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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 正序阅读 楼主  发表于: 2023-05-11
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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 rFn;z}J2  
    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。 9 YU7R)  
    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。 Sy'/%[+goJ  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 _d]w)YMO  
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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。 Y+V*$73`  
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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) 7J,W#Ql)5  
    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 $ZXy&?4  
    例如下所示: V@8 4Cb  
    Sample name:  EDF-C1-56 CjOaw$s  
    Merging data from file EDF-C1-56 0-0.txt #2I[F  
    Finished merging RPC data for sample EDF-C1-56 WMZa6cH  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ()(@Qcc  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 |I7P 0JqP  
    a. 创建一个新的散射库 "(/|[7D)  
    b. 散射模型命名 Q9 kKk  
    c. 改变散射模型为“Tabulated BSDF”. -t?S:9 [w  
    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 ) Nt&}T  
    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。 . %tc7`k8  
    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 PFG):i-?  
    g. 点击OK 5cxA,T  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 u$&7fmZ  
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    脚本代码 =@binTC4  
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    '#Language "WWB-COM" /zuU  
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    Option Explicit Q2^}NQO=  
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    Sub Main A]BG*  
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        'Cleanup 2[9hl@=%  
        ClearOutputWindow() ?O\n!c  
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        Print "Merging RPC Photonics BSDF Data Files" y$*Tbzp  
        SetTextColor(255,0,0) z.]t_`KuF9  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ?_m;~>C  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." z mrk`o~  
        SetTextColor(0,0,0) C n\'sb{  
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        'Current directory of this script (should be the same as the text files being merged) A:p7\Kp;5}  
        Dim cDir As String sTeL4g|%{  
        cDir = MacroDir$ & "\" u~1[nH:  
    }/(fe`7:  
        'Array which will be populated with the list of files to be merged kd|@.  
        Dim fList() As String, curFile As String )f(#Fn  
        GetFileList( cDir, fList ) vj[ .`fY  
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        Print "" ~e~4S~{  
        Print "Files found for merging:" _ 97F  
        For Each curFile In fList zJ3{!E}`v  
            Print Chr(9) & curFile /ta-jOcRH&  
        Next jf*M}Q1jHE  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. -g;iMqh#  
        Dim nameArray() As String, sampName As String U,[vfSDGr  
        nameArray = Split(fList(0)," 0-0.txt") :~ zK0v"  
        sampName  = nameArray(0) ,U],Wu)  
        Print "" , YTuZS  
        Print "Sample name: " & Chr(9) & sampName u{ JAC!  
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        'Open an output file and write the FRED header data Z7K ;~*  
        Dim outFile As String Ga.a"\F.V  
        outFile = cDir & sampName & "_FRED.txt" N=zrY`Vd  
        Open outFile For Output As #1 _;v4 ]MU  
        Print #1, "type bsdf_data" MHI0>QsI  
        Print #1, "format angles=deg bsdf=value scale=1" yGZb  
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        'Loop the file list, skip the two header lines and write the remaining data to file iKLN !QR  
        Dim lineArray() As String, curLine As Long :f 1*-y  
        For Each curFile In fList tP"C >#LO  
            Print "Merging data from file " & curFile rVt6tx  
            ReadFile( cDir & curFile, lineArray ) ,K+K`"Oy  
            For curLine = 2 To UBound(lineArray) B3c rms['  
                Print #1, lineArray(curLine) c:>&Bg&,6T  
            Next 8"N<g'Yl,  
        Next ,kpk XK  
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        'Close the output file >y(;k|-$  
        Close #1 flVQG@  
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        Print "Finished merging RPC data for sample " & sampName !-U5d9!  
        Print "FRED formatted data file: " & Chr(9) & outFile owmV7E1  
    End Sub ;} Ty b  
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    'Utility function to read the contents of a file into an array of strings. 52C>f6w  
    Function ReadFile(ByVal fileName As String, _ ;&s`g   
                      ByRef lineArray() As String) As Long r_@;eh  
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        ReadFile = -1 )ra_`Qdcf  
        Dim oFSO As Object ">v76%>Z7  
        Set oFSO = CreateObject("Scripting.FileSystemObject") \WQ\q \  
        Erase lineArray [ZZ~^U5  
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        Dim fid As Long ?y>P  
        If oFSO.fileexists( fileName ) Then 4sP0oe[h  
            fid = FreeFile() Uk` ym  
            Open fileName For Input As fid ;;2XLkWu  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ]p\7s  
            Close fid z{]$WVs:^  
        End If b" 1a7   
        Set oFSO = Nothing (]w_}E]N  
        Return UBound( lineArray ) iyB02\d  
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    End Function po4seW!  
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    Sub GetFileList( ByVal in_dir As String, _ r? nvJHP  
                     ByRef in_flist() As String ) |cEJRs@B  
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        'Redimension the file list array a:r8Jzr  
        Erase in_flist 3=RVJb  
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        'Tracks how many files are found P(l$5x]g,  
        Dim fCount As Long {pH{SRM)B  
        fCount = 0 oM G8?p  
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        'Recurse directory and search for text files k@L},Td  
        Dim f As String |]1-ck!  
        f = Dir$(in_dir & "*.txt") I<`K;El'  
        While f <> "" %PRG;kR  
            ReDim Preserve in_flist(fCount) P"Lk(gY  
            in_flist(fCount) = f A'vQtlvKA  
            fCount += 1 J3fk3d`2  
            f = Dir$() {;4Y5kj  
        Wend Jr$,w7tQn@  
        ReDim Preserve in_flist(fCount-1) cXU8}>qY7  
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    End Sub GvSSi'q~B  
     
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