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摘要: ^k J>4 wF=?EK(;P{ 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。 i8w/a ,{6Vf|? 背景: i 1dE.f; 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。 Phq"A[4=O 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。 Uv) B 图1. RPC Photonics工程漫射体结构及光束投射形状 v_|k:l DbWaF5\yD (zr2b 步骤 1R.|j_HYy XgI;2Be+&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。 *q&^tn b [_HY6gr 图2. RPC Photonics工程漫射体不同类型的散射数据 H|)F-aL[ 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) lxsn(- j 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 ;~,)6UX7 例如下所示: P9
w);jp; Sample name: EDF-C1-56 N
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2< Merging data from file EDF-C1-56 0-0.txt Nn#;Kjul. Finished merging RPC data for sample EDF-C1-56 iV5S[uy72. FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt u']}Z%A9` 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 m)l'i!Y a. 创建一个新的散射库 Np"~1z.(b b. 散射模型命名 I:6H65(& c. 改变散射模型为“Tabulated BSDF”. &>f] 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 ) J
?0P{{ 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。 "T@9#7Obu 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, 8,@0~2fz# g. 点击OK y[{}124 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 CzDV^Iv;Q{ @?JFqwq! B ({g|}|G+ 脚本代码: V]Rt[l] mCe"=[ '#Language "WWB-COM" WES$B7y hnimd~E52k Option Explicit (u4'*[o\t W m&* Sub Main I@oSRB []jbzVwS2 'Cleanup <v6W
l\ ClearOutputWindow() ~8&P*oFC JU#m?4g Print "Merging RPC Photonics BSDF Data Files" _lDNYpv SetTextColor(255,0,0) K&VMhMVb Print "Note: Script should be located in the same folder as the BSDF TXT files." =w!2R QB Print "Note: Do not run this script multiple times without deleting the output file between executions." !k Heslvi SetTextColor(0,0,0) Hqtv`3g |~o0-: 'C 'Current directory of this script (should be the same as the text files being merged) <naxpflom0 Dim cDir As String [<|$If99\ cDir = MacroDir$ & "\" sd%m{P2 @'A0Lq+# 'Array which will be populated with the list of files to be merged Y(u`K=* Dim fList() As String, curFile As String nAC>']K4$ GetFileList( cDir, fList ) iR"6VO
nDS\2 Print "" &hUEOif Print "Files found for merging:" y=0)vi{] For Each curFile In fList "ql$Rz8 Print Chr(9) & curFile F9"Xu-g Next I7W`\d) N!fjN >cw 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. lMl'+ yy Dim nameArray() As String, sampName As String \ Q^grX nameArray = Split(fList(0)," 0-0.txt") 3Vbt(K sampName = nameArray(0) 18Vn[}]" Print "" "@^Q"RF Print "Sample name: " & Chr(9) & sampName @+0dgkJ "Zy:q'`o 'Open an output file and write the FRED header data S['cX ~ Dim outFile As String .C.b5x! outFile = cDir & sampName & "_FRED.txt" W~PMR/^i Open outFile For Output As #1 P4zwTEk` Print #1, "type bsdf_data" k }{o:
N Print #1, "format angles=deg bsdf=value scale=1" \H9:%Tlp~4 l-P6B9e|\ 'Loop the file list, skip the two header lines and write the remaining data to file `8r$b/6 Dim lineArray() As String, curLine As Long !"o\H(siT For Each curFile In fList ,!, tU7-H Print "Merging data from file " & curFile sH>`eqY ReadFile( cDir & curFile, lineArray ) =~"X/>' For curLine = 2 To UBound(lineArray) %ZcS"/gf Print #1, lineArray(curLine) (S4HU_,88 Next @lq)L Next ExQ\qp3 CiGXyhh 'Close the output file C_'EO<w$ Close #1 jABFdNjri 8rx|7 Print "Finished merging RPC data for sample " & sampName ( et W4p Print "FRED formatted data file: " & Chr(9) & outFile 93Zij<bH?e End Sub [2YPV\= 9^9-\DG 'Utility function to read the contents of a file into an array of strings. ~ g-( Function ReadFile(ByVal fileName As String, _ 0b/@QgJ ByRef lineArray() As String) As Long LF
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WzoI0E` ReadFile = -1 7r50y> Dim oFSO As Object OrYN-A4{ Set oFSO = CreateObject("Scripting.FileSystemObject") V2|By,. Erase lineArray C/QmtT~`e yXoNfsv Dim fid As Long Mk0x#-F If oFSO.fileexists( fileName ) Then nF_q{e7 fid = FreeFile() 8{QCW{K Open fileName For Input As fid -8Hc M\b lineArray = Split(Input(LOF(fid), fid), vbCrLf) `U b*rOMu Close fid I`*5z;Q!%@ End If 4'=Q:o*w` Set oFSO = Nothing <i4]qO(0u Return UBound( lineArray ) ^EKRbPA9:< M.6uWwzQR End Function Vfga%K%l F J
<;xkT1x Sub GetFileList( ByVal in_dir As String, _ 6T|Z4f| ByRef in_flist() As String ) g1|Pyt{ ^N[ Cip}8 'Redimension the file list array ;ne`ppz0 Erase in_flist Pc =ei |(ab0b # 'Tracks how many files are found 4sntSlz)~k Dim fCount As Long !'~L dl fCount = 0 ap'La|9t> tk R~(h 'Recurse directory and search for text files sT"ICooc Dim f As String l^}u S|c( f = Dir$(in_dir & "*.txt") ||Owdw|{ While f <> "" < K!r\^ ReDim Preserve in_flist(fCount) 1U#W=Fg' in_flist(fCount) = f ;y. ;U#O fCount += 1 qD4s?j-9 f = Dir$() yf0v,]v[ Wend YJMs9X~3 ReDim Preserve in_flist(fCount-1) R6BbkYWrX BO4;S/ O End Sub wM4{\ f\
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