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摘要: ?SQE5Z 7 J^rv9i4 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。 _iKq~\v2 t-
u VZ!`\ 背景: \]Kh[z0" 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。 3P~o"a> 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。 uJx"W 图1. RPC Photonics工程漫射体结构及光束投射形状 q/3ziVd7p I&?Qq k 84HUBud76Y 步骤 0tISXu- D.D$#O_n.S 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 iUMY!eqp m^' uipa\ 图2. RPC Photonics工程漫射体不同类型的散射数据 ZN"j%E{d 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) hc
(e$## 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 $p!yhn7 例如下所示: gK#mPcn^ Sample name: EDF-C1-56 o)6p A^+ Merging data from file EDF-C1-56 0-0.txt dpQG[vXe Finished merging RPC data for sample EDF-C1-56 Gir#"5F FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt NW~z&8L 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 DU%w1+u a. 创建一个新的散射库 Ze<K=Q%(i b. 散射模型命名 *vgl*k?) c. 改变散射模型为“Tabulated BSDF”. g&dPd7 d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) W{z.?$SH 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。 $,I q;*7N 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, {NpM.; g. 点击OK ['z[ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 3X9b2RY*L/ x@mL $ jF`BjxrG 脚本代码: l1ZY1#%j NmK8<9`u '#Language "WWB-COM" A5,t+8`aci 8x`.26p Option Explicit Iff9'TE y(R?
,wa=] Sub Main Va Z!.#(P f}guv~K 'Cleanup N@B9
@8h ClearOutputWindow() imQURC (E,T#uc{ Print "Merging RPC Photonics BSDF Data Files" E{6~oZ#L SetTextColor(255,0,0) Q1V9PRZX Print "Note: Script should be located in the same folder as the BSDF TXT files." sNun+xsf^ Print "Note: Do not run this script multiple times without deleting the output file between executions." XdH\OJ SetTextColor(0,0,0) rt
JtK6t ]weoTn: 'Current directory of this script (should be the same as the text files being merged) zy*/T>{# Dim cDir As String hdTzCfeZ5@ cDir = MacroDir$ & "\" t|t#vcB aq7~QX_0G 'Array which will be populated with the list of files to be merged !w
BJ,&E Dim fList() As String, curFile As String #plY\0E@ GetFileList( cDir, fList ) $mF_,| VDTcR Print "" &.TTJsKG h Print "Files found for merging:" \uss Uv For Each curFile In fList %s19KGpA Print Chr(9) & curFile 8[6o ( Next @p\}p Y$T Dk48@`l2 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. \EseGgd21 Dim nameArray() As String, sampName As String Vh>Z,()>>@ nameArray = Split(fList(0)," 0-0.txt") bLt.O(T} sampName = nameArray(0) m N8pg4 Print "" 26CS6(sn Print "Sample name: " & Chr(9) & sampName 6q
2_WX `y+tf?QN 'Open an output file and write the FRED header data
Ov<NsNX] Dim outFile As String D7_*k%;@ outFile = cDir & sampName & "_FRED.txt" 0p89: I*0 Open outFile For Output As #1 w3jO6*_ M Print #1, "type bsdf_data" ^*fQX1h< Print #1, "format angles=deg bsdf=value scale=1" 'vN G(h#%d }@.|?2b + 'Loop the file list, skip the two header lines and write the remaining data to file 8QMPY[{ Dim lineArray() As String, curLine As Long :1Sl"?xU For Each curFile In fList }1IpON
Print "Merging data from file " & curFile [9:9Ql_h ReadFile( cDir & curFile, lineArray ) +}jJ&Z9) For curLine = 2 To UBound(lineArray) },|M9I0 Print #1, lineArray(curLine) V59(Z Next hlt[\LP=$ Next s(W|f|R =-p$jXVW% 'Close the output file m.,U:> Close #1 ID/F O*#*%RL| Print "Finished merging RPC data for sample " & sampName 6AocmR0D' Print "FRED formatted data file: " & Chr(9) & outFile aMTu-hA End Sub ^j7azn )=Jk@yj8x 'Utility function to read the contents of a file into an array of strings. B7imV@< Function ReadFile(ByVal fileName As String, _ bJs9X/E ByRef lineArray() As String) As Long &r:7g%{n
k1Q?'<` ReadFile = -1 $ MC)}l Dim oFSO As Object .`&F>o(A Set oFSO = CreateObject("Scripting.FileSystemObject") ~K@'+5Pc Erase lineArray F:a ILx Q|@4bz i) Dim fid As Long z?35=%~w If oFSO.fileexists( fileName ) Then 6uR^%W8] fid = FreeFile() +@r*} Open fileName For Input As fid -lv)tHs< lineArray = Split(Input(LOF(fid), fid), vbCrLf) 5 (A5Y-B Close fid JfPD}w End If 'F3)9&M Set oFSO = Nothing {5
sO Return UBound( lineArray ) iQ"XLrpl Vx-7\NB End Function A`R{m0A a0Zv p>Ft Sub GetFileList( ByVal in_dir As String, _ |ZQ@fmvL/p ByRef in_flist() As String ) h yv2SxP* PdvqDa8 'Redimension the file list array 7x<i :x3 Erase in_flist 71l%MH YID4w7| 'Tracks how many files are found ~zw]5| Dim fCount As Long A%^ILyU6c fCount = 0 {^N[("` )RcL/n 'Recurse directory and search for text files &ot/nQQ Dim f As String LCQE_}Mh f = Dir$(in_dir & "*.txt") 3'X.}>o While f <> "" W|o'& ReDim Preserve in_flist(fCount) \J6j38D5 in_flist(fCount) = f )(@Hd fCount += 1 9HX =T% f = Dir$() (IPY^>h Wend 1m .W< ReDim Preserve in_flist(fCount-1) .rf"
(lM Ox-|JJ= End Sub >
%KuNy{ !Ta>U^7 !* OJ.W& QQ:2987619807 C$5[X7'
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