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    [技术]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: 2023-05-11
    摘要 T1bFxim#b  
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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 &<@%{h@=  
    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。 9j2\y=<&  
    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。 (qbc;gBy  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 [*t U}9  
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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。 \wFhTJY  
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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) =:;YTie  
    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 T*8_FR<  
    例如下所示: "s${!A)  
    Sample name:  EDF-C1-56 M",];h(I6(  
    Merging data from file EDF-C1-56 0-0.txt v23TL  
    Finished merging RPC data for sample EDF-C1-56 dw3'T4TC?  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt "`[$&:~  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 -h=c=P  
    a. 创建一个新的散射库 jXtLo,km  
    b. 散射模型命名 (%.</|u  
    c. 改变散射模型为“Tabulated BSDF”. ti+pUlVrM  
    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 ) vmMV 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。 ')rD?Z9 ^  
    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 x)d2G 6x  
    g. 点击OK XQ4dohGCP  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 3JTU^-S<  
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    脚本代码 FDl,Ey^r/  
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    '#Language "WWB-COM" :C> J-zY  
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    Option Explicit O.dux5lfBd  
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    Sub Main ,b.kw}k  
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        'Cleanup X E!2Q7Q9  
        ClearOutputWindow() t;oT {Hge  
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        Print "Merging RPC Photonics BSDF Data Files" >\RDQ%z  
        SetTextColor(255,0,0) J6= w:c  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." t CkoYrvT  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." DS.39NY  
        SetTextColor(0,0,0) ,.J<.#D3J  
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        'Current directory of this script (should be the same as the text files being merged) )`e^F9L  
        Dim cDir As String 3x,Aczb  
        cDir = MacroDir$ & "\" |dW2dQ  
    O7! fI'R  
        'Array which will be populated with the list of files to be merged 2LtU;}7s  
        Dim fList() As String, curFile As String 0c%@e2(N  
        GetFileList( cDir, fList ) C#ZmgR  
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        Print "" jq7vOr-_g  
        Print "Files found for merging:" W dei`u[  
        For Each curFile In fList _-g-'Hr+N  
            Print Chr(9) & curFile .ruqRGe/  
        Next rE!G,^_{  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. mjWp8i  
        Dim nameArray() As String, sampName As String !E4E'I=]N  
        nameArray = Split(fList(0)," 0-0.txt") G~Sy&XJuq  
        sampName  = nameArray(0) &C CHxjsKR  
        Print "" v=dKcruR:  
        Print "Sample name: " & Chr(9) & sampName i528e{&  
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        'Open an output file and write the FRED header data Z5"!0B^ j  
        Dim outFile As String 5d)'`hACe  
        outFile = cDir & sampName & "_FRED.txt" 0+$hkd n  
        Open outFile For Output As #1 ~e,f)?  
        Print #1, "type bsdf_data" PR48~K,?  
        Print #1, "format angles=deg bsdf=value scale=1" #fJ/KYJU  
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        'Loop the file list, skip the two header lines and write the remaining data to file H>gWxJ 5  
        Dim lineArray() As String, curLine As Long <=B1"'\  
        For Each curFile In fList o06A=4I  
            Print "Merging data from file " & curFile GapX$Jb,p  
            ReadFile( cDir & curFile, lineArray ) >cvE_g"?C  
            For curLine = 2 To UBound(lineArray) I{i:B  
                Print #1, lineArray(curLine) gOBj0P8s|}  
            Next M6@'9E]|>  
        Next <k!mdj)  
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        'Close the output file &>+I7Ts]  
        Close #1 UKt/0Ze  
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        Print "Finished merging RPC data for sample " & sampName EF*oPn0|  
        Print "FRED formatted data file: " & Chr(9) & outFile B^Rw?: hN  
    End Sub ,qBnqi[  
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    'Utility function to read the contents of a file into an array of strings. < -@,  
    Function ReadFile(ByVal fileName As String, _ LaEX kb*s  
                      ByRef lineArray() As String) As Long XL"v21X  
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        ReadFile = -1 J pCZq #  
        Dim oFSO As Object Z L6~Eut  
        Set oFSO = CreateObject("Scripting.FileSystemObject") pqGf@24c<  
        Erase lineArray pw(U< )  
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        Dim fid As Long #XYLVee,  
        If oFSO.fileexists( fileName ) Then 2V=FWuXC"  
            fid = FreeFile() q;Ar&VrlNq  
            Open fileName For Input As fid (e bBH  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) g0; &/;"  
            Close fid .:r2BgL  
        End If 0NuL9  
        Set oFSO = Nothing ]HZa:aPY  
        Return UBound( lineArray ) F$sF 'cw  
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    End Function >M8^ Jgh  
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    Sub GetFileList( ByVal in_dir As String, _ `o^;fcnG  
                     ByRef in_flist() As String ) +r#=n7 t  
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        'Redimension the file list array mPw56>  
        Erase in_flist FS]+s>  
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        'Tracks how many files are found c9cphZ(z  
        Dim fCount As Long 5,=B1  
        fCount = 0 ^8f|clw"  
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        'Recurse directory and search for text files nIN%<3U2  
        Dim f As String `|ck5DZT5L  
        f = Dir$(in_dir & "*.txt") QB.*R?A  
        While f <> "" e{rHO,#A>  
            ReDim Preserve in_flist(fCount) J*6n6  
            in_flist(fCount) = f )W}/k$S  
            fCount += 1 wr;|\<c  
            f = Dir$() k1LtqV  
        Wend J}Z_.:JO(w  
        ReDim Preserve in_flist(fCount-1) 6{Cu~G{]N  
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    End Sub YCLD!S/?  
     
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