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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 ggR--`D[  
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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 ~il{6Z+#n  
    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。 e~wJO~  
    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。 5r$ X  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 w|uO)/v  
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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。 W?B(Jsv  
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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) i{$h]D_fD  
    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 Po: )b  
    例如下所示: # XD-a  
    Sample name:  EDF-C1-56 -a}d @&  
    Merging data from file EDF-C1-56 0-0.txt 08!pLE  
    Finished merging RPC data for sample EDF-C1-56 N{f4-i~  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt +[DL]e]@U  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 y<<:6OBj  
    a. 创建一个新的散射库 %qM3IVPK)q  
    b. 散射模型命名 v .ftfL!  
    c. 改变散射模型为“Tabulated BSDF”. +cw;a]o^>  
    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 ) _(q|W3  
    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。 r95l.v  
    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 e[lRY>Pe5  
    g. 点击OK $6c8<!B_  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 "F*'UfOwrZ  
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    脚本代码 y'9 bs  
    :!wdqn  
    '#Language "WWB-COM" r`THOj\cM  
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    Option Explicit r=" wd  
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    Sub Main WaV P+Ap  
    }/%(7Ff{  
        'Cleanup }wJDHgt]-p  
        ClearOutputWindow() <V3N!H_d  
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        Print "Merging RPC Photonics BSDF Data Files" mkCv  f  
        SetTextColor(255,0,0) Y2DR oQ  
        Print "Note: Script should be located in the same folder as the BSDF TXT files."  4I> I  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 0#}@- e  
        SetTextColor(0,0,0) _%)v9}D  
    DO!?]"  
        'Current directory of this script (should be the same as the text files being merged) mxYsP6&  
        Dim cDir As String dJhT}"x  
        cDir = MacroDir$ & "\" !KUV ,>L  
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        'Array which will be populated with the list of files to be merged Ba$Ibq,r/  
        Dim fList() As String, curFile As String GHMoT  
        GetFileList( cDir, fList ) g2=5IU<  
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        Print "" 0Wf,SYx`s  
        Print "Files found for merging:" T5eXcI0t  
        For Each curFile In fList >qJRpO  
            Print Chr(9) & curFile {=AK  |  
        Next 4JTFdbx  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. V}l >p?  
        Dim nameArray() As String, sampName As String QY,.|  
        nameArray = Split(fList(0)," 0-0.txt") HR85!S`  
        sampName  = nameArray(0) 8 0>qqz  
        Print "" .TN9N  
        Print "Sample name: " & Chr(9) & sampName a*}ZT,V  
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        'Open an output file and write the FRED header data zS*X9|p  
        Dim outFile As String \ORNOX:  
        outFile = cDir & sampName & "_FRED.txt" =TDK$Ek  
        Open outFile For Output As #1 ]_S&8F}|  
        Print #1, "type bsdf_data" D?u*^?a2  
        Print #1, "format angles=deg bsdf=value scale=1" M]?#]3XBNo  
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        'Loop the file list, skip the two header lines and write the remaining data to file Ks.pb !r  
        Dim lineArray() As String, curLine As Long K8.=bGyg  
        For Each curFile In fList "}i\" x;s  
            Print "Merging data from file " & curFile ;as4EqiK  
            ReadFile( cDir & curFile, lineArray ) llbj-9OZL  
            For curLine = 2 To UBound(lineArray) 8v6YOG"b q  
                Print #1, lineArray(curLine) :^DuB_  
            Next S6 F28 d[j  
        Next R{~Yh.)~  
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        'Close the output file 8>TDrpT}  
        Close #1 9-DDly [)4  
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        Print "Finished merging RPC data for sample " & sampName @0q%&v0  
        Print "FRED formatted data file: " & Chr(9) & outFile .(tga&]  
    End Sub goi5I(yn^  
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    'Utility function to read the contents of a file into an array of strings. -Cxk#-sb#  
    Function ReadFile(ByVal fileName As String, _ d,|W  
                      ByRef lineArray() As String) As Long odPq<'V|AY  
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        ReadFile = -1 8t!/O p ?  
        Dim oFSO As Object 4/$ $?w4  
        Set oFSO = CreateObject("Scripting.FileSystemObject") lHwQ'/r  
        Erase lineArray M3j_sd'N  
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        Dim fid As Long " 1YARGu  
        If oFSO.fileexists( fileName ) Then Zqke8q  
            fid = FreeFile() s@C@q(i6  
            Open fileName For Input As fid C8%Io l  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) l6.z-Qw  
            Close fid $ u`y  
        End If |q5R5 mQ  
        Set oFSO = Nothing h_4o4#  
        Return UBound( lineArray ) xI}h{AF7  
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    End Function )/h~csy:~  
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    Sub GetFileList( ByVal in_dir As String, _ c *(]pM  
                     ByRef in_flist() As String ) ]R/VE"-  
    ]sJWiIe.  
        'Redimension the file list array XM$r,}B k  
        Erase in_flist +2=N#LM  
    -tWkN^j8+  
        'Tracks how many files are found zp>q$e40  
        Dim fCount As Long <;:M:{RZY  
        fCount = 0 I ;N)jj`b  
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        'Recurse directory and search for text files s4bLL  
        Dim f As String +5Yc/Qp  
        f = Dir$(in_dir & "*.txt") "q4c[dna  
        While f <> "" ++-\^'&1  
            ReDim Preserve in_flist(fCount) #uJGXrGt=  
            in_flist(fCount) = f yzW9A=0A)  
            fCount += 1 }wrZP}zM>  
            f = Dir$() RuDn1h#u{  
        Wend S+A'\{f  
        ReDim Preserve in_flist(fCount-1) ig^9lM'  
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    End Sub E_]L8UC;m  
     
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