切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 928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 xCTPsw]s  
    .91@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。
    rGDx9KR4K!  
    L ^E#"f  
    背景 R\T1R"1  
    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。 7ciSIJ  
    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。 E3vYVuw  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    _TbQjE&6  
    p[^a4E_v  
    ]I^b&N  
    步骤 `uh+d  
    oE.59dx  
    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。 yQz6K6p  
    `k;MGs)&  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    Kj{(jT  
    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) p!Xn iY  
    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 *}h#'+  
    例如下所示: V1-URC24vd  
    Sample name:  EDF-C1-56 ,L&d\M"f  
    Merging data from file EDF-C1-56 0-0.txt S.,5vI"s,  
    Finished merging RPC data for sample EDF-C1-56 om oD +  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt .+ d.~jHX  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ]#sF pWI[N  
    a. 创建一个新的散射库 nRHxbE}::  
    b. 散射模型命名 =pk5'hBAi  
    c. 改变散射模型为“Tabulated BSDF”. +5i~}Q!  
    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 ) rNN ,!  
    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。 f`vu+nw  
    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 n@te.,?A"  
    g. 点击OK T B(K&3_D  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 `i5\(cdl  
      -]. a0  
    $<da<}b  
    脚本代码 KD* xFap  
    L/c`t7  
    '#Language "WWB-COM" HD_ #-M  
    HT%'dZ1  
    Option Explicit csjCXT=Ve  
    3j7Na#<tL3  
    Sub Main <8iu:nR  
    b!4Z~d0=  
        'Cleanup 6>NK2} `  
        ClearOutputWindow() K41Gn  
    K0fuN)C  
        Print "Merging RPC Photonics BSDF Data Files" 5"9 '=LV~  
        SetTextColor(255,0,0) N?s`a;Q[=  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." [/Sk+ID  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." -{z<+(K!$  
        SetTextColor(0,0,0) G0Y]-*1  
    ,<s/K  
        'Current directory of this script (should be the same as the text files being merged) ) #l&BV5  
        Dim cDir As String tjg?zlj  
        cDir = MacroDir$ & "\" M(U<H;Csk  
    LsxRK5   
        'Array which will be populated with the list of files to be merged QAzwNXE+  
        Dim fList() As String, curFile As String VOSq%hB  
        GetFileList( cDir, fList ) gvFs$X*^:  
    ]4onY >  
        Print "" -2B3 xIZJ  
        Print "Files found for merging:" S| |OSxZ  
        For Each curFile In fList /hSEm.<  
            Print Chr(9) & curFile Vji:,k=3\  
        Next aQ*?L l  
    |,Kk#`lW<f  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 5p]V/<r  
        Dim nameArray() As String, sampName As String Aa+<4 R  
        nameArray = Split(fList(0)," 0-0.txt") {BY(zsl  
        sampName  = nameArray(0)  r m  
        Print "" VDFs.;:s  
        Print "Sample name: " & Chr(9) & sampName <Rfx`mn  
    &3$FkU^F6  
        'Open an output file and write the FRED header data #.{ddY{  
        Dim outFile As String }R!t/ 8K  
        outFile = cDir & sampName & "_FRED.txt" ;(@' +"  
        Open outFile For Output As #1 Vg~10Q  
        Print #1, "type bsdf_data" gsY Q"/S9  
        Print #1, "format angles=deg bsdf=value scale=1" ye-[l7  
    "*LQr~k~}  
        'Loop the file list, skip the two header lines and write the remaining data to file \h/)un5  
        Dim lineArray() As String, curLine As Long M%Zh{  
        For Each curFile In fList >dJ[1s]  
            Print "Merging data from file " & curFile wGw<z[:f  
            ReadFile( cDir & curFile, lineArray ) L{0\M`B-  
            For curLine = 2 To UBound(lineArray) 22/"0=2g  
                Print #1, lineArray(curLine) .@0@Y  
            Next T"3:dkQw  
        Next 'cqY-64CJZ  
    26}fB  
        'Close the output file >d(:XP6J  
        Close #1 sI6I5  
    g:s|D hE[  
        Print "Finished merging RPC data for sample " & sampName J1w,;T\55  
        Print "FRED formatted data file: " & Chr(9) & outFile Dy*K;e-+  
    End Sub 2UG>(R:  
    d;nk>6<|  
    'Utility function to read the contents of a file into an array of strings. L d{`k  
    Function ReadFile(ByVal fileName As String, _ `CRF E5  
                      ByRef lineArray() As String) As Long [A'e7Do%'  
    WRrg5&._q  
        ReadFile = -1 Lvrflx*Q  
        Dim oFSO As Object hka%!W5  
        Set oFSO = CreateObject("Scripting.FileSystemObject") vVZ+u4y  
        Erase lineArray 5me#/NqLHY  
    :31?Z(fQ  
        Dim fid As Long 55ft ,a  
        If oFSO.fileexists( fileName ) Then N cp   
            fid = FreeFile() <'48mip  
            Open fileName For Input As fid klMpiy  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) D!8v$(#hR  
            Close fid l.(|&U~  
        End If a'g&1N0Rc  
        Set oFSO = Nothing shEAr*u  
        Return UBound( lineArray ) T7|=`~  
    Cj=_WWo  
    End Function FOhq&\nkU  
    dsOt(yNo  
    Sub GetFileList( ByVal in_dir As String, _ %)Z,?DzZ  
                     ByRef in_flist() As String ) +R7pdi  
    Q!r&vQ/g  
        'Redimension the file list array [{>3"XJ'  
        Erase in_flist KAi_+/]K_  
    @yj~5Gf(j  
        'Tracks how many files are found gtIEpYN+  
        Dim fCount As Long 5LZs_%#  
        fCount = 0 E.*gKfL  
    $3g M P+  
        'Recurse directory and search for text files "YAnGGx)LZ  
        Dim f As String ?M^qSo=/~  
        f = Dir$(in_dir & "*.txt") fCZ"0P3(  
        While f <> "" EnmMFxu<  
            ReDim Preserve in_flist(fCount) h/2@4XKj  
            in_flist(fCount) = f =:t<!dp  
            fCount += 1 fQ1Dp  
            f = Dir$() W*?qOq {  
        Wend A H=%6oT2  
        ReDim Preserve in_flist(fCount-1) m2&Vm~Py6b  
    hUX8j9N>  
    End Sub C$$Zwgy  
     
    分享到