RPC Photonics扩散片BSDF

st^N QL   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

;C@^wI   摘要： ^C#bW<T   ]$%4;o4O   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。 fXR_)d   Ge R-k9   背景： 8J@OMW&[l   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。 rY+1s^F   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 T_ #oMXZ/   z+`)|c4-   JN|#   Tp.iRFFkP   步骤 U0=zuRr n   =Qq^=3@h   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。 00 ,jneF   图2. RPC Photonics工程漫射体不同类型的散射数据 1T^L) %&p_   23?0'AU   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） mAERZ<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 v[=E f   例如下所示： Ya{1/AaM   Sample name:  EDF-C1-56 3S21DC @Y   Merging data from file EDF-C1-56 0-0.txt 9O_N iu0   Finished merging RPC data for sample EDF-C1-56 |Y8o+O_`   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt _A~gqOe   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 vWga>IGM   a. 创建一个新的散射库 Oc3%pb;   b. 散射模型命名 8x z7S   c. 改变散射模型为“Tabulated BSDF”. <W{0@?y   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 ） %HS!^j3C%   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。 pNsLoNZ3w   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， @_Oe`j^   g. 点击OK meWq9:z   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 =1?yS3   fXQRsL8 ]   [l{e J/W   脚本代码： )xs,   L-TVe   '#Language "WWB-COM" O/~^}8TLL   =&xoyF   Option Explicit `a9>4   vG}oo   Sub Main cC]1D*Bn   )SLs  [       'Cleanup )o,0aGo>Of       ClearOutputWindow() Rb*\A7o|;   W.<<azi       Print "Merging RPC Photonics BSDF Data Files" ^!tI+F{n{       SetTextColor(255,0,0) fL:Fn"Nv       Print "Note: Script should be located in the same folder as the BSDF TXT files."  6S&YL       Print "Note: Do not run this script multiple times without deleting the output file between executions." VG7#6)sQoK       SetTextColor(0,0,0) | Ylk`<   N$ b;8F       'Current directory of this script (should be the same as the text files being merged) N/=3Bs0y-       Dim cDir As String e@By@r&nql       cDir = MacroDir$ & "\" B\yq%m   H|O}Dsj       'Array which will be populated with the list of files to be merged boon=;{p       Dim fList() As String, curFile As String {P+[CO       GetFileList( cDir, fList ) jXR+>=_   4Fq}*QJ-       Print "" #+\G- =-       Print "Files found for merging:" K@lV P!z       For Each curFile In fList SsZzYj.d           Print Chr(9) & curFile _\[G7       Next &o.SmkJI   'h=2_%l@Y       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 8m0sEV>       Dim nameArray() As String, sampName As String B:.rp.1        nameArray = Split(fList(0)," 0-0.txt") s9>!^MzBK       sampName  = nameArray(0) VV0$L=mo       Print "" :Yqa[._AF       Print "Sample name: " & Chr(9) & sampName Hq$|j,&?   sxtGl^,mU:       'Open an output file and write the FRED header data `Mg "!n`       Dim outFile As String U4JN ,`p{       outFile = cDir & sampName & "_FRED.txt" ?YO%]mTP       Open outFile For Output As #1 }fZBP]<I(       Print #1, "type bsdf_data" PMcyQ2R->       Print #1, "format angles=deg bsdf=value scale=1" f'S"F   l<?wB|1'       'Loop the file list, skip the two header lines and write the remaining data to file " cg>g/       Dim lineArray() As String, curLine As Long 8),Y|4       For Each curFile In fList :Ib\v88WIv           Print "Merging data from file " & curFile 0b'R5I.M           ReadFile( cDir & curFile, lineArray ) a$m?if=           For curLine = 2 To UBound(lineArray) J)o%83//               Print #1, lineArray(curLine) ).xWjVC           Next Dl{Pd`D       Next ><~hOK?v   mr? ii       'Close the output file %+~0+ev7r       Close #1 |~Iw   $P_Y8:       Print "Finished merging RPC data for sample " & sampName WW=7QCi       Print "FRED formatted data file: " & Chr(9) & outFile U^D7T|P$V   End Sub 3$54*J   Tx_LH"8   'Utility function to read the contents of a file into an array of strings. <*P1Sd.   Function ReadFile(ByVal fileName As String, _ l<+k[@Vox                     ByRef lineArray() As String) As Long VbjW$?   2Z~ofrj       ReadFile = -1 ??PpHBJ')       Dim oFSO As Object q`hg@uwA{`       Set oFSO = CreateObject("Scripting.FileSystemObject") $ }53f'QjW       Erase lineArray {;U:0BPI3   :nI.Qa'"H       Dim fid As Long 2ip~qZNw><       If oFSO.fileexists( fileName ) Then *6L^A`_1]           fid = FreeFile() @Klj!2cv$           Open fileName For Input As fid P;34Rd           lineArray = Split(Input(LOF(fid), fid), vbCrLf) gK /K Z8           Close fid 7+"X^$       End If {8Ll\j@ "       Set oFSO = Nothing {+;8dtZ)x       Return UBound( lineArray ) Tb^9J7]   F+GQl   End Function !k:j+h/   jolCR-FDu   Sub GetFileList( ByVal in_dir As String, _ Ts\7)6|F                    ByRef in_flist() As String ) W3b\LnUa   2r,fF<WQ       'Redimension the file list array myXV~6R 3       Erase in_flist 0^=S:~G   i!NGX       'Tracks how many files are found PA E)3       Dim fCount As Long r"+ WUU       fCount = 0 'py k   4?Io@[7A)       'Recurse directory and search for text files vzL>ZBe Z       Dim f As String x{m)I<.:       f = Dir$(in_dir & "*.txt") ,3wo       While f <> "" {RK#W~h           ReDim Preserve in_flist(fCount) wP%;9y2B           in_flist(fCount) = f z,)Fvs4U.           fCount += 1 HwHI$IB           f = Dir$() f: Rh9       Wend cMj<k8.{       ReDim Preserve in_flist(fCount-1)