RPC Photonics扩散片BSDF

ATl?./Tu   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

>WIc"y.   摘要： i=cST8!8N   X!p`|i   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。 FO5a<6   Aeb(b+=   背景： sVK?sBs]   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。 USEb} M`   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 Fq@o_bI   0Gc@AG{   ;~EQS.Qp   )](ls@*   步骤 /\c'kMAW!   L%T(H<G   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。 d=PX}o^   图2. RPC Photonics工程漫射体不同类型的散射数据 "FWx;65CR   yQE'!m   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） a:fP   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 l6ym <V(1p   例如下所示： Wn'a'   Sample name:  EDF-C1-56 <Gi%+I@szl   Merging data from file EDF-C1-56 0-0.txt =FrB{Eu   Finished merging RPC data for sample EDF-C1-56 3R3H+W0{   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt d_,5;M^k   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Q$c6l[(g   a. 创建一个新的散射库 N2v/<   b. 散射模型命名 S^eem_ C   c. 改变散射模型为“Tabulated BSDF”. (Jk&U8y   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） C/!.VMl^   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 <X:JMj+   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， nt#9j',6Rn   g. 点击OK U`%t&7)   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 D\AVZ76F1   }OpUG   +?$J8Paf   脚本代码： >u?.gJm~   rm8Ys61\=   '#Language "WWB-COM" QQM:[1;RT   K*SgEkb'l   Option Explicit FH+X<   Io1j%T#ZT   Sub Main m2c'r3UEu   jYHnJ}<       'Cleanup ^#HaH       ClearOutputWindow() >fH0>W+!   % i4 5       Print "Merging RPC Photonics BSDF Data Files" %S`&R5       SetTextColor(255,0,0) {A/r)       Print "Note: Script should be located in the same folder as the BSDF TXT files." ;xZ+1zmL0       Print "Note: Do not run this script multiple times without deleting the output file between executions." |ia5Mr"t       SetTextColor(0,0,0) a!9'yc   xB *b7-a       'Current directory of this script (should be the same as the text files being merged) VJ~D.ec       Dim cDir As String C!j3@EZ$       cDir = MacroDir$ & "\" T/_u;My;   Mg;pNK\n       'Array which will be populated with the list of files to be merged rwRZGd *p       Dim fList() As String, curFile As String rH3U;K!       GetFileList( cDir, fList ) u?=mh`   VeGSr       Print "" g8<ODU0[g       Print "Files found for merging:" 1dQA o1       For Each curFile In fList /)ZjI W"|           Print Chr(9) & curFile KD kGQh#9       Next DYf QlA   X:G Rjoa       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. }r:"X<`       Dim nameArray() As String, sampName As String |+Y-i4t       nameArray = Split(fList(0)," 0-0.txt") .xT?%xSi/       sampName  = nameArray(0) I-]G{       Print "" hX.cdt_?       Print "Sample name: " & Chr(9) & sampName uY]';OtG   \p4*Q}t       'Open an output file and write the FRED header data *k{Llq       Dim outFile As String OrkcY39"~a       outFile = cDir & sampName & "_FRED.txt" h4hAzFQ.s       Open outFile For Output As #1 SZWNN#w60?       Print #1, "type bsdf_data" <Wn~s=       Print #1, "format angles=deg bsdf=value scale=1" 9xQ|Uad+%   @]Jq28       'Loop the file list, skip the two header lines and write the remaining data to file ef)RlzLOq       Dim lineArray() As String, curLine As Long LJeq{Z       For Each curFile In fList ,U{dqw8E{           Print "Merging data from file " & curFile 8W&1"h`           ReadFile( cDir & curFile, lineArray ) mdc?~??8           For curLine = 2 To UBound(lineArray) F5*-HR               Print #1, lineArray(curLine) n!4}Hwz!           Next o?a2wY^ _       Next 3r~8:F"g   8-;.Ejz!\A       'Close the output file x6/u+Urn       Close #1 $bE"3/uf   .x=abA$!9       Print "Finished merging RPC data for sample " & sampName YEv\!%B       Print "FRED formatted data file: " & Chr(9) & outFile RuHDAJ"&a   End Sub MT{1/A;`)   ]3v)3Wp   'Utility function to read the contents of a file into an array of strings. Hk}P   Function ReadFile(ByVal fileName As String, _ Ftyxz&-4$p                     ByRef lineArray() As String) As Long <aPZE6z   D1RQkAZS       ReadFile = -1 3o rSk       Dim oFSO As Object #VhdYDbW       Set oFSO = CreateObject("Scripting.FileSystemObject") 4rhHvp       Erase lineArray 4-bM90&1t   ,LBj$U]e|E       Dim fid As Long EZj rX>"#       If oFSO.fileexists( fileName ) Then 94!} Z>           fid = FreeFile() {L$$"r,           Open fileName For Input As fid # ?Ix6 {R           lineArray = Split(Input(LOF(fid), fid), vbCrLf) JrBPx/?(,;           Close fid 2m$C;j!D       End If \4 b^*`d       Set oFSO = Nothing %s}{5Qcl/       Return UBound( lineArray ) T>'w]wi   61_PSScSY   End Function IR"C?   `C4(C4u   Sub GetFileList( ByVal in_dir As String, _ J{4=:feIC?                    ByRef in_flist() As String ) +=W(c8~P   @0@WklAJA       'Redimension the file list array Eq_@xT0>       Erase in_flist Af\@J6viF7   ` 0@m,       'Tracks how many files are found Lum=5zDo       Dim fCount As Long p4uzw       fCount = 0 \>\ERV Ed   c6b51)sQ"       'Recurse directory and search for text files ~JRq :       Dim f As String CL7_3^2qI       f = Dir$(in_dir & "*.txt") /Igz[P^\9       While f <> "" 5Y;&L!T           ReDim Preserve in_flist(fCount) W /v &V#           in_flist(fCount) = f )-I/ej^           fCount += 1 }>iNT.Lvd           f = Dir$() 1#L%Q(G       Wend 1TEKq#t;y       ReDim Preserve in_flist(fCount-1)