RPC Photonics扩散片BSDF

vqZM89xY   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

=Fl4tY#X   摘要： !$#4D&T   FY*0gp   RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 Dy@NgHe   A|Gqjy^;@   背景： GFkte   Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 )pa|uH+N   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 .tsB$,/   vUeel%   y36aoKH   N6%q%7F.:   步骤 x:lf=DlA   RE$-{i   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 W78-'c   图2. RPC Photonics工程漫射体不同类型的散射数据 W<7Bq_L[|   [_1G\z_iE   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） JdEb_c3S   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 >[=`{B   例如下所示： 7z&u92dJI   Sample name:  EDF-C1-56 (@ sKE   Merging data from file EDF-C1-56 0-0.txt uB5o Ghu-   Finished merging RPC data for sample EDF-C1-56 y-k-E/V}   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 6mLE-( Z7   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 GefgOlg5"   a. 创建一个新的散射库 q)zvePO#   b. 散射模型命名 QNEaj\   c. 改变散射模型为“Tabulated BSDF”. kICYPy   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） b6BIDuRb   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 p?nVPTh   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， Q Ll44*@   g. 点击OK SUhP e+   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 9z}kkYk   R!CUR~F   6V/mR~F1r   脚本代码： 6fyW6xv[,   ,fFJSY^   '#Language "WWB-COM" I9m   W>Kn*Dy8~   Option Explicit cG6+'=]3<   ;ecF~-oku   Sub Main 4R6 .G O   r$zXb9a|<       'Cleanup ]A[~2]       ClearOutputWindow() +.St"f/1   ,0xN#&?Ohh       Print "Merging RPC Photonics BSDF Data Files" G>"[nXmcu       SetTextColor(255,0,0) u e~1144       Print "Note: Script should be located in the same folder as the BSDF TXT files." ?'r[P03       Print "Note: Do not run this script multiple times without deleting the output file between executions." '/?&Gol-       SetTextColor(0,0,0) p*A//^wQ   5T`39[Fya       'Current directory of this script (should be the same as the text files being merged) q~C6+       Dim cDir As String YQJ_t@0C       cDir = MacroDir$ & "\" FliN@RNo   **"sru;@=       'Array which will be populated with the list of files to be merged uIBV1Qz       Dim fList() As String, curFile As String S1JB]\       GetFileList( cDir, fList ) V qf}(3K0   M Cz3RZK       Print "" [gDvAtTZ 5       Print "Files found for merging:" O^GTPYW       For Each curFile In fList EBm\rM8           Print Chr(9) & curFile X8<ygci+.5       Next y|ZJ-[qg   ~mU#u\r(*       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. #'T@mA       Dim nameArray() As String, sampName As String WqAP'x 1       nameArray = Split(fList(0)," 0-0.txt") HU'}c*d]       sampName  = nameArray(0) 6|9fcIh]B       Print "" I|hG"i       Print "Sample name: " & Chr(9) & sampName 0@KBQv"v   $!t!=       'Open an output file and write the FRED header data F6Ixu_s       Dim outFile As String 2C>PxA6l       outFile = cDir & sampName & "_FRED.txt" 3D3K:K!FK       Open outFile For Output As #1 (1R,       Print #1, "type bsdf_data" DEtq]|80m       Print #1, "format angles=deg bsdf=value scale=1" |<S9nZg%p   `YJ`?p       'Loop the file list, skip the two header lines and write the remaining data to file 6K&V}       Dim lineArray() As String, curLine As Long u:k#1Nn!       For Each curFile In fList ~$5[#\5%G           Print "Merging data from file " & curFile ) Ez=#dIq           ReadFile( cDir & curFile, lineArray ) wTLHg2'y^           For curLine = 2 To UBound(lineArray) _h#G-               Print #1, lineArray(curLine) -$*YN{D+           Next v^pE=f*/       Next _\"?:~rUN   cB TMuDT_       'Close the output file ,PnEDQ|l       Close #1 !#3R<bW`R8   ?tOzhrv       Print "Finished merging RPC data for sample " & sampName }'3V(;9       Print "FRED formatted data file: " & Chr(9) & outFile 7G xNI   End Sub ][9M_.   v/)dsSNZ0u   'Utility function to read the contents of a file into an array of strings. y RAb HG,c   Function ReadFile(ByVal fileName As String, _ @$aCUJ/mE                     ByRef lineArray() As String) As Long 6SpkeXL   OLv(       ReadFile = -1 E~24b0<7       Dim oFSO As Object Z)HQlm       Set oFSO = CreateObject("Scripting.FileSystemObject") aJ2-BRn       Erase lineArray \Ew2@dF{O   ,}bC       Dim fid As Long 7XZ!UC;i       If oFSO.fileexists( fileName ) Then UOq$88sr           fid = FreeFile() ]wP)!UZ           Open fileName For Input As fid ,Ti#g8j           lineArray = Split(Input(LOF(fid), fid), vbCrLf) D[<8(~VP           Close fid 7Y_S%B:F       End If 4ed( DSN       Set oFSO = Nothing <K)^MLgN       Return UBound( lineArray ) 9nB:=`T9   %Dya-   End Function 6$IAm#   o rEo$e<   Sub GetFileList( ByVal in_dir As String, _ -~jM=f$                    ByRef in_flist() As String ) QkA79%;j   [z?q-$#       'Redimension the file list array jA6:-Gz       Erase in_flist K'y;j~`-   ~$+9L2gz       'Tracks how many files are found Z_S~#[\7^]       Dim fCount As Long norWNm(n       fCount = 0 -O{Af   J)66\ h=       'Recurse directory and search for text files }F-WOQ       Dim f As String ms<?BgCSz       f = Dir$(in_dir & "*.txt") q[r|p"TGov       While f <> "" WJ=^r@Sf           ReDim Preserve in_flist(fCount) 5gi`&t`           in_flist(fCount) = f XjWoUnz           fCount += 1 0,,x|g$TpT           f = Dir$() s fazrz`h       Wend U<*ZY`B3       ReDim Preserve in_flist(fCount-1)