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摘要: K.6xNQl{} yrR,7vJ 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。 /I q6'oo |B@\Nf7 背景: 0I>[rxal 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。 {`[u XH?3d 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。 &$_#{?dPt 图1. RPC Photonics工程漫射体结构及光束投射形状 h)yAge MY>o8A J<7nOB}OD 步骤 eHI7= [h }m-+EUEo9 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 `T$CUlt6 {;Y2O.lV 图2. RPC Photonics工程漫射体不同类型的散射数据 A(qy>x-BI 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) OYNPZRu 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 Twr<MXa 例如下所示: HVcd< :g0 Sample name: EDF-C1-56 /'>#1J|TlK Merging data from file EDF-C1-56 0-0.txt 'B$qq[l]S Finished merging RPC data for sample EDF-C1-56 ,W~a%8* FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt YW)&IA2 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 5y|/}D> a. 创建一个新的散射库 28PT19& b. 散射模型命名 C<\O;-nHH c. 改变散射模型为“Tabulated BSDF”. L\H,cimN d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) EU-=\Y e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 qUF}rlS=r f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, c{s%kVOzg g. 点击OK -!z,t7! 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 06S-3bis [1 gWc`# K~Hp%. 脚本代码: QBfsdu<@^ H0\5a|X- '#Language "WWB-COM" a).bk!G ~T<o?98 Option Explicit )mMHwLDwH ,V2,FoJ 9 Sub Main ?Wm.'S'to :3Hr:~ 'Cleanup 5n'C6q " ClearOutputWindow() .I&]G i@}/KT Print "Merging RPC Photonics BSDF Data Files" Lz'05j3! SetTextColor(255,0,0) 7-hSso.' Print "Note: Script should be located in the same folder as the BSDF TXT files." -hIDL'5u-I Print "Note: Do not run this script multiple times without deleting the output file between executions." Ju"*>66 SetTextColor(0,0,0) NbtNu$%t h&}XG\ioNA 'Current directory of this script (should be the same as the text files being merged) gLef6q{} Dim cDir As String XVKR}I cDir = MacroDir$ & "\" @<
@\CiM OJ:iQ 'Array which will be populated with the list of files to be merged wLf=a^c# Dim fList() As String, curFile As String k6vY/)-S GetFileList( cDir, fList ) =c, m)\u/8 Zn`vL52_ Print "" 3tlA!e Print "Files found for merging:" LL1HDG>l For Each curFile In fList c`(] j
w Print Chr(9) & curFile _pv<_
Sm Next [9E<z2H wv8WqYV 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ?=;dNS@i@ Dim nameArray() As String, sampName As String _ ecKX</Q nameArray = Split(fList(0)," 0-0.txt") v<z%\`y sampName = nameArray(0) {-(B Print "" v~N8H+!d Print "Sample name: " & Chr(9) & sampName M#Vl{ b <-:gaA`KM 'Open an output file and write the FRED header data jz_\B(m9% Dim outFile As String `4'['x outFile = cDir & sampName & "_FRED.txt" [C]u!\(IF Open outFile For Output As #1 H"H&uA9" Print #1, "type bsdf_data" B|-E3v:f4 Print #1, "format angles=deg bsdf=value scale=1" `eat7O {VPF2JFB[ 'Loop the file list, skip the two header lines and write the remaining data to file sILkTzsw Dim lineArray() As String, curLine As Long BiQ7r=Dd. For Each curFile In fList R30{/KK Print "Merging data from file " & curFile V3'QA1$ ReadFile( cDir & curFile, lineArray ) ?th`5K30 For curLine = 2 To UBound(lineArray) Xx~XW^lsh Print #1, lineArray(curLine) ]C =+ Next 0?]*-wvp Next BK>uJv-qU z
(,%<oX 'Close the output file rkdwGqG Close #1 piE9qXn tc%?{W\ Print "Finished merging RPC data for sample " & sampName ).0h4oHSj Print "FRED formatted data file: " & Chr(9) & outFile C%8jWc End Sub =X?jId{ `Tx1?] 'Utility function to read the contents of a file into an array of strings. ceDe!Iu Function ReadFile(ByVal fileName As String, _ !tkP!%w ByRef lineArray() As String) As Long -t, .A/? ?3wEO>u ReadFile = -1 @3/.W + Dim oFSO As Object [.O3z*[9# Set oFSO = CreateObject("Scripting.FileSystemObject") UC)-Fd Erase lineArray iol.RszlZ| kETu@la} Dim fid As Long 0^VA,QkQ\ If oFSO.fileexists( fileName ) Then jrGVC2*rD fid = FreeFile() )6# i>c- Open fileName For Input As fid $okGqu8z.O lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0Bx.jx0? Close fid _u$X.5Q; End If 2 w2JFdm Set oFSO = Nothing Yl[GO}M Return UBound( lineArray ) 8-Ik .,}
Fh u(u End Function '"{ IV K8{U b Sub GetFileList( ByVal in_dir As String, _ H]5%"(h ByRef in_flist() As String ) P%hi*0pwZ +@wa?" 'Redimension the file list array A ^YHtJ Erase in_flist <QGf9{m v%(2l|M 'Tracks how many files are found "oX@Z^ Dim fCount As Long 9*gD;) ! fCount = 0 KS($S(Fi &u-H/CU% 'Recurse directory and search for text files FI1R7A Dim f As String Qo>VN`v f = Dir$(in_dir & "*.txt") Yb8o`j+t While f <> "" B[:-SWd ReDim Preserve in_flist(fCount) m&xyw9a in_flist(fCount) = f ` V}e$ fCount += 1 qkpnXQ f = Dir$() @#q>(Ox% Wend IP'gN-#i ReDim Preserve in_flist(fCount-1) P!qU8AJkt N5u.V\F!z\ End Sub q y1$(3t$
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