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摘要: &Ay[mZQ 7 0tb%h[%,M 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。 [QZ g=." m(DJ6CSa 背景: 4Fs5@@>X 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。 2*)2c[/0F 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。 6>=yX6U1q^ 图1. RPC Photonics工程漫射体结构及光束投射形状 1~aP)q HY!R | p()#+Xy 步骤 9S_PZH 4-vo R5Fd 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。 oo4aw1d 8gn12._x 图2. RPC Photonics工程漫射体不同类型的散射数据 `WRM7 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) oqUF_kh 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 !> 2kH 例如下所示: tPqWe2 Sample name: EDF-C1-56 1LZ[i89&% Merging data from file EDF-C1-56 0-0.txt O3K TKL] Finished merging RPC data for sample EDF-C1-56 JG/Pc1aK FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt :}* 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 $s]vZ(H a. 创建一个新的散射库 )sZJH9[K b. 散射模型命名 c$P68$FB c. 改变散射模型为“Tabulated BSDF”. OC=g 1 d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) hH(w O\s e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ,7h0y f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, !fmbm4!a
g. 点击OK KBOp}MEz 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 H~:EPFi.( a${<~M
hm 1tIJ'#6 脚本代码: C116c" riv8qg '#Language "WWB-COM" d+o.J",E mJNw<T4!/ Option Explicit 'zhv#&O 3ZUME\U Sub Main ISHzlEY xQ,My 'Cleanup \)`OEGdOR\ ClearOutputWindow() 7SJR_G6,{ =n<Lbl(7 Print "Merging RPC Photonics BSDF Data Files" YN}vAFR` SetTextColor(255,0,0) 38#Zlcf Print "Note: Script should be located in the same folder as the BSDF TXT files." u*=8s5Q[ Print "Note: Do not run this script multiple times without deleting the output file between executions." H! P$p-*. SetTextColor(0,0,0) o]M1$)>b+ c> 0R_ 'Current directory of this script (should be the same as the text files being merged) ,n3e8qd Dim cDir As String x/dyb. cDir = MacroDir$ & "\" ^). Qg]+&8!* 'Array which will be populated with the list of files to be merged Mz 6PH)e; Dim fList() As String, curFile As String 0,whTnH| GetFileList( cDir, fList ) \,S4-~(:! ]{|
wU. Print "" f]48-X,^6 Print "Files found for merging:" `?G&w.Vs For Each curFile In fList BUS4 T#D Print Chr(9) & curFile U#Wg"W{ Next 46##(4RF =Hbf()cN) 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. v>0I=ut Dim nameArray() As String, sampName As String C2{*m{
D nameArray = Split(fList(0)," 0-0.txt") _9C,N2a{C sampName = nameArray(0) v\o
m Print "" Y'<wE2ZL) Print "Sample name: " & Chr(9) & sampName }jg1..)"< $0Ys{m 'Open an output file and write the FRED header data !oa/\p Dim outFile As String F0kdwN4; outFile = cDir & sampName & "_FRED.txt" 5.$/]2VK Open outFile For Output As #1 xLSf
/8e Print #1, "type bsdf_data" E#R1 Print #1, "format angles=deg bsdf=value scale=1" [/o BjiBA 9ZNzC
i! 'Loop the file list, skip the two header lines and write the remaining data to file H'+3<t> Dim lineArray() As String, curLine As Long lVCnu>8 For Each curFile In fList q|V|Jl Print "Merging data from file " & curFile =o4gW`\z ReadFile( cDir & curFile, lineArray ) WjguM For curLine = 2 To UBound(lineArray) ~BiLzT1, Print #1, lineArray(curLine) OS-k_l L Next ,BFw-A Next M`n0
qy #(QS5J&Qq 'Close the output file t$
97[ay Close #1 vi.INe @/,0()* dL Print "Finished merging RPC data for sample " & sampName Dn)B19b Print "FRED formatted data file: " & Chr(9) & outFile Id1de>:; End Sub ^WF_IH& Oy b0t|do+ 'Utility function to read the contents of a file into an array of strings. M@JW/~p' Function ReadFile(ByVal fileName As String, _ Hy5 6@jW+E ByRef lineArray() As String) As Long 8DX5bB `=S%!akj ReadFile = -1 Zv2]X- Dim oFSO As Object eLLOE)x Set oFSO = CreateObject("Scripting.FileSystemObject") W[sQ_Z1C Erase lineArray +koW3> $4*gi& Dim fid As Long O0;mXH If oFSO.fileexists( fileName ) Then 3?D{iMRM fid = FreeFile()
`n@;%*6/ Open fileName For Input As fid * =*\w\
te lineArray = Split(Input(LOF(fid), fid), vbCrLf) gF`hlYD Close fid `6RccEm End If X"vDFE`? Set oFSO = Nothing ~k%XW$cV Return UBound( lineArray ) V CVKh !Na@T]J End Function X,c`,B03 L)8%*X Sub GetFileList( ByVal in_dir As String, _ 97 ,Y q3 ByRef in_flist() As String ) (&u'S+ Ls+vWfF=# 'Redimension the file list array @REMl~"D5 Erase in_flist T9'HQu JP(0/?Q 'Tracks how many files are found ZvLI~ul(zT Dim fCount As Long q&}+O fCount = 0 _8ks`O#} >3*a&_cI=k 'Recurse directory and search for text files .s?^y+e_ Dim f As String R T~oJ~t; f = Dir$(in_dir & "*.txt") A2p% Y}, While f <> "" f]mVM(XZN ReDim Preserve in_flist(fCount) 9-vQn/O^D in_flist(fCount) = f oIQ$98 M fCount += 1 6y "]2UgQk f = Dir$() %eh.@8GL` Wend B~M6l7^? ReDim Preserve in_flist(fCount-1) 2G<XA H:
;XU End Sub ggrkj0
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