RPC Photonics扩散片BSDF

l9 |x7GB   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

zMXlLRC0   摘要： y8{PAH8S   \:*<En0   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。 wM^_pah#Y5   {c3u!}mW   背景： Q qC 4g]   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。 LE|*Je3a   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 -%U 15W;   Vo\RtM/6{   %>cl0W3x   2nQrCdRC   步骤 n>w/T"   &tULSp@J   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。  ^vPt Ppt   图2. RPC Photonics工程漫射体不同类型的散射数据 2ja@NT   xz+Y1fYT   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） buXPeIo^VM   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 o@o6<OP^   例如下所示： e%v<nGN.-   Sample name:  EDF-C1-56 btfjmR<Tp   Merging data from file EDF-C1-56 0-0.txt DiB~Ovh|   Finished merging RPC data for sample EDF-C1-56 x=>+.' K   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt n: ~y]   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 5PJB<M_m:   a. 创建一个新的散射库 :\*<EIk(   b. 散射模型命名 hm%'k~   c. 改变散射模型为“Tabulated BSDF”. . Z!!x   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 ） r3@Q(Rb   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。 9q2 >_Mv   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， T41&;?-   g. 点击OK w>IYrSaa>   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 n.{+\M6k   UXXN\D   ?Jlz{msI   脚本代码： 0x}8}   Fr}e-a   '#Language "WWB-COM" <"uT=]wZ=   3gW4\2|T   Option Explicit ({ 7tp!@   i>9/vwe   Sub Main y@;4F n/   #rZk&q       'Cleanup B/i`       ClearOutputWindow() wl{Fx+<^3   JTw'ecFev       Print "Merging RPC Photonics BSDF Data Files" 8t$a8 PE       SetTextColor(255,0,0) E6SGK,f0D       Print "Note: Script should be located in the same folder as the BSDF TXT files." =a`l1zn8=       Print "Note: Do not run this script multiple times without deleting the output file between executions." Ge+&C RhyX       SetTextColor(0,0,0) @15%fX`*o   5#zwdoQ       'Current directory of this script (should be the same as the text files being merged) }2.^n{Y       Dim cDir As String 27-<q5q       cDir = MacroDir$ & "\"  H}NW?   Mj&f7IUO       'Array which will be populated with the list of files to be merged 71+J{XOC       Dim fList() As String, curFile As String R|T_9/#)       GetFileList( cDir, fList ) yA%(!v5UT   uc?QS~H&w       Print "" P-L<D!25       Print "Files found for merging:" 5|ih>?C/(       For Each curFile In fList b;& J2:`           Print Chr(9) & curFile =|n NC       Next |X9YVZC   Ox"4 y       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ;l_%;O5       Dim nameArray() As String, sampName As String J!,5HJh1       nameArray = Split(fList(0)," 0-0.txt") m:<cLc :.       sampName  = nameArray(0) =6t)-53       Print "" Sd.i1w&       Print "Sample name: " & Chr(9) & sampName S]Gw}d]4   /vFw5KUu       'Open an output file and write the FRED header data hu-fwBK       Dim outFile As String h3issi+N       outFile = cDir & sampName & "_FRED.txt" $4`RJ{ZJw]       Open outFile For Output As #1 VdR5ZP       Print #1, "type bsdf_data" S @\Pki+n[       Print #1, "format angles=deg bsdf=value scale=1" ZD1UMB0$4   {A4"KX(U       'Loop the file list, skip the two header lines and write the remaining data to file \GeUX<Fl       Dim lineArray() As String, curLine As Long 8# S|jBV       For Each curFile In fList tFvti5           Print "Merging data from file " & curFile TL+a_]3@           ReadFile( cDir & curFile, lineArray ) ARW|wXhyf           For curLine = 2 To UBound(lineArray) + )?1F               Print #1, lineArray(curLine) u0h {bu           Next @R>4b       Next 3Juhn5&N   $=n|MbFl       'Close the output file w,]cFT       Close #1 6 $%^   i% k`/X;       Print "Finished merging RPC data for sample " & sampName )`Tny]M       Print "FRED formatted data file: " & Chr(9) & outFile ^;GJ7y&,d   End Sub AFL*a*   o[^%0uVF   'Utility function to read the contents of a file into an array of strings. 02&mM%#   Function ReadFile(ByVal fileName As String, _ _ Onsfv                     ByRef lineArray() As String) As Long ~=P&wBnJ   ,;C92 XY       ReadFile = -1 N(Us9       Dim oFSO As Object Y_S^B)y       Set oFSO = CreateObject("Scripting.FileSystemObject")  N\DEY]       Erase lineArray M cE$=Vv   g ZhE\       Dim fid As Long nJ.pPzH2g       If oFSO.fileexists( fileName ) Then [#n~ L6           fid = FreeFile() {) 4 D 1           Open fileName For Input As fid oddS~lW           lineArray = Split(Input(LOF(fid), fid), vbCrLf) =0`"T!1           Close fid =jip* E^       End If 2|(J<H       Set oFSO = Nothing BBnbXhxZ       Return UBound( lineArray ) gKcP\m   ^x%yIS   End Function #ldNWwvRGj   w``t"v4   Sub GetFileList( ByVal in_dir As String, _ vn~DtTp/                    ByRef in_flist() As String ) O9oVx4=   e{.2*>pH       'Redimension the file list array X1!m]s(I       Erase in_flist N%/Qc hu   Fkj\U^G       'Tracks how many files are found !NK8_p|X       Dim fCount As Long ;%odN d       fCount = 0 8$-Wz:X&   R>BI;IcX       'Recurse directory and search for text files EbuOPa       Dim f As String +w:[By"       f = Dir$(in_dir & "*.txt") f8_5.vlw       While f <> "" w<&Nn`V           ReDim Preserve in_flist(fCount) gvYa&N           in_flist(fCount) = f <^|8 \<J           fCount += 1 C78YHjy           f = Dir$() aePhtQF       Wend uu1-` !%       ReDim Preserve in_flist(fCount-1)