RPC Photonics扩散片BSDF

P^<0d'(   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

D62 NU   摘要： q(tGbhQ   bb/?02*)H   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。 $#ju?B~   J1Ki2I=   背景： V;hwAQbF   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。 }Wche/g`   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 >"<k8wn   !+DJhw&c,   M$4=q((0   FJ(B]n[>   步骤 [aM'   -S%q!%}u   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。 "3i80R\w`F   图2. RPC Photonics工程漫射体不同类型的散射数据 : {WrS   LQ(5D_yG.   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） @-&(TRbZo   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 "(\) &G   例如下所示： Sa1z,EP   Sample name:  EDF-C1-56 9+8!xwR:   Merging data from file EDF-C1-56 0-0.txt 9kX=99kf[   Finished merging RPC data for sample EDF-C1-56 D@\;@( |   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt sId(PT^   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Ph+X{|   a. 创建一个新的散射库 #;"D)C   b. 散射模型命名 0+<eRR9-   c. 改变散射模型为“Tabulated BSDF”. b~r{J5x@   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 ） p;u 1{   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。 o!toO&=   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， h#m:Y~GoF   g. 点击OK GKyG #Fl   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 $~,}yh;   f7Df %&d   Q1 nDl   脚本代码： %`?;V;{=   QSF"8Uk   '#Language "WWB-COM" I!@s6tG   G=Hf&l   Option Explicit M6jp1:ZH2q   @ <OO   Sub Main 0939i_   )jlP cO-       'Cleanup 4g7ja       ClearOutputWindow() .;HIEj zq   %h"qMs S       Print "Merging RPC Photonics BSDF Data Files" R>d@tr       SetTextColor(255,0,0) 1X::0;3       Print "Note: Script should be located in the same folder as the BSDF TXT files." &whX*IZ{       Print "Note: Do not run this script multiple times without deleting the output file between executions." HUJ|-)"dw       SetTextColor(0,0,0) e`Co,>W/   iIsEQh       'Current directory of this script (should be the same as the text files being merged) \+iu@C        Dim cDir As String ms}f>f=       cDir = MacroDir$ & "\" @q&|MMLt   .~q)eV       'Array which will be populated with the list of files to be merged ?Ml%$z@b?       Dim fList() As String, curFile As String Il{^ j6       GetFileList( cDir, fList ) L\}Pzxn   w{3Q( =&       Print "" ,{?q^"       Print "Files found for merging:" ':\fl.b       For Each curFile In fList gwSN>oj &           Print Chr(9) & curFile ieo|%N{'       Next g/8.W   I#U>5"%\a       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. {)V?R       Dim nameArray() As String, sampName As String hojHbm m4       nameArray = Split(fList(0)," 0-0.txt") EJZ@p7*Oj       sampName  = nameArray(0) xMDrE?       Print "" z wL3,!t       Print "Sample name: " & Chr(9) & sampName >[ug zJ   a`H\-G       'Open an output file and write the FRED header data .3VK;au\\       Dim outFile As String `,wcQ       outFile = cDir & sampName & "_FRED.txt" _i3i HR?       Open outFile For Output As #1 ~{L.f94N       Print #1, "type bsdf_data" 'h-3V8m^e       Print #1, "format angles=deg bsdf=value scale=1" fokwW}>B[f   #B @X       'Loop the file list, skip the two header lines and write the remaining data to file gbm0H-A:*       Dim lineArray() As String, curLine As Long RT%x&j       For Each curFile In fList J&M1t#UN           Print "Merging data from file " & curFile fO].e"}           ReadFile( cDir & curFile, lineArray ) \bhOPK>w           For curLine = 2 To UBound(lineArray) 1~%o}+#-               Print #1, lineArray(curLine) I4)Nb WQ           Next fNkuX-om       Next XQ]`&w (   Kb}MF9?:e       'Close the output file q0&Wk"X%rr       Close #1 Lf >YdD   fr+@HUOxsl       Print "Finished merging RPC data for sample " & sampName [?-]PZ       Print "FRED formatted data file: " & Chr(9) & outFile *^'wFbaBO   End Sub hwiKOP   I(pb-oY3!I   'Utility function to read the contents of a file into an array of strings. D7)(D4S4   Function ReadFile(ByVal fileName As String, _ lDo(@nM                     ByRef lineArray() As String) As Long Bg-VCJI<   SO`dnf       ReadFile = -1 QwBXlO?       Dim oFSO As Object JwZ?hc       Set oFSO = CreateObject("Scripting.FileSystemObject") xw?CMA       Erase lineArray zK=dzoy   o]A XT 8       Dim fid As Long 5^yG2&>#       If oFSO.fileexists( fileName ) Then (vKI1^,           fid = FreeFile() kl" ]Nw'C           Open fileName For Input As fid hp*<x4%*a"           lineArray = Split(Input(LOF(fid), fid), vbCrLf) t\8&*(&3F           Close fid N[pZIH5ho=       End If !Cw!+fZ\l       Set oFSO = Nothing MU|{g 5/ )       Return UBound( lineArray ) E#8 _hT]5   [OzzL\)3l   End Function lzEb5mg   [[w2p   Sub GetFileList( ByVal in_dir As String, _ 6*Zj]is                    ByRef in_flist() As String ) ,+se   Pey//U       'Redimension the file list array Km,*)X.-5       Erase in_flist 4.8nY\_WF   4d0#86l~J/       'Tracks how many files are found B| tzF0;c       Dim fCount As Long jeq:       fCount = 0 u,eZ6   z>G;(F2       'Recurse directory and search for text files vf<UBa;Xm       Dim f As String ;UrK{>B       f = Dir$(in_dir & "*.txt") >B_n/v3P(M       While f <> "" ^_68]l=           ReDim Preserve in_flist(fCount) n+HsQ]z.           in_flist(fCount) = f H-(q#?:           fCount += 1 Ea4_Qmn           f = Dir$() rnO0-h-;       Wend x`2| }AP(       ReDim Preserve in_flist(fCount-1)