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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 we }#Ru*  
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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 TdNsyr}JG  
    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。 x}_rnf_  
    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。 >2nF"?"=  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Z0{f  
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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。 %;'~%\|dZM  
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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*32D8t`u  
    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 %bEGv:88s  
    例如下所示: >s44  
    Sample name:  EDF-C1-56 |G>q:]+AV  
    Merging data from file EDF-C1-56 0-0.txt Y=hP Erw  
    Finished merging RPC data for sample EDF-C1-56 ;g&7*1E  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt yY'gx|\  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 $#F;xys  
    a. 创建一个新的散射库 +}&pVe\t  
    b. 散射模型命名 #)Ep(2  
    c. 改变散射模型为“Tabulated BSDF”. hT\p)w  
    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 ) _F! :(@}  
    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。 mi*:S%;h  
    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 )J{.Cx<E  
    g. 点击OK =;kRk .qzy  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 $_ST:h&C  
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    脚本代码 -$xKv4  
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    '#Language "WWB-COM" Bi'I18<  
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    Option Explicit pHq{S;R2G  
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    Sub Main c& 9+/JYMo  
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        'Cleanup FRb&@(;  
        ClearOutputWindow() r!"CH5dT  
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        Print "Merging RPC Photonics BSDF Data Files" \Mobq  
        SetTextColor(255,0,0) L&+% Wd~  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." `HE>%=]b  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 95_[r$C  
        SetTextColor(0,0,0) #p11D= @[  
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        'Current directory of this script (should be the same as the text files being merged) *?EjYI  
        Dim cDir As String s@*,r@<  
        cDir = MacroDir$ & "\"  f'7 d4  
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        'Array which will be populated with the list of files to be merged : OS mr  
        Dim fList() As String, curFile As String }Bv30V2-(  
        GetFileList( cDir, fList ) 'p4da2%  
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        Print "" ' [7C~r{%  
        Print "Files found for merging:" wz*)L (pP  
        For Each curFile In fList ' lQ  
            Print Chr(9) & curFile Q' OuZKhA  
        Next G_7ks]u-  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. /6Jy'"+'0  
        Dim nameArray() As String, sampName As String eSQzjR*  
        nameArray = Split(fList(0)," 0-0.txt") v@}1WGY  
        sampName  = nameArray(0) 2 zmQp  
        Print "" .3S\Rrv  
        Print "Sample name: " & Chr(9) & sampName 1{;[q3a  
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        'Open an output file and write the FRED header data X#f+m) S  
        Dim outFile As String /)eNx  
        outFile = cDir & sampName & "_FRED.txt" =:ya;k&  
        Open outFile For Output As #1 LZZ:P  
        Print #1, "type bsdf_data" UH1S_:6  
        Print #1, "format angles=deg bsdf=value scale=1" 'p|Iwtjn>  
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        'Loop the file list, skip the two header lines and write the remaining data to file .O@q5G  
        Dim lineArray() As String, curLine As Long {GG~E54&B  
        For Each curFile In fList $Hl+iF4j<  
            Print "Merging data from file " & curFile mTI\,x%<OC  
            ReadFile( cDir & curFile, lineArray ) Sm*Jysy`  
            For curLine = 2 To UBound(lineArray) auyKLT3C  
                Print #1, lineArray(curLine) VDb,$i.Z0  
            Next Mo?t[]L   
        Next FBwncG$]F*  
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        'Close the output file e$FAhwpon  
        Close #1 +*r**(-Dm  
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        Print "Finished merging RPC data for sample " & sampName kL2Zr  
        Print "FRED formatted data file: " & Chr(9) & outFile q|Pt>4c5?  
    End Sub $jUS[.S_|I  
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    'Utility function to read the contents of a file into an array of strings. qD=m{O8%_  
    Function ReadFile(ByVal fileName As String, _ 6|"!sW`%N  
                      ByRef lineArray() As String) As Long b[&,%Sm+6  
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        ReadFile = -1 I ]WeZ,E  
        Dim oFSO As Object 7/U<\(V!g  
        Set oFSO = CreateObject("Scripting.FileSystemObject") JtrDZ;^@  
        Erase lineArray "Wn?8vR  
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        Dim fid As Long 4, *^QK  
        If oFSO.fileexists( fileName ) Then 6yl;o_6:  
            fid = FreeFile() %t5BB$y  
            Open fileName For Input As fid H-\ {w    
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) LGo@F;!n  
            Close fid GJ^]ER-K  
        End If *n|0\V<  
        Set oFSO = Nothing Uf2v$Jl+Yh  
        Return UBound( lineArray ) lu@>?,<  
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    End Function BJ.8OU*9]S  
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    Sub GetFileList( ByVal in_dir As String, _ eV {FcJha  
                     ByRef in_flist() As String ) $b i_i|?  
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        'Redimension the file list array % Dr4~7=7a  
        Erase in_flist ;~gd<KK  
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        'Tracks how many files are found Sfoy8<j  
        Dim fCount As Long  1u S>{M  
        fCount = 0 ?:''VM.  
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        'Recurse directory and search for text files ";S*[d.2tA  
        Dim f As String gHh.|PysW  
        f = Dir$(in_dir & "*.txt") N>nvt.`P  
        While f <> "" Dy{`">a  
            ReDim Preserve in_flist(fCount) Uh|__DUkh  
            in_flist(fCount) = f kFIB lPV  
            fCount += 1 :rs\ydDUF  
            f = Dir$() .dKRIFo  
        Wend FG5c:Ep  
        ReDim Preserve in_flist(fCount-1) )Y,?r[4{  
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    End Sub xjhAAM  
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