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摘要: "-\8Y>E @k\,XV`T~t 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。 gX|\O']6 \(}pm#O 背景: q3`~uTzk 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。 qC3PKlhv6 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。 yyGn< 图1. RPC Photonics工程漫射体结构及光束投射形状 xZ(d*/6E a*t>Ks'C CdMV( 步骤 gGx<k3W^ 0U !&|i\ 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。 -C8LM ls )@<HG$# 图2. RPC Photonics工程漫射体不同类型的散射数据 $~\Tl:!#? 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) 0Hx'C^m72 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 E,fbIyX 例如下所示: ce*?crOV Sample name: EDF-C1-56 $LG.rJ/* Merging data from file EDF-C1-56 0-0.txt A-*MH#QUKh Finished merging RPC data for sample EDF-C1-56 IJC]Al,df FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 8"A0@fNz 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 DR]4Tc z# a. 创建一个新的散射库 /B|"<`-H b. 散射模型命名 "
t?44[ c. 改变散射模型为“Tabulated BSDF”. ?A04qk d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) x3F94+<n{ e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 QU(Lv(/O f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, phB d+zQc g. 点击OK YN~1.!F 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 FEX67A8/; *1T~ruNqa x=X&b%09 脚本代码: GIfs]zVr` [^XD@ '#Language "WWB-COM" FC L0w2qF Option Explicit Pn L?zae G&`5o*).bb Sub Main EfkBo5@ Qi eR/X9< 'Cleanup Kzy9i/bL ClearOutputWindow() )\kNufP q^7=/d8 Print "Merging RPC Photonics BSDF Data Files" 19RbIG/X SetTextColor(255,0,0) k(v &+v Print "Note: Script should be located in the same folder as the BSDF TXT files." GaV OMT Print "Note: Do not run this script multiple times without deleting the output file between executions." ylDfr){ SetTextColor(0,0,0) 6WoFf !1@oZ( 'Current directory of this script (should be the same as the text files being merged) ;Wsl 'e/ Dim cDir As String C;#gy- cDir = MacroDir$ & "\" _@VKWU$$
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q 'Array which will be populated with the list of files to be merged uaxkGEXr Dim fList() As String, curFile As String O2fFh_\ GetFileList( cDir, fList ) "{d[V(lE" dj}P|v/;z Print "" F=f9##Y?7M Print "Files found for merging:" s?fEorG
For Each curFile In fList 85Kf>z::c Print Chr(9) & curFile A0Q1"b= Next Ih;D-^RQ %o`Cp64`Q 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Mko,((>I1 Dim nameArray() As String, sampName As String ~q}]/0-m nameArray = Split(fList(0)," 0-0.txt") Ri}JM3\J sampName = nameArray(0) l1%*LyD Print "" 5d}bl{ Print "Sample name: " & Chr(9) & sampName PWyFys 2P{! n#" 'Open an output file and write the FRED header data o =F!&]+ Dim outFile As String T( k:\z/ outFile = cDir & sampName & "_FRED.txt" 6)FM83zk)K Open outFile For Output As #1 vkW;qt}yO Print #1, "type bsdf_data" z5sKV7&\[n Print #1, "format angles=deg bsdf=value scale=1" f917F.1I ?}jjBJ& 'Loop the file list, skip the two header lines and write the remaining data to file EJJ&`,q Dim lineArray() As String, curLine As Long }/g1 For Each curFile In fList Hl8\*#;C&> Print "Merging data from file " & curFile cCIs~*D ReadFile( cDir & curFile, lineArray ) akwS;|SZ For curLine = 2 To UBound(lineArray) 6^FUuj. Print #1, lineArray(curLine) "L9pFz</ Next 6c}nP[6| Next 9'KOc5@l^ 1J&hm[3[K 'Close the output file 0,iG9D7 Close #1 Qr?(2t# 7'@~TM Print "Finished merging RPC data for sample " & sampName Ju.T.)H Print "FRED formatted data file: " & Chr(9) & outFile nzU0=w}V End Sub ZKi?;ta= 8P2_/)| 'Utility function to read the contents of a file into an array of strings. '2{60t_A Function ReadFile(ByVal fileName As String, _ T'N/A9{q ByRef lineArray() As String) As Long |1T[P)Q R]o2_r7N"} ReadFile = -1 P+ 0-h Dim oFSO As Object cWI7];/d; Set oFSO = CreateObject("Scripting.FileSystemObject") $tK/3 Erase lineArray :r&4/sN}< c2d1'l]n Dim fid As Long ETfoL.d$( If oFSO.fileexists( fileName ) Then xI~ c~KC fid = FreeFile() @X_)%Y-^O Open fileName For Input As fid `<%
w4E lineArray = Split(Input(LOF(fid), fid), vbCrLf) ,LL=b-Es Close fid jW}hLjlN End If [Fr <tKtB Set oFSO = Nothing qc6d,z/ Return UBound( lineArray ) ^5-SL?E sT91>'& End Function <In+V 0EC/l
OS Sub GetFileList( ByVal in_dir As String, _ yeV|j\TJI. ByRef in_flist() As String ) /qd~|[Kx: P>7PO~E. 'Redimension the file list array ?6:e%YT Erase in_flist IY|>'}UU# s6I/%R3 'Tracks how many files are found e ,A9N%M Dim fCount As Long D]K?ntS[* fCount = 0 OL623jQX pAcu{5#7 'Recurse directory and search for text files AHLXmQl Dim f As String U@)WTH6d f = Dir$(in_dir & "*.txt") =AeOkie While f <> "" \%.&$z3wz ReDim Preserve in_flist(fCount) RNX>I,2sh in_flist(fCount) = f <@qJsRbhK fCount += 1 ?lIh&C8]X f = Dir$() 8ZDWaq8^2N Wend gy/bA ReDim Preserve in_flist(fCount-1) &"X1w $ p%e/>N.P End Sub 4TaHS!9
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