RPC Photonics扩散片BSDF

]CF-#q}'   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

y Ne ?a{   摘要： -$W1wb9z   ":$4/b6   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。 +Q u.86dH   yf9"Rc~+   背景： U}5fjY   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。 f-enF)z   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 0WC\uxT7   m;~}}~&vQ   >^~^ #MT   ):'wxIVGI   步骤 4`Ud\Jm[s   M!'d   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?WRCB   图2. RPC Photonics工程漫射体不同类型的散射数据 u-t=M]   7S}0Kuk)   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） UsyNn39   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 Jz`jN~   例如下所示： p[JIH~nb   Sample name:  EDF-C1-56 4>=M"DhB   Merging data from file EDF-C1-56 0-0.txt 2.aCo, Kb;   Finished merging RPC data for sample EDF-C1-56 >`0U2K   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt @v%Kwe1Q   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 `.MZ,Xhqi"   a. 创建一个新的散射库 rNq*z,   b. 散射模型命名 S vM\9   c. 改变散射模型为“Tabulated BSDF”. D{N8q^Cs9   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 ） ^wolY0p   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。 FB[b]+t`D{   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， kM506U<g   g. 点击OK F, Q;sq   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 :')[pO_FW*   Bib<ySCre   gS'{JZu2   脚本代码： H7X-\K 1w   P`lv_oV   '#Language "WWB-COM" |T6K?:U7   MM@,J<   Option Explicit 2'?'dfj   tLy:F*1i   Sub Main WiytHuUF   aj`&ca8       'Cleanup 2|>\A.I|=       ClearOutputWindow() >}V?GK36   !"F;wg$       Print "Merging RPC Photonics BSDF Data Files" lAU99(GXV       SetTextColor(255,0,0) +]%S}<R       Print "Note: Script should be located in the same folder as the BSDF TXT files." zL yI|%KH       Print "Note: Do not run this script multiple times without deleting the output file between executions." XYo,5-       SetTextColor(0,0,0) TN0KS]^A3   eB5>uKa       'Current directory of this script (should be the same as the text files being merged) N]+6<       Dim cDir As String vUpAW[[       cDir = MacroDir$ & "\" m8fj\,X   ]W5*R07       'Array which will be populated with the list of files to be merged 2$Mnwxfk       Dim fList() As String, curFile As String <c}@lj-j       GetFileList( cDir, fList ) ({!!b"B2   XR+ SjCA       Print "" .H)H9cmf       Print "Files found for merging:" 3IMvtg       For Each curFile In fList >_?i)%+)           Print Chr(9) & curFile q}P@}TE       Next eq6O6-   tY"eoPme       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. bT D?uX!^@       Dim nameArray() As String, sampName As String MLWHO$C~T       nameArray = Split(fList(0)," 0-0.txt") dVb6u       sampName  = nameArray(0) IA`voO$       Print "" 7_\sx7h{3       Print "Sample name: " & Chr(9) & sampName Nj>6TD81u   :lB*kmg       'Open an output file and write the FRED header data P-\f-FS       Dim outFile As String eg;7BZim{       outFile = cDir & sampName & "_FRED.txt" lMY\8eobcB       Open outFile For Output As #1 .C^P6S2oJ       Print #1, "type bsdf_data" z(\aJW       Print #1, "format angles=deg bsdf=value scale=1" *E/Bfp1LIe   $f =`fPo       'Loop the file list, skip the two header lines and write the remaining data to file !zE{`Ha~       Dim lineArray() As String, curLine As Long ;JkSZs3       For Each curFile In fList Yqs=jTq`{           Print "Merging data from file " & curFile ?Y~t{5NJR           ReadFile( cDir & curFile, lineArray ) [bh?p+V           For curLine = 2 To UBound(lineArray) TWRP|i!i               Print #1, lineArray(curLine) H+[?{+"#@l           Next kOQ)QX       Next B(W~]i   Av.tr&ZNb       'Close the output file \L*%?~       Close #1 \jC ) ;mk   ['mpxtG       Print "Finished merging RPC data for sample " & sampName j[r}!;O       Print "FRED formatted data file: " & Chr(9) & outFile d1D f`   End Sub 9mi@PW}1   HgQjw!   'Utility function to read the contents of a file into an array of strings. v,-Tk=qP   Function ReadFile(ByVal fileName As String, _ O=o}uB-*6                     ByRef lineArray() As String) As Long W>pe-   J>_mDcPo       ReadFile = -1 =!\Nh,\eQ       Dim oFSO As Object +VUkV-kP       Set oFSO = CreateObject("Scripting.FileSystemObject") rbd0`J9fq       Erase lineArray ^Hn}\5   ,%9XG077       Dim fid As Long \ja6g       If oFSO.fileexists( fileName ) Then #<0Hvde           fid = FreeFile() &ivU4rEG           Open fileName For Input As fid | 1B0           lineArray = Split(Input(LOF(fid), fid), vbCrLf) jW:7PS           Close fid J||g(+H>       End If 07.p {X R       Set oFSO = Nothing if'=W6W       Return UBound( lineArray ) S F)$b   r)t[QoD1   End Function >fC&bab   84(Jo_9   Sub GetFileList( ByVal in_dir As String, _ ]ae(t`\l^                    ByRef in_flist() As String ) 1`8s "T   Wg}KQ6 6       'Redimension the file list array p cLKE ZK       Erase in_flist l+Wux$6U   8>C4w 5kF       'Tracks how many files are found ,Q"'q0hM=       Dim fCount As Long {vD$odi       fCount = 0 \:m~ +o$<-   n5QO'Jr%[       'Recurse directory and search for text files $1])>m_ct       Dim f As String }U7IMONU       f = Dir$(in_dir & "*.txt") N]W*ei       While f <> "" WM+8<|)n           ReDim Preserve in_flist(fCount) ,l&?%H9q           in_flist(fCount) = f !td!">r46e           fCount += 1 0ca0-vY           f = Dir$() %B@NW2ZQ[       Wend ROkwjw       ReDim Preserve in_flist(fCount-1)