RPC Photonics扩散片BSDF

N [iv.B   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

?3 l4U   摘要： m!-,K8   `d[ja,   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。 Nn;p1n dN   " %)zTH   背景： f}1R,N_fC   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。 (X"WEp^Q{I   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 Kqt,sJ   ^"!j m   J0vCi}L   1Gojuey   步骤 b8@gv OB   [j:]YR   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。 wKq-|yf,   图2. RPC Photonics工程漫射体不同类型的散射数据 naT;K0T=   ,^UNQO*{GI   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） k*8 ld-O   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 KF[P /cFI   例如下所示： G=lke t6   Sample name:  EDF-C1-56 noBGP/Av=:   Merging data from file EDF-C1-56 0-0.txt 0V&6"pF_Y'   Finished merging RPC data for sample EDF-C1-56 7]~65@%R-&   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 0{PRv./`   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 :/kz*X=<   a. 创建一个新的散射库 k2xOu9ncEj   b. 散射模型命名 /k(KA [bS   c. 改变散射模型为“Tabulated BSDF”. t(|\3$z   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） ;{e;6Hq   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 ;nPjyu'g   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， 'o#ve72z1   g. 点击OK QJaF6>m   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 fr1/9E;   od7 [h5r   S;vE%   脚本代码： B!=JRfT   4$+9Wv   '#Language "WWB-COM" ,h ' q}5   etEm#3   Option Explicit z#8d\X/   v}v! hs Q   Sub Main Q]Fm4   Sn\S`D       'Cleanup j7vp@l6`L       ClearOutputWindow() Zjz< Q-   k:Iz>3O3]       Print "Merging RPC Photonics BSDF Data Files" R(c:#KF#8       SetTextColor(255,0,0) /N`l z>^~       Print "Note: Script should be located in the same folder as the BSDF TXT files." 7[wHNJ7)r       Print "Note: Do not run this script multiple times without deleting the output file between executions." `3Gjj&c       SetTextColor(0,0,0) Gu-*@C:^&   LV'@JFT-       'Current directory of this script (should be the same as the text files being merged) ?G[<~J3-E       Dim cDir As String rRN7HL+b       cDir = MacroDir$ & "\" K; 7o+Xr   Cz2OGM*mz?       'Array which will be populated with the list of files to be merged !H`Q^Xf}       Dim fList() As String, curFile As String qsjTo@A       GetFileList( cDir, fList ) O'~c;vBI   :GU6v4u       Print "" _R!KHi       Print "Files found for merging:" v(vLk\K7       For Each curFile In fList .!ThqYo           Print Chr(9) & curFile s6(iiB%d       Next [Yx)`e   e>-a\g       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. D@V1}/$UoN       Dim nameArray() As String, sampName As String etX&o5A       nameArray = Split(fList(0)," 0-0.txt") =(f+geA"hm       sampName  = nameArray(0) HSk gS       Print "" OC|9~B1       Print "Sample name: " & Chr(9) & sampName }s_' q~R   ]&za^%q0&       'Open an output file and write the FRED header data l[EnFbD6       Dim outFile As String *t{$GBP       outFile = cDir & sampName & "_FRED.txt" /P~@__XN       Open outFile For Output As #1 =#N;ZG       Print #1, "type bsdf_data" <_HK@E<_HO       Print #1, "format angles=deg bsdf=value scale=1" \bze-|C   CKShz]1       'Loop the file list, skip the two header lines and write the remaining data to file i<N[sO       Dim lineArray() As String, curLine As Long pKf]&?FX       For Each curFile In fList m> C}T           Print "Merging data from file " & curFile 93="sS           ReadFile( cDir & curFile, lineArray ) 4J=6A4O5Z           For curLine = 2 To UBound(lineArray) PiD%PBmUl               Print #1, lineArray(curLine) 'iM;e K           Next <#U9ih 2       Next wN[mU   4Gl0h'!(       'Close the output file HS{a^c%       Close #1 bkQEfx.   b[Z5:[@\#       Print "Finished merging RPC data for sample " & sampName NZ(c>r6       Print "FRED formatted data file: " & Chr(9) & outFile L-}>;M$Y)   End Sub 2s{PE   nezdk=8J/   'Utility function to read the contents of a file into an array of strings. cd8~y   Function ReadFile(ByVal fileName As String, _ W+3ZuAP\n                     ByRef lineArray() As String) As Long H6ff b)&   K1rF;7Y6       ReadFile = -1 'JR2@W`]]       Dim oFSO As Object ^qL2Q*       Set oFSO = CreateObject("Scripting.FileSystemObject") -LF0%G       Erase lineArray Cx$M   +{V"a<D$m       Dim fid As Long @SREyqC4       If oFSO.fileexists( fileName ) Then VeixwGZ.           fid = FreeFile() 6iwIEb           Open fileName For Input As fid !xs.[&u8           lineArray = Split(Input(LOF(fid), fid), vbCrLf) HC0q_%j           Close fid ZCJOh8       End If |oq27*ix~m       Set oFSO = Nothing CmaV>       Return UBound( lineArray ) pK=$)<I"6   ?{s!.U[T@   End Function {C>.fg%t   808E)   Sub GetFileList( ByVal in_dir As String, _ @5n!t1(                    ByRef in_flist() As String ) {R[FwB^7wJ   K!/"&RjW.       'Redimension the file list array S< "M5e       Erase in_flist q\Cg2[nn2   x`@!hJc:[e       'Tracks how many files are found SFr QPdX6V       Dim fCount As Long 2}Dd{kC-       fCount = 0 G}aw{Vbg_   *vn^ W       'Recurse directory and search for text files LG6VeYe|\X       Dim f As String |zD{]y?S-       f = Dir$(in_dir & "*.txt") !w['@x.       While f <> "" %(a<(3r           ReDim Preserve in_flist(fCount) QUL^]6$           in_flist(fCount) = f ^6!C":f           fCount += 1 4`F(RweGx           f = Dir$() R<VNbm;       Wend `}:q@:%       ReDim Preserve in_flist(fCount-1)