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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 D"ehWLj  
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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 GS Q/NYK  
    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。 gzD@cx?V  
    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。 V{&rQ@{W  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 R$Tp8G>j  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 Iu *^xn  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) gxMfu?zk"  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 d k<XzO~g  
    例如下所示: t/PlcV_M"  
    Sample name:  EDF-C1-56 \VFHHi:I  
    Merging data from file EDF-C1-56 0-0.txt i^!ez5z  
    Finished merging RPC data for sample EDF-C1-56 V$rlA' +1v  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt V@QK  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 iTg;7~1pY  
    a. 创建一个新的散射库 ~E^,=4  
    b. 散射模型命名 {Pu\?Cq  
    c. 改变散射模型为“Tabulated BSDF”. T'aec]u  
    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 ) k') E/n  
    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。 2',w[I  
    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 FsGlJ   
    g. 点击OK EmT`YNuc  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 wB{;bB{  
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    脚本代码 R1W}dRE}  
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    '#Language "WWB-COM" @AYo-gf  
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    Option Explicit ^Mk%z9 ?  
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    Sub Main =60~UM  
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        'Cleanup A[YpcG'9  
        ClearOutputWindow() ACK1@eF  
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        Print "Merging RPC Photonics BSDF Data Files" 45H!;Q sk  
        SetTextColor(255,0,0) irZFV  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Px>va01n  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." pBC<u  
        SetTextColor(0,0,0) h`}3h< 8  
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        'Current directory of this script (should be the same as the text files being merged) 2w$t wW-  
        Dim cDir As String U`x bPQ  
        cDir = MacroDir$ & "\" {3Vk p5%l  
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        'Array which will be populated with the list of files to be merged X{-9FDW  
        Dim fList() As String, curFile As String T^}  
        GetFileList( cDir, fList ) D8# on!  
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        Print "" N|2y"5  
        Print "Files found for merging:" 2`= 6%s  
        For Each curFile In fList j,2l8?  
            Print Chr(9) & curFile '?yCq$&  
        Next H2-28XGc  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 41 vL"P K  
        Dim nameArray() As String, sampName As String ehAu^^Q>  
        nameArray = Split(fList(0)," 0-0.txt") H_IGFZCh  
        sampName  = nameArray(0) s Fgadz6O  
        Print "" L{ymI) Y^  
        Print "Sample name: " & Chr(9) & sampName efuK  
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        'Open an output file and write the FRED header data 5H:@ 8,B  
        Dim outFile As String n|4;Hn1V  
        outFile = cDir & sampName & "_FRED.txt" p&K\]l}  
        Open outFile For Output As #1 L6i|:D32p  
        Print #1, "type bsdf_data"  [&P`ak  
        Print #1, "format angles=deg bsdf=value scale=1" >LF&EM]  
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        'Loop the file list, skip the two header lines and write the remaining data to file 4rU! 4l  
        Dim lineArray() As String, curLine As Long kYxS~Kd<  
        For Each curFile In fList O:.,+,BH  
            Print "Merging data from file " & curFile WO,xMfK  
            ReadFile( cDir & curFile, lineArray ) y02 u?wJ  
            For curLine = 2 To UBound(lineArray) ! ]Mc4!E  
                Print #1, lineArray(curLine) swpnuuC-  
            Next >AI<60/<  
        Next xnq><4  
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        'Close the output file `HX3|w6W;  
        Close #1 Vul+]h[!h  
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        Print "Finished merging RPC data for sample " & sampName [B?z1z8l  
        Print "FRED formatted data file: " & Chr(9) & outFile i!MwBYk  
    End Sub P?3{z="LzJ  
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    'Utility function to read the contents of a file into an array of strings. y>(rZ^y&  
    Function ReadFile(ByVal fileName As String, _ uf@U:V  
                      ByRef lineArray() As String) As Long =V^@%YIn  
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        ReadFile = -1 f(u&XuZ  
        Dim oFSO As Object En9R>A;`  
        Set oFSO = CreateObject("Scripting.FileSystemObject") amB@N6*  
        Erase lineArray }BN\/;<A  
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        Dim fid As Long {&nV4c$v  
        If oFSO.fileexists( fileName ) Then < `Z%O<X  
            fid = FreeFile() te2 Iu%5 z  
            Open fileName For Input As fid ~/`X*n&  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 4-:7.I(hq  
            Close fid C;sgK  
        End If =wA5P@  
        Set oFSO = Nothing B2hfD-h,>  
        Return UBound( lineArray ) T#iU+)-\%  
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    End Function b4~H3|  
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    Sub GetFileList( ByVal in_dir As String, _ p~bkf>  
                     ByRef in_flist() As String ) i;lE5  
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        'Redimension the file list array $au2%NL  
        Erase in_flist X N;/nU  
    NdQ%:OKC  
        'Tracks how many files are found kQ}s/*  
        Dim fCount As Long [(c L/_  
        fCount = 0 iUNnPJh  
    5L &:_iQZy  
        'Recurse directory and search for text files M j~${vj  
        Dim f As String [$2qna2VP  
        f = Dir$(in_dir & "*.txt") SLA#= K  
        While f <> "" `$9L^Yg,4  
            ReDim Preserve in_flist(fCount) HtzMDGV<  
            in_flist(fCount) = f #K`B<2+T  
            fCount += 1 !Y%D 9  
            f = Dir$() zPQ$\$7xB  
        Wend A1<k1[5fJ  
        ReDim Preserve in_flist(fCount-1) h[l{ 5Z*  
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    End Sub R]=SWE}U  
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