RPC Photonics扩散片BSDF

*n@rPr-   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

'X&"(M   摘要： A~?)g!tS<   5>1c4u`x   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。  d *([!!i   !VG ]~lc   背景： "GqasbX   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。 eK3d_bF+   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 = -P<v2|e   8r,0Qic2K   |z}VP-L   98zJ?NaD&   步骤 8193d%Wb   K;\fJ2ag   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\)q   图2. RPC Photonics工程漫射体不同类型的散射数据 MM@&QaK   m9D*I1   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） 7Fa1utV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 "x_G6JE4tv   例如下所示： hG9Mp!d91   Sample name:  EDF-C1-56 ^q}phj3E   Merging data from file EDF-C1-56 0-0.txt =7~;*Ts   Finished merging RPC data for sample EDF-C1-56 11A;z[Zk   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt G -o6~"J\   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 li')U   a. 创建一个新的散射库 Y{4nBu   b. 散射模型命名 r0'a-Mk;   c. 改变散射模型为“Tabulated BSDF”. %|2x7@&s   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 ） /(s N@kt   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。 vsq |m5   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， _t X1z^   g. 点击OK NPE 4@c_a@   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 _w5c-\-PUM   eM7F8j   &y3;`A7,   脚本代码： bSTTr<W   shY8h    '#Language "WWB-COM" m{yq.H[X   ,;h}<("q   Option Explicit H,!yG5yF   U'}[:h~)   Sub Main |gGD3H   W>u$x=<T       'Cleanup B|AIl+y       ClearOutputWindow() }qhND-9#@   ]e?L,1-       Print "Merging RPC Photonics BSDF Data Files" (gutDUO;       SetTextColor(255,0,0) 4%jQHOZ       Print "Note: Script should be located in the same folder as the BSDF TXT files." a{}8030S       Print "Note: Do not run this script multiple times without deleting the output file between executions." QA~Lm       SetTextColor(0,0,0) C8 $KVZ   ch/DBu       'Current directory of this script (should be the same as the text files being merged) %LnG^L       Dim cDir As String kh"APxQ79       cDir = MacroDir$ & "\" Sjmq\A88dc   xUB{{8B:L       'Array which will be populated with the list of files to be merged k,/2]{#53d       Dim fList() As String, curFile As String G|UeR=/       GetFileList( cDir, fList ) !@)tkhP   xwijCFI*       Print "" V67<Ky>       Print "Files found for merging:" cMAY8$       For Each curFile In fList // }KWz           Print Chr(9) & curFile "!o|^nN,       Next 6.3qux9   S<++eu       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 1(a+|       Dim nameArray() As String, sampName As String kl5Y{![/&f       nameArray = Split(fList(0)," 0-0.txt") /8>we`4       sampName  = nameArray(0) TzV~I\a|       Print "" 4+N9Ylh       Print "Sample name: " & Chr(9) & sampName T FK#ign   #\O?|bN'q       'Open an output file and write the FRED header data ;E\e.R       Dim outFile As String chU,));F       outFile = cDir & sampName & "_FRED.txt" K=J">^uW       Open outFile For Output As #1 >6z7.d       Print #1, "type bsdf_data" J['?ud}@       Print #1, "format angles=deg bsdf=value scale=1" hh^_Z| 5   aw1f;&K4       'Loop the file list, skip the two header lines and write the remaining data to file ^ Mq8jw(2       Dim lineArray() As String, curLine As Long xcXnd"YYE       For Each curFile In fList k=.pcDX           Print "Merging data from file " & curFile N6/;p]|           ReadFile( cDir & curFile, lineArray ) Y:5Gp8Vi           For curLine = 2 To UBound(lineArray) ju/#V}N               Print #1, lineArray(curLine) )s8{|)-           Next {mB &xz:b       Next DcNwtts   .:TSdusr~       'Close the output file \.MPjD       Close #1 P{>-MT2E   x1 1ug       Print "Finished merging RPC data for sample " & sampName WeS$$:ro       Print "FRED formatted data file: " & Chr(9) & outFile 4]ETF+    End Sub zWq&HBs   *>7Zc   'Utility function to read the contents of a file into an array of strings. RjG=RfB'V   Function ReadFile(ByVal fileName As String, _ M{`uI8vD                     ByRef lineArray() As String) As Long bqm%@*fZo   Vg1MA       ReadFile = -1 h8?E+0       Dim oFSO As Object Ku]<$uo       Set oFSO = CreateObject("Scripting.FileSystemObject") SQI =D8       Erase lineArray d 2<+Pp   a^Lo;kHY       Dim fid As Long t;)`+K#1:       If oFSO.fileexists( fileName ) Then 4mwAo           fid = FreeFile() sFonc           Open fileName For Input As fid Zl=IZ?F            lineArray = Split(Input(LOF(fid), fid), vbCrLf) [!>DQE           Close fid Q`(h       End If Gbc2\A\       Set oFSO = Nothing "P8cgj C       Return UBound( lineArray ) JReJlDu   C4t@;U=x   End Function ](sT,'   _[ufH*   Sub GetFileList( ByVal in_dir As String, _ ynG@/S6)K                    ByRef in_flist() As String ) OA8iTn   ($^=f}+       'Redimension the file list array pwr]lV$w       Erase in_flist rsC^Re:*jr   _D~FwF&A       'Tracks how many files are found Uk=L?t       Dim fCount As Long v L!?4k       fCount = 0 cR/z;*wr7   Tyt1a>!qA       'Recurse directory and search for text files ev%}\^Vl[       Dim f As String y,vrMWDy       f = Dir$(in_dir & "*.txt") . I#d R*       While f <> "" 'mU7N<Q$qQ           ReDim Preserve in_flist(fCount) |s*tRag           in_flist(fCount) = f {N 0i 3e s           fCount += 1 (eF "[,z           f = Dir$() xC.Tipn>       Wend f|-%.,       ReDim Preserve in_flist(fCount-1)