RPC Photonics扩散片BSDF

vxZvK0b620   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

zYYc#N/   摘要： n_)d4d zl   j?g{*M   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。 _yJd@   Q6RBZucv   背景： opjrU$<]N   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。 fwf]1@#   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 cDxjD5E   :I+%v   jv5p_v4%O   -1:yqF.x   步骤 $a(wM1S4   ^B1Q";# B^   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。 Q^DKKp   图2. RPC Photonics工程漫射体不同类型的散射数据 K {!eHTU   i=o<\{iV:   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） o\g",O4-   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 $0AN5 |`g\   例如下所示： 9%$4Ux*q   Sample name:  EDF-C1-56 y%cg   Merging data from file EDF-C1-56 0-0.txt 9H" u\t|?   Finished merging RPC data for sample EDF-C1-56 d s4ERe /   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 71@V|$Dy   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Yr,e7da   a. 创建一个新的散射库 DKF`uRvGN:   b. 散射模型命名 qI) Yzc/   c. 改变散射模型为“Tabulated BSDF”. UKZsq5Q   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 ） wX<)Fj'   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。 -SlLX\>p   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， 8qrE<RHU@   g. 点击OK W.HM!HQp   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 2 Af1-z^^K   ](aXZ<,   |jU/R   脚本代码： Wepa;   ?Sh]m/WZd[   '#Language "WWB-COM" u0A.I_   a^@6hC>sr   Option Explicit p4fU/   2VrF~+   Sub Main 8)\ ?6C   /Pxt f~$       'Cleanup KWLI7fTgj$       ClearOutputWindow() lN<v u#   X) owj7U;       Print "Merging RPC Photonics BSDF Data Files" NJI-8qTGI       SetTextColor(255,0,0) ^}a..@|%W       Print "Note: Script should be located in the same folder as the BSDF TXT files." BB.^-0up       Print "Note: Do not run this script multiple times without deleting the output file between executions." fx_7X15       SetTextColor(0,0,0) kbN2dL   Ww{bh-nyq       'Current directory of this script (should be the same as the text files being merged) 2!QJa=       Dim cDir As String 7ykpDl^@       cDir = MacroDir$ & "\" ,j:`yB]4,   ^|5vmI'E       'Array which will be populated with the list of files to be merged [O2xE037h`       Dim fList() As String, curFile As String ey_3ah3x       GetFileList( cDir, fList ) rFh!&_   &u&/t?       Print "" eBFsKOtu       Print "Files found for merging:" +4Aj/$%[q       For Each curFile In fList dzjp,c@           Print Chr(9) & curFile FMc$?mm       Next ': 87.8$   1aP3oXLL       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. D{x'k2=       Dim nameArray() As String, sampName As String )>QpR8 G-       nameArray = Split(fList(0)," 0-0.txt") Q( U+o-       sampName  = nameArray(0) )[C]1N=tK       Print "" 1Mn=m w       Print "Sample name: " & Chr(9) & sampName jdiH9]&U   b}HLuX       'Open an output file and write the FRED header data 3 +%a       Dim outFile As String zR_ "       outFile = cDir & sampName & "_FRED.txt" F{WV}o=MY       Open outFile For Output As #1 dY5 m) ?       Print #1, "type bsdf_data" M+j V`J!       Print #1, "format angles=deg bsdf=value scale=1" w &1_k:Z&   sG7G$G*ta!       'Loop the file list, skip the two header lines and write the remaining data to file -GJ~xcf0       Dim lineArray() As String, curLine As Long K|%.mcs4       For Each curFile In fList s1.EE|h,5           Print "Merging data from file " & curFile  ?12[8           ReadFile( cDir & curFile, lineArray ) K~$A2b95           For curLine = 2 To UBound(lineArray) w<#/ngI2               Print #1, lineArray(curLine) :[xFp}w{           Next $REz{xgA=       Next $9 YA q/#Q   [1nfSW       'Close the output file  `fMdO       Close #1 \NU^Jc_k7   (yA`h@@WS       Print "Finished merging RPC data for sample " & sampName `yJ3"{uO       Print "FRED formatted data file: " & Chr(9) & outFile 2n+tc   End Sub Of0(.-Q w   VUnO&zV{   'Utility function to read the contents of a file into an array of strings. ]dIcW9a   Function ReadFile(ByVal fileName As String, _ r&+8\/{                     ByRef lineArray() As String) As Long (SGX|,5X7   i]x_W@h       ReadFile = -1 3N c#6VI       Dim oFSO As Object RT`.S uN       Set oFSO = CreateObject("Scripting.FileSystemObject") o]/*YaB2>       Erase lineArray tf[)Q:|   CGw,RNV       Dim fid As Long 3MX&%_wUhB       If oFSO.fileexists( fileName ) Then g?B4b7II           fid = FreeFile() StLFq6BO           Open fileName For Input As fid PtsQV !           lineArray = Split(Input(LOF(fid), fid), vbCrLf) K Q^CiX           Close fid =d`w~iC       End If \.ukZqB3 0       Set oFSO = Nothing .ni<'       Return UBound( lineArray ) M`V<`   gZq_BY_U   End Function t E'^O< K   BK 3oNDy   Sub GetFileList( ByVal in_dir As String, _ jRiXN%                    ByRef in_flist() As String ) :.9Y   e |K_y~       'Redimension the file list array +e^CL#Gs       Erase in_flist Mz.C`Z>o   <6Y|vEo!N       'Tracks how many files are found A9lw^.       Dim fCount As Long ;A4qE W       fCount = 0 mqHcD8X   ?q7MbQw       'Recurse directory and search for text files xax[#Vl4       Dim f As String SwsJ<Dq^z       f = Dir$(in_dir & "*.txt") ~s-bA#0S       While f <> "" ht*N[Pi4;           ReDim Preserve in_flist(fCount) ftvu69f           in_flist(fCount) = f eL>wKu:r           fCount += 1 e^em^1H( %           f = Dir$() X-tw)       Wend vf zC2       ReDim Preserve in_flist(fCount-1)