RPC Photonics扩散片BSDF

7nNNc[d*=   RPC Photonics扩散片BSDF

时间:2016-01-08 23:10来源:讯技光电作者: 技术部点击:次打印

;p2b^q'   摘要： I 1n,c d[   )=sbrCl,C/   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。 ' Ut4=@)   }% f7O   背景： iMt3h8   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。 PxgJ7d   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 5@%.wb4   T\n6^@. >   r88De=*   g0bYO!gCr   步骤 nj0sh"~+   5wmd[YL   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。 O>pv/Ns   图2. RPC Photonics工程漫射体不同类型的散射数据 FLs$   @J&korU   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） C+uW]]~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  *<W8j[?   例如下所示： ]VxC]a2   Sample name:  EDF-C1-56 _crhBp5@T3   Merging data from file EDF-C1-56 0-0.txt SF&2a(~s   Finished merging RPC data for sample EDF-C1-56 g\fj6   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt bq9w@O   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 s:7/\h   a. 创建一个新的散射库 tnaFbmp   b. 散射模型命名 'Gqv`rq&   c. 改变散射模型为“Tabulated BSDF”. %2T i Rb   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 ） E0R6qS:'   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。 #kASy 2t   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， ?9a%g\`?:   g. 点击OK ' Zp{   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 Fu_I0z   fC x(   Ac|\~w[\   脚本代码： J6n>{iE   cu($mjC@T   '#Language "WWB-COM" }1e4u{   Z.Yq)\it   Option Explicit q6)fP4MQ]   jZzTnmm&?   Sub Main GM0 Q@`d   xy[#LX)RW       'Cleanup /3,Lp-kp       ClearOutputWindow() q:/df]Ntt   N=BG0t$       Print "Merging RPC Photonics BSDF Data Files" '1:)q       SetTextColor(255,0,0) /j$=?Rp       Print "Note: Script should be located in the same folder as the BSDF TXT files." GeTk/tU       Print "Note: Do not run this script multiple times without deleting the output file between executions." a&x:_vv       SetTextColor(0,0,0) IgG[Pr'D   v^b4WS+.:       'Current directory of this script (should be the same as the text files being merged) :R,M Y"(       Dim cDir As String 6sSwSS       cDir = MacroDir$ & "\" yl~_~<s6   Mg.%&vH\       'Array which will be populated with the list of files to be merged ^iMr't\b       Dim fList() As String, curFile As String h<U?WtWT-p       GetFileList( cDir, fList ) &7f8\TG|   m4 (pMrJ       Print "" O`9c!_lis       Print "Files found for merging:" `SFeln{1B       For Each curFile In fList >MHlrSH2           Print Chr(9) & curFile 3&+dyhL'w       Next  /ooGyF   &rBe -52       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ::oFL#+       Dim nameArray() As String, sampName As String Y=P*        nameArray = Split(fList(0)," 0-0.txt") Ev5~= ]       sampName  = nameArray(0) 0I)$!1~O)       Print "" +:.Jl:fx4       Print "Sample name: " & Chr(9) & sampName aDKb78 1d   p H y       'Open an output file and write the FRED header data K:a8}w>Up       Dim outFile As String q++r\d^{       outFile = cDir & sampName & "_FRED.txt" js<d"m*       Open outFile For Output As #1 xmv%O&0^}       Print #1, "type bsdf_data" ;7lON-@BI       Print #1, "format angles=deg bsdf=value scale=1" wQ/* f9   CJ\a7=*i       'Loop the file list, skip the two header lines and write the remaining data to file )x|;%.8FX7       Dim lineArray() As String, curLine As Long NS[eQ_rT       For Each curFile In fList v_!6S|           Print "Merging data from file " & curFile s$R /!,c           ReadFile( cDir & curFile, lineArray )  l(?B0           For curLine = 2 To UBound(lineArray) G%erh}0~               Print #1, lineArray(curLine) H2s:M           Next X_TjJmc       Next f8]sjeY   [tpiU'/Zl       'Close the output file by @KdQow       Close #1 "CT}34l   \Fz9O-jb4       Print "Finished merging RPC data for sample " & sampName S/'0czDMW       Print "FRED formatted data file: " & Chr(9) & outFile )hZ7`"f,ZN   End Sub {cm?Q\DT   j,M$l mR')   'Utility function to read the contents of a file into an array of strings. MxsLrWxm   Function ReadFile(ByVal fileName As String, _ t1FtYXv`/                     ByRef lineArray() As String) As Long j>\c >U   /MF 7ZvN.       ReadFile = -1 V)^Xz8H_       Dim oFSO As Object egaX[j r       Set oFSO = CreateObject("Scripting.FileSystemObject") jSY[Y:6md       Erase lineArray 1>J.kQR^   M~taZt4       Dim fid As Long ENTcTrTn       If oFSO.fileexists( fileName ) Then 7ftn gBv?           fid = FreeFile() PftK>,+,           Open fileName For Input As fid G?W:O{n3           lineArray = Split(Input(LOF(fid), fid), vbCrLf) /f3/}x!po           Close fid 2LwJ%!       End If ?"x4u#x       Set oFSO = Nothing V?u#WJy/       Return UBound( lineArray ) QtW9!p7(   Je6[q   End Function b#6S8C+@   ipv5JD[   Sub GetFileList( ByVal in_dir As String, _  Z1 D                    ByRef in_flist() As String ) YXA@ c   O?e9wI=H       'Redimension the file list array {*yvvb       Erase in_flist _?c.m*)A   L`+[mX&2B       'Tracks how many files are found }_D.Hy5       Dim fCount As Long <0CjEsAB]       fCount = 0 mU/o%|h   o:d7IL       'Recurse directory and search for text files ?@b6(f xX       Dim f As String `|'w]rj:"+       f = Dir$(in_dir & "*.txt") V\L;EHtc$       While f <> "" tu -a`h_NJ           ReDim Preserve in_flist(fCount) j6qtR$l|           in_flist(fCount) = f kKyU?/aj           fCount += 1 $plk>Khg           f = Dir$() 7Nq< o5       Wend h.\I tK{)       ReDim Preserve in_flist(fCount-1)