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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 <'QH e4  
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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 +\9Y;N y  
    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。 >L?)f3_a  
    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。 72} MspzUt  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 KcP86H52I  
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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。 =kohQ d.n  
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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) a;m-Vu!  
    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 `p9h$d  
    例如下所示: \(jSkrrD  
    Sample name:  EDF-C1-56 f;#hcRSH  
    Merging data from file EDF-C1-56 0-0.txt ? e%Pvy<i  
    Finished merging RPC data for sample EDF-C1-56 g+p?J.+  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt R`Hyg4?  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Fsv%=E{  
    a. 创建一个新的散射库 UceZW tYa  
    b. 散射模型命名 HgE^#qD?  
    c. 改变散射模型为“Tabulated BSDF”. 9f;\fe  
    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&B&!&gZ  
    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。 +LV~%?W  
    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 /og2+!  
    g. 点击OK v"6q!  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 |#$Wh+,*  
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    脚本代码 $d%m%SZxv  
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    '#Language "WWB-COM" 828E^Q"<  
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    Option Explicit Z.<OtsQN  
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    Sub Main #A@*k}/+  
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        'Cleanup E"&fT!yi  
        ClearOutputWindow() " GkBX  
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        Print "Merging RPC Photonics BSDF Data Files" qYZX, x  
        SetTextColor(255,0,0) bcC ;i~9  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 6;9SU+/  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." dGMBgj  
        SetTextColor(0,0,0) >%x7-->IB  
    U)=?3}s(  
        'Current directory of this script (should be the same as the text files being merged) C^XJE1D.  
        Dim cDir As String wqJ^tA!  
        cDir = MacroDir$ & "\" ZJ'#XZpr  
    :84fd\It4  
        'Array which will be populated with the list of files to be merged ?V"X=B2  
        Dim fList() As String, curFile As String l_Ftt N  
        GetFileList( cDir, fList ) _C DUUr  
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        Print "" c?"#x-<1s  
        Print "Files found for merging:" L+7L0LbNU  
        For Each curFile In fList h)7{Cj  
            Print Chr(9) & curFile xrxORtJ<  
        Next !"j?dQ.U;  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 2G<\Wz  
        Dim nameArray() As String, sampName As String \-$wY%7  
        nameArray = Split(fList(0)," 0-0.txt") ,1EyT>  
        sampName  = nameArray(0) 7RM$%'n \  
        Print "" PsMoH/+"  
        Print "Sample name: " & Chr(9) & sampName %WiDz0o  
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        'Open an output file and write the FRED header data n.n;'p9t@  
        Dim outFile As String e82SG8#]  
        outFile = cDir & sampName & "_FRED.txt" a` A V  
        Open outFile For Output As #1 b/HhGA0  
        Print #1, "type bsdf_data" 4\a KC%5  
        Print #1, "format angles=deg bsdf=value scale=1" v\PqhIy"  
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        'Loop the file list, skip the two header lines and write the remaining data to file [Nbs{f^J=  
        Dim lineArray() As String, curLine As Long #S)+eH  
        For Each curFile In fList .;)7)%  
            Print "Merging data from file " & curFile k#NIY4%.  
            ReadFile( cDir & curFile, lineArray ) "MQy>mD6  
            For curLine = 2 To UBound(lineArray) SB0Cq  
                Print #1, lineArray(curLine) Z5/^pyc  
            Next 8+5# FC7  
        Next #kjN!S*=  
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        'Close the output file *UhYX)J  
        Close #1 jU.z{(s  
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        Print "Finished merging RPC data for sample " & sampName Vw :.'-Oi  
        Print "FRED formatted data file: " & Chr(9) & outFile jI %v[]V  
    End Sub #pO=\lJ,  
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    'Utility function to read the contents of a file into an array of strings. ZmeSm& hQ_  
    Function ReadFile(ByVal fileName As String, _ L"{qF<@V7&  
                      ByRef lineArray() As String) As Long >uT,Z,7O  
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        ReadFile = -1 ~Gm<F .(+  
        Dim oFSO As Object nb dm@   
        Set oFSO = CreateObject("Scripting.FileSystemObject") no_;^Ou?  
        Erase lineArray mrWPTCD{  
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        Dim fid As Long RQxL`7H  
        If oFSO.fileexists( fileName ) Then qM78s>\-h  
            fid = FreeFile() (37dD!  
            Open fileName For Input As fid @i2"+_}*  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 3}R}|Ha J#  
            Close fid NV\t%/ ?  
        End If l7#5.%A  
        Set oFSO = Nothing 1oU/gm$7\q  
        Return UBound( lineArray ) xe?!UCUb@  
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    End Function m#6RJbEz  
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    Sub GetFileList( ByVal in_dir As String, _ S;@nPzhc  
                     ByRef in_flist() As String ) `R[cM; c2  
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        'Redimension the file list array `|kW%L4  
        Erase in_flist 8R|!$P  
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        'Tracks how many files are found TL u+5f  
        Dim fCount As Long p1t qwV  
        fCount = 0 rSu+zS7`X  
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        'Recurse directory and search for text files 6[+@#IWx  
        Dim f As String K(jo[S  
        f = Dir$(in_dir & "*.txt") n vzk P{  
        While f <> "" (U@Ks )  
            ReDim Preserve in_flist(fCount) k-it#'ll{x  
            in_flist(fCount) = f "06t"u<%  
            fCount += 1 @vyq?H$U;N  
            f = Dir$() Cp"a,%b6u  
        Wend h;TN$ /  
        ReDim Preserve in_flist(fCount-1) V[DiN~H  
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    End Sub <|-da&7  
     
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