FF6[qSV 摘要: oqB(l[%z2 rV)mcfw:Z 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。 gpVZZ:~ mEv<r6qDT 背景: 9xyj,;P> 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。 d3_aFsQ 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。图1. RPC Photonics工程漫射体结构及光束投射形状 dE^:-t IUAx*R r#JE7uneT s[NkPh9& 步骤 $FZ~]Ef "n,"> 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 m{x[q 图2. RPC Photonics工程漫射体不同类型的散射数据 zJ93EtlF ?<]BLkx 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) _,"T;i 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 w<<>XIL 例如下所示: v{$X2z_$w Sample name: EDF-C1-56 21bvSK Merging data from file EDF-C1-56 0-0.txt U2 Finished merging RPC data for sample EDF-C1-56 wUW^
O FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q4Zuz)r* 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 X#'DS&{ a. 创建一个新的散射库 )."_i64 b. 散射模型命名 YD
H!Nl c. 改变散射模型为“Tabulated BSDF”. m.pB]yq& 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 ) KPSFy< 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。 UBzX%:A 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, Fm_^7| g. 点击OK ? [l[y$9 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 /17Qhex ^[,Q2MHCT( :f
G5?]) 脚本代码: _t||v K#_&}C^-jY '#Language "WWB-COM" t'|A0r$ L15?\|':Y Option Explicit 3p6QJuSB rn $a)^! Sub Main xHq"1Vs= "XlNKBgM 'Cleanup GPz0qK ClearOutputWindow() n^B9Mh@ C-E~z{ Print "Merging RPC Photonics BSDF Data Files" c[J?`8 SetTextColor(255,0,0) GK.^Gd Print "Note: Script should be located in the same folder as the BSDF TXT files." b3F)$UQ Print "Note: Do not run this script multiple times without deleting the output file between executions." :7UC=GKQk SetTextColor(0,0,0) Yz]c'M@ ADK)p? 'Current directory of this script (should be the same as the text files being merged) `qnp Dim cDir As String Z^E>)!t cDir = MacroDir$ & "\" <*EMcZ Swz{5 J2C 'Array which will be populated with the list of files to be merged )UbPG`x8 Dim fList() As String, curFile As String $9+|_[ ]v. GetFileList( cDir, fList ) |0ATH`{ g xY6 M4 Print "" 94VtGg=b} Print "Files found for merging:" 3.+TM]RYN For Each curFile In fList [p3{d\=*? Print Chr(9) & curFile m:B9~lbT+ Next vZ,DJ//U, `NYu|:JK: 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 60,z! Vv Dim nameArray() As String, sampName As String 2(LF @xb nameArray = Split(fList(0)," 0-0.txt") @W}cM sampName = nameArray(0) 'yxN1JF Print "" H3-(.l[!b) Print "Sample name: " & Chr(9) & sampName [As9&]Bv5 Zc 9@G- 'Open an output file and write the FRED header data <G|i!Pm Dim outFile As String _PT5 outFile = cDir & sampName & "_FRED.txt" 9d&@;&al Open outFile For Output As #1 YBh|\ Print #1, "type bsdf_data" aItQ(+y Print #1, "format angles=deg bsdf=value scale=1" '
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_TFTO GWFF.Mo^ 'Loop the file list, skip the two header lines and write the remaining data to file V=^B7a.;> Dim lineArray() As String, curLine As Long F!7dGa$ For Each curFile In fList ezimQ Print "Merging data from file " & curFile Jq>rA ReadFile( cDir & curFile, lineArray ) Vu.VH([b]Q For curLine = 2 To UBound(lineArray) O6*2oUKqK Print #1, lineArray(curLine) M[ {O%! Next "DaE(S& Next Zt_~Zxn3 m`i_O0T 'Close the output file u7&q(Z&&O Close #1 &Va="HNKt <OY (y#x Print "Finished merging RPC data for sample " & sampName q QcQnd2K Print "FRED formatted data file: " & Chr(9) & outFile e"oTlB End Sub /RVwhA+c '0-YFx'U0V 'Utility function to read the contents of a file into an array of strings. umT * Function ReadFile(ByVal fileName As String, _ Gj_7wP$ ByRef lineArray() As String) As Long >$$z 6A[ /< k&[ ReadFile = -1 y1{TVpN Dim oFSO As Object P ~ :
N Set oFSO = CreateObject("Scripting.FileSystemObject") 6ChFsteGFr Erase lineArray U$yy7}g 8Y4mTW Dim fid As Long GP>\3@> If oFSO.fileexists( fileName ) Then hrNB"W|?x fid = FreeFile() s$% t2UaV Open fileName For Input As fid !"2S'oQKS lineArray = Split(Input(LOF(fid), fid), vbCrLf) Hf/ZaBn Close fid |\zzOfaO End If |v:oLgUdH Set oFSO = Nothing }!Y=SP1e Return UBound( lineArray ) l~]D|92 <Y]e End Function ;NOmI+t0w& .k:heN2-x Sub GetFileList( ByVal in_dir As String, _ },n? ByRef in_flist() As String ) ?g\emhG nb<e<>L 'Redimension the file list array rD+mI/_J` Erase in_flist h1t~hrq wz'= 'Tracks how many files are found =t^jlb Dim fCount As Long 8.,d`~ fCount = 0 TZ63=m ?7>"ZGDe> 'Recurse directory and search for text files 5cGQ `l Dim f As String ?K+q~DzNSD f = Dir$(in_dir & "*.txt") b)@D@K"5 While f <> "" 4O{G^; ReDim Preserve in_flist(fCount) cYp/? \ in_flist(fCount) = f a^={X<K|/ fCount += 1 It7R}0Smg f = Dir$() UX+vU@Co[ Wend %x.du9 ReDim Preserve in_flist(fCount-1) |