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摘要: qPWf=s7! apgKC; 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。 QD%6K=8Q mH5>50H; 背景: _x#y 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。 ; C(5lD&\5 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。 ]` A*7 图1. RPC Photonics工程漫射体结构及光束投射形状 sG[qlzR=8 lN{>.q@V`r Z7[S698 步骤 w'VuC82SZ 4xg1[Z%: 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。 >i.$s O,
:| 图2. RPC Photonics工程漫射体不同类型的散射数据 ?i\V^3S n$ 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) TBba3% 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 ^P/OHuDL 例如下所示: rd$T6!I Sample name: EDF-C1-56 e^\#DDm Merging data from file EDF-C1-56 0-0.txt 9F6dKPN: Finished merging RPC data for sample EDF-C1-56 gTB|IcOs FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Tyb'p9 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 QtWe,+WWV a. 创建一个新的散射库 99,=dzm b. 散射模型命名 '&K' 0qG c. 改变散射模型为“Tabulated BSDF”. SMRCG"3qwA d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) g2'K3e?.% e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 !8W0XUqh+ f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, 7^UY%t g. 点击OK W[]|Uu/% 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 3pL4Zhf M(C}2.20 OT6Te& 脚本代码: h^`@%g9 S gSyBoY '#Language "WWB-COM" KM"?l<x0Y ui|6ih$+ Option Explicit B4+u/hkbh? Nlwt}7 Sub Main bJR\d0Z 0]]OE+9<c 'Cleanup *-q&~ ClearOutputWindow() ^nOh8L; O*,O]Q Print "Merging RPC Photonics BSDF Data Files" ZC<EPUV( SetTextColor(255,0,0) f4NN?"W) Print "Note: Script should be located in the same folder as the BSDF TXT files." D;+Y0B Print "Note: Do not run this script multiple times without deleting the output file between executions." ncOl}\Q9 SetTextColor(0,0,0) yT7{,Z7t \:q @I]2 'Current directory of this script (should be the same as the text files being merged) t
U~q4$qqE Dim cDir As String &G\C[L cDir = MacroDir$ & "\" -HuIz6 T-kHk( 'Array which will be populated with the list of files to be merged %]tW2s" Dim fList() As String, curFile As String p<l+js(5| GetFileList( cDir, fList ) d.B<1"MQ V2@(BliP Print "" !O'p{dj][ Print "Files found for merging:" ';D>Z?l For Each curFile In fList K]7[|qf& Print Chr(9) & curFile EqIs&){ Next EUH9R8) ^(7l! 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. T<yfpUzX Dim nameArray() As String, sampName As String !/|B4Yv nameArray = Split(fList(0)," 0-0.txt") v{*2F sampName = nameArray(0) }v_|N"@ Print "" dpt P(H Print "Sample name: " & Chr(9) & sampName r(wtuD23q n%~r^C_ 'Open an output file and write the FRED header data )fS6H<* Dim outFile As String a_b+RMy outFile = cDir & sampName & "_FRED.txt" Y( K`3?A Open outFile For Output As #1 Py+ B 2G| Print #1, "type bsdf_data" a8k`Wog Print #1, "format angles=deg bsdf=value scale=1" 1 un! t 0p 'Loop the file list, skip the two header lines and write the remaining data to file G2@'S&2@s Dim lineArray() As String, curLine As Long +x4*T For Each curFile In fList ,5 3`t Print "Merging data from file " & curFile $,I@c"m{ ReadFile( cDir & curFile, lineArray ) G'nSnw For curLine = 2 To UBound(lineArray) uz=9L<$ Print #1, lineArray(curLine) $!z .[GL Next `7V1 F.\ Next d$?+>t/ A
L|,\s 'Close the output file Fy.!amXu Close #1 puEu)m^ s(L!]d.S$y Print "Finished merging RPC data for sample " & sampName "(';UFa Print "FRED formatted data file: " & Chr(9) & outFile g0;6}n End Sub jr-9KxE &Fk|"f+ 'Utility function to read the contents of a file into an array of strings. l6IT o@&J Function ReadFile(ByVal fileName As String, _ 0Q
cJ Ek ByRef lineArray() As String) As Long ke/4l?zs hW;n^\lF#e ReadFile = -1 EgzdRB\Cf Dim oFSO As Object <5ULu(b&$ Set oFSO = CreateObject("Scripting.FileSystemObject") ;LKYA?=/V Erase lineArray F^}d>2W( lC
d\nE8G Dim fid As Long ,&Zk63V If oFSO.fileexists( fileName ) Then cN\_1 fid = FreeFile() 2:yXeSeA Open fileName For Input As fid {5+69&:G. lineArray = Split(Input(LOF(fid), fid), vbCrLf) ;~`/rh
V\ Close fid Wm)Id_ End If 7 VYhRC- Set oFSO = Nothing @x*,fk Return UBound( lineArray ) &{q'$oF yaHkWkl
= End Function '?X?'_3 8N<mV^|} Sub GetFileList( ByVal in_dir As String, _ sdgI , ByRef in_flist() As String ) 4"^W/Zo 7.kH="@ 'Redimension the file list array ?1eu9; q\* Erase in_flist Dx9k%G)! rj1%IzaXU^ 'Tracks how many files are found M}=fdH Dim fCount As Long rQTG-& , fCount = 0 lf R}cx Pt6d5EIG 'Recurse directory and search for text files eqWs(` Dim f As String @TzUcE f = Dir$(in_dir & "*.txt") /}CAd While f <> "" s)sT\crP@ ReDim Preserve in_flist(fCount) ;L%\[H>G in_flist(fCount) = f D@@"w+ fCount += 1 Pb59RE:7V f = Dir$() 9wdX#=I Wend OE}c$!@ ReDim Preserve in_flist(fCount-1) izu_KBzy !D/W6Ic@ End Sub b%VZPKA; Q}g"pl G=kW4rAk QQ:2987619807 ^j1G08W
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