切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 2205阅读
    • 0回复

    [分享]RPC Photonics扩散片BSDF [复制链接]

    上一主题 下一主题
    离线infotek
     
    发帖
    7056
    光币
    29425
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 xC)bW,%  
    '<Zm>L&  
    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。
    n>'(d*[e&  
    h@%Xy(/m'  
    背景 s#X/ F  
    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。 d/d)MoaJ*t  
    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。 0*{(R#  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    \J^#2{d  
    :c*"Dx'D  
    {)" 3  
    步骤 SzW;Yb"#^k  
    |*bUcS<S  
    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。 7H Har'=T  
    u^2`$W  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    3ahriZe  
    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) #NM)  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 a#p+.)Wm  
    例如下所示: Fd9[Pe@?`  
    Sample name:  EDF-C1-56 /v!yI$xc  
    Merging data from file EDF-C1-56 0-0.txt Pe%[d[ k  
    Finished merging RPC data for sample EDF-C1-56 ~5HkDtI)  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt JQQyl:=  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 w.m8SvS&b  
    a. 创建一个新的散射库 ^Om}9rXw1  
    b. 散射模型命名 Zl>SeTjB-  
    c. 改变散射模型为“Tabulated BSDF”. N3G9o`k  
    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 ) _U~R   
    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。 <9@n/  
    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 SEgw!2H  
    g. 点击OK m212 gc0u  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 8Ths"zwn  
    KsULQJ#,  
    /zIG5RK>  
    脚本代码 mEY#QN[eq  
    "VaWZ*  
    '#Language "WWB-COM" !9d7wPUFr  
    J*B-*6O44  
    Option Explicit S`-I-VS=L  
    O,%UNjx9K  
    Sub Main uaIAVBRcS  
     +/B  
        'Cleanup v H HgZ  
        ClearOutputWindow() /?8 1Ypt  
    k0Vri$x  
        Print "Merging RPC Photonics BSDF Data Files" xw*e`9vAe  
        SetTextColor(255,0,0) @<W` w  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." e:G~P u`  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." DAw1S$dM  
        SetTextColor(0,0,0) W|< c[S  
    +^7cS6"L  
        'Current directory of this script (should be the same as the text files being merged) UBd+,]"f  
        Dim cDir As String Y}[<KK}_  
        cDir = MacroDir$ & "\" !8 @yi"n  
    zgjg#|  
        'Array which will be populated with the list of files to be merged jIKg* @  
        Dim fList() As String, curFile As String i#:To |\u  
        GetFileList( cDir, fList ) "leSQ  
    QQAEG#.5  
        Print "" \S h/<z  
        Print "Files found for merging:" ,i_+Z |Ls  
        For Each curFile In fList "kApGNB  
            Print Chr(9) & curFile {C w.?JU  
        Next S257+ K9  
    ~gX1n9_n  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. g1t6XVS$9  
        Dim nameArray() As String, sampName As String 0H_Ai=G  
        nameArray = Split(fList(0)," 0-0.txt") #IH9S5B [  
        sampName  = nameArray(0) *(x.egORd  
        Print "" SGKAx<U  
        Print "Sample name: " & Chr(9) & sampName Oti;wf G7o  
    c =m#MMc)  
        'Open an output file and write the FRED header data ?;tPqOs&  
        Dim outFile As String &A s>Y,y  
        outFile = cDir & sampName & "_FRED.txt" (^yaAy#4  
        Open outFile For Output As #1 _`gF%$]b  
        Print #1, "type bsdf_data"  ]]p\1G  
        Print #1, "format angles=deg bsdf=value scale=1" % Z6Q/+#fn  
    Mnranhe>G  
        'Loop the file list, skip the two header lines and write the remaining data to file ,Ee5}#dI  
        Dim lineArray() As String, curLine As Long i&DbZ=n2  
        For Each curFile In fList inW7t2p<s  
            Print "Merging data from file " & curFile +c8`N'~  
            ReadFile( cDir & curFile, lineArray ) 7#JnQ| ]  
            For curLine = 2 To UBound(lineArray) NLZ5 5yo$  
                Print #1, lineArray(curLine) IYn`&jS{  
            Next q%,86A>  
        Next .5 E)dU  
    ]{=y8]7  
        'Close the output file XU7to]'K  
        Close #1 iZTU]+z!  
    /J^dz vH  
        Print "Finished merging RPC data for sample " & sampName <HnJD/g  
        Print "FRED formatted data file: " & Chr(9) & outFile {)Wf[2zJ  
    End Sub |2'WSAWG  
    ,|c;x1|O  
    'Utility function to read the contents of a file into an array of strings. B-g uz  
    Function ReadFile(ByVal fileName As String, _ SB%D%Zx6'%  
                      ByRef lineArray() As String) As Long Sk EI51]  
    gI7*zR4D  
        ReadFile = -1 cPcH 8Vd  
        Dim oFSO As Object aUL7 ]'q}  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 8`S1E0s  
        Erase lineArray Ep-bx&w+  
    p+g=Z<?`  
        Dim fid As Long #j7&2L  
        If oFSO.fileexists( fileName ) Then L%H\|>k`  
            fid = FreeFile() 4!14: mq  
            Open fileName For Input As fid cKYvNM  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) =9TwBr.CJ  
            Close fid ?"'+tZ=f6  
        End If '-myOM7  
        Set oFSO = Nothing T=/c0#Q|q  
        Return UBound( lineArray ) >}wFePl  
    n U=  
    End Function BqJ|l7+  
    OM.-apzC  
    Sub GetFileList( ByVal in_dir As String, _ T}J)n5U}\  
                     ByRef in_flist() As String ) =m<b+@?T  
    EkV#i  
        'Redimension the file list array gIO_mJ3 u  
        Erase in_flist Dlz0*eHD  
    8nZ_.  
        'Tracks how many files are found (<B%Gy@  
        Dim fCount As Long B _ J2Bf  
        fCount = 0 m>Z3p7!N}  
    0vEQgx>  
        'Recurse directory and search for text files &@xm< A\S  
        Dim f As String #[i3cn  
        f = Dir$(in_dir & "*.txt") &W3srJo  
        While f <> "" !]?kvf-3e  
            ReDim Preserve in_flist(fCount) '-(Z.e~e  
            in_flist(fCount) = f v~x`a0  
            fCount += 1 #-b}QhxH  
            f = Dir$() S['rTuk  
        Wend 3 }sy{Mx%9  
        ReDim Preserve in_flist(fCount-1) cY+fZ=  
    w15a~\Qu  
    End Sub VN09g&  
    yOD=Vc7i  
    C/ VHzV%q  
    QQ:2987619807 e{5O>RO  
     
    分享到