RPC Photonics扩散片BSDF

&OK(6o2m;   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

FF6[qSV   摘要： oqB(l[%z2   rV)mcfw:Z   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。 gpVZZ:~   mEv<r6qDT   背景： 9xyj,;P>   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。 d3_aFsQ   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 dE^:-t   IUAx*R   r#JE7uneT   s[NkPh9&   步骤 $FZ~]Ef   "n,">   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 m{x[q   图2. RPC Photonics工程漫射体不同类型的散射数据 zJ93EtlF   ?<]BLkx   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） _,"T;i   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 w<<>XIL   例如下所示： v{$X2z_$w   Sample name:  EDF-C1-56 21bvSK   Merging data from file EDF-C1-56 0-0.txt  U2   Finished merging RPC data for sample EDF-C1-56 wUW^ O   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q4Zuz)r*   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 X#'DS&{   a. 创建一个新的散射库 )."_i64   b. 散射模型命名 YD H!Nl   c. 改变散射模型为“Tabulated BSDF”. m.pB]yq&   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 ） KPSFy<   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。 UBzX%:A   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， Fm_^7|   g. 点击OK ? [l[y$9   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 /17Qhex   ^[,Q2MHCT(   :f G5?])   脚本代码： _t||v   K#_&}C^-jY   '#Language "WWB-COM" t'|A0r$   L15?\|': Y   Option Explicit 3p6QJuSB   rn $a)^!   Sub Main xHq"1Vs=   "XlNKBgM       'Cleanup GPz0qK       ClearOutputWindow() n^B9Mh@   C-E~z{       Print "Merging RPC Photonics BSDF Data Files" c[J?`8       SetTextColor(255,0,0) GK.^Gd       Print "Note: Script should be located in the same folder as the BSDF TXT files." b3F)$UQ       Print "Note: Do not run this script multiple times without deleting the output file between executions." :7UC=GKQk       SetTextColor(0,0,0) Yz]c'M@   ADK)p?       'Current directory of this script (should be the same as the text files being merged) `qnp        Dim cDir As String Z^E>)!t       cDir = MacroDir$ & "\"  <*EMcZ   Swz{5 J2C       'Array which will be populated with the list of files to be merged )UbPG`x8       Dim fList() As String, curFile As String $9+|_[ ]v.       GetFileList( cDir, fList ) |0ATH`{   g xY6M4       Print "" 94VtGg=b}       Print "Files found for merging:" 3.+TM]RYN       For Each curFile In fList [p3{d\=*?           Print Chr(9) & curFile m:B9~lbT+       Next vZ,DJ//U,   `NYu|:JK:       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 60,z!Vv       Dim nameArray() As String, sampName As String 2(LF @xb       nameArray = Split(fList(0)," 0-0.txt") @W}cM       sampName  = nameArray(0) 'yxN1JF       Print "" H3-(.l[!b)       Print "Sample name: " & Chr(9) & sampName [As9&]Bv5   Zc9@G-       'Open an output file and write the FRED header data <G|i!Pm       Dim outFile As String _P T5       outFile = cDir & sampName & "_FRED.txt" 9d&@;&al       Open outFile For Output As #1 YBh|\       Print #1, "type bsdf_data" aItQ(+y       Print #1, "format angles=deg bsdf=value scale=1" ' ` _TFTO   GWFF.Mo^       'Loop the file list, skip the two header lines and write the remaining data to file V=^B7a.;>       Dim lineArray() As String, curLine As Long F!7dGa$       For Each curFile In fList ezimQ           Print "Merging data from file " & curFile Jq>rA           ReadFile( cDir & curFile, lineArray ) Vu.VH([b]Q           For curLine = 2 To UBound(lineArray) O6*2oUKqK               Print #1, lineArray(curLine) M[ {O%!           Next "DaE(S&       Next Zt_~Zxn3   m`i_O0T       'Close the output file u7&q(Z&&O       Close #1 &Va="HNKt   <OY (y#x       Print "Finished merging RPC data for sample " & sampName q QcQnd2K       Print "FRED formatted data file: " & Chr(9) & outFile e"oTlB   End Sub /RVwhA+c   '0-YFx'U0V   'Utility function to read the contents of a file into an array of strings. umT *   Function ReadFile(ByVal fileName As String, _ Gj_7wP$                     ByRef lineArray() As String) As Long >$$z6A[   /< k&[       ReadFile = -1 y1{TVpN       Dim oFSO As Object P~ : N       Set oFSO = CreateObject("Scripting.FileSystemObject") 6ChFsteGFr       Erase lineArray U$yy7}g   8Y4mTW       Dim fid As Long GP>\3@>       If oFSO.fileexists( fileName ) Then hrNB"W|?x           fid = FreeFile() s$%t2UaV           Open fileName For Input As fid !"2S'oQKS           lineArray = Split(Input(LOF(fid), fid), vbCrLf) Hf/ZaBn           Close fid |\zzOfaO       End If |v:oLgUdH       Set oFSO = Nothing }!Y=SP1e       Return UBound( lineArray ) l~]D|92   < Y]e   End Function ;NOmI+t0w&   .k:heN2-x   Sub GetFileList( ByVal in_dir As String, _ },n?                    ByRef in_flist() As String ) ?g\emhG   nb<e<>L       'Redimension the file list array rD+mI/_J`       Erase in_flist h1t~hrq   wz'=       'Tracks how many files are found =t^jlb       Dim fCount As Long 8.,d`~       fCount = 0 TZ63=m   ?7>"ZGDe>       'Recurse directory and search for text files 5 cGQ`l       Dim f As String ?K+q~DzNSD       f = Dir$(in_dir & "*.txt") b)@D@K"5       While f <> "" 4O{G^;           ReDim Preserve in_flist(fCount) cYp /? \           in_flist(fCount) = f a^={X<K|/           fCount += 1 It7R}0Smg           f = Dir$() UX+vU@Co[       Wend % x.du9       ReDim Preserve in_flist(fCount-1)