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摘要: c (_oK ? Jq$6$A,f 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。 j?Jd@(*y$ [Ls2k&)0 背景: utFcFdX 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。 J*^,l`C/ 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。 32)&; 图1. RPC Photonics工程漫射体结构及光束投射形状 r(?'Y y Le#E! sU /
%U~lr 步骤 @wAr[.lZ l1iF}>F2 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。 sJjl)Qs)T /pSUn"3 图2. RPC Photonics工程漫射体不同类型的散射数据 EP*["fx 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) 8h@)9Q]d\ 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 r['=a/.C 例如下所示: ,h5-rw' Sample name: EDF-C1-56 5,=B1 Merging data from file EDF-C1-56 0-0.txt ^8f|clw" Finished merging RPC data for sample EDF-C1-56 *Wuctu^9 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt nIN%<3U2 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 NdXy%Q a. 创建一个新的散射库 QB.*R? A b. 散射模型命名 e{rHO,#A> c. 改变散射模型为“Tabulated BSDF”. 4Q`=t&u 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 ) q!9v}R3( 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。 \4`saM /x 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, JK^B +. g. 点击OK bTo@gJkn 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Zc' >}X[G Z%HEn$t ^&Rxui 脚本代码: )2^/?jK Oa_o"p<Lr '#Language "WWB-COM" 2*7s9g #QyK?i* Option Explicit 61Iy{-/ZV ym,Ot1 Sub Main UV
*tO15i ZjI/zqBm 'Cleanup V~uA(3\U ClearOutputWindow() p?`|CE@h7 ,ovv Print "Merging RPC Photonics BSDF Data Files" ]Buk9LTe SetTextColor(255,0,0) lWyP[>* Print "Note: Script should be located in the same folder as the BSDF TXT files." JXy667_ Print "Note: Do not run this script multiple times without deleting the output file between executions." uB#B\i SetTextColor(0,0,0) p TV@nP 4f @\f7\ 'Current directory of this script (should be the same as the text files being merged) 5,
"^"*@< Dim cDir As String {'K;aJ'\ cDir = MacroDir$ & "\" {;(g[H=q; [k&s!Qp 'Array which will be populated with the list of files to be merged 5z(>4 d! Dim fList() As String, curFile As String 1n5e^'z GetFileList( cDir, fList ) h
C`p<jp/ d`q)^ Print "" XL&eJ Print "Files found for merging:" Fi3(glgd- For Each curFile In fList \$\(9!= Print Chr(9) & curFile {msB+n~WZ Next !L.z4n,n+ O@(.ei*HJ! 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. u1|Y;* Dim nameArray() As String, sampName As String Z We$(? nameArray = Split(fList(0)," 0-0.txt") $O</akn; sampName = nameArray(0) Ckl]fy@D} Print "" A)p!w aG Print "Sample name: " & Chr(9) & sampName s8I77._s !=Vh2UbC3 'Open an output file and write the FRED header data w!h{P38 Dim outFile As String 3SB7)8Id1 outFile = cDir & sampName & "_FRED.txt" _<~Vxz9 Open outFile For Output As #1 :tDGNz*zG Print #1, "type bsdf_data" /s0VyUV= Print #1, "format angles=deg bsdf=value scale=1" q\pc2Lh?^ :V1ZeNw 'Loop the file list, skip the two header lines and write the remaining data to file x)sDf!d4bi Dim lineArray() As String, curLine As Long *x`l1o For Each curFile In fList 7X3l&J2C4l Print "Merging data from file " & curFile [x()^{;2 ReadFile( cDir & curFile, lineArray ) ^@w1Z{: For curLine = 2 To UBound(lineArray) |0pBBDw Print #1, lineArray(curLine) NU\t3JaR Next $gtT5{"PN( Next Z5^UF2`Q /(L1!BPP9m 'Close the output file g_!xO2LH,8 Close #1 .BTT*vL- ~#x!N=q Print "Finished merging RPC data for sample " & sampName &aht K}u Print "FRED formatted data file: " & Chr(9) & outFile \Nn%*?f End Sub w`Aw+[24 Oua/NF) 'Utility function to read the contents of a file into an array of strings. :[?o7%" Function ReadFile(ByVal fileName As String, _ &T.P7nJ= ByRef lineArray() As String) As Long rpI7W?hh rca"q[, ReadFile = -1 g/Nj|:3 Dim oFSO As Object mZ&Mj.0+~ Set oFSO = CreateObject("Scripting.FileSystemObject") ]6 7wk Erase lineArray 83(P_Y: ,
&f20o Dim fid As Long I8>1RXz If oFSO.fileexists( fileName ) Then b#'a4j-u fid = FreeFile() ] ]-0RJ=S? Open fileName For Input As fid H~K2`Cr)4 lineArray = Split(Input(LOF(fid), fid), vbCrLf) x%7x^]$ Close fid
]b$,.t5 End If ~
a&j4E Set oFSO = Nothing Yx/~8K_%M? Return UBound( lineArray ) 'bO? =+c J4^cd End Function ;lt;]7 At|tk Sub GetFileList( ByVal in_dir As String, _ ^0~1/ PhOw ByRef in_flist() As String ) a5S/
O;ry /Bu5kBC 'Redimension the file list array xeh|u"5 Erase in_flist v0J1%{/xs
';V+~pi 'Tracks how many files are found 6Ky"4\e Dim fCount As Long daNIP1Qn fCount = 0 2DQC)Pe+z iKKWn*u 'Recurse directory and search for text files #-,`4x$m| Dim f As String 1mM52q.R4 f = Dir$(in_dir & "*.txt") ]TOY_K8"z# While f <> "" D:,<9 %A ReDim Preserve in_flist(fCount) &Wk<F3qN in_flist(fCount) = f =h!m/f^x fCount += 1 #| Po&yu4R f = Dir$() A*i_-;W) Wend zvj >KF|y ReDim Preserve in_flist(fCount-1) J[AgOUc ti%
e.p0[ End Sub )G gx
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