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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 %%g-GyP 1  
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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 M#0 @X  
    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。 J_  V,XO  
    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。 ^g!B.ll`  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ~Fx&)kegTo  
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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。 YsAF{  
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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) |s`Kd-'|q  
    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 k!13=Gh  
    例如下所示: ; J2-rh  
    Sample name:  EDF-C1-56 'rx?hL3VW  
    Merging data from file EDF-C1-56 0-0.txt WF)s*$'uz;  
    Finished merging RPC data for sample EDF-C1-56 0P9Wy!f7  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt n2E4!L|q  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 KnFQ)sX^  
    a. 创建一个新的散射库 1"$R 3@s;  
    b. 散射模型命名 k5s?lWH  
    c. 改变散射模型为“Tabulated BSDF”. -aN":?8(G  
    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 ) ,TJ/3_lH  
    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。 X X&K=<,Ja  
    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 xSOoIsL[  
    g. 点击OK TMY{OI8a  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Mz}i[|U\  
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    脚本代码 7%YYr^d  
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    '#Language "WWB-COM" xiJz`KD&  
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    Option Explicit ' XEK&Yi1  
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    Sub Main gb9[Meg'  
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        'Cleanup pr)K{~m]{<  
        ClearOutputWindow() CHg]Ul  
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        Print "Merging RPC Photonics BSDF Data Files" |9x%gUm  
        SetTextColor(255,0,0) ?{n>EvLY  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 4%%B0[Wo_O  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 8 `o{b"l+  
        SetTextColor(0,0,0) ]|;7R^o3|  
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        'Current directory of this script (should be the same as the text files being merged) nx D'r  
        Dim cDir As String bD  d_}  
        cDir = MacroDir$ & "\" 7<fL[2-  
    Wf_CR(  
        'Array which will be populated with the list of files to be merged d RHlx QUn  
        Dim fList() As String, curFile As String i+U@\:=  
        GetFileList( cDir, fList ) _jiQL66pY  
    P_v0))n{  
        Print "" _F3KFQ4,S-  
        Print "Files found for merging:" ^zKt{a  
        For Each curFile In fList Ck:#1-t8{  
            Print Chr(9) & curFile ip<15;Z  
        Next id3)6}  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. te4F"SEf  
        Dim nameArray() As String, sampName As String };i&a%I|  
        nameArray = Split(fList(0)," 0-0.txt") F\zkyk 4  
        sampName  = nameArray(0)  { VS''Lv  
        Print "" =U=e?AOG2  
        Print "Sample name: " & Chr(9) & sampName w:ORmR .p  
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        'Open an output file and write the FRED header data =X)Q7u".7  
        Dim outFile As String -J-3_9I  
        outFile = cDir & sampName & "_FRED.txt" vsu@PuqH  
        Open outFile For Output As #1 e$ThSh\+(  
        Print #1, "type bsdf_data" [q|?f?Zl  
        Print #1, "format angles=deg bsdf=value scale=1" YgO aZqN  
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        'Loop the file list, skip the two header lines and write the remaining data to file c-[Q,c  
        Dim lineArray() As String, curLine As Long <$RS*n  
        For Each curFile In fList fO[Rf_  
            Print "Merging data from file " & curFile JZs|~@  
            ReadFile( cDir & curFile, lineArray ) 73'U#@g6  
            For curLine = 2 To UBound(lineArray) l81&[  
                Print #1, lineArray(curLine) %GVEY  
            Next ~C}(\8g  
        Next &:;/]cwj  
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        'Close the output file kS@9c _3S  
        Close #1 A6@+gP<  
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        Print "Finished merging RPC data for sample " & sampName -_y~rx >  
        Print "FRED formatted data file: " & Chr(9) & outFile 7bgnZ]r8t  
    End Sub Q\&AlV  
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    'Utility function to read the contents of a file into an array of strings. G=r(SJq  
    Function ReadFile(ByVal fileName As String, _ ^ I{R[O'8  
                      ByRef lineArray() As String) As Long (hhdbf  
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        ReadFile = -1 O4 +SD  
        Dim oFSO As Object eEZ|nEU  
        Set oFSO = CreateObject("Scripting.FileSystemObject") @&~OB/7B:  
        Erase lineArray Y(#d8o}}#  
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        Dim fid As Long *@\?}cX  
        If oFSO.fileexists( fileName ) Then J[<D/WIH  
            fid = FreeFile() wu&|~@_s@  
            Open fileName For Input As fid P+*rWJ8gQ  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) +(QMy&DtS  
            Close fid +LQs.*  
        End If eI/\I:G{f  
        Set oFSO = Nothing (/9.+V_  
        Return UBound( lineArray ) r|JiGj^om  
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    End Function e-Ybac%  
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    Sub GetFileList( ByVal in_dir As String, _ <6}f2^  
                     ByRef in_flist() As String ) ={mPg+Ei'  
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        'Redimension the file list array y 8d`},  
        Erase in_flist X>@.-{6T  
    ^7s6J {<  
        'Tracks how many files are found zfr(dQ  
        Dim fCount As Long QqFfR#  
        fCount = 0 !s[j1=y  
    Og;$P 'U  
        'Recurse directory and search for text files GdfK xSO  
        Dim f As String E/L?D  
        f = Dir$(in_dir & "*.txt") QkCoW[sn  
        While f <> "" XvzV lKL  
            ReDim Preserve in_flist(fCount) Xv5Ev@T  
            in_flist(fCount) = f c@o/Cv  
            fCount += 1 dS;|Kl[Om  
            f = Dir$() MBYD,v&  
        Wend 1O3<%T#LOZ  
        ReDim Preserve in_flist(fCount-1) Alk* "p  
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    End Sub RJ@e5A6_  
     
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