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    [分享]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 S4(IYnwN  
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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。
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    背景 \vT8 )\  
    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。 3dM6zOK  
    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。 H}$#aXEAn  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 F0!r9U((  
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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。 !kIw835U  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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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) f>'7~69  
    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 -@73"w/  
    例如下所示: Rsulp#['  
    Sample name:  EDF-C1-56 tb i;X=5  
    Merging data from file EDF-C1-56 0-0.txt V|D;7  
    Finished merging RPC data for sample EDF-C1-56 y jpjJ  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt f"tO*/|`  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 vIREvj#U  
    a. 创建一个新的散射库 4a 5n*6G!  
    b. 散射模型命名 Kzm_AHA)  
    c. 改变散射模型为“Tabulated BSDF”. f^]AyU;F:  
    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 ) \?g%>D:O;  
    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。 %MIu;u FR  
    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 I)x:NF6JO  
    g. 点击OK ^U =`Rx  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 \xdt|:8  
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    脚本代码 i~.[iZf|  
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    '#Language "WWB-COM" 6M6QMg^  
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    Option Explicit *Z]| Z4Q/`  
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    Sub Main JTI m`t"d=  
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        'Cleanup D;L :a`Y  
        ClearOutputWindow() B -KOf  
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        Print "Merging RPC Photonics BSDF Data Files" e\dT~)c  
        SetTextColor(255,0,0) \(C W?9)  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." d5%*^nMpY  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." MT5A%|He  
        SetTextColor(0,0,0) gv,T<A?Z2  
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        'Current directory of this script (should be the same as the text files being merged) C0W~Tk\C2  
        Dim cDir As String SQ!lgm1bA  
        cDir = MacroDir$ & "\" A)#sh) }Q  
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        'Array which will be populated with the list of files to be merged +wSm6*j7=  
        Dim fList() As String, curFile As String VB#31T#q?  
        GetFileList( cDir, fList ) vP4Ij  
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        Print "" ^ZlV1G;/W@  
        Print "Files found for merging:" g#:XN  
        For Each curFile In fList v;Dcq  
            Print Chr(9) & curFile zJ:r0Bt  
        Next 85fDuJ9$Z"  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ]Yu+M3Fq  
        Dim nameArray() As String, sampName As String Tc(R-Wi  
        nameArray = Split(fList(0)," 0-0.txt") vw]nqS~N  
        sampName  = nameArray(0) D5>~'N3b  
        Print "" <f6PULm  
        Print "Sample name: " & Chr(9) & sampName tb{{oxa,k  
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        'Open an output file and write the FRED header data FNM"!z  
        Dim outFile As String >l1Yhxd_0*  
        outFile = cDir & sampName & "_FRED.txt" hn|E<  
        Open outFile For Output As #1 T/;hIX:R  
        Print #1, "type bsdf_data" \.a .'l  
        Print #1, "format angles=deg bsdf=value scale=1" nc~d*K\!  
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        'Loop the file list, skip the two header lines and write the remaining data to file Zsogx}i-  
        Dim lineArray() As String, curLine As Long B|=maz:_  
        For Each curFile In fList 5r<(Z0  
            Print "Merging data from file " & curFile +I n"OR%  
            ReadFile( cDir & curFile, lineArray ) 2S6EDXc  
            For curLine = 2 To UBound(lineArray) :\J bWj_j  
                Print #1, lineArray(curLine) RG3G},Q   
            Next t"p#ii a  
        Next wKlCx  
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        'Close the output file h3EDN:FQ  
        Close #1 --YUiNhh  
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        Print "Finished merging RPC data for sample " & sampName Iq]6]  
        Print "FRED formatted data file: " & Chr(9) & outFile ~ p.W*skD  
    End Sub "T%'Rp`j|  
    -!>ZATL<B  
    'Utility function to read the contents of a file into an array of strings. 4_I{Q^f  
    Function ReadFile(ByVal fileName As String, _ TY\"@(Q|G  
                      ByRef lineArray() As String) As Long DB%AO:8  
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        ReadFile = -1 TQd FC\@f"  
        Dim oFSO As Object &] F|U3  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 7B\(r~f`t  
        Erase lineArray F` 5/9?;|  
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        Dim fid As Long -xu.=n@,  
        If oFSO.fileexists( fileName ) Then @n X2*j*u  
            fid = FreeFile() <lmJa#  
            Open fileName For Input As fid niEEm`"  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) tW:/R@@  
            Close fid \ e8*vos  
        End If 6q[!X0u  
        Set oFSO = Nothing #K1BJ#KUt  
        Return UBound( lineArray ) Y0yO `W4  
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    End Function e_k _ ty`  
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    Sub GetFileList( ByVal in_dir As String, _ ObyuhAR  
                     ByRef in_flist() As String ) XVDd1#h  
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        'Redimension the file list array #!Cter2  
        Erase in_flist x~9z`d{!  
    T[XP\!z]B!  
        'Tracks how many files are found 9g &Ch9-/  
        Dim fCount As Long oUvk2]H  
        fCount = 0 T E&Q6  
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        'Recurse directory and search for text files RD$tc~@UB  
        Dim f As String EdAR<VfleA  
        f = Dir$(in_dir & "*.txt") PWk ?8dL-  
        While f <> "" q_]   
            ReDim Preserve in_flist(fCount) n*m"L|:ff  
            in_flist(fCount) = f f;Bfh3  
            fCount += 1 n;kciTD%wK  
            f = Dir$() W-!Bl&jF[  
        Wend ,M@m4bx  
        ReDim Preserve in_flist(fCount-1) (}FW])y  
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    End Sub #x5N{8  
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