$OdBuJA 摘要: 7l$
u.[ q?Csm\Y 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。 Ha|}Oj
2"?D aX 背景: #) :.1Z? 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。 f,E7eL@ 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 gSw4\ R 7I'C'.6iM $/C1s"C@O .MG83Si 步骤 UO&$1rV tuIZYp8tIN 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 =k.%#h{ 图2. RPC Photonics工程漫射体不同类型的散射数据 ZIa,pON =?0v,;F9| 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) te2vv]W1 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 2b"DkJj' 例如下所示: d1\nMm}v Sample name: EDF-C1-56 G 3,v'D5 Merging data from file EDF-C1-56 0-0.txt ]"HaE-`% Finished merging RPC data for sample EDF-C1-56 ~a[/l FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt #:0-t!<0C 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 aIFlNS,y a. 创建一个新的散射库 n<j+KD#a b. 散射模型命名 3.?be.cq c. 改变散射模型为“Tabulated BSDF”. &l7E|.JE d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) z9[TjTH^}T e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 yD7} f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, ap )B%9 g. 点击OK ~qeFSU( 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 5Y^"&h[/ :=;{w~D z/xPI)R[ 脚本代码: !2.BLJE> "E\mj'k '#Language "WWB-COM" f\dfKNm6 [Cv./hEQi Option Explicit SDil\x =/46;844T Sub Main F""9O6u Rv9jLH 'Cleanup wxo ClearOutputWindow() 9;U?_ ]5S`y{j1 Print "Merging RPC Photonics BSDF Data Files" 0GrM:Lh y SetTextColor(255,0,0) Na/Y1RW Print "Note: Script should be located in the same folder as the BSDF TXT files." |A'I!Jm Print "Note: Do not run this script multiple times without deleting the output file between executions." RSym9t90t SetTextColor(0,0,0) *"8Ls0! 9% T"W 'Current directory of this script (should be the same as the text files being merged) K-C,n~- Dim cDir As String (?\+ cDir = MacroDir$ & "\" rMx Iujx `9K5 ;] 'Array which will be populated with the list of files to be merged 6EyPZ{ Dim fList() As String, curFile As String )Q
=>7%ZA GetFileList( cDir, fList ) $!.>)n @!f4>iUy Print "" l(sVnhL6h Print "Files found for merging:" /VT/KT{ For Each curFile In fList p
4>ThpX Print Chr(9) & curFile $q@d.Z>; Next ^-~JkW'z UrvUt$WO 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. KN|<yF Dim nameArray() As String, sampName As String mfQ#n!{ZH nameArray = Split(fList(0)," 0-0.txt") 8-nf4=ll sampName = nameArray(0) <@-O06 Print "" gfg,V.: Print "Sample name: " & Chr(9) & sampName B]"`}jn R}Lk$#S# 'Open an output file and write the FRED header data ( *+'k1Ea Dim outFile As String V[nPTYO4 outFile = cDir & sampName & "_FRED.txt" )FQ"l{P Open outFile For Output As #1 1z-.e$&z Print #1, "type bsdf_data" xGwImF$r Print #1, "format angles=deg bsdf=value scale=1" lWId
0eNS _ Ncbo#G 'Loop the file list, skip the two header lines and write the remaining data to file [v"Z2F<.= Dim lineArray() As String, curLine As Long ;yt6Yp.6e For Each curFile In fList SU ~a()" Print "Merging data from file " & curFile ! dzgi: ReadFile( cDir & curFile, lineArray ) >s{I@#9 For curLine = 2 To UBound(lineArray) njy2pDC@ Print #1, lineArray(curLine) Iy9hBAg\y Next ={:a
N) Next 2H|:/y .c"nDCFVR 'Close the output file }]vUr}Els Close #1 %PYl dM-cQo: Print "Finished merging RPC data for sample " & sampName |
;tH?E Print "FRED formatted data file: " & Chr(9) & outFile r<+C,h;aww End Sub (gBKC]zvz3 'cs(gc0 'Utility function to read the contents of a file into an array of strings. !LN8=u. Function ReadFile(ByVal fileName As String, _ !2LX+*; ByRef lineArray() As String) As Long ~wb1sn3 =:WZV8@% ReadFile = -1 O^@8Drgc Dim oFSO As Object p'/\eBhG]= Set oFSO = CreateObject("Scripting.FileSystemObject") Y.viOHL Erase lineArray g<:Lcg"u _
>OP Dim fid As Long RPz[3y If oFSO.fileexists( fileName ) Then 7]h %?W! fid = FreeFile() y*i&p4Y* Open fileName For Input As fid t}q
e_c lineArray = Split(Input(LOF(fid), fid), vbCrLf) ;28d7e} Close fid u;`]U$Qq9 End If i1
E|lp) Set oFSO = Nothing (0$~T}lH Return UBound( lineArray ) Tru{8]uMH W>@ti9\t End Function &GP(yj] d9f7 & Sub GetFileList( ByVal in_dir As String, _ \H] |5fp* ByRef in_flist() As String ) 7OV^>"S tDK@?PfKz 'Redimension the file list array v ccH(T Erase in_flist k"N>pjgd$ r6DLShP-Ur 'Tracks how many files are found sU_K^=6* Dim fCount As Long PF{uaKWk fCount = 0 s.2f'i+ Dp'urf\*$ 'Recurse directory and search for text files )pWgt5:7~ Dim f As String !7N:cx'Qy f = Dir$(in_dir & "*.txt") sf>
E While f <> "" s6`E.Eevm ReDim Preserve in_flist(fCount) .hT>a< in_flist(fCount) = f "<CM'R fCount += 1 F]$ Nu f = Dir$() m%HT)`>bg Wend ^)AECn ReDim Preserve in_flist(fCount-1) |