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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 ^p3W}D  
    WF<3 7"A@  
    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 P+DIo7VTX  
    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。 t$rla _rbY  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 o_03Io ~Bf  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 #@F.wV0  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 eg24.W9c  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) B lqISyrY  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 gj I>tz}  
    例如下所示: ;*0?C'h=  
    Sample name:  EDF-C1-56 } |  
    Merging data from file EDF-C1-56 0-0.txt oXU b_/  
    Finished merging RPC data for sample EDF-C1-56 U*?`tdXJ$  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 6"R'z#{OF  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 fElFyOo+  
    a. 创建一个新的散射库 YLuf2ja}X  
    b. 散射模型命名 9*r^1PRc  
    c. 改变散射模型为“Tabulated BSDF”. gU1Pb]]  
    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 ) kT:I.,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。 !;0K=~(Y^  
    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_r*<?OZ  
    g. 点击OK D"%>  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 [2E(3`-u  
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    脚本代码 QW tDZ>  
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    '#Language "WWB-COM" 2f62 0   
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    Option Explicit dFy GI?  
    \`E^>6!]q  
    Sub Main 4u+0 )<  
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        'Cleanup hCS}  
        ClearOutputWindow() qG ? :Q  
    B{*{9!(l9  
        Print "Merging RPC Photonics BSDF Data Files" *"OUwEl a  
        SetTextColor(255,0,0) !F.h+&^D;  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." !-%XrU8o3  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 2_y]MXG+%  
        SetTextColor(0,0,0) I Zw  
    hS&l4 \I'Z  
        'Current directory of this script (should be the same as the text files being merged) "%\hDL;  
        Dim cDir As String P-3f51Q  
        cDir = MacroDir$ & "\" Rc &m4|cw7  
    RB|i<`Z  
        'Array which will be populated with the list of files to be merged UtP|<]{  
        Dim fList() As String, curFile As String FSn3p}FVa  
        GetFileList( cDir, fList ) H2+b3y-1a]  
    *0to,$ n  
        Print "" E&eY79  
        Print "Files found for merging:" om2N*W.gk  
        For Each curFile In fList Y~e)3e  
            Print Chr(9) & curFile Q$v00z]f*  
        Next _TGs .t  
    /R&h#;l  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ~$J(it-a  
        Dim nameArray() As String, sampName As String 5doi4b>]!  
        nameArray = Split(fList(0)," 0-0.txt") .Z  67  
        sampName  = nameArray(0) "r* `*1  
        Print "" F"UI=7:o  
        Print "Sample name: " & Chr(9) & sampName 9@yF7  
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        'Open an output file and write the FRED header data -0x Q'1I  
        Dim outFile As String DA.k8M  
        outFile = cDir & sampName & "_FRED.txt" +{RTz)e?*  
        Open outFile For Output As #1  tH44\~  
        Print #1, "type bsdf_data" w"wW0uE^  
        Print #1, "format angles=deg bsdf=value scale=1" &9fQW?Czs  
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        'Loop the file list, skip the two header lines and write the remaining data to file [ 'lu;1-,  
        Dim lineArray() As String, curLine As Long 5af0- hj  
        For Each curFile In fList d?T!)w  
            Print "Merging data from file " & curFile xcU!bDV  
            ReadFile( cDir & curFile, lineArray ) &i(Ip'r  
            For curLine = 2 To UBound(lineArray) YrB-n  
                Print #1, lineArray(curLine) | @$I<  
            Next C5Q!_x(  
        Next )c{>@WM~  
    )Wr_*>xj  
        'Close the output file D2kmBZ3  
        Close #1 ?VmgM"'md  
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        Print "Finished merging RPC data for sample " & sampName (8)9S6  
        Print "FRED formatted data file: " & Chr(9) & outFile |w}j!}u  
    End Sub ]LUcOR  
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    'Utility function to read the contents of a file into an array of strings. XhHgXVVGG<  
    Function ReadFile(ByVal fileName As String, _ k#Sr;"  
                      ByRef lineArray() As String) As Long C| ~ A]wc=  
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        ReadFile = -1 ypx~WXFK  
        Dim oFSO As Object ,MNv}w@  
        Set oFSO = CreateObject("Scripting.FileSystemObject") zMFTkDY  
        Erase lineArray  E|"SM A,  
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        Dim fid As Long +w^,!gA&  
        If oFSO.fileexists( fileName ) Then g"1V ]  
            fid = FreeFile() G?'^"ae"Z  
            Open fileName For Input As fid 0Eb4wupo  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) A}(]J!rc  
            Close fid 6dR+qJa6i  
        End If *k62Qz3  
        Set oFSO = Nothing 2c 0;P #ol  
        Return UBound( lineArray ) B[GC@]HE  
    Q_0+N3  
    End Function Wvf>5g)?  
    ~3?-l/$  
    Sub GetFileList( ByVal in_dir As String, _ Zek@xr;]  
                     ByRef in_flist() As String ) /)sP, 2/  
    *v+l,z4n  
        'Redimension the file list array N7_eLhPt*8  
        Erase in_flist $qQYxx@  
    ES&u*X:  
        'Tracks how many files are found 1"ZtE\{ "  
        Dim fCount As Long 6+IhI?lI=  
        fCount = 0 id1cZig  
    OR+qi*)  
        'Recurse directory and search for text files TjTG+uQ  
        Dim f As String m7'<k1#"Y  
        f = Dir$(in_dir & "*.txt") i"0Bc{cQ  
        While f <> "" s Z[[ymu8  
            ReDim Preserve in_flist(fCount) ~{/M_ =  
            in_flist(fCount) = f  n?EgC8b9  
            fCount += 1 ~~OFymQ%?q  
            f = Dir$() q5SPyfE[  
        Wend  4@  
        ReDim Preserve in_flist(fCount-1) '6dVe 2V  
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    End Sub \N*([{X  
     
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