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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 #p=+RTZ<  
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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 C,;<SV2#  
    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。 L~+aD2 E {  
    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。 GAH<  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Sy.%>$z  
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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。 q:vN3#=^qf  
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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) $hJ 4=F  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 X%!?\3S  
    例如下所示: 3 |e~YmZx  
    Sample name:  EDF-C1-56 !U5Cwq  
    Merging data from file EDF-C1-56 0-0.txt BB,-HhYT0  
    Finished merging RPC data for sample EDF-C1-56 78T;b7!-C  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt aG"  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 MAqETjB  
    a. 创建一个新的散射库 p^{yA"MQ  
    b. 散射模型命名 N<(rP1)`v  
    c. 改变散射模型为“Tabulated BSDF”. Y edF%  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 4u p7 :?  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 +CEt:KQ   
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 ?~^p:T  
    g. 点击OK %,N-M]Jf  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 KPK`C0mg@k  
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    脚本代码 (s1iYK  
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    '#Language "WWB-COM" 5U_ar   
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    Option Explicit ('_S1?y  
    _ Axw$oYS  
    Sub Main VF-[O  
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        'Cleanup bnp:J|(ld  
        ClearOutputWindow() Pw Amnk !  
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        Print "Merging RPC Photonics BSDF Data Files" [eF|2:  
        SetTextColor(255,0,0) w `M/0.)V  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." U$ZbBVa`~  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." "g!/^A!!  
        SetTextColor(0,0,0) \<=.J`o{  
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        'Current directory of this script (should be the same as the text files being merged) S@L%X<Vm  
        Dim cDir As String DqH]FS?]  
        cDir = MacroDir$ & "\" )6he;+  
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        'Array which will be populated with the list of files to be merged .fzns20u  
        Dim fList() As String, curFile As String xUs1-O1i  
        GetFileList( cDir, fList ) KC\W6|NtGj  
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        Print "" 1N8YD .3  
        Print "Files found for merging:" \cAifU  
        For Each curFile In fList ^6 ,}*@  
            Print Chr(9) & curFile JZNvuPD   
        Next >F!X'#Iv  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 7 (i\?  
        Dim nameArray() As String, sampName As String ,S3uY6,  
        nameArray = Split(fList(0)," 0-0.txt") VS<w:{*  
        sampName  = nameArray(0) -uK@2} NZ  
        Print "" 5sMyH[5zY  
        Print "Sample name: " & Chr(9) & sampName TP/bPZY  
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        'Open an output file and write the FRED header data e]d\S] 5  
        Dim outFile As String u z>V  
        outFile = cDir & sampName & "_FRED.txt" 6FI`0j=~  
        Open outFile For Output As #1 ]n|lHZR  
        Print #1, "type bsdf_data" zU>bT20x/  
        Print #1, "format angles=deg bsdf=value scale=1" EO.}{1m=hx  
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        'Loop the file list, skip the two header lines and write the remaining data to file \o!B:Vb<  
        Dim lineArray() As String, curLine As Long V_Y2@4  
        For Each curFile In fList YcuHYf5  
            Print "Merging data from file " & curFile E'_$?wWn5  
            ReadFile( cDir & curFile, lineArray ) {B\lk:"X  
            For curLine = 2 To UBound(lineArray) 9O#?r82  
                Print #1, lineArray(curLine) fL R.2vJ  
            Next ^F$iD (f  
        Next & MfnH  
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        'Close the output file 6?jSe<4x  
        Close #1 y +c 3#  
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        Print "Finished merging RPC data for sample " & sampName xXc3#n  
        Print "FRED formatted data file: " & Chr(9) & outFile "/U~j4O  
    End Sub K"ytE2:3  
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    'Utility function to read the contents of a file into an array of strings. 2Y{r2m|o  
    Function ReadFile(ByVal fileName As String, _ N u9+b"Wr  
                      ByRef lineArray() As String) As Long J|I&{  
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        ReadFile = -1 S QVyCxcX_  
        Dim oFSO As Object fxk6q$'  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ,!g%`@u  
        Erase lineArray E?P:!V=_  
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        Dim fid As Long O0#9D'{  
        If oFSO.fileexists( fileName ) Then _:,U$W  
            fid = FreeFile() HvVS<Ke  
            Open fileName For Input As fid })@LvYK  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) W_N!f=HW  
            Close fid O_wRI\ !  
        End If :>otlI<0t  
        Set oFSO = Nothing ZYX(Cf  
        Return UBound( lineArray ) `]:&h'  
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    End Function (|<.7K N  
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    Sub GetFileList( ByVal in_dir As String, _ g{06d~Y  
                     ByRef in_flist() As String ) J deGQ  
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        'Redimension the file list array c 7uryL  
        Erase in_flist F45UO%/P  
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        'Tracks how many files are found uEKa  FRm  
        Dim fCount As Long ${%*O}$  
        fCount = 0 UA}oOteG  
    F[S Ys/M  
        'Recurse directory and search for text files & ]/Z~Vt  
        Dim f As String c,I|O' &k  
        f = Dir$(in_dir & "*.txt") >Kc>=^=5  
        While f <> "" RI%ZT  
            ReDim Preserve in_flist(fCount) |YAnd=$  
            in_flist(fCount) = f SQB[d3f  
            fCount += 1 \!4sd2Yi  
            f = Dir$() e:  
        Wend Ug^v ]B9  
        ReDim Preserve in_flist(fCount-1) p$cSES>r:  
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    End Sub |F 18j9  
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