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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 NypM+y  
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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 A94ZG:   
    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。 oa$-o/DhB  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 i"Hec9Ri  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 \fIGMoy!  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 e\%+~GUTC=  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) /~[+'  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 lx$]f)%~  
    例如下所示: =NLsT.aa  
    Sample name:  EDF-C1-56 huFT_z_;;  
    Merging data from file EDF-C1-56 0-0.txt ~sj'GEhEg  
    Finished merging RPC data for sample EDF-C1-56 %Z9&zmO  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt <"F\&M`G  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 07 [%RG  
    a. 创建一个新的散射库 jN 9|q  
    b. 散射模型命名 =<Q_&_.60  
    c. 改变散射模型为“Tabulated BSDF”. ap;?[B~Ga  
    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 ) )@+lfIE(l  
    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。 gv)F`uRWA  
    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 D#Qfa!=g  
    g. 点击OK +c;/hM<IX.  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 f d~a\5%e  
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    脚本代码 YuufgPE*H  
    !-%fCg(B  
    '#Language "WWB-COM" ETU.v*HT]  
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    Option Explicit k\->uSU9  
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    Sub Main =P'33) \ )  
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        'Cleanup qZw4"&,j$  
        ClearOutputWindow() >d#oJ?goX  
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        Print "Merging RPC Photonics BSDF Data Files" }#0MJ6L  
        SetTextColor(255,0,0) qkQ _#  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." CUJP"u>8M  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." LF o{,%B  
        SetTextColor(0,0,0) ) D_ZZPq_  
    BCnf'0q  
        'Current directory of this script (should be the same as the text files being merged) r*$$82s  
        Dim cDir As String ttQX3rmF01  
        cDir = MacroDir$ & "\" MtE18m "z  
    C-25\  
        'Array which will be populated with the list of files to be merged [f`^+,U  
        Dim fList() As String, curFile As String ifA=qn0=}  
        GetFileList( cDir, fList ) ^Ej4^d  
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        Print "" QG{).|pm  
        Print "Files found for merging:" !%w#h0(b  
        For Each curFile In fList jC_7cAsl  
            Print Chr(9) & curFile  3Ee8_(E\  
        Next /rMxl(wD'  
    \=n0@1Q=>  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. aJh=4j~.  
        Dim nameArray() As String, sampName As String *Nfn6lVB  
        nameArray = Split(fList(0)," 0-0.txt") _PTo !aJL  
        sampName  = nameArray(0) b1X.#pz7F  
        Print "" .-kqt^Gc  
        Print "Sample name: " & Chr(9) & sampName $#Mew:J  
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        'Open an output file and write the FRED header data  $^&SEz  
        Dim outFile As String Znl&.,c)  
        outFile = cDir & sampName & "_FRED.txt" &uLxA w  
        Open outFile For Output As #1 /t "p^9!^  
        Print #1, "type bsdf_data" 6 yIl)5/=  
        Print #1, "format angles=deg bsdf=value scale=1" *~p~IX{  
    !83x,*O  
        'Loop the file list, skip the two header lines and write the remaining data to file ?(8z O"  
        Dim lineArray() As String, curLine As Long >z=_V|^$  
        For Each curFile In fList `i{k^Q  
            Print "Merging data from file " & curFile d<*4)MRN  
            ReadFile( cDir & curFile, lineArray ) ,H{ /@|RW  
            For curLine = 2 To UBound(lineArray) c[=%v]j:u  
                Print #1, lineArray(curLine) Bjg 21bw^  
            Next mtfyhFk  
        Next Sr7+DCr  
    [V#"7O vl  
        'Close the output file OtopA)  
        Close #1 9JF*xXd>Q  
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        Print "Finished merging RPC data for sample " & sampName ] o!#]]   
        Print "FRED formatted data file: " & Chr(9) & outFile wu*WA;FnA  
    End Sub 3t(8uG<rL  
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    'Utility function to read the contents of a file into an array of strings. eO,  
    Function ReadFile(ByVal fileName As String, _ gbc^Lb  
                      ByRef lineArray() As String) As Long ?FRR";  
    ;qI5GQ {  
        ReadFile = -1 &}Y_EHj}  
        Dim oFSO As Object 7R\!'`]\M  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 1SBc:!2  
        Erase lineArray 9Ao0$|@b  
    =goZI67  
        Dim fid As Long fgxsC7P$  
        If oFSO.fileexists( fileName ) Then 0XlX7Sk+  
            fid = FreeFile() ,5\:\e0H  
            Open fileName For Input As fid ;F&wGe  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ~L(_q]  
            Close fid oH+UuP2a-J  
        End If ?o0#h  
        Set oFSO = Nothing ` w Sg/  
        Return UBound( lineArray ) {d$S~  
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    End Function 1A23G$D  
    (.,E6H|zI  
    Sub GetFileList( ByVal in_dir As String, _ \Rn.ug  
                     ByRef in_flist() As String ) PF.sM(  
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        'Redimension the file list array ^ v3+w"2  
        Erase in_flist ]P0DPea  
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        'Tracks how many files are found /x_C  
        Dim fCount As Long .<Z7 K @  
        fCount = 0 ?xf59mY7  
    | -Di/.  
        'Recurse directory and search for text files }wR)p  
        Dim f As String v\Y;)/!  
        f = Dir$(in_dir & "*.txt") Pi?*rr5WZ  
        While f <> "" =nnS X-x  
            ReDim Preserve in_flist(fCount) 6,G^iv6H  
            in_flist(fCount) = f 7>{edNy!,  
            fCount += 1 OxF\Hm)(  
            f = Dir$() )ymF: ]QC  
        Wend eEsEW<su  
        ReDim Preserve in_flist(fCount-1) HkvCQH  
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    End Sub if5Y!Tx?G  
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    QQ:2987619807 17D167\X  
     
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