RPC Photonics扩散片BSDF

d a.6Z!a   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

|0N1]Hf   摘要： 3)~z~p7   NK(; -~{P   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。 u*!/J R   1d~cR   背景： m-|~tve   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@N*W]   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 l:"zYcp%   BxXP]od   8IihG \   0o&c8?@j   步骤 2Rs-!G<]   kF"G {5   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。 P*8DM3':   图2. RPC Photonics工程漫射体不同类型的散射数据 Z=/bD*\g   $x1PU67   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） <nT).S>+   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 -]vPF|   例如下所示： ! ^U!T\qDi   Sample name:  EDF-C1-56 vWpkU<&3|   Merging data from file EDF-C1-56 0-0.txt [=KA 5c<   Finished merging RPC data for sample EDF-C1-56 MF~Tr0tOC   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt JlN<w   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 b+ v!3|   a. 创建一个新的散射库 `Ot;KDz   b. 散射模型命名 T,Zfz9{n   c. 改变散射模型为“Tabulated BSDF”. :k.C|V!W   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 ） }Dc?Emb   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。 `!iVMTp   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， g6T /k7a   g. 点击OK n42XqR   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 SXfAw)-n   92K#xM/   qx3`5)ef   脚本代码： ZA/:\6gm   N|L Ey   '#Language "WWB-COM" OQm-BL   h\qM5Qx+Q   Option Explicit  MfNguh   !9JK95;   Sub Main -&\?Q_6   dKwY\)\       'Cleanup Epf[8La       ClearOutputWindow() 3[O;HS3|   Y^W.gGM       Print "Merging RPC Photonics BSDF Data Files" ~%o?J"y       SetTextColor(255,0,0) {Deg1V!x>       Print "Note: Script should be located in the same folder as the BSDF TXT files." C 9:5c@G       Print "Note: Do not run this script multiple times without deleting the output file between executions." hJ1:#%Qe.       SetTextColor(0,0,0) LxC"j1wfl   92HxZ*t7km       'Current directory of this script (should be the same as the text files being merged) _~b$6Nf!83       Dim cDir As String ;/phZ$l       cDir = MacroDir$ & "\" `CXAE0Fx   tag~SG`ov       'Array which will be populated with the list of files to be merged w\z6-qa       Dim fList() As String, curFile As String ]B"YW_.x2       GetFileList( cDir, fList ) %SJ9Jr,   GGR hM1II       Print "" _U`_;=(       Print "Files found for merging:" oAgO3x        For Each curFile In fList On{p(|l           Print Chr(9) & curFile J~[A8o       Next `II/nv0jn   U0kEhMIIf       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. H/Fq'FsQB       Dim nameArray() As String, sampName As String \D37l_       nameArray = Split(fList(0)," 0-0.txt") m pWmExQ       sampName  = nameArray(0) pk R+H|       Print "" C 4jqT       Print "Sample name: " & Chr(9) & sampName YQI&8~z   f;;(Q-.       'Open an output file and write the FRED header data k*8 ld-O       Dim outFile As String KF[P /cFI       outFile = cDir & sampName & "_FRED.txt" )./%/ _*K       Open outFile For Output As #1 noBGP/Av=:       Print #1, "type bsdf_data" T53|*~u       Print #1, "format angles=deg bsdf=value scale=1" 7]~65@%R-&   qdFYf/y       'Loop the file list, skip the two header lines and write the remaining data to file [o=v"s't)       Dim lineArray() As String, curLine As Long A:3:Cr       For Each curFile In fList 8W|qm;J98           Print "Merging data from file " & curFile "c6(=FFq           ReadFile( cDir & curFile, lineArray ) x]gf3Tc58           For curLine = 2 To UBound(lineArray) 9cu0$P`}5               Print #1, lineArray(curLine) }!-K)j.           Next %y/8i%@6       Next wY`yP!xO   #UcqKq       'Close the output file xJ|3}o:,       Close #1 W7a  aL   #O<2wMb2<       Print "Finished merging RPC data for sample " & sampName ]KS|r+       Print "FRED formatted data file: " & Chr(9) & outFile >!vb;a!   End Sub {/x["2a1   G6N$^HkW?   'Utility function to read the contents of a file into an array of strings. Vn`-w   Function ReadFile(ByVal fileName As String, _ [4qx+ypT                     ByRef lineArray() As String) As Long V(%L}0[]   <MlRy%3Z       ReadFile = -1 2sJj - 3J       Dim oFSO As Object AiT&:'<UT       Set oFSO = CreateObject("Scripting.FileSystemObject") |uT&`0T'e`       Erase lineArray do2~L meW   S0_#h)       Dim fid As Long d85\GEF9i       If oFSO.fileexists( fileName ) Then TS9=A1J#           fid = FreeFile() |Go?A/'           Open fileName For Input As fid %d5;JEgA:g           lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0k?ph$           Close fid 9Se7 1       End If @?A39G{       Set oFSO = Nothing p:9)}y       Return UBound( lineArray ) (LW4z8e#   *uAsKU   End Function BTXS+mvl   m]y t6b4   Sub GetFileList( ByVal in_dir As String, _ JCu3,O!q                    ByRef in_flist() As String ) edh?I1/   x<'(b7{U0       'Redimension the file list array :wJ=t/ho       Erase in_flist { jnQoxN   8KioL{h       'Tracks how many files are found %rpJZ t       Dim fCount As Long $'I+] ;       fCount = 0 D:9/;9V   %ec9`0^4S       'Recurse directory and search for text files |fMjg'%{}       Dim f As String ~RV>V*l       f = Dir$(in_dir & "*.txt") =v4;t'_^       While f <> "" EK^B=)q6:W           ReDim Preserve in_flist(fCount) lF]cUp#<           in_flist(fCount) = f <MhjvHg           fCount += 1 /P~@__XN           f = Dir$() #"^F:: b-       Wend <_HK@E<_HO       ReDim Preserve in_flist(fCount-1)