RPC Photonics扩散片BSDF

"w__AYHV   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

rU1Ri   摘要： #G=AD/z   Ep3I*bQ Y   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。 A,3qjd,$ c   n+k,:O5   背景： M0`1o p1   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。 )UyJ.!Fly   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 &2I8!Ia   s-~`Ao' <   "{zqXM}:C   VCvf'$4 (X   步骤 k(_OhV _   ?-8DS5   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 q$Ms7`a   图2. RPC Photonics工程漫射体不同类型的散射数据 aX Ie   ?TI]0)   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） hFxT@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 <2~DI0pp(   例如下所示： ew]G@66   Sample name:  EDF-C1-56 m!=5Q S3Z   Merging data from file EDF-C1-56 0-0.txt 1qBE|PwBp   Finished merging RPC data for sample EDF-C1-56 }w8y YI   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt DfVJ~,x~   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 =&(e *u_   a. 创建一个新的散射库 1/K1e$r   b. 散射模型命名 ($W%&(:/   c. 改变散射模型为“Tabulated BSDF”. [jrfh>v   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 ） MH0wpHz   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。 .L]5,#2([   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， {dn:1IcN   g. 点击OK s)KlKh   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 $\bVu2&I   B+Ft >   +;M 5Sp   脚本代码： 1GB ]Yi[>   ]Tg@wMgI   '#Language "WWB-COM" bm4Bq>*=U   -eIo   Option Explicit R.vOYzo   eKZS_Qd   Sub Main N"> #fYix   WNKg>$M       'Cleanup nHRk2l|       ClearOutputWindow() DsbTx.vA   .k +>T*c{       Print "Merging RPC Photonics BSDF Data Files" fNfa.0s       SetTextColor(255,0,0) R0LWuE%eD       Print "Note: Script should be located in the same folder as the BSDF TXT files." 0,Ib74N'w       Print "Note: Do not run this script multiple times without deleting the output file between executions." a'.7)f[g}       SetTextColor(0,0,0) kGYsjhL\d   `"<hO 'WU       'Current directory of this script (should be the same as the text files being merged) }^j8<       Dim cDir As String ^ meU&       cDir = MacroDir$ & "\" ]qu6/Z   )=MK&72r       'Array which will be populated with the list of files to be merged )jg*u}u 0       Dim fList() As String, curFile As String '>n&3`r5       GetFileList( cDir, fList ) P#`M8k   OEXa}K#       Print "" A1`6+8}o;b       Print "Files found for merging:" <5P*uZ       For Each curFile In fList  + #E?)           Print Chr(9) & curFile a|.IAxJ       Next )+=Kh$VbS    7Z<GlNv       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. sUK|*y       Dim nameArray() As String, sampName As String |5X59! JL       nameArray = Split(fList(0)," 0-0.txt") "*N#-=MJF       sampName  = nameArray(0) e6 x#4YH       Print "" DS>&|zF5l       Print "Sample name: " & Chr(9) & sampName -$I30.#   2oRwDg&7|       'Open an output file and write the FRED header data %<[{zd1C-       Dim outFile As String `~"'\Hw       outFile = cDir & sampName & "_FRED.txt" >5"e<mwD7d       Open outFile For Output As #1 Un,'a8>V`       Print #1, "type bsdf_data" 5??}9       Print #1, "format angles=deg bsdf=value scale=1" qswC>Gi   q9{)nU       'Loop the file list, skip the two header lines and write the remaining data to file /!A"[Tyt       Dim lineArray() As String, curLine As Long !.q9:|oc       For Each curFile In fList j(]O$""           Print "Merging data from file " & curFile "5O>egt           ReadFile( cDir & curFile, lineArray ) EltCtfm`           For curLine = 2 To UBound(lineArray) qSG0TWD!pq               Print #1, lineArray(curLine) }4H}*P>+           Next "#-iD       Next )*{B_[   !MOsP<2       'Close the output file 96 QY0       Close #1 b4bd^nrqV   GKSF(Tnj       Print "Finished merging RPC data for sample " & sampName tcsb]/my       Print "FRED formatted data file: " & Chr(9) & outFile 0GeL">v,:=   End Sub VBF: MAA    fjl9*   'Utility function to read the contents of a file into an array of strings. ->.9[|lIg   Function ReadFile(ByVal fileName As String, _ #N>66!/V                     ByRef lineArray() As String) As Long <eS/-W%n6   /j4G}       ReadFile = -1 F;h^o!W7r       Dim oFSO As Object (w5cp!qW9J       Set oFSO = CreateObject("Scripting.FileSystemObject") gO"G/       Erase lineArray VKX|0~   _@[W[=|H       Dim fid As Long lNyyLLt       If oFSO.fileexists( fileName ) Then 5B2p_$W#           fid = FreeFile() x9a\~XL>a           Open fileName For Input As fid 9&.md,U'           lineArray = Split(Input(LOF(fid), fid), vbCrLf) bHE.EBZ           Close fid US"g>WLwJ       End If fDfph7[)       Set oFSO = Nothing svl!"tMXl       Return UBound( lineArray ) xS5 -m6/   j|K;Yi   End Function 3o?eUwI}   >dm9YfQ   Sub GetFileList( ByVal in_dir As String, _ eI2HTFyT                    ByRef in_flist() As String ) Q~svtN   .Wy'       'Redimension the file list array 'ROz|iJ       Erase in_flist GN! R<9   E?P>s T3B       'Tracks how many files are found >(.|oT\Tb       Dim fCount As Long <f8j^       fCount = 0 xsJXf @   EK"/4t{L_       'Recurse directory and search for text files K[OOI~"C       Dim f As String 6o3#<ap<       f = Dir$(in_dir & "*.txt") (B\ UZb       While f <> "" GWPBP-)0           ReDim Preserve in_flist(fCount) c!7WRHJE_a           in_flist(fCount) = f ~S;-sxoO0l           fCount += 1 ; YQB           f = Dir$() 7kE+9HmfMk       Wend 3x+=7Mg9       ReDim Preserve in_flist(fCount-1)