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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 Q@7-UIV|q  
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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 *2$I, ~(P  
    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。 jK#[r[q{  
    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。 3L;GfYr0  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 > @Ux8#  
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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。 "zT#*>U  
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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) qre.^6x  
    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 qyfw$$X  
    例如下所示: _N.N?>  
    Sample name:  EDF-C1-56 i2PPVT  
    Merging data from file EDF-C1-56 0-0.txt S\qYw(G  
    Finished merging RPC data for sample EDF-C1-56 kF09t5Lr  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt m{U+aqAQK  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 U~,~GU=X  
    a. 创建一个新的散射库 /uTU*Oe  
    b. 散射模型命名 :3,aR\  
    c. 改变散射模型为“Tabulated BSDF”. nm!5L[y!0  
    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 ) ?qn0].  
    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。 ~S\Ee 2e>  
    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 }d,iA FG  
    g. 点击OK 2{<5?Op  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Cst:5m0!  
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    脚本代码 \= M*x  
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    '#Language "WWB-COM" 7?@s.Sz|fV  
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    Option Explicit (s/hK  
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    Sub Main De^GWO.?bT  
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        'Cleanup 0;*1g47\  
        ClearOutputWindow() t%<@k)hd~G  
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        Print "Merging RPC Photonics BSDF Data Files" LuM[*_8  
        SetTextColor(255,0,0) w8|38m  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." B( ]=I@L=W  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." tgu}^TfKkg  
        SetTextColor(0,0,0) kIHfLwh9N  
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        'Current directory of this script (should be the same as the text files being merged) pRt=5WZ  
        Dim cDir As String .t/XW++  
        cDir = MacroDir$ & "\" D[.;-4"_  
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        'Array which will be populated with the list of files to be merged `@8QQB  
        Dim fList() As String, curFile As String ";jj`  
        GetFileList( cDir, fList ) ;QT.|.t6  
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        Print "" 3y}0J @  
        Print "Files found for merging:" K._tCB:  
        For Each curFile In fList dtK[H+  
            Print Chr(9) & curFile a$ f$CjQ  
        Next ={Bcbj{  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. gbP]!d:I  
        Dim nameArray() As String, sampName As String ]!yuD/4A  
        nameArray = Split(fList(0)," 0-0.txt") -Y#YwBy;M  
        sampName  = nameArray(0) Q@]QPpe  
        Print "" {uO=Wkp~7  
        Print "Sample name: " & Chr(9) & sampName HPGMR4=ANS  
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        'Open an output file and write the FRED header data Z.a`S~U  
        Dim outFile As String kaSy 9Y{  
        outFile = cDir & sampName & "_FRED.txt" S#IlWU  
        Open outFile For Output As #1 b' 1%g}  
        Print #1, "type bsdf_data" [.M<h^xrB  
        Print #1, "format angles=deg bsdf=value scale=1" ,KXS6:1%5Y  
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        'Loop the file list, skip the two header lines and write the remaining data to file }9w?[hXW"  
        Dim lineArray() As String, curLine As Long 7Eo a~  
        For Each curFile In fList Lh0qB)>  
            Print "Merging data from file " & curFile L&[uE;ro  
            ReadFile( cDir & curFile, lineArray ) B}Q.Is5  
            For curLine = 2 To UBound(lineArray) =!rdn#KH  
                Print #1, lineArray(curLine) U)Cv_qe  
            Next ]a4rA+NFLB  
        Next |@{4zoP_N  
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        'Close the output file *]<M%q!<6  
        Close #1 SE%B&8ZD  
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        Print "Finished merging RPC data for sample " & sampName lTl-<E;  
        Print "FRED formatted data file: " & Chr(9) & outFile (*{Y#XD{  
    End Sub -+^E5  
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    'Utility function to read the contents of a file into an array of strings. ~b.C[s  
    Function ReadFile(ByVal fileName As String, _ *D&(6$[^  
                      ByRef lineArray() As String) As Long 11%<bmJ]Q3  
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        ReadFile = -1 (9!$p|d*  
        Dim oFSO As Object X?m"86L  
        Set oFSO = CreateObject("Scripting.FileSystemObject")  4x.1J  
        Erase lineArray 3q{op9_T7  
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        Dim fid As Long )tB:g.2k  
        If oFSO.fileexists( fileName ) Then ELh`|X  
            fid = FreeFile() :A+nmz!z  
            Open fileName For Input As fid b`?$;5  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) }$6;g-|HX  
            Close fid e^;<T9Esr  
        End If .Ux bwTup  
        Set oFSO = Nothing r_m*$r~f  
        Return UBound( lineArray ) gP&G63^  
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    End Function &NvvaqJ  
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    Sub GetFileList( ByVal in_dir As String, _ ]: VR3e"H  
                     ByRef in_flist() As String ) rCOH*m&  
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        'Redimension the file list array 1y\ -Iz^  
        Erase in_flist {51<EvyE*  
    5u\#@% \6  
        'Tracks how many files are found +48a..4sN  
        Dim fCount As Long 1N8:,bpsT  
        fCount = 0 "])yV    
    $~$NQe!/  
        'Recurse directory and search for text files 7w}PYp1Z'~  
        Dim f As String qfRsp rRI"  
        f = Dir$(in_dir & "*.txt") h'Gs$o7#P  
        While f <> "" Wt$" f  
            ReDim Preserve in_flist(fCount) |f9fq~'1e  
            in_flist(fCount) = f 7/$r  
            fCount += 1 adi^*7Q] )  
            f = Dir$() y7iHB k"^:  
        Wend @-^jbmu^ P  
        ReDim Preserve in_flist(fCount-1) <=1nr@L  
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    End Sub ;|C[.0;kgv  
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