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摘要: Fb^:V4<T 'f[T&o&L/ 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。 Ys@}3\Mc 30XR
82P/ 背景: +w.JpbQ& 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。 Rniq(FAx 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。 !X"K=zt" 图1. RPC Photonics工程漫射体结构及光束投射形状 T2SP
W@#Z3 |_`E1Y}} et,f_fd7v 步骤 mMb'@ Z7_m)@%;kk 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。 3H|_mX v=_6XF 图2. RPC Photonics工程漫射体不同类型的散射数据 3
|hHR 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) `0P$#5? 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ?RK]FP"A 例如下所示: o3I Tr'; Sample name: EDF-C1-56 2_zp:v Merging data from file EDF-C1-56 0-0.txt BO~PT,QrF Finished merging RPC data for sample EDF-C1-56 `FYv3w2 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt |P -8HlOr 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 J(c{y]` J a. 创建一个新的散射库 |g
#K]v b. 散射模型命名 jFA{+Yr1 c. 改变散射模型为“Tabulated BSDF”. t%'Z<DmG+ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) wvbPnf^y e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 *d"DA[( f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, =|I>G?g- g. 点击OK Aj2OkD 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 d/bEt& o(S{VGi, H63,bNS s 脚本代码: w9,iq@ kAu+zX>S+ '#Language "WWB-COM" >y[oP!-|P L{(QpgHZ Option Explicit mml<9fbH #|*F1K Sub Main iVd.f
A Y]L9Y9 'Cleanup 'UMXq~RMe ClearOutputWindow() m< 3Ao^I+ "g'jPwFG Print "Merging RPC Photonics BSDF Data Files" G.(mp<- SetTextColor(255,0,0) k'#(1(xj Print "Note: Script should be located in the same folder as the BSDF TXT files." QF&W`c Print "Note: Do not run this script multiple times without deleting the output file between executions." ^NX"sM0g SetTextColor(0,0,0) {W]=~*w 'A:x/iv}^ 'Current directory of this script (should be the same as the text files being merged) (HSgEs1d Dim cDir As String 1qf!DMcdZ cDir = MacroDir$ & "\" RLSc+kDH_ RB+N
IoQQ| 'Array which will be populated with the list of files to be merged xia |+ Dim fList() As String, curFile As String ds&e|VSH; GetFileList( cDir, fList ) 7c~u=U" D5:{fWVsV/ Print "" Q" ,0F{' Print "Files found for merging:" Rr!Y3)f; For Each curFile In fList 2AtLyN'. Print Chr(9) & curFile 2D:fJ~|-[ Next L~ IhsiB "m ^'
&L 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 1P(|[W1 Dim nameArray() As String, sampName As String
jq+A-T}@ nameArray = Split(fList(0)," 0-0.txt") k%E2n:|* sampName = nameArray(0) Fr%d}g Print "" jiYmb8Q4D Print "Sample name: " & Chr(9) & sampName ak:ibV 9Ffp2NW`; 'Open an output file and write the FRED header data ;\[(- )f!= Dim outFile As String 5ux`U{`m outFile = cDir & sampName & "_FRED.txt" Bf$_XG3
Open outFile For Output As #1 &[At`Nw71 Print #1, "type bsdf_data" H_0/f8GwnG Print #1, "format angles=deg bsdf=value scale=1" ;s~X -CRQp1] 'Loop the file list, skip the two header lines and write the remaining data to file *bxzCI7b Dim lineArray() As String, curLine As Long ZvUCI8 For Each curFile In fList ixV0|P8,c Print "Merging data from file " & curFile @fa@s-wb ReadFile( cDir & curFile, lineArray ) 8Th` ]tI For curLine = 2 To UBound(lineArray) !H2QjW Print #1, lineArray(curLine) [xT:]Pw} Next BbRBT@ Next 8@PX7!9 =+x yI 'Close the output file ]r-C1bKD` Close #1 TO-nD> YG8>czC Print "Finished merging RPC data for sample " & sampName 9{$'S4 Print "FRED formatted data file: " & Chr(9) & outFile oX4q`rt End Sub +z9gbcx nN~~cV 'Utility function to read the contents of a file into an array of strings. 1-PoZ[p-R Function ReadFile(ByVal fileName As String, _ g/&T[FOr ByRef lineArray() As String) As Long [y0O{,lI ?\#N9+{W ReadFile = -1 wP57Pf0 Dim oFSO As Object -kS~xVS| Set oFSO = CreateObject("Scripting.FileSystemObject") ^{\<N()R Erase lineArray TI !a )X {>"NyY Dim fid As Long 5"/J^"!h If oFSO.fileexists( fileName ) Then (oJ9k[( fid = FreeFile() :=9] c17= Open fileName For Input As fid ex<O]kPFE lineArray = Split(Input(LOF(fid), fid), vbCrLf) ~Aq5XI%i Close fid 4HAp{a1 End If vm'5s]kdh Set oFSO = Nothing ;r/;m\V Return UBound( lineArray ) jt@SZI` ](B@5-^ End Function #UtFD^h zFQ&5@43 Sub GetFileList( ByVal in_dir As String, _ CdUAy|!`R ByRef in_flist() As String ) ?go:e# uHIiH@S 'Redimension the file list array huudBc
A[ Erase in_flist {}o>{&X O'GG Ti]e 'Tracks how many files are found UA~RK2k? Dim fCount As Long -AYA~O(& fCount = 0 9]'($:LF08 "C?5f]T 'Recurse directory and search for text files ez3Z3t` Dim f As String hCYQGx0 f = Dir$(in_dir & "*.txt") E1&b#TE6O While f <> "" l/y]nw ReDim Preserve in_flist(fCount) $^ 'aCU0C in_flist(fCount) = f I5AO?BzJ fCount += 1 ~dHM4lGY f = Dir$() 8SmnMt Wend IkzTJ%> ReDim Preserve in_flist(fCount-1) q@hp.(V j%V["?) End Sub B$?qQ|0:=
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