RPC Photonics扩散片BSDF

WwYy[3U   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

mQy!*0y   摘要： )TV{n#n   EG3?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。 8^ezqd`   <zhN7="   背景： #JIh-h@   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。 n*vzp?+Y   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 0N(o)WRv   {t1;icu   gdkQ h_\   `UDB9Ca   步骤 |ZuS"'3_w   *='J>z.]   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。 _"R /k`8   图2. RPC Photonics工程漫射体不同类型的散射数据 O0Sk?uJ<   hd)HJb-aR   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） u?+i5=N9{   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 -kI;yL   例如下所示： "g>, X[g   Sample name:  EDF-C1-56 7lYiufg   Merging data from file EDF-C1-56 0-0.txt )S2GPn7   Finished merging RPC data for sample EDF-C1-56 B+8B<xZ   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt oz[: T3oE>   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 9j ~|m   a. 创建一个新的散射库 ~v+A6N:qC   b. 散射模型命名 !H[K"7w   c. 改变散射模型为“Tabulated BSDF”. d2XSw>   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 ） EvQMt0[?EW   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。 >p;cbp[ht   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，  8%W(",nd   g. 点击OK cgevP`*]   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 u>W:SM   sj& j\<(   "Gh5 ^$w?j   脚本代码： F vt5vQ   wz{]CQ7"   '#Language "WWB-COM" krI@N}OU   E|K~WO]>o   Option Explicit JNZ O7s   W+&<C#1|]   Sub Main 'ZboLoS*-   PA_54a9/<       'Cleanup ?ot7_vl       ClearOutputWindow() ,q|;`?R;   g=5vnY       Print "Merging RPC Photonics BSDF Data Files" :497]c3#5C       SetTextColor(255,0,0) N=[# "4I       Print "Note: Script should be located in the same folder as the BSDF TXT files." {i09e1       Print "Note: Do not run this script multiple times without deleting the output file between executions." Q"+)xj       SetTextColor(0,0,0) yRF %SWO   y6C3u5`       'Current directory of this script (should be the same as the text files being merged) K.T.?ug;:       Dim cDir As String zm7IkYF       cDir = MacroDir$ & "\" fCa*#ME   ta'{S=^j       'Array which will be populated with the list of files to be merged 2LqJ.HH       Dim fList() As String, curFile As String lUJ~_`D       GetFileList( cDir, fList ) ;Or]x?-   [zv@}@$       Print "" )EhRqX9       Print "Files found for merging:" Je1'0h9d       For Each curFile In fList 9nrmz>es|-           Print Chr(9) & curFile %{*A@jQsg       Next <bbC&O\   e[ 9       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 9\J.AAk~/       Dim nameArray() As String, sampName As String ,K>q{H^       nameArray = Split(fList(0)," 0-0.txt") oZCjci-       sampName  = nameArray(0) M8p6f)l3       Print "" 6myF!  H=       Print "Sample name: " & Chr(9) & sampName 9H6 %\#rw   ys~oJb~       'Open an output file and write the FRED header data 94CHxv       Dim outFile As String s=BJ7iU_68       outFile = cDir & sampName & "_FRED.txt" iu9<]1k       Open outFile For Output As #1 |_GESpoHH       Print #1, "type bsdf_data" LZ 3PQL       Print #1, "format angles=deg bsdf=value scale=1" { )L*\r   } F<=       'Loop the file list, skip the two header lines and write the remaining data to file $(=0J*ND"       Dim lineArray() As String, curLine As Long XQhbH^       For Each curFile In fList _ \LPP_           Print "Merging data from file " & curFile Q]7}"B&           ReadFile( cDir & curFile, lineArray ) M?QK4Zxb6U           For curLine = 2 To UBound(lineArray) OKO+(>AQ               Print #1, lineArray(curLine) ZKp9k6           Next f(Uo?_as       Next aSVR+of   Mr6q7       'Close the output file QGoBugU       Close #1 &R L j^A!   "eb+ O       Print "Finished merging RPC data for sample " & sampName  Bl1^\[#       Print "FRED formatted data file: " & Chr(9) & outFile qvN`46c   End Sub _ >=QZ`!r   jM'(Qa    'Utility function to read the contents of a file into an array of strings. )r|Pm-:A{   Function ReadFile(ByVal fileName As String, _ IQNvhl.{                     ByRef lineArray() As String) As Long @5:#J!   L2}p<?f       ReadFile = -1 dZIruZ)x       Dim oFSO As Object Q@aDa8Z       Set oFSO = CreateObject("Scripting.FileSystemObject") .jK,6't^       Erase lineArray 3@8Zy:[8<   S #6:!       Dim fid As Long L[aA4`       If oFSO.fileexists( fileName ) Then U0fr\kM           fid = FreeFile() 9>7w1G#           Open fileName For Input As fid OZn40"`           lineArray = Split(Input(LOF(fid), fid), vbCrLf) |:b!e           Close fid 7:$zSj#y       End If W%_Cda5,       Set oFSO = Nothing Q35jJQ$<`       Return UBound( lineArray ) G+V?c1Me   ]7:*A7/!.   End Function cOrFe;8-.   DNmP>~   Sub GetFileList( ByVal in_dir As String, _ !'f.g|a                    ByRef in_flist() As String ) =Eb4Iyz   =Yt)b/0b9       'Redimension the file list array sHn-#SGm       Erase in_flist t^5xq8w8   gt|:K)[,6       'Tracks how many files are found MG(qQ#;j/       Dim fCount As Long Q=n2frW(T       fCount = 0 /P koqA,   Q8?:L< A       'Recurse directory and search for text files Uxb>)36I       Dim f As String ['JIMcD       f = Dir$(in_dir & "*.txt") |Q*OA       While f <> "" 4KnrQ-D           ReDim Preserve in_flist(fCount) ka?EXF:           in_flist(fCount) = f :/~TV            fCount += 1 >^TcO           f = Dir$() V PaW-o       Wend uB>OS1=       ReDim Preserve in_flist(fCount-1)