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摘要: 9c1q:>| R iV]SgV9 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。 8
?:W{GAo 5"q{b1 背景: ;;U&mhz` 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。 ~EYdE qS) 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。 rfZg 图1. RPC Photonics工程漫射体结构及光束投射形状 p!?7; @:!% Z` Ml+f3#HP 步骤 G`;mSq6i fg1uqS1rg 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。 &;GoCU Le ;[Esop 图2. RPC Photonics工程漫射体不同类型的散射数据 +l7Bu} _? 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) g K dNgU 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 HDu|KW$o1 例如下所示: 6e}T
zc\@( Sample name: EDF-C1-56 <!|=_W6 Merging data from file EDF-C1-56 0-0.txt L9whgXD Finished merging RPC data for sample EDF-C1-56 l|9'l[}& FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt _F8-4 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Rob:W| a. 创建一个新的散射库 :X*uE^bH b. 散射模型命名 _qQo}|/q c. 改变散射模型为“Tabulated BSDF”. bs?4|#[K d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) otP2qAI e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 /`O'eH f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, j{zVVT g. 点击OK Vr&v:8:wb 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 =)]RD%Oq ^1--7#H 2"Y=*s 脚本代码: xz,M>Ua 6b!1j,\Vx '#Language "WWB-COM" 0XL[4[LdA \}Pr!tk! Option Explicit ,l\D@<F .3
^*_ Sub Main Z \- 2Ju,P_<dt 'Cleanup #P1;*m ClearOutputWindow() fAvB!e ):Ekf2 Print "Merging RPC Photonics BSDF Data Files" &0-Pl.M SetTextColor(255,0,0) e9B$"_ &2 Print "Note: Script should be located in the same folder as the BSDF TXT files." :!,.c$M Print "Note: Do not run this script multiple times without deleting the output file between executions." Aq/wa6^% SetTextColor(0,0,0) -%t8a42 uYc&Q$U 'Current directory of this script (should be the same as the text files being merged) \<y#$:4r<8 Dim cDir As String [3W+h1 cDir = MacroDir$ & "\" Mz6|#P}.s $I/RN 'Array which will be populated with the list of files to be merged jH4Wu`r;m Dim fList() As String, curFile As String Szlww GetFileList( cDir, fList ) )v.\4Q4 /B Print "" It^_?oiK Print "Files found for merging:" P`M1sON~ For Each curFile In fList [dXRord Print Chr(9) & curFile 'zTa]y]a Next z.kBQ{P 9,
792b 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. vYG$>* Dim nameArray() As String, sampName As String \G1(r=fU nameArray = Split(fList(0)," 0-0.txt") *K w/ilI sampName = nameArray(0) !E\J`K0_e Print "" Xc]Q_70O Print "Sample name: " & Chr(9) & sampName HM\gOz %!)Dk< 'Open an output file and write the FRED header data =TXc- J Dim outFile As String T}A{Xu*:+H outFile = cDir & sampName & "_FRED.txt" )$I"LyK) Open outFile For Output As #1 HC ?XNR& Print #1, "type bsdf_data" Z?'){\$* Print #1, "format angles=deg bsdf=value scale=1" 2VS#=i(B^ 7PI|~Ifi 'Loop the file list, skip the two header lines and write the remaining data to file /?QBMI Dim lineArray() As String, curLine As Long 4:v{\R For Each curFile In fList <i1P ~ Print "Merging data from file " & curFile MT@Uu ReadFile( cDir & curFile, lineArray ) YcBAW4B` For curLine = 2 To UBound(lineArray) r.zJ/Tk Print #1, lineArray(curLine) %|3UWN Next mdHC{sp Next n?A;'\cK KHXnB 'Close the output file rk(0w|zR+ Close #1 o>Z+=&BZ@a zL3'',Ha Print "Finished merging RPC data for sample " & sampName ^zaN?0%S33 Print "FRED formatted data file: " & Chr(9) & outFile bDPT1A`F End Sub 1YMu\( RpY#_\^hI 'Utility function to read the contents of a file into an array of strings. O8ZHIs Function ReadFile(ByVal fileName As String, _ !b+Kasss9 ByRef lineArray() As String) As Long yf6&'Y{ n-_-;TYH ReadFile = -1 ~UJ_Rr54 Dim oFSO As Object [HENk34 Set oFSO = CreateObject("Scripting.FileSystemObject") c8jq.y v Erase lineArray Au/n|15->C )Hy|K1 Dim fid As Long D}Lx9cL If oFSO.fileexists( fileName ) Then ZK]C!8\2| fid = FreeFile() C zvi': Open fileName For Input As fid "GofQ5,| lineArray = Split(Input(LOF(fid), fid), vbCrLf) 2xd G&}$fa Close fid $Mp#tH28 End If 1jozM"H7Q Set oFSO = Nothing z7J2O Return UBound( lineArray ) 5<ycF_ w#,C{6 End Function I(Yyg,1Z #X"eg Sub GetFileList( ByVal in_dir As String, _ Kq;Yb& ByRef in_flist() As String ) &u_f:Pog Dl%NVi+n 'Redimension the file list array iB 5 Se Erase in_flist UpS`KgF"v MLcc 'Tracks how many files are found Ui7S8c#tH Dim fCount As Long 7m=tu?@ fCount = 0 xAD: Z" ]W%<<S 'Recurse directory and search for text files d1#;>MiU Dim f As String ;,]T|>M f = Dir$(in_dir & "*.txt")
sD*8:Hl While f <> "" igsJa1F ReDim Preserve in_flist(fCount) :-
ydsR/ in_flist(fCount) = f \qqt/ fCount += 1 x,z +l-y f = Dir$() yA!#>u%g Wend }CA oB::& ReDim Preserve in_flist(fCount-1) *#,wV
^60BQ{ne End Sub Nd*zSsVlq _}7N,Cx @%K@oD L QQ:2987619807 W9T,1h5x
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