RPC Photonics扩散片BSDF

0Ia8x?80V   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

&!=[.1H<   摘要： 3%'Y):   r: :LQ$   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。 S7fX1y[   >I^_kBa   背景： (uk-c~T!u   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。 kbHfdA   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 /O$7A7Tl   ^o@N.+`&<   K:3u/C`   vXP+*5d/ K   步骤 +YA,HhX9   F4|Z:e,Hr   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 j$u=7Z&E   图2. RPC Photonics工程漫射体不同类型的散射数据 ^jiYcg@_[   lz-t+LD@ST   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） 4U1!SR]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 |8:IH@K*   例如下所示： -? |-ux   Sample name:  EDF-C1-56 x%WL!Lo   Merging data from file EDF-C1-56 0-0.txt <PayP3E   Finished merging RPC data for sample EDF-C1-56 X4bB   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt M'"@l$[QM   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 U fzA/   a. 创建一个新的散射库 {ejJI/o0   b. 散射模型命名 U~)i&":sN   c. 改变散射模型为“Tabulated BSDF”. I5$@1+B   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 ） qyx  '   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。 WN+D}z]   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， uoIvFcb^   g. 点击OK |1@/gqa   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 vp>,}nx4   iLy J7zby   fF"\$Ny   脚本代码： $<~o,e-4   0)?.rthk4S   '#Language "WWB-COM" \U0p?wdr:   xD#r5   Option Explicit h)MU^aP   J=*X%^jX9Z   Sub Main )G a%Eg9   u$"dL=s!       'Cleanup is2OJ,       ClearOutputWindow() "i}?jf {a   l.V{H<v}       Print "Merging RPC Photonics BSDF Data Files" Fk(+S:{yQ       SetTextColor(255,0,0) 3V,$FS]       Print "Note: Script should be located in the same folder as the BSDF TXT files." "'@iDq%y       Print "Note: Do not run this script multiple times without deleting the output file between executions." 5$(qnOi       SetTextColor(0,0,0) |#6B<'e'   aMxg6\8       'Current directory of this script (should be the same as the text files being merged) z^KMYvH g       Dim cDir As String " ^t3VjN       cDir = MacroDir$ & "\" g.&n X/   O e-FI+7       'Array which will be populated with the list of files to be merged .??[qBOTE       Dim fList() As String, curFile As String E%?X-$a       GetFileList( cDir, fList ) y rSTU-5u   H\zV/1~Y       Print "" SnK#YQCDt       Print "Files found for merging:" DRo?7_       For Each curFile In fList i#uc           Print Chr(9) & curFile W'>"E/Tx#O       Next x*Lm{c5+   G,VTFM6       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 0Y%u[i/       Dim nameArray() As String, sampName As String !rK,_wH       nameArray = Split(fList(0)," 0-0.txt") yX^/Oc@j       sampName  = nameArray(0) #6'x-Z_       Print "" rF/k$_bFt       Print "Sample name: " & Chr(9) & sampName 9^DXw!   20Umjw.D       'Open an output file and write the FRED header data {Qe7/ln!       Dim outFile As String h Sg4A=y       outFile = cDir & sampName & "_FRED.txt" 7j9X<8*       Open outFile For Output As #1 XLog+F$`       Print #1, "type bsdf_data" zA~aiX       Print #1, "format angles=deg bsdf=value scale=1" MJ=(rp=YU9   =54"9*       'Loop the file list, skip the two header lines and write the remaining data to file sQ4~oZZ       Dim lineArray() As String, curLine As Long -f{NVX\<0       For Each curFile In fList c"|4'#S           Print "Merging data from file " & curFile ai3wSUYJi           ReadFile( cDir & curFile, lineArray ) &Z.zem?n           For curLine = 2 To UBound(lineArray) #@i1jZ               Print #1, lineArray(curLine) 3M?vK(zG>P           Next CDNh9`       Next 5._=m" Pl   Cwb}$=p'       'Close the output file 55mDLiA       Close #1 #o(c=   ^lt;K{       Print "Finished merging RPC data for sample " & sampName eJ=K*t|       Print "FRED formatted data file: " & Chr(9) & outFile m(CbMu   End Sub 3I" <\M4x   /C'dW   'Utility function to read the contents of a file into an array of strings. &fyT}MA   Function ReadFile(ByVal fileName As String, _ &s+F+8"P+                     ByRef lineArray() As String) As Long B%.XWW$   p+t79F.js       ReadFile = -1 f|U J%}$v;       Dim oFSO As Object v>4kF _N       Set oFSO = CreateObject("Scripting.FileSystemObject") 2l8TX#K       Erase lineArray tn"n~;Bh?:   b8>2Y'X       Dim fid As Long !6yyX}%o       If oFSO.fileexists( fileName ) Then wva| TZ           fid = FreeFile() :~% zX*           Open fileName For Input As fid hj8S".A_           lineArray = Split(Input(LOF(fid), fid), vbCrLf) voD0u           Close fid 4!I;U>b b       End If *Dz<Pi^       Set oFSO = Nothing bnm3 cR:h"       Return UBound( lineArray ) "1-|ahW   ';CL;A;   End Function kOQq +_Y   f`[gRcZ-   Sub GetFileList( ByVal in_dir As String, _ No'^]r                    ByRef in_flist() As String ) aCwb[7N   b 6LwKUl       'Redimension the file list array P+hp'YK1       Erase in_flist +1R qo   1z#0CX}Y/H       'Tracks how many files are found TqZ&X|G       Dim fCount As Long [h3y8O       fCount = 0 3Mw2;.rk   a9w1Z4       'Recurse directory and search for text files ^EG@tB $<       Dim f As String OE"r=is       f = Dir$(in_dir & "*.txt") #U=}Pv~wM       While f <> "" _F"o0K!u           ReDim Preserve in_flist(fCount) v4YY6?4           in_flist(fCount) = f :We}l;.jQ           fCount += 1 2f=7`1RCD           f = Dir$() Z6`oGFq       Wend 4raKhN"       ReDim Preserve in_flist(fCount-1)