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0JI6 ^mjU3q{; 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。 SHs [te[ |$6Ten[B# 背景: `*[\b9> 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。 tH&eKM4G 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。 4lR+nmAZ 图1. RPC Photonics工程漫射体结构及光束投射形状 kkfBVmuW dH.Fb/7f S !#5 步骤 g)\ Tex< &"WgO!pzD 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。 p+<qI~ Kp*3:XK 图2. RPC Photonics工程漫射体不同类型的散射数据 j94~cYV 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) xI<B)6D;f 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 sxA]o| 例如下所示: ;~DrsQb Sample name: EDF-C1-56 "=n%L +6% Merging data from file EDF-C1-56 0-0.txt %TR J Finished merging RPC data for sample EDF-C1-56 [T4{K& FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt WMnSkO 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 x1Y/^ks@2 a. 创建一个新的散射库 @GD $KR9 b. 散射模型命名 BJ]L@L% c. 改变散射模型为“Tabulated BSDF”. Y'jgp Vt d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) zRmVV}b e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 AA)pV- f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, -fV\JJ g. 点击OK %
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/m.$ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 k>Fw2!mA^ pGD-K41O] :Cezk D& 脚本代码: Xs|d#WbX :R
+BC2x '#Language "WWB-COM" g]JRAM @`+\vmfD Option Explicit [kpQ:'P3 _VjaTw8iM Sub Main l%('5oz@\ c$)>$&([ 'Cleanup a *
CXg.i ClearOutputWindow() ZvQZD=,F }f_@@#KB? Print "Merging RPC Photonics BSDF Data Files" -xLK/QAL SetTextColor(255,0,0) x^_c4,i) Print "Note: Script should be located in the same folder as the BSDF TXT files." uPbdzUk$ Print "Note: Do not run this script multiple times without deleting the output file between executions." y{<js!au SetTextColor(0,0,0) O"|d~VQ 9015PEO 'Current directory of this script (should be the same as the text files being merged) R\X;`ptT Dim cDir As String : O@(Sv cDir = MacroDir$ & "\" 8+7*> FD)1 p<h( 'Array which will be populated with the list of files to be merged -K$ugDi Dim fList() As String, curFile As String i;/;zG^=_ GetFileList( cDir, fList ) J=8Y D"1 *Q?8OwhJ Print "" t' J4zV Print "Files found for merging:" rNicg]:\x For Each curFile In fList **z^aH?B2 Print Chr(9) & curFile ^fsC]9NS Next 6:8Nz DF-PBVfpu 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. x!W5'DO Dim nameArray() As String, sampName As String G9xO>Xp^Al nameArray = Split(fList(0)," 0-0.txt") Het>G{ sampName = nameArray(0) 6Y6t.j0vN. Print "" gBWr)R Print "Sample name: " & Chr(9) & sampName a%a0/!U[ !mWm@}Ujg 'Open an output file and write the FRED header data 9bRUN< Dim outFile As String 6{udNv X outFile = cDir & sampName & "_FRED.txt" m5]
a Open outFile For Output As #1 _,v?rFLE Print #1, "type bsdf_data" nO'C2)bBSG Print #1, "format angles=deg bsdf=value scale=1" YMNLn9 FIAmAZH}_ 'Loop the file list, skip the two header lines and write the remaining data to file G(shZ=fq Dim lineArray() As String, curLine As Long [~cz|C# For Each curFile In fList ?IS[2 v$ Print "Merging data from file " & curFile ?G7*^y&Q ReadFile( cDir & curFile, lineArray ) eHGx00: For curLine = 2 To UBound(lineArray) ]oz >/\! Print #1, lineArray(curLine) @].!}tz Next `'P&={p8 Next 3}3b@: < #PPHxh*S 'Close the output file J(~1mIJjC Close #1 )K::WqR%w) 7@e}rh?N-| Print "Finished merging RPC data for sample " & sampName m~W[,7NE0& Print "FRED formatted data file: " & Chr(9) & outFile z0a`*3 -2 End Sub 1 |)CQ v@2@9/ 'Utility function to read the contents of a file into an array of strings. s S3RK Function ReadFile(ByVal fileName As String, _ =\oW{? ByRef lineArray() As String) As Long </5 9M 1DE ReadFile = -1 c68y\ Dim oFSO As Object (d,OLng Set oFSO = CreateObject("Scripting.FileSystemObject") Q3$DX,8? Erase lineArray J{kS4v*J PA*k| Dim fid As Long t;PG If oFSO.fileexists( fileName ) Then j"pyK@v2B fid = FreeFile() /[/{m ] Open fileName For Input As fid .!lLj1?p lineArray = Split(Input(LOF(fid), fid), vbCrLf) XhWo~zh" Close fid 1=9GV+`n End If CK|AXz+EN Set oFSO = Nothing cH:&S=>h Return UBound( lineArray ) -`z%<)!Y ]mNsG0r6 End Function #4"eQ*.*" x;} 25A| Sub GetFileList( ByVal in_dir As String, _ R^$EnrY(< ByRef in_flist() As String ) 1gt 7My xC0y2+)| 'Redimension the file list array 8:*ZuR|~ Erase in_flist D^p)`* &%)F5PT 'Tracks how many files are found #D?w,<_8, Dim fCount As Long B Nb_i H fCount = 0 M0)0~#?.D hgDFhbHtd6 'Recurse directory and search for text files @8aV*zjB Dim f As String h -091N f = Dir$(in_dir & "*.txt") S5Pn6'w While f <> "" *A}td8( ReDim Preserve in_flist(fCount) _/.VXW in_flist(fCount) = f hBaG*J{ fCount += 1 *}Z f = Dir$() Y$)y:.2# Wend QGGBI Ku
ReDim Preserve in_flist(fCount-1) dNqj | Vu ZZ :*c"b: End Sub
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