RPC Photonics扩散片BSDF

E yNCky   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

$h2h&6mH   摘要： u+]zi"k^s   4:K9FqU   RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 L U7.   bv+PbK]iO   背景： 2Bx\nLf/ K   Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 6K,AQ.=V2   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 -1@kt<Es   ;2 U`?"   #PiW\Tq   vnKUD |   步骤 iM\W"OUl[   )!0>2,R1   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 Z*k}I{0,-   图2. RPC Photonics工程漫射体不同类型的散射数据 ?&[`=ZVn   Ts.61Rx   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） *@D.=i>   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 5-MI7I@l   例如下所示： \=w|Zeu{l   Sample name:  EDF-C1-56 V%"aU}    Merging data from file EDF-C1-56 0-0.txt CrK}mbe   Finished merging RPC data for sample EDF-C1-56 M]oaWQu   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ?@tp1?)   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 T8v>J 4@t   a. 创建一个新的散射库 se_1wCYz   b. 散射模型命名 ZM\Z2L]n   c. 改变散射模型为“Tabulated BSDF”. iZ&CE5+   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） ,}J(&   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 \h:$q E7   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， i7iL[+f]Q   g. 点击OK /CH*5w)1    5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 h]I ^%7   Ty7xjIs   -2f_e3jF   脚本代码： mzDbw-#   orJN#0v4   '#Language "WWB-COM" h/5.>[VwDh   >]FRHJo_   Option Explicit li(g?|AD   U4Il1| M&   Sub Main ,|D<De\v&   L_Z>*s&       'Cleanup 3b~k)t4R       ClearOutputWindow() WSUU_^.   7V?TLGgd$       Print "Merging RPC Photonics BSDF Data Files" ih~ R?W       SetTextColor(255,0,0) ttgb"Wb%S       Print "Note: Script should be located in the same folder as the BSDF TXT files." 9[T}cN=|       Print "Note: Do not run this script multiple times without deleting the output file between executions." NU O9,       SetTextColor(0,0,0) yoQ}m/Cj   ',~,hJ0       'Current directory of this script (should be the same as the text files being merged) `i;f       Dim cDir As String ji5c0WH       cDir = MacroDir$ & "\" *{6{ZKM   Zh,(/-XN;       'Array which will be populated with the list of files to be merged r761vtC#       Dim fList() As String, curFile As String oUoDj'JN{       GetFileList( cDir, fList ) s>ilxLSX]   JZB7?@h%       Print "" 4;=+qb       Print "Files found for merging:" qi!+Ceo}       For Each curFile In fList #L ffmS           Print Chr(9) & curFile WTbq)D(&[_       Next 'a[|'   f<?v.5($       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. +K{J * n       Dim nameArray() As String, sampName As String JYc;6p$<i       nameArray = Split(fList(0)," 0-0.txt") m5`<XwD9       sampName  = nameArray(0) ]2Zl\}GwY       Print "" ?NWc3 .       Print "Sample name: " & Chr(9) & sampName V^apDV\AV   DxoW,GW       'Open an output file and write the FRED header data lk;4l Z       Dim outFile As String hT go       outFile = cDir & sampName & "_FRED.txt" aYW9C<5       Open outFile For Output As #1 @Jr:+|v3B       Print #1, "type bsdf_data" /fv;`?~d*       Print #1, "format angles=deg bsdf=value scale=1" ^ZuwUuuf   C%H{"       'Loop the file list, skip the two header lines and write the remaining data to file ZOw%Fw4B       Dim lineArray() As String, curLine As Long nHyqfd<V>       For Each curFile In fList :Y>FuE           Print "Merging data from file " & curFile KDxqz$14-           ReadFile( cDir & curFile, lineArray ) %W` }           For curLine = 2 To UBound(lineArray) n` M!K:Pq               Print #1, lineArray(curLine) $raq,SP           Next l$/.B=]       Next y!eT>4Oyg   A{|^_1       'Close the output file 9lqH       Close #1 W-D{cU   (P'{A>aHl0       Print "Finished merging RPC data for sample " & sampName As{"B       Print "FRED formatted data file: " & Chr(9) & outFile n37P$0   End Sub Opavno%&   TsVU ^Z%W   'Utility function to read the contents of a file into an array of strings. u'`eCrKT*   Function ReadFile(ByVal fileName As String, _ YpJJ]Rszg                     ByRef lineArray() As String) As Long p?-qlPl   6({TG&`!]       ReadFile = -1 1 K(0tG:5       Dim oFSO As Object G9_7jX*       Set oFSO = CreateObject("Scripting.FileSystemObject") D||)H       Erase lineArray ^m Ua5w   \:-"?       Dim fid As Long {;5\#VFg       If oFSO.fileexists( fileName ) Then WF] |-)vw           fid = FreeFile() t03X/%H           Open fileName For Input As fid }i._&x`):           lineArray = Split(Input(LOF(fid), fid), vbCrLf) g>E.Snj}           Close fid oZ5 ,y+L4       End If `NySTd)\       Set oFSO = Nothing #?"^:,Y       Return UBound( lineArray ) 4v.{C"M   ?`T Q'#P`   End Function LIE5of   ;W{2\ Es   Sub GetFileList( ByVal in_dir As String, _ G,e!!J                    ByRef in_flist() As String ) X6<Ds'I   >t#5eT`_ w       'Redimension the file list array Tm\a%Z`U>       Erase in_flist [[#zB-|   #$X _,+<HZ       'Tracks how many files are found (&MtK1; ;       Dim fCount As Long +I3j2u8L       fCount = 0 =&Z#QD"vl   i&^]qL|J       'Recurse directory and search for text files XM f>B|        Dim f As String 2Q%*` vCuV       f = Dir$(in_dir & "*.txt") ka/>jV"       While f <> "" xc}kDpF=g           ReDim Preserve in_flist(fCount) #f@}$@           in_flist(fCount) = f m<sCRWa-           fCount += 1 &G!~@\tMg           f = Dir$() ra;:       Wend <!=:{&d%       ReDim Preserve in_flist(fCount-1)