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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 /s%-c!o^  
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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 shL_{}  
    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。 88<d<)7t  
    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。 `n-/~7  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 3N!v"2!#  
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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。 >);M\,1\I  
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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) z>0$SBQ-  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 {S-M]LE  
    例如下所示: O(-6Zqk8Q  
    Sample name:  EDF-C1-56 YahW%mv`d  
    Merging data from file EDF-C1-56 0-0.txt wj0_X;L  
    Finished merging RPC data for sample EDF-C1-56 P.Cn[64a+@  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt gBWr)R  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ^~TE$i<   
    a. 创建一个新的散射库 7LM&3mA<  
    b. 散射模型命名 6vTnm4  
    c. 改变散射模型为“Tabulated BSDF”. eHKb`K7C.  
    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 ) LkK&<z  
    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。  q^6#.}  
    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 T*Ge67  
    g. 点击OK D+ .vg?8  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ki2 `gLK  
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    脚本代码 fuCt9Kjo<  
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    '#Language "WWB-COM" FqGMHM\J  
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    Option Explicit (E,[Ad,$  
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    Sub Main 2!CL8hG5:  
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        'Cleanup 9M1DE  
        ClearOutputWindow() Btr>ek  
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        Print "Merging RPC Photonics BSDF Data Files" Z 5P4 H  
        SetTextColor(255,0,0) (Uu5$q(  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ]B~ (yh  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." lt]&o0>  
        SetTextColor(0,0,0) ^5?|Dj  
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        'Current directory of this script (should be the same as the text files being merged) `(P71T  
        Dim cDir As String 31#jLWY'0  
        cDir = MacroDir$ & "\" aMkuyqPf{  
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        'Array which will be populated with the list of files to be merged PQYJn x}  
        Dim fList() As String, curFile As String 8r@GoG>  
        GetFileList( cDir, fList ) hgDFhbHtd6  
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        Print "" Qgf|obrEi6  
        Print "Files found for merging:" _ /.VXW  
        For Each curFile In fList {-]K!tWda  
            Print Chr(9) & curFile iyUnxqP  
        Next =;) =,+V~q  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. [TqX"@4NS  
        Dim nameArray() As String, sampName As String "WXUz  
        nameArray = Split(fList(0)," 0-0.txt") 4k<U5J  
        sampName  = nameArray(0) @;{ZnRv14  
        Print "" _F4=+dT|  
        Print "Sample name: " & Chr(9) & sampName KiE'O{Y  
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        'Open an output file and write the FRED header data nG?Z* n  
        Dim outFile As String ;<+Z}d/g9  
        outFile = cDir & sampName & "_FRED.txt" v/$<#2|  
        Open outFile For Output As #1 Ytqx 0  
        Print #1, "type bsdf_data" FLkZZ\  
        Print #1, "format angles=deg bsdf=value scale=1" \S?-[v*{  
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        'Loop the file list, skip the two header lines and write the remaining data to file e85E+S%  
        Dim lineArray() As String, curLine As Long meThjCC  
        For Each curFile In fList %=s2>vv9  
            Print "Merging data from file " & curFile E0!0 uSg&  
            ReadFile( cDir & curFile, lineArray ) XMxm2-%olP  
            For curLine = 2 To UBound(lineArray) ^)|tf\4  
                Print #1, lineArray(curLine) 5*90t{#  
            Next KRP6b:+4L  
        Next ]1h9:PF  
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        'Close the output file Gtvbm  
        Close #1 h{jm  
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        Print "Finished merging RPC data for sample " & sampName r9D 68*H  
        Print "FRED formatted data file: " & Chr(9) & outFile @.G;dL.f{  
    End Sub ICG:4n(,  
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    'Utility function to read the contents of a file into an array of strings. C&EA@U5X^  
    Function ReadFile(ByVal fileName As String, _ rV-Xsf7Z  
                      ByRef lineArray() As String) As Long o##!S6:A  
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        ReadFile = -1 %_>8.7  
        Dim oFSO As Object Dv^M/z2&[  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 4T){z^"  
        Erase lineArray tTt}=hQpgX  
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        Dim fid As Long Fd%JF#Hk  
        If oFSO.fileexists( fileName ) Then "b)EH/ s  
            fid = FreeFile() d@Wze[M?0  
            Open fileName For Input As fid ;1r|Bx<5  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) *d 4A3|  
            Close fid yi-0CHo  
        End If lXVh`+X/l  
        Set oFSO = Nothing .`&k`  
        Return UBound( lineArray ) I(/*pa?m{  
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    End Function \34:]NM  
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    Sub GetFileList( ByVal in_dir As String, _ C+Wa(K  
                     ByRef in_flist() As String ) idjk uB(6  
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        'Redimension the file list array @ykl:K%ke  
        Erase in_flist <(45(6fQ  
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        'Tracks how many files are found $+U 6c~^^  
        Dim fCount As Long {!1RlW  
        fCount = 0 8rLhOA  
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        'Recurse directory and search for text files (De>k8  
        Dim f As String :=:m4UJb  
        f = Dir$(in_dir & "*.txt") b4(,ls  
        While f <> "" Q-yNw0V}F  
            ReDim Preserve in_flist(fCount) n8z++ T&  
            in_flist(fCount) = f M'pIAm1p  
            fCount += 1 ZT<VDcP{  
            f = Dir$() )E^Pn|H  
        Wend  ;B{oGy.  
        ReDim Preserve in_flist(fCount-1) d@ ] N  
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    End Sub cG1iO:  
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