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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 uiVN z8H  
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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 s-$ Wc) l  
    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。 !6KX^j-  
    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。 X zJ#)}f  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 eV[{c %wN:  
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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。 `tkoS  
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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) ?woL17Gt  
    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&_03  
    例如下所示: i]v3CY|3AI  
    Sample name:  EDF-C1-56 'J,UKK\5  
    Merging data from file EDF-C1-56 0-0.txt 2dD" ^z{  
    Finished merging RPC data for sample EDF-C1-56 jeu'K vhe  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 9/k2 zXY  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 )A8#cY!<  
    a. 创建一个新的散射库 Uwc%'=@  
    b. 散射模型命名 )|~&(+Q?]  
    c. 改变散射模型为“Tabulated BSDF”. ZcN0:xU  
    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 ) ;6G]~}>o  
    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。 e~]P _53  
    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 f%]@e9dD  
    g. 点击OK ZISIW!  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 1bFZyD"  
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    脚本代码 w2s`9  
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    '#Language "WWB-COM" Bhv;l/K])  
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    Option Explicit Y&6jFT_  
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    Sub Main '12m4quO  
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        'Cleanup >z<L60S  
        ClearOutputWindow() [k7( t|Q{  
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        Print "Merging RPC Photonics BSDF Data Files" iC#a+G*N_M  
        SetTextColor(255,0,0) F5*-HR  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." n!4}Hwz!  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Y=XDN:  
        SetTextColor(0,0,0) 3r~8:F"g  
    8-;.Ejz!\A  
        'Current directory of this script (should be the same as the text files being merged) x6/u+Urn  
        Dim cDir As String D?KLV _Op  
        cDir = MacroDir$ & "\" Otq3nBZ  
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        'Array which will be populated with the list of files to be merged RuHDAJ"&a  
        Dim fList() As String, curFile As String G#7*O`  
        GetFileList( cDir, fList ) awzlLI<2p  
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        Print "" hC$e8t60  
        Print "Files found for merging:" <aPZE6z  
        For Each curFile In fList {QEvc  
            Print Chr(9) & curFile K3zY-yIco  
        Next G? SPz  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. c]*yo  
        Dim nameArray() As String, sampName As String o6u^hG6~'  
        nameArray = Split(fList(0)," 0-0.txt") 94!} Z>  
        sampName  = nameArray(0) {L$$"r,  
        Print "" "-:H$  
        Print "Sample name: " & Chr(9) & sampName }0&Fu?sP  
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        'Open an output file and write the FRED header data $?ss5: S  
        Dim outFile As String -o/Vp>_UOE  
        outFile = cDir & sampName & "_FRED.txt" nKE^km  
        Open outFile For Output As #1 61_PSScSY  
        Print #1, "type bsdf_data" IR"C?  
        Print #1, "format angles=deg bsdf=value scale=1" `C4(C4u  
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        'Loop the file list, skip the two header lines and write the remaining data to file +=W(c8~P  
        Dim lineArray() As String, curLine As Long @0@WklAJA  
        For Each curFile In fList Eq_@ xT0>  
            Print "Merging data from file " & curFile N!7?D'y   
            ReadFile( cDir & curFile, lineArray ) U/Cc!WXV]  
            For curLine = 2 To UBound(lineArray) $bhI2%_`M  
                Print #1, lineArray(curLine) 3=wcA/"!  
            Next EwBrOq`C  
        Next U9BhtmY  
    TTO8tT3[6}  
        'Close the output file -medD G  
        Close #1 /\,3AInLb  
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        Print "Finished merging RPC data for sample " & sampName C#[P<=v  
        Print "FRED formatted data file: " & Chr(9) & outFile *lDVV,T'}w  
    End Sub NP3 e^  
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    'Utility function to read the contents of a file into an array of strings. rrC\4#H[??  
    Function ReadFile(ByVal fileName As String, _ )W_akUL  
                      ByRef lineArray() As String) As Long R.1.LB  
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        ReadFile = -1 0`pCgF  
        Dim oFSO As Object zZd.U\"2  
        Set oFSO = CreateObject("Scripting.FileSystemObject") A pzC  
        Erase lineArray `j3 OFC{7E  
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        Dim fid As Long g\B ? |%  
        If oFSO.fileexists( fileName ) Then $J4)z&%dr  
            fid = FreeFile() iYiTkq  
            Open fileName For Input As fid SDbkPx  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) y ~-v0/  
            Close fid E#d~.#uH  
        End If *|q{(KX  
        Set oFSO = Nothing mCn:{G8+  
        Return UBound( lineArray ) M4|ION  
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    End Function ;[4=?GL*  
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    Sub GetFileList( ByVal in_dir As String, _ J>M9t%f@  
                     ByRef in_flist() As String ) [zl4"|_`  
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        'Redimension the file list array hKg +A  
        Erase in_flist cD9U ^SOS  
    e2fv%  
        'Tracks how many files are found UFZOu%Y  
        Dim fCount As Long AcJrJS)~  
        fCount = 0 Sz|kXk6&9  
    @8w[Zo~  
        'Recurse directory and search for text files tYgHJ~1L*  
        Dim f As String w)&4i$Lk6  
        f = Dir$(in_dir & "*.txt") Z0M,YSnz  
        While f <> "" )Ft+eMYti[  
            ReDim Preserve in_flist(fCount) ?x 0gI   
            in_flist(fCount) = f @#^Y# rxb  
            fCount += 1 z&c}  
            f = Dir$() ePq(.o  
        Wend @+nCNXK  
        ReDim Preserve in_flist(fCount-1) PZ#up{[o  
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    End Sub _KtV`bF  
     
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