RPC Photonics扩散片BSDF

LM*#DLadk   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

.{-&3++WZ   摘要： = ]pcC   xp395ub6   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。 2qb,bp1$   y] Io`w(>   背景： ::\7s   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。 Bu ~N)^   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 _?M71>3$.   1k5o?'3&   nyZUf{:   :EISms   步骤 Zhl}X!:c?\   ,qj   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。 o%+8.Tx6wT   图2. RPC Photonics工程漫射体不同类型的散射数据 edt(Zzk@3-   .c[v /SB]   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） \BT8-}   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 R"S,&   例如下所示： $J>J@4   Sample name:  EDF-C1-56 s2*^ PG   Merging data from file EDF-C1-56 0-0.txt NR8YVO)5$   Finished merging RPC data for sample EDF-C1-56 dF$Fd{\4^   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt :V>M{vd   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 wG1A]OJl1   a. 创建一个新的散射库 o(,u"c/Or   b. 散射模型命名 /dU-$}>ZI   c. 改变散射模型为“Tabulated BSDF”. sv<U$M~)X   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） x[Xj[O   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 T@PtO"r   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， RCED K\*m   g. 点击OK a'f0Wv0%"   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 Ou~|Q&f'   7-nz'-'   Zh?1+Sz&   脚本代码： FFH9$>A   .JNU3%s   '#Language "WWB-COM" ,t4g^67R{   c;w%R8z   Option Explicit s6k,'`.   eMPkk=V   Sub Main CwKo'PAJ   YYrXLt:       'Cleanup 8y!d^EQ       ClearOutputWindow() *I0{1cST   XG fLi       Print "Merging RPC Photonics BSDF Data Files" s2t'jIB       SetTextColor(255,0,0) {'W\~GnZ       Print "Note: Script should be located in the same folder as the BSDF TXT files." Jsi [,|G       Print "Note: Do not run this script multiple times without deleting the output file between executions." H\tz"<*``       SetTextColor(0,0,0) }(AgXvRq   T<*i($ [       'Current directory of this script (should be the same as the text files being merged) ;eznONNF       Dim cDir As String [TiOh'       cDir = MacroDir$ & "\" k^3|A3A   rA9BY :N@       'Array which will be populated with the list of files to be merged YYDLFtr2       Dim fList() As String, curFile As String 30 VvZb       GetFileList( cDir, fList ) =F2e*?a3   g:/l5~b       Print "" =/@c9QaVB       Print "Files found for merging:" 4&IBNc,sn       For Each curFile In fList ' bio:1           Print Chr(9) & curFile OczVObbS       Next ^E&':6(   ShAI6j       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. eR.ucTji       Dim nameArray() As String, sampName As String MIPmsEdBi       nameArray = Split(fList(0)," 0-0.txt") Yr@)W~       sampName  = nameArray(0) s8T}ah!       Print "" CybHr#LBc       Print "Sample name: " & Chr(9) & sampName /[YH W]   AY['!&T       'Open an output file and write the FRED header data 9.R)iA       Dim outFile As String 7_ g}t!b`       outFile = cDir & sampName & "_FRED.txt" \HFeEEKH       Open outFile For Output As #1 Q7O8']~n       Print #1, "type bsdf_data" _K{hq<g       Print #1, "format angles=deg bsdf=value scale=1" *V(TNLIh;   '`^<*;w       'Loop the file list, skip the two header lines and write the remaining data to file iivuH2/~?[       Dim lineArray() As String, curLine As Long T_CYSS|fX       For Each curFile In fList $F EG0&           Print "Merging data from file " & curFile :(EU\yCzK           ReadFile( cDir & curFile, lineArray ) kQX tO)           For curLine = 2 To UBound(lineArray) rt] @Z`w               Print #1, lineArray(curLine) 7-81,ADv(           Next o >bf7+D       Next k WYjqv   n0#HPI"       'Close the output file Wbc*x       Close #1 _@0>yMZ^   WZaOw w       Print "Finished merging RPC data for sample " & sampName %7q,[g8       Print "FRED formatted data file: " & Chr(9) & outFile )`]w\s #   End Sub {q%&~   H)1< ;{:   'Utility function to read the contents of a file into an array of strings. g9OO#C>   Function ReadFile(ByVal fileName As String, _ ;3NA,JA#Y                     ByRef lineArray() As String) As Long #LEK? ]y   `-S6g^Y       ReadFile = -1 A<.`HCv2       Dim oFSO As Object )6dvWK       Set oFSO = CreateObject("Scripting.FileSystemObject") weC$\st:D       Erase lineArray :M(%sv</   31-%IkX+k       Dim fid As Long T%K"^4k       If oFSO.fileexists( fileName ) Then DPIiGRw           fid = FreeFile() O$+J{@           Open fileName For Input As fid a2fV0d6*l           lineArray = Split(Input(LOF(fid), fid), vbCrLf) L}CjC>R!           Close fid GYYk3\r       End If 'Uqz,       Set oFSO = Nothing "Q]`~u':       Return UBound( lineArray ) */ZrZ^?o   n?vrsqmZ   End Function RajzH2j+>   DOiL3i"H   Sub GetFileList( ByVal in_dir As String, _ eZs34${fN                    ByRef in_flist() As String ) gS~QlW V   !q!.OQ       'Redimension the file list array 09pnM|8A       Erase in_flist SN O'*?   !Q =H)\3       'Tracks how many files are found GMRw+z4       Dim fCount As Long dN J2pfvv       fCount = 0 ~=i9]%g?   lw0l86^Y       'Recurse directory and search for text files *?%DdVrO@       Dim f As String LDHu f<`       f = Dir$(in_dir & "*.txt") 7:t+       While f <> "" jD9^DzFx           ReDim Preserve in_flist(fCount) PvX>+y5           in_flist(fCount) = f b_@MoL@A!           fCount += 1 Lh0Pvq0C           f = Dir$() 85YE6^y       Wend Mp9wYM*       ReDim Preserve in_flist(fCount-1)