RPC Photonics扩散片BSDF

~%lUzabMa   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

|t"CH'KJZ   摘要： |WUM=g7PC   lpPPI+|4N   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。 /7#MJH5b6   _KloX{a   背景： Qu<6X@+5   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。 ElTB{C>u   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 >/RFff]Fh0   )cL(()N   ;HYEJ3    &I-T   步骤 (z;lNl(*C   yk!K5   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。 Yt=)=n   图2. RPC Photonics工程漫射体不同类型的散射数据 }>y!I5O   >aVtYp B   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） !m))Yp-"H   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 ?=)lbSu K   例如下所示： dHAT($QG   Sample name:  EDF-C1-56 D HQxu4   Merging data from file EDF-C1-56 0-0.txt BT}l"   Finished merging RPC data for sample EDF-C1-56 #oiU|>3Y   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt [&P@0Fn   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 3S#p4{3   a. 创建一个新的散射库 h$sOJs~6h   b. 散射模型命名 '+l"zK]L-   c. 改变散射模型为“Tabulated BSDF”. J:'_S `J   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 ）  {d#sZT   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。 #:[F=2@,A   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， #mJRL[V5^   g. 点击OK 96;5   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 %R?WkG   lq.]@zlSO   *otgI"y\   脚本代码： ]Hl{(v\HO   }oiNgs/N   '#Language "WWB-COM" ' A+L #   y:Gn58\o   Option Explicit }^Sk.:;n3   ]8"U)fzmc.   Sub Main aso8,mpZuA   7jxx,#I:       'Cleanup o+8H:7,o'       ClearOutputWindow() )w<Z4_!N4s   2[=3-1c       Print "Merging RPC Photonics BSDF Data Files" 4 7mT       SetTextColor(255,0,0) %t6-wWM97       Print "Note: Script should be located in the same folder as the BSDF TXT files." kf<c[su       Print "Note: Do not run this script multiple times without deleting the output file between executions." RcJtVOrd       SetTextColor(0,0,0) mA.,.<xE@   DC/Cz kv9       'Current directory of this script (should be the same as the text files being merged) /zXOtaG       Dim cDir As String 7f k)a       cDir = MacroDir$ & "\" PRUl-v   !U}2YM J       'Array which will be populated with the list of files to be merged F =*4]O       Dim fList() As String, curFile As String 5|r*,!CF       GetFileList( cDir, fList ) .9Cy<z   F_-xp1|       Print "" m3o -p       Print "Files found for merging:" zx$1.IM"4       For Each curFile In fList j[R.UB3J           Print Chr(9) & curFile CLmo%"\s       Next rp"5176   :JX2GRL4       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. uD?G\"L i       Dim nameArray() As String, sampName As String HnjA78%i       nameArray = Split(fList(0)," 0-0.txt") "P|n'Mx       sampName  = nameArray(0) e-v|       Print "" 5y g` TW       Print "Sample name: " & Chr(9) & sampName RR:%"4M   }6.@       'Open an output file and write the FRED header data m44a HBwId       Dim outFile As String AWMJ/E*T       outFile = cDir & sampName & "_FRED.txt" R@pY+d9qp       Open outFile For Output As #1 }@t"B9D       Print #1, "type bsdf_data" o9sPyY$aQ       Print #1, "format angles=deg bsdf=value scale=1" %GY'pQz   a:l-cZ/!       'Loop the file list, skip the two header lines and write the remaining data to file G{4s~Pco[Q       Dim lineArray() As String, curLine As Long 45wtl/^9       For Each curFile In fList "@hd\w{.           Print "Merging data from file " & curFile ffR%@           ReadFile( cDir & curFile, lineArray ) JN9>nC!Zy_           For curLine = 2 To UBound(lineArray) .QKyB>s               Print #1, lineArray(curLine) }Md;=_TP           Next ^<-r57pz       Next y9d"sqyh   *-Yw%uR       'Close the output file 6YNL4HE?       Close #1 =z" +)N   d,l?{Ln       Print "Finished merging RPC data for sample " & sampName w$9LcN       Print "FRED formatted data file: " & Chr(9) & outFile 3 1-p/   End Sub I-g/)2   0mUVa=)D   'Utility function to read the contents of a file into an array of strings. M+VWAh#uD   Function ReadFile(ByVal fileName As String, _ 7p2xst                     ByRef lineArray() As String) As Long UQ0<sI=   *n EkbI/       ReadFile = -1 ;9h;oB@       Dim oFSO As Object 9-{=m+|b       Set oFSO = CreateObject("Scripting.FileSystemObject") <nqv)g"u0       Erase lineArray KfBT'6t   s^eiymP       Dim fid As Long /QyKXg6)l       If oFSO.fileexists( fileName ) Then egG<"e*W}N           fid = FreeFile() EI 35&7(           Open fileName For Input As fid 4RtAwB           lineArray = Split(Input(LOF(fid), fid), vbCrLf) lD3nz<p           Close fid jci,]*X4       End If 9>9EZ?4m       Set oFSO = Nothing CKK}Z;~:       Return UBound( lineArray ) ]nB|8k=J   jmkOu 5@   End Function '-RacNY   =gQ9>An   Sub GetFileList( ByVal in_dir As String, _ -GCo`PR?b                    ByRef in_flist() As String ) @lE'D":?   ?BfE*I$\h       'Redimension the file list array c'eZ-\d{       Erase in_flist ZzupK^5Z   2,q*[Kh1       'Tracks how many files are found edq,:       Dim fCount As Long 18Y#=uH}       fCount = 0 K$M+"#./   _i+@HXR &       'Recurse directory and search for text files <8^x Mjc       Dim f As String LQ# E+id&       f = Dir$(in_dir & "*.txt")  ,u2Qkw       While f <> "" tWIJ,_8l           ReDim Preserve in_flist(fCount) -<6?ISF2           in_flist(fCount) = f MqAi}z%           fCount += 1 R03 Te gwA           f = Dir$() :HO5 T       Wend &2`p#riAS       ReDim Preserve in_flist(fCount-1)