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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
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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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    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。 #wfR$Cd  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 `x3c},'@k  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 }^t?v*kcA  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 Bdi~ B")  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) _'Z@ < ,L  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 S6uBk"V!  
    例如下所示: coBxZyM 1}  
    Sample name:  EDF-C1-56 L '=3y$"],  
    Merging data from file EDF-C1-56 0-0.txt }N NyUwFa  
    Finished merging RPC data for sample EDF-C1-56 Sk xaSJ"  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 4U3T..wA  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 1x]G/I*  
    a. 创建一个新的散射库 ygHNAQG~  
    b. 散射模型命名 \W4SZR%u  
    c. 改变散射模型为“Tabulated BSDF”. />$kDe  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) G|V ^C_:  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 #*fB~Os:  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 >i '3\  
    g. 点击OK Z=ho7i  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Rh39x-`Z  
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    脚本代码 x~ I cSt  
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    '#Language "WWB-COM" r(RJ&\ !  
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    Option Explicit *%8dW  
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    Sub Main U`D"L4},.  
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        'Cleanup nRvV+F0#  
        ClearOutputWindow() &_ber ad  
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        Print "Merging RPC Photonics BSDF Data Files" Te;`-E L  
        SetTextColor(255,0,0) 5ES$qYN  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." FJ/kumq  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ]F,5Oh :OY  
        SetTextColor(0,0,0) {R(q7ALR  
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        'Current directory of this script (should be the same as the text files being merged) t1xX B^.M{  
        Dim cDir As String g8^$,  
        cDir = MacroDir$ & "\" {2-w<t  
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        'Array which will be populated with the list of files to be merged @A g=2\9  
        Dim fList() As String, curFile As String H`kfI"u8  
        GetFileList( cDir, fList ) ;vuok]@  
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        Print "" |ML|P\1&V  
        Print "Files found for merging:" od$Cm5  
        For Each curFile In fList s+,JwV?b  
            Print Chr(9) & curFile ZjbMk 3Y  
        Next )%P!<|s:5  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. _HGbR/  
        Dim nameArray() As String, sampName As String (FP- K  
        nameArray = Split(fList(0)," 0-0.txt") ZxY%x/K  
        sampName  = nameArray(0) Ea 0 j}  
        Print "" [/\}:#MLe  
        Print "Sample name: " & Chr(9) & sampName A(ql}cr  
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        'Open an output file and write the FRED header data kect)=T(  
        Dim outFile As String +uLl3(ml  
        outFile = cDir & sampName & "_FRED.txt" PIl:z?q({  
        Open outFile For Output As #1 ?`lIsd  
        Print #1, "type bsdf_data" AKu]c-  
        Print #1, "format angles=deg bsdf=value scale=1" CN+[|Mz*p  
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        'Loop the file list, skip the two header lines and write the remaining data to file ,'Zs")Ydp  
        Dim lineArray() As String, curLine As Long D.su^m_1  
        For Each curFile In fList  ]?M3X_Mq  
            Print "Merging data from file " & curFile !W^P|:Qt  
            ReadFile( cDir & curFile, lineArray ) B'SLyf  
            For curLine = 2 To UBound(lineArray) 8`Ih> D c  
                Print #1, lineArray(curLine) sQwRlx  
            Next fAYp\ k  
        Next > &tmdE  
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        'Close the output file o+*7Q!  
        Close #1 2K wr=t  
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        Print "Finished merging RPC data for sample " & sampName #:[^T,YD0  
        Print "FRED formatted data file: " & Chr(9) & outFile Tg/?v3M88  
    End Sub XN|[8+#U<@  
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    'Utility function to read the contents of a file into an array of strings. Qv1<)&Ft<  
    Function ReadFile(ByVal fileName As String, _ ?vh1 >1D  
                      ByRef lineArray() As String) As Long v-(dh5e` H  
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        ReadFile = -1 tqk^)c4FF(  
        Dim oFSO As Object Ndmki 7A  
        Set oFSO = CreateObject("Scripting.FileSystemObject") rUn1*KWbE  
        Erase lineArray T$!Pkdh  
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        Dim fid As Long ? R!Pf: t  
        If oFSO.fileexists( fileName ) Then N.'-9hv  
            fid = FreeFile() LiyR,e  
            Open fileName For Input As fid #V9do>Cu%  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) =W[M=_0u  
            Close fid T0|hp7WM  
        End If [[s^rC<d  
        Set oFSO = Nothing ,4mb05w;d  
        Return UBound( lineArray ) tf IUH'Ez>  
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    End Function M.qE$  
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    Sub GetFileList( ByVal in_dir As String, _ z"\<GmvB  
                     ByRef in_flist() As String ) 'r'+$D7  
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        'Redimension the file list array q"0_Px9P  
        Erase in_flist 6DVHJ+WTV  
    AB+HyZ*//  
        'Tracks how many files are found +OaBA>Jh9  
        Dim fCount As Long c8h71Cr  
        fCount = 0 ovk^  
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        'Recurse directory and search for text files E>c*A40=.n  
        Dim f As String b Bkg/p]  
        f = Dir$(in_dir & "*.txt") f]NaQ!. 7  
        While f <> "" wd*V,ZN7  
            ReDim Preserve in_flist(fCount) nTv^][  
            in_flist(fCount) = f yk0^m/=C(  
            fCount += 1 o*5b]XWw  
            f = Dir$() `3^%ft~l  
        Wend Z{^Pnit  
        ReDim Preserve in_flist(fCount-1) f?lnBvT|b  
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    End Sub Pd+Wb3  
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