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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
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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 n5QO'Jr%[  
    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。 $1])>m_ct  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 H1-DK+Q:  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 !td!">r46e  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 %B@NW2ZQ[  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) T, #-: }  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 u(Mbp$R' ?  
    例如下所示: 0/ QDfA?  
    Sample name:  EDF-C1-56 a?-Jj\q  
    Merging data from file EDF-C1-56 0-0.txt ,3?=W/Um4  
    Finished merging RPC data for sample EDF-C1-56 sPK]:i C  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt DGJ:#U E  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 XoyxS:=>|[  
    a. 创建一个新的散射库 O<vBuD2  
    b. 散射模型命名 0L>3 i8'  
    c. 改变散射模型为“Tabulated BSDF”. EeYL~ORdi  
    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 ) _h1bVd-  
    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。 `v?hL~  
    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 !/}4_s`,  
    g. 点击OK x)?V{YAL  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 e,s  S.  
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    脚本代码 Jz''UJY/O  
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    '#Language "WWB-COM" +vZYuEq_  
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    Option Explicit IEm?'o:  
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    Sub Main Y's=31G@  
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        'Cleanup }zA|M9%E  
        ClearOutputWindow() Yh]a4l0  
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        Print "Merging RPC Photonics BSDF Data Files" "0!#De  
        SetTextColor(255,0,0) MO ~T_6  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ky !Z JR  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." I 6WHC*  
        SetTextColor(0,0,0) M0m%S:2  
    %#% YU|4R  
        'Current directory of this script (should be the same as the text files being merged) >XZ2w_  
        Dim cDir As String _U*R_2aV  
        cDir = MacroDir$ & "\" _ (b4|hJ'  
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        'Array which will be populated with the list of files to be merged j&DlI_  
        Dim fList() As String, curFile As String ~/4j&IG  
        GetFileList( cDir, fList ) , JH*l:7  
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        Print "" ~H''RzN  
        Print "Files found for merging:" z .lb(xQ  
        For Each curFile In fList AYNz {9  
            Print Chr(9) & curFile `LFT"qnp  
        Next ]UO zz1   
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. |vi=h2*  
        Dim nameArray() As String, sampName As String heF'7ezv#  
        nameArray = Split(fList(0)," 0-0.txt") '\H & EJ'  
        sampName  = nameArray(0) hpOY&7QUTD  
        Print "" i_L u  
        Print "Sample name: " & Chr(9) & sampName x^3K=l;N  
    ;Qd'G7+  
        'Open an output file and write the FRED header data 0Wd5s{S  
        Dim outFile As String v-$X1s  
        outFile = cDir & sampName & "_FRED.txt" j.Y!E<e4]  
        Open outFile For Output As #1 >Dv=lgPF  
        Print #1, "type bsdf_data" 7<jr0)  
        Print #1, "format angles=deg bsdf=value scale=1" \U]<HEc^  
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        'Loop the file list, skip the two header lines and write the remaining data to file 7TX$  
        Dim lineArray() As String, curLine As Long un6W|{4]  
        For Each curFile In fList  K0*er  
            Print "Merging data from file " & curFile -b%' K}.C  
            ReadFile( cDir & curFile, lineArray ) U&kdR+dB  
            For curLine = 2 To UBound(lineArray) *[nS*D\:  
                Print #1, lineArray(curLine) cL %eP.  
            Next -}qay@cDt  
        Next  mznE Cy  
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        'Close the output file /\jRr7 Cd  
        Close #1 \XY2s&"  
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        Print "Finished merging RPC data for sample " & sampName Z _<Wr7D  
        Print "FRED formatted data file: " & Chr(9) & outFile H_JT"~_2  
    End Sub j~2t^Qz  
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    'Utility function to read the contents of a file into an array of strings. =Oh/4TbW[  
    Function ReadFile(ByVal fileName As String, _ KG5B6Om5'  
                      ByRef lineArray() As String) As Long YcaLc_pUx  
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        ReadFile = -1 !Je!;mEvI  
        Dim oFSO As Object kD+B8TrW  
        Set oFSO = CreateObject("Scripting.FileSystemObject") NLWj5K)1P  
        Erase lineArray h 7\EN  
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        Dim fid As Long ]=^NTm,  
        If oFSO.fileexists( fileName ) Then )N ^g0 L  
            fid = FreeFile() AQBr{^inH|  
            Open fileName For Input As fid <CP't[  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) cRPy5['E  
            Close fid l&Fx< W  
        End If `4]-B@ 7_  
        Set oFSO = Nothing ;S>ml   
        Return UBound( lineArray ) QEL3b4Vm  
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    End Function 0Ioa;XgOn  
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    Sub GetFileList( ByVal in_dir As String, _ S1$&  
                     ByRef in_flist() As String ) :'dH)yO  
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        'Redimension the file list array k3"Y!Uha:  
        Erase in_flist 9%uJ:c?  
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        'Tracks how many files are found 0j~C6 vp  
        Dim fCount As Long wvSaq+N  
        fCount = 0 s2+s1%^Ll  
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        'Recurse directory and search for text files XAr YmO  
        Dim f As String 0jwex  
        f = Dir$(in_dir & "*.txt") w0t||qj^>"  
        While f <> "" ~|)'vK8W  
            ReDim Preserve in_flist(fCount) +l$BUX  
            in_flist(fCount) = f ,}#l0 BY  
            fCount += 1 B1gBvss  
            f = Dir$() Zz04Pz1  
        Wend aq,?  
        ReDim Preserve in_flist(fCount-1) )![? JXf  
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    End Sub '.DFyHsq  
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