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摘要: y fS S +73 /Vs 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。 Ax!@vL&@ rA_r$X 背景: odcrP\S 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。 .b*-GWx 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。 pek5P4W_ 图1. RPC Photonics工程漫射体结构及光束投射形状 h*[sV 2I4G=jM[ ac4dIW{$3 步骤 r_a1oO: ;P|v'NNI 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 .$x822
%s%e5hU 图2. RPC Photonics工程漫射体不同类型的散射数据 6Vu??qBy 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) ,n5 [Y) 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 5bK:sht 例如下所示: =PBJ+"DQs Sample name: EDF-C1-56 '_=XfTF Merging data from file EDF-C1-56 0-0.txt "0"8Rp&V| Finished merging RPC data for sample EDF-C1-56 =6w(9O FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt BS3BJwf;
f 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 i6h0_q8
> a. 创建一个新的散射库 DGAg#jh b. 散射模型命名 TU8K\;l] c. 改变散射模型为“Tabulated BSDF”. N;,N6&veK/ 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 ) E[_-s 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。 v[y|E;B 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, !. ={p8X-x g. 点击OK W.b?~ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 TlBu3z'P "l09Ae'V OEN'c0;5 脚本代码: xF9PjnWF= +Mh 9Jf '#Language "WWB-COM" +@oo8io [SLBA_d Option Explicit _UeIzdV9 h@?BA<'S Sub Main )N&v.w {I_I$x_ 'Cleanup ^Ul*Nm
ClearOutputWindow() [+$o`0q;N? 8|#p D4e Print "Merging RPC Photonics BSDF Data Files" (kI@U![u SetTextColor(255,0,0) ~rU{Q>c Print "Note: Script should be located in the same folder as the BSDF TXT files." QVrMrm+vRv Print "Note: Do not run this script multiple times without deleting the output file between executions." ze%)fZI0f SetTextColor(0,0,0) J$<g"z3 5/{gY{ 'Current directory of this script (should be the same as the text files being merged) )wYbcH Dim cDir As String 1G+?/w cDir = MacroDir$ & "\" ep"54o5=d u>-!5=D8 'Array which will be populated with the list of files to be merged bQM_rqjJGw Dim fList() As String, curFile As String 3~!PJI1 GetFileList( cDir, fList ) 9Ic~F^ w,FOq?j^k Print "" @oL<Ioh Print "Files found for merging:" XmoS$/#" For Each curFile In fList bMw)>4 Print Chr(9) & curFile PUViTb Next `5Qo*qx (yel 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 8.Ty
,7Z Dim nameArray() As String, sampName As String M 9b_Q nameArray = Split(fList(0)," 0-0.txt") L$+ap~ld sampName = nameArray(0) q
y8=4~40 Print "" aTy&" Print "Sample name: " & Chr(9) & sampName P1
`-OM 9f4#b8 'Open an output file and write the FRED header data =r:-CRq( Dim outFile As String 7L:$Amb_F outFile = cDir & sampName & "_FRED.txt" pJ#R :#P Open outFile For Output As #1 ,2%> e"% Print #1, "type bsdf_data" uNYHEs6%T$ Print #1, "format angles=deg bsdf=value scale=1" B6b {hsO x+9aTsZ 'Loop the file list, skip the two header lines and write the remaining data to file [Hww3+~+ Dim lineArray() As String, curLine As Long tXTa>Q For Each curFile In fList =e,2/Ep{i Print "Merging data from file " & curFile 5sq#bvfJ o ReadFile( cDir & curFile, lineArray ) G =+ sW For curLine = 2 To UBound(lineArray) a[GlqaQy+- Print #1, lineArray(curLine) B/Lx, Next NY
ZPh%x Next r,x;q +'x`rk 'Close the output file 'N0/;k0ax Close #1 E0}jEl/{ <c6C+OWT, Print "Finished merging RPC data for sample " & sampName }_L@CpG Print "FRED formatted data file: " & Chr(9) & outFile V<@]Iv End Sub X] /r'Tz (6G5UwSt 'Utility function to read the contents of a file into an array of strings. KutR l$, Function ReadFile(ByVal fileName As String, _ C/+8lA6NV ByRef lineArray() As String) As Long jv]:`$}G\ mYN|)QVKy ReadFile = -1 #{l+I(M Dim oFSO As Object G~e`O,+ Set oFSO = CreateObject("Scripting.FileSystemObject") Ng,#d`Br Erase lineArray *"Ipu"G5? ?zN v7Bj Dim fid As Long 9\i,3:Qc If oFSO.fileexists( fileName ) Then R
gEKs"e fid = FreeFile() d]k>7. Open fileName For Input As fid Kl$!_ $ lineArray = Split(Input(LOF(fid), fid), vbCrLf) *IGgbg[0 Close fid K{HRjNda# End If -iS\3P. Set oFSO = Nothing 8+uwzBNZ: Return UBound( lineArray ) 0@t/j< |