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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 Pn@DHYP  
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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 ~mK +Q%G5  
    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。 ;9ChBA  
    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。 BOy&3.h5?  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 K@Q%NK,  
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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。 n6Z!~W8  
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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) :mf&,?  
    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.?jWvcv  
    例如下所示: 4"!kCUB  
    Sample name:  EDF-C1-56 IQ-l%x[fue  
    Merging data from file EDF-C1-56 0-0.txt )z4eRs F|  
    Finished merging RPC data for sample EDF-C1-56 w5/6+@}  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt >@4AxV\  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 cF9oo%3  
    a. 创建一个新的散射库 lHTr7uF(  
    b. 散射模型命名 }ALli0n`V)  
    c. 改变散射模型为“Tabulated BSDF”. FDGG$z?>m  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) BTG_c_ ?]e  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 m9&%A0  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 0E (G1o'  
    g. 点击OK YH^@8   
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 X*5N&AJ  
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    脚本代码  +`ov1h  
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    '#Language "WWB-COM" /nX_Q?mo  
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    Option Explicit ~.0'v [N  
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    Sub Main )vVf- zU  
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        'Cleanup h5-yhG  
        ClearOutputWindow() h9iQn<lp4.  
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        Print "Merging RPC Photonics BSDF Data Files" m!P<# |V  
        SetTextColor(255,0,0) U^U hZ!  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 8.I3%u  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." :h3n[%  
        SetTextColor(0,0,0) hk S:_e=  
    UA ]fKi  
        'Current directory of this script (should be the same as the text files being merged) C=cn .CX  
        Dim cDir As String <63TN`B  
        cDir = MacroDir$ & "\" )/~o'M3  
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        'Array which will be populated with the list of files to be merged ue'dI   
        Dim fList() As String, curFile As String :$PrlE  
        GetFileList( cDir, fList ) -"H0Qafm  
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        Print "" eQn[  
        Print "Files found for merging:" KU+\fwYpnk  
        For Each curFile In fList Z 5)v  
            Print Chr(9) & curFile &}pF6eIar  
        Next Km,o+9?1gF  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. "Ehh9 m1&  
        Dim nameArray() As String, sampName As String ?d{O' &|:  
        nameArray = Split(fList(0)," 0-0.txt") nLv~)IQ}:  
        sampName  = nameArray(0) u=vBjaN2_w  
        Print "" #e,TS`"eD  
        Print "Sample name: " & Chr(9) & sampName (~E-=+R[$&  
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        'Open an output file and write the FRED header data w9O!L9 6  
        Dim outFile As String U[8F{LX  
        outFile = cDir & sampName & "_FRED.txt" 8c_X`0jy  
        Open outFile For Output As #1 3G2iRr.o  
        Print #1, "type bsdf_data" ^Qn:#O9  
        Print #1, "format angles=deg bsdf=value scale=1" r3-<~k-  
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        'Loop the file list, skip the two header lines and write the remaining data to file J]{<Z?%  
        Dim lineArray() As String, curLine As Long 4 m"0R\  
        For Each curFile In fList .cw)Y#;IG  
            Print "Merging data from file " & curFile 1,Mm+_)B  
            ReadFile( cDir & curFile, lineArray ) 2k^rZ^^"  
            For curLine = 2 To UBound(lineArray) iF837ng5  
                Print #1, lineArray(curLine) M+HhTW;I=  
            Next >D}|'.&  
        Next ]*lZFP~  
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        'Close the output file dC-~=}HR^  
        Close #1 4dLnX3 v  
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        Print "Finished merging RPC data for sample " & sampName ]FIIs58IM  
        Print "FRED formatted data file: " & Chr(9) & outFile K9p<PLy+  
    End Sub NqNU:_}  
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    'Utility function to read the contents of a file into an array of strings. BnGoB`n  
    Function ReadFile(ByVal fileName As String, _ '<uM\v^k  
                      ByRef lineArray() As String) As Long Gau@RX:O  
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        ReadFile = -1 %Q &']  
        Dim oFSO As Object nLG)>L  
        Set oFSO = CreateObject("Scripting.FileSystemObject") {#4a}:3  
        Erase lineArray m{X{h4t  
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        Dim fid As Long y%61xA`#  
        If oFSO.fileexists( fileName ) Then d,(q 3  
            fid = FreeFile() {f)aFGp  
            Open fileName For Input As fid dh [kx  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) n8_X<jIp3  
            Close fid C/qKa[mg  
        End If &ZkJ,-  
        Set oFSO = Nothing [MwL=9;!H  
        Return UBound( lineArray ) a=A12<  
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    End Function .KC V|x;QW  
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    Sub GetFileList( ByVal in_dir As String, _ L8f+uI   
                     ByRef in_flist() As String ) p5vQ.Ni*\-  
    #0uu19+}  
        'Redimension the file list array X1a~l|$h  
        Erase in_flist &oB*gGRw=7  
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        'Tracks how many files are found ?QJx!'Y,p  
        Dim fCount As Long kc P ZIP:  
        fCount = 0 rg k1.0U0  
    Sk!' 2y*@&  
        'Recurse directory and search for text files ht]n*  
        Dim f As String L/-SWid)  
        f = Dir$(in_dir & "*.txt") @<pd@Mpf]  
        While f <> "" ~/-SKGzo-  
            ReDim Preserve in_flist(fCount) r0lI&25w  
            in_flist(fCount) = f SM RKEPwp&  
            fCount += 1 Y,Z$U| U  
            f = Dir$() wzd(= *N  
        Wend 0|tyKP|J  
        ReDim Preserve in_flist(fCount-1) 2\k!DF  
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    End Sub ]w;t0Bk  
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