切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 891阅读
    • 0回复

    [技术]RPC Photonics扩散片BSDF [复制链接]

    上一主题 下一主题
    离线infotek
     
    发帖
    6421
    光币
    26250
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 &xExyz~`  
    BFt> 9x]T  
    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。
    ` G kX  
    NCD04U5y  
    背景 f?)-}\[IR{  
    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。 J9 I:Q<;  
    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。 UGatWj  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    3iU=c&P  
    U%/+B]6jP  
     f)<6  
    步骤 CNx8] _2  
    &,)&%Sg[  
    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。 onV>.7sG  
    (QiAisE  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    51.%;aY~z  
    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) YHl;flv  
    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 bs1Rvx1:J%  
    例如下所示: q0 \6F^;M  
    Sample name:  EDF-C1-56 @KUWxFak  
    Merging data from file EDF-C1-56 0-0.txt ABYcH]m  
    Finished merging RPC data for sample EDF-C1-56 OB}Ib]  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt EEL,^3KR  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 m) D|l1AtF  
    a. 创建一个新的散射库 wS3'?PRX  
    b. 散射模型命名 D3K8F@d  
    c. 改变散射模型为“Tabulated BSDF”. r@,2E6xn  
    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 ) >KKMcTOYY  
    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。 JjS?  
    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 |gY^)9ei  
    g. 点击OK E<*xx#p  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 J?$,c4;W2  
    n._-! WI  
    _Bj":rzY  
    脚本代码 |vzl. ^"-  
    ^d73Ig:8q  
    '#Language "WWB-COM" pmYHUj #  
    rU(+T0t?I  
    Option Explicit uXl3k:_n  
    f|oh.z_R  
    Sub Main h zn6kbv  
    p{dj~ &v  
        'Cleanup GsM<2@?  
        ClearOutputWindow() caX< n>  
    1yY0dOoLG)  
        Print "Merging RPC Photonics BSDF Data Files" @9|hMo  
        SetTextColor(255,0,0) T&7qC=E#5  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." E&:,oG2M  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." o3}3p]S\  
        SetTextColor(0,0,0) % %UE+u @J  
    q- d:TMkc  
        'Current directory of this script (should be the same as the text files being merged) IEvdV6{K  
        Dim cDir As String bi;1s'Y<D  
        cDir = MacroDir$ & "\" "tpSg  
    L9#g)tf 8T  
        'Array which will be populated with the list of files to be merged C+&l< fM&  
        Dim fList() As String, curFile As String B4 }bVjs  
        GetFileList( cDir, fList ) "@8li^  
    18:%~>.!  
        Print "" lU8Hd|@-  
        Print "Files found for merging:" +m,yA mEEd  
        For Each curFile In fList )@bQu~Y  
            Print Chr(9) & curFile ,UE83j8D^  
        Next @pU)_d!pJ  
    \Y}8S/]  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ^5 Tqy(M  
        Dim nameArray() As String, sampName As String d m%8K6|  
        nameArray = Split(fList(0)," 0-0.txt") <1M-Ro?5k  
        sampName  = nameArray(0) Ozf@6\/t  
        Print "" ;gr9/Vl  
        Print "Sample name: " & Chr(9) & sampName r" ,GC]  
    qJUK_6|3  
        'Open an output file and write the FRED header data @U}1EC{A  
        Dim outFile As String Pk)1WK7E  
        outFile = cDir & sampName & "_FRED.txt" GWip-wI  
        Open outFile For Output As #1 u\JNr}bL  
        Print #1, "type bsdf_data" 4H]L~^CD  
        Print #1, "format angles=deg bsdf=value scale=1" uM6+?A9@l  
    m`r(p"  
        'Loop the file list, skip the two header lines and write the remaining data to file t\ewHZG"  
        Dim lineArray() As String, curLine As Long jo@J}`\Zt  
        For Each curFile In fList N ZSSg2TX#  
            Print "Merging data from file " & curFile du^J2m{f  
            ReadFile( cDir & curFile, lineArray ) uu687|Pm  
            For curLine = 2 To UBound(lineArray) 45>?o  
                Print #1, lineArray(curLine) <2qr}K{'A  
            Next |ZBI *  
        Next lHX72s|V  
    i~J'%a<Qp  
        'Close the output file Q]>.b%s[  
        Close #1 N]sAji*  
    A3@6N(  
        Print "Finished merging RPC data for sample " & sampName czd~8WgOa  
        Print "FRED formatted data file: " & Chr(9) & outFile D}/vLw:v  
    End Sub um0N)&iY  
     0lR5<^B  
    'Utility function to read the contents of a file into an array of strings. ~qOa\#x_  
    Function ReadFile(ByVal fileName As String, _ [cp+i^f  
                      ByRef lineArray() As String) As Long L;I]OC^J  
    CeC6hGR5  
        ReadFile = -1 }`~+]9 <   
        Dim oFSO As Object 0"bcdG<}  
        Set oFSO = CreateObject("Scripting.FileSystemObject") @<&m|qtMsz  
        Erase lineArray %bfQ$a:  
    ~Jz6O U*z  
        Dim fid As Long N ?"]  
        If oFSO.fileexists( fileName ) Then w+CA1q<  
            fid = FreeFile() kW&TJP+5*  
            Open fileName For Input As fid +; AZ+w]ZF  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) :20W\P<O!A  
            Close fid Jg| XH L)  
        End If 0:Ol7  
        Set oFSO = Nothing )hfpwdQ  
        Return UBound( lineArray ) >\3V a  
    ZzT9j~  
    End Function p= } Nn(  
    @J`"[%U  
    Sub GetFileList( ByVal in_dir As String, _ ,nDaqQ-C!!  
                     ByRef in_flist() As String ) :Fvrs( x  
    SI-Ops~e  
        'Redimension the file list array >I&5j/&}+  
        Erase in_flist j  e P  
    !d0kV,F:  
        'Tracks how many files are found ;MdlwQ$`  
        Dim fCount As Long FQ5U$x. [P  
        fCount = 0 Z>5b;8  
    ~FG]wNgS  
        'Recurse directory and search for text files v z '&%(  
        Dim f As String [K0(RDV)%  
        f = Dir$(in_dir & "*.txt") cH t#us  
        While f <> "" wD'SPk5S?  
            ReDim Preserve in_flist(fCount) HCC#j9UN6  
            in_flist(fCount) = f 5C5sgR C  
            fCount += 1 ]-/VHh  
            f = Dir$() ckE-",G  
        Wend Dwfu.ZJa  
        ReDim Preserve in_flist(fCount-1) b!5~7Ub.No  
    b2&0Hx  
    End Sub dVT$VQg  
     
    分享到