切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 2131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
    6922
    光币
    28760
    光券
    0
    只看楼主 正序阅读 楼主  发表于: 2020-12-15
    摘要 "pOqd8>]  
    P a3{Ds  
    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。
    /g13X,.H  
    2XzF k_6H  
    背景 R_t~UTfI;  
    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。 H3!,d`D.N  
    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。 Um/CR!  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    _c[|@D  
    p 7 , f6kG  
    x6"/z  
    步骤 km9Gwg/zT  
    |Uc <;> l  
    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。 sq6>DuBZz  
    f#*h^91x  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    Tw2Xe S  
    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) dz{#"No0  
    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 pTc$+Z7 3  
    例如下所示: P;^y|0N m  
    Sample name:  EDF-C1-56 O 5g}2  
    Merging data from file EDF-C1-56 0-0.txt Xq+!eOT  
    Finished merging RPC data for sample EDF-C1-56 p^T&jE8])#  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt AEB/8%l};v  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ` 52% XI  
    a. 创建一个新的散射库 np<f,  
    b. 散射模型命名 rdXCWK$E  
    c. 改变散射模型为“Tabulated BSDF”. @<hF.4,]  
    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 ) kJHr&=VO~  
    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。 ,lrYl!,  
    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 ,Y`'myL8W  
    g. 点击OK 3 %z   
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 FgXu1-  
    Mi;}.K0J  
    /p[|DJo M  
    脚本代码 3?!G-  
    NYWG#4D  
    '#Language "WWB-COM" 6"BtfQ")  
    D=jS h  
    Option Explicit N!tpzHXw  
    L4MxU 2  
    Sub Main p>2||  
    |^YzFrc  
        'Cleanup qzuQq94k  
        ClearOutputWindow() *54>iO- c  
    F% F c+?  
        Print "Merging RPC Photonics BSDF Data Files" ~5lKL5w  
        SetTextColor(255,0,0) Yh}zt H  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." vF5wA-3&t  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." `4q5CJ2  
        SetTextColor(0,0,0) kWzuz#  
    ap Fs UsE  
        'Current directory of this script (should be the same as the text files being merged) yw;ghP;  
        Dim cDir As String '"!z$i~G=  
        cDir = MacroDir$ & "\" "6NFe!/Y$*  
    utYnaeQcn  
        'Array which will be populated with the list of files to be merged 4^ d+l.F  
        Dim fList() As String, curFile As String 1x~%Ydy  
        GetFileList( cDir, fList ) b:N^Fe  
    xi '72  
        Print "" l.__10{  
        Print "Files found for merging:" !!?+M @  
        For Each curFile In fList .`oJcJ  
            Print Chr(9) & curFile 'Qm` A=  
        Next T0@](g  
    /e-ka{WS  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 8>C; >v  
        Dim nameArray() As String, sampName As String />dB%*  
        nameArray = Split(fList(0)," 0-0.txt") kx"hWG4  
        sampName  = nameArray(0)  l 'AK  
        Print "" MgJ%26TZ  
        Print "Sample name: " & Chr(9) & sampName y3 ({(URU  
    ?aK'OIo  
        'Open an output file and write the FRED header data =]_d pEEQ  
        Dim outFile As String 6vD]@AF  
        outFile = cDir & sampName & "_FRED.txt" k| _$R?  
        Open outFile For Output As #1 Wrf^O2  
        Print #1, "type bsdf_data" Tf&f`/  
        Print #1, "format angles=deg bsdf=value scale=1" 5}.,"Fbr  
    p9FA_(`^  
        'Loop the file list, skip the two header lines and write the remaining data to file ^l]]qdNr  
        Dim lineArray() As String, curLine As Long -XS+Uv  
        For Each curFile In fList SR&(HH$  
            Print "Merging data from file " & curFile _H~pH7WU  
            ReadFile( cDir & curFile, lineArray ) @{J!6YGh  
            For curLine = 2 To UBound(lineArray) Hrd5p+j  
                Print #1, lineArray(curLine) d-6sC@PB  
            Next C?GvTc  
        Next B)j`}7O 06  
    [?|l X$<  
        'Close the output file tJ?qcT?  
        Close #1 2 pM  
    ?V&Ld$db  
        Print "Finished merging RPC data for sample " & sampName p6&LZ=tL3  
        Print "FRED formatted data file: " & Chr(9) & outFile o 1 hdO  
    End Sub i# pjv'C  
    p=8M0k  
    'Utility function to read the contents of a file into an array of strings. jQ.>2-;H9  
    Function ReadFile(ByVal fileName As String, _ )1ZJ  
                      ByRef lineArray() As String) As Long 5t"bCzp  
    &X#x9|=&O  
        ReadFile = -1 ;ZxK3/(7  
        Dim oFSO As Object (c|$+B^*  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ({d,oU$>y  
        Erase lineArray }$&T O$LX  
    fd!pM4"0  
        Dim fid As Long `@f hge  
        If oFSO.fileexists( fileName ) Then bl:a&<F  
            fid = FreeFile() |g7nh[  
            Open fileName For Input As fid 'mBLf&fB  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) M(.uu`B  
            Close fid N27K  
        End If E>l#0Zw  
        Set oFSO = Nothing ~_dBND?  
        Return UBound( lineArray ) Q>SPV8s   
    <eud#v  
    End Function :|3"H&FWK  
    M\Uc;:) H  
    Sub GetFileList( ByVal in_dir As String, _ }2iKi(io*  
                     ByRef in_flist() As String ) >0g `U  
    PK.h E{R  
        'Redimension the file list array {L-{Y<fke  
        Erase in_flist }6uV]V{  
    323yAF  
        'Tracks how many files are found ]Vf8mkDGO  
        Dim fCount As Long tKs4}vW  
        fCount = 0 fJF8/IQ4  
    @mQ/W Ys  
        'Recurse directory and search for text files wa(Wit"-  
        Dim f As String {jx#^n&5R  
        f = Dir$(in_dir & "*.txt") cdek^/  
        While f <> "" VuO)  
            ReDim Preserve in_flist(fCount) (04j4teE  
            in_flist(fCount) = f K d`l[56#  
            fCount += 1 ~u?x{[  
            f = Dir$() :uT fhr  
        Wend DMK"Q#Vw  
        ReDim Preserve in_flist(fCount-1) %~B)~|h  
    XDrlJvrPL  
    End Sub Yn[EI7D  
    `F- Dd4B  
    |$.sB|_ N  
    QQ:2987619807 xy z\;3  
     
    分享到