[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： 3C[#_&_l  
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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。 4gR;,%E\TO  
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背景： *A<vrkHz  
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。 <'y}y}%  
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。
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步骤 -BV8,1  
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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。 T`ofj7$:  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） a:v5(@8  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 2
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例如下所示： ;?h+8Z/{  
Sample name:  EDF-C1-56 /Z~}dWI  
Merging data from file EDF-C1-56 0-0.txt +,g3Xqs}X  
Finished merging RPC data for sample EDF-C1-56 Lg%3M8-W~  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt PTS dW~3  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 -v@LJCK7I  
a. 创建一个新的散射库 s(.H"_a  
b. 散射模型命名 DXI{ jalL  
c. 改变散射模型为“Tabulated BSDF”. " ""k}M2A  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） c1Rn1M,2k  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 i)!2DXn  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， qr@<'wp/  
g. 点击OK Be$v%4  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值  `1`Qu!  
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脚本代码： GQH15_  
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'#Language "WWB-COM" 7 /6Zp?  
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Option Explicit :pH
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Sub Main
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    'Cleanup H`bS::JI-  
    ClearOutputWindow() g)mjw  
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    Print "Merging RPC Photonics BSDF Data Files" +HT?>k  
    SetTextColor(255,0,0) p![UOI"W  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." (Q?@LzCjy  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." Fks #Y1rI  
    SetTextColor(0,0,0) Y*QoD9<T?;  
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    'Current directory of this script (should be the same as the text files being merged) @|PUet_pb  
    Dim cDir As String 64UrD{$o  
    cDir = MacroDir$ & "\" /(u# D[  
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    'Array which will be populated with the list of files to be merged QOR92}yC  
    Dim fList() As String, curFile As String (f
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    GetFileList( cDir, fList ) XiMd|D  
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    Print "" \0veld  
    Print "Files found for merging:" QJy1j~9x  
    For Each curFile In fList Al1}Ir  
        Print Chr(9) & curFile 3}}8ukq  
    Next k`((6  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. $@HW|Y  
    Dim nameArray() As String, sampName As String 7n)ob![\d  
    nameArray = Split(fList(0)," 0-0.txt") nX_w F`n"  
    sampName  = nameArray(0) zRMz8IC.  
    Print "" TD sjNFe3  
    Print "Sample name: " & Chr(9) & sampName K!,9qH  
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    'Open an output file and write the FRED header data `t"7[Zk  
    Dim outFile As String j#jwK(:]  
    outFile = cDir & sampName & "_FRED.txt" ,MjlA{0  
    Open outFile For Output As #1 %i) 0sET  
    Print #1, "type bsdf_data" ;4QE.&s`  
    Print #1, "format angles=deg bsdf=value scale=1" 0|DyYu  
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    'Loop the file list, skip the two header lines and write the remaining data to file dsn(h5,Q'  
    Dim lineArray() As String, curLine As Long H0f]Swh0a  
    For Each curFile In fList . {vMn0c  
        Print "Merging data from file " & curFile ?PYZW5  
        ReadFile( cDir & curFile, lineArray ) mX%T"_^  
        For curLine = 2 To UBound(lineArray) TQtH
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            Print #1, lineArray(curLine) Iqci}G%r  
        Next ^WrL   
    Next AqAL)`#K  
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    'Close the output file p}Um+I=1  
    Close #1 j 8)*'T  
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    Print "Finished merging RPC data for sample " & sampName Q@uWh:  
    Print "FRED formatted data file: " & Chr(9) & outFile R=3|(R+kA  
End Sub ~d3|zlh  
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'Utility function to read the contents of a file into an array of strings. q|}O-A*wa  
Function ReadFile(ByVal fileName As String, _ z(u,$vZ_  
                  ByRef lineArray() As String) As Long qu\U^F  
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    ReadFile = -1 r PTfwhs  
    Dim oFSO As Object Ng2Z7k  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ?[|A sw1t  
    Erase lineArray H.;2o(vD  
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    Dim fid As Long /BN=Kl]  
    If oFSO.fileexists( fileName ) Then Y4+]5;B8  
        fid = FreeFile() 2tg07  
        Open fileName For Input As fid 1#*^+A E  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf)
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        Close fid C[';B)a  
    End If 9{}"tk5$h  
    Set oFSO = Nothing K^",LCJA  
    Return UBound( lineArray ) 1\%@oD_zG  
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End Function E5#ff5  
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Sub GetFileList( ByVal in_dir As String, _ Z^BZH/I?  
                 ByRef in_flist() As String ) P'o]#Az  
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    'Redimension the file list array -Mf-8zw8G  
    Erase in_flist =4sx(<  
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    'Tracks how many files are found 3<l}gB'S[  
    Dim fCount As Long |N}*  
    fCount = 0 6b%IPbb  
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    'Recurse directory and search for text files (J?_~(,`"  
    Dim f As String &'`ki0Xh;  
    f = Dir$(in_dir & "*.txt") g<ov` bF  
    While f <> "" z7z9lDS  
        ReDim Preserve in_flist(fCount) 5i}g$yjZ<  
        in_flist(fCount) = f #?`S+YN!q)  
        fCount += 1 u9(42jj[$U  
        f = Dir$() *7=`]w5k1  
    Wend b@Dt]6_UL  
    ReDim Preserve in_flist(fCount-1) XwfR/4  
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End Sub NcHU)  
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