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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 A:eG5K}  
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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 G AQ 'Ti1!  
    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。 TFy7HX\Oq  
    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。 4 \p -TPM  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 8Mu;U3cIW  
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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。 B!bsTvX  
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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) ( KTnJZ  
    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 7yI`e*EOD  
    例如下所示: $ D'^t(  
    Sample name:  EDF-C1-56 wGJjA=C  
    Merging data from file EDF-C1-56 0-0.txt gi]ZG  
    Finished merging RPC data for sample EDF-C1-56 |;u}sX1t9  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 0@)%h&mD  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 F>+2DlA`<e  
    a. 创建一个新的散射库 gWrAUPS[  
    b. 散射模型命名 @T&t.|`  
    c. 改变散射模型为“Tabulated BSDF”. iePf ]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 ) xNpg{cQ=  
    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。 lJ{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 1pP1d%  
    g. 点击OK >t3'_cBC!  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 6:?rlh  
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    脚本代码 <\@ 1Zz@ms  
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    '#Language "WWB-COM" ^bUxLa[.  
    '{ f=hE_/  
    Option Explicit Y ?'tUV  
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    Sub Main ;=jr0\|e  
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        'Cleanup LdTdQ,s<  
        ClearOutputWindow() a<m-V&4x  
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        Print "Merging RPC Photonics BSDF Data Files" 'r+PH*Mr  
        SetTextColor(255,0,0) |dmh  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." +.Bmkim  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 9"sDm}5%  
        SetTextColor(0,0,0) .Q&rfH3  
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        'Current directory of this script (should be the same as the text files being merged) (j&A",^^S  
        Dim cDir As String V 0{tap}  
        cDir = MacroDir$ & "\" Yck~xt&]  
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        'Array which will be populated with the list of files to be merged wJG$c-(\0  
        Dim fList() As String, curFile As String u&]vd /  
        GetFileList( cDir, fList ) $%2H6Eg0  
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        Print "" ~kKrDLW+  
        Print "Files found for merging:" {6 .o=EyM{  
        For Each curFile In fList kzO&24  
            Print Chr(9) & curFile ULBg {e?l8  
        Next A6UO0lyu  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. .ve *Vp  
        Dim nameArray() As String, sampName As String zAScRg$:?  
        nameArray = Split(fList(0)," 0-0.txt") l@~LV}BI  
        sampName  = nameArray(0) \#dl6:"  
        Print "" .T.5TMiOSq  
        Print "Sample name: " & Chr(9) & sampName NZXjE$<Vr  
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        'Open an output file and write the FRED header data x?r1s#88>  
        Dim outFile As String lDc;__}Ws  
        outFile = cDir & sampName & "_FRED.txt" |M5-5)  
        Open outFile For Output As #1 7#-y-B]l  
        Print #1, "type bsdf_data" z?ucIsbR  
        Print #1, "format angles=deg bsdf=value scale=1" c[cAUsk i  
    7#2j>G{?]v  
        'Loop the file list, skip the two header lines and write the remaining data to file UG[e//m  
        Dim lineArray() As String, curLine As Long or?%-)  
        For Each curFile In fList BW Uq%o,@g  
            Print "Merging data from file " & curFile JlZ0n;  
            ReadFile( cDir & curFile, lineArray ) < {ru|-9  
            For curLine = 2 To UBound(lineArray) ~OFvu}]  
                Print #1, lineArray(curLine) 8i 0  
            Next J7&DR^.Sw  
        Next `l]j#qshTm  
    9 $l>\.6  
        'Close the output file 4$"DbaC  
        Close #1 IazkdJX~  
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        Print "Finished merging RPC data for sample " & sampName /c-nE3+rn  
        Print "FRED formatted data file: " & Chr(9) & outFile KCR N}`^  
    End Sub M##';x0  
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    'Utility function to read the contents of a file into an array of strings. bEH de*q(  
    Function ReadFile(ByVal fileName As String, _ rT7^-B*  
                      ByRef lineArray() As String) As Long $Ua56Y  
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        ReadFile = -1 B BL485`  
        Dim oFSO As Object 3 <SqoJSp  
        Set oFSO = CreateObject("Scripting.FileSystemObject")  46,j9x  
        Erase lineArray KL3<Iz]  
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        Dim fid As Long O!R"v'  
        If oFSO.fileexists( fileName ) Then ')#,X^   
            fid = FreeFile() zg}YGu|J  
            Open fileName For Input As fid F=wRkU  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) $\\lx_)  
            Close fid UuJjO^t  
        End If |X(2Zv^O  
        Set oFSO = Nothing @h?crJ6$  
        Return UBound( lineArray ) pR$6,Vi  
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    End Function p2pAvlNoF  
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    Sub GetFileList( ByVal in_dir As String, _ -q>^ALf|@>  
                     ByRef in_flist() As String ) :BZ0 7`9  
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        'Redimension the file list array EESN\_{~.  
        Erase in_flist bI ITPxz  
    _N#&psQzw  
        'Tracks how many files are found j4.&l3  
        Dim fCount As Long ;5S}~+j  
        fCount = 0 SBfFZw)  
    zICI_*~  
        'Recurse directory and search for text files ecHP &Z$  
        Dim f As String Wd 2sh  
        f = Dir$(in_dir & "*.txt") tS?lB05TOR  
        While f <> "" h%}( h2 W  
            ReDim Preserve in_flist(fCount) p+w8$8)  
            in_flist(fCount) = f Fwfo2   
            fCount += 1  v[,Src  
            f = Dir$() X;GfPw.m  
        Wend i@$*Csj\9*  
        ReDim Preserve in_flist(fCount-1) F:T GsV#  
    #@//7Bf%  
    End Sub r/r:oXK  
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