散射数据 :_8K8Sa 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) &C9IR,& 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 B\J[O5}, 例如下所示: Kh]es,$D Sample name: EDF-C1-56 v$y\X3)mB Merging data from file EDF-C1-56 0-0.txt @t%da^-HS" Finished merging RPC data for sample EDF-C1-56 -9b=-K.y FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt \p4*Q}t 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 6] x6FeuS a. 创建一个新的散射库 9@*pC@I) b. 散射模型命名 f2WVg;Z c. 改变散射模型为“Tabulated BSDF”. [V'c d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ^E70$yB^ 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。 yKML{N1D 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, {7:1F)Pj g. 点击OK e>MtDJ5 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Hn/t'D3 j1_>>xB Xf4Q Lw/r 脚本代码: T|~5dZL E{,WpU '#Language "WWB-COM" k79OMf<v -H60T,o
Option Explicit v;(cJ,l V%R]jbHZ# Sub Main Zux L2W f#s 6 'g
'Cleanup 7ys' [G|}r ClearOutputWindow() Ku[q#_7 [G_ ;78 Print "Merging RPC Photonics BSDF Data Files" fzJiW@-T SetTextColor(255,0,0) H:G``Vq;0m Print "Note: Script should be located in the same folder as the BSDF TXT files." 1I2ndt Print "Note: Do not run this script multiple times without deleting the output file between executions." LQF;T7VKS) SetTextColor(0,0,0) MV5$e so` \e^d 'Current directory of this script (should be the same as the text files being merged) J_)F/S!T Dim cDir As String 4 $k{, cDir = MacroDir$ & "\" upMs yLp( }9ulHiR 'Array which will be populated with the list of files to be merged !!.@F;]W Dim fList() As String, curFile As String \; XJ$~> GetFileList( cDir, fList ) w"v96%"Y qjRbsD> Print "" YIN* '!N Print "Files found for merging:" |;J`~H"K For Each curFile In fList nk!uO^ Print Chr(9) & curFile /
B!j`UK Next Ox)<"8M ^@x&n)nzP 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. v}!lx)# Dim nameArray() As String, sampName As String =sWK;` nameArray = Split(fList(0)," 0-0.txt") Ea4zC|; sampName = nameArray(0) CV[ 9i Print "" gPn0-)< Print "Sample name: " & Chr(9) & sampName ftn10TO * rw)!>j+&A 'Open an output file and write the FRED header data W(62.3d~}? Dim outFile As String l9QI lTc7 outFile = cDir & sampName & "_FRED.txt" ",~ZO<P Open outFile For Output As #1 LDegJer-v Print #1, "type bsdf_data" H0b{`!'Fs: Print #1, "format angles=deg bsdf=value scale=1" U2`:' tO&n$$ 'Loop the file list, skip the two header lines and write the remaining data to file m2m
;|rr Dim lineArray() As String, curLine As Long hGKQK
^bn For Each curFile In fList @CM5e! Print "Merging data from file " & curFile rX^uHq8 ReadFile( cDir & curFile, lineArray ) ]HWeVhG For curLine = 2 To UBound(lineArray) p63fpnH Print #1, lineArray(curLine) $JOtUB{ Next {JdXn Next $$ $[Vn_H< dOaOWMrfdf 'Close the output file |7K>` Close #1 `j{q *QN,wBQ Print "Finished merging RPC data for sample " & sampName # ,H!<X;SS Print "FRED formatted data file: " & Chr(9) & outFile _k}Qe; End Sub _rSwQ<38> xm=Gt$>.o 'Utility function to read the contents of a file into an array of strings. 7Tp+]"bL Function ReadFile(ByVal fileName As String, _ n+
H2cl } ByRef lineArray() As String) As Long U
`lp56 3K||( ReadFile = -1 VOYQ<tg Dim oFSO As Object %4R1rUrgt| Set oFSO = CreateObject("Scripting.FileSystemObject") i\uj>;B Erase lineArray V}`ri~ GsO(\hR6^ Dim fid As Long ~zZOogM< If oFSO.fileexists( fileName ) Then NVQ.;" 2w fid = FreeFile() tW!*W? Open fileName For Input As fid Ze/\IBd lineArray = Split(Input(LOF(fid), fid), vbCrLf) le_aIbB"P Close fid 83]m/Iz End If hKg +A Set oFSO = Nothing cD9U^SOS Return UBound( lineArray ) e2fv% "([gN: End Function d %FLk=] 3zmbx~| =\ Sub GetFileList( ByVal in_dir As String, _ +P9eE,WR ByRef in_flist() As String ) *"OlO}o VL5VYv=: 'Redimension the file list array eU)QoVt Erase in_flist JPL`/WA0 ?c8(<_I+ 'Tracks how many files are found )zy;! Dim fCount As Long Xhyn! &H5 fCount = 0 #%%!r$UL Af@\g-<W_ 'Recurse directory and search for text files *qYw Dim f As String FbMtor f = Dir$(in_dir & "*.txt") ]Ar,HaX- While f <> "" Xe:rPxZf~ ReDim Preserve in_flist(fCount) b)#rUI|O in_flist(fCount) = f I5QtPqB> fCount += 1 T#6g5Jnsp f = Dir$() E`xpZ>$mPx Wend T12Zak4.= ReDim Preserve in_flist(fCount-1) SXe1Q8; i`<L#6RBT End Sub m8
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