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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 3="vOSJ6&  
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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 45< gO1  
    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。 8f)pf$v`   
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 7^M$u\a)U  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 :)B1|1  
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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。 =ONM#DxH  
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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) {r|RH"|?Z(  
    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 w,R6:*p5  
    例如下所示: Ik5V?  
    Sample name:  EDF-C1-56 !T ,=kh  
    Merging data from file EDF-C1-56 0-0.txt _:5t~29  
    Finished merging RPC data for sample EDF-C1-56 J9j @V4  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q2woCx B  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 J>;r(j  
    a. 创建一个新的散射库 ~Jw84U{$  
    b. 散射模型命名 Pw7uxN`  
    c. 改变散射模型为“Tabulated BSDF”. ;YMg 4Cs  
    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 ) 8==M{M/eM  
    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。 >py[g0J  
    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 k2,`W2] ^E  
    g. 点击OK H`URJ8k$Q  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 VGxab;#,:3  
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    脚本代码 YPY,g R  
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    '#Language "WWB-COM" RF'nwzM3  
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    Option Explicit l;R8"L:,p\  
    " Qyi/r41  
    Sub Main `jTB9A"  
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        'Cleanup |r)QkxdU,  
        ClearOutputWindow()  6Bcr.`  
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        Print "Merging RPC Photonics BSDF Data Files" Ej6ho0_  
        SetTextColor(255,0,0) P2C>IS  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." S+wT}_BQ  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." _JTK$ \  
        SetTextColor(0,0,0) E.ji;5  
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        'Current directory of this script (should be the same as the text files being merged) 1=,2i)  
        Dim cDir As String Hy,""Py  
        cDir = MacroDir$ & "\" vZ57 S13  
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        'Array which will be populated with the list of files to be merged ;~d$O M  
        Dim fList() As String, curFile As String @H~oOf  
        GetFileList( cDir, fList ) =2NrmwWZs  
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        Print "" .oTS7rYw  
        Print "Files found for merging:" ^EkxZ4*g  
        For Each curFile In fList .8%b;b  
            Print Chr(9) & curFile S&XlMu  
        Next mT UoFXX[  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement.  &.s.g\  
        Dim nameArray() As String, sampName As String r7R.dD /.  
        nameArray = Split(fList(0)," 0-0.txt") -KfK~P3PF  
        sampName  = nameArray(0) c?}G;$  
        Print "" XOI"BLd  
        Print "Sample name: " & Chr(9) & sampName U:3O E97  
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        'Open an output file and write the FRED header data S ~fz  
        Dim outFile As String fc<y(uX  
        outFile = cDir & sampName & "_FRED.txt" FkuD Gg~a  
        Open outFile For Output As #1 CxJ3u  
        Print #1, "type bsdf_data" lA1  
        Print #1, "format angles=deg bsdf=value scale=1" d6JW"  
    / j%~#@  
        'Loop the file list, skip the two header lines and write the remaining data to file ,c?( |tF  
        Dim lineArray() As String, curLine As Long aBG^Xhx  
        For Each curFile In fList w%X@os}E  
            Print "Merging data from file " & curFile tK/,U =+  
            ReadFile( cDir & curFile, lineArray ) (S+/e5c)  
            For curLine = 2 To UBound(lineArray) Mlo,F1'?>  
                Print #1, lineArray(curLine) YwF&-~mp7n  
            Next $0 vT_  
        Next oD\t4]?E  
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        'Close the output file pmWy:0R  
        Close #1 gCiM\Qx  
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        Print "Finished merging RPC data for sample " & sampName [+R_3'aK  
        Print "FRED formatted data file: " & Chr(9) & outFile qhcx\eD:?  
    End Sub G/(,,T}eG  
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    'Utility function to read the contents of a file into an array of strings. "M[&4'OM  
    Function ReadFile(ByVal fileName As String, _ GQhy4ji'z  
                      ByRef lineArray() As String) As Long _xm<zy{`S  
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        ReadFile = -1 _ A# lyp  
        Dim oFSO As Object 6S_mfWsi  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Sa[lYMuB  
        Erase lineArray ' v CMf  
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        Dim fid As Long NQZ /E )f  
        If oFSO.fileexists( fileName ) Then u%yYLpaKf  
            fid = FreeFile() Eri007?D  
            Open fileName For Input As fid P!IA;i  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) K\fD';  
            Close fid jN*wbqL  
        End If jXALL8[c  
        Set oFSO = Nothing -qaO$M^Q  
        Return UBound( lineArray ) ]cS(2hP7  
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    End Function ji\LC%U-  
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    Sub GetFileList( ByVal in_dir As String, _ H? Q--pG8  
                     ByRef in_flist() As String ) #5{xWMp/0  
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        'Redimension the file list array phf{b+'#X  
        Erase in_flist 0|j44e }  
    W'"?5} (  
        'Tracks how many files are found N '&>bO?@`  
        Dim fCount As Long YsVKdh  
        fCount = 0 Xxd D)I  
    '<<@@.(f  
        'Recurse directory and search for text files B; NK\5>  
        Dim f As String [f  lK  
        f = Dir$(in_dir & "*.txt") G/},lUzLg  
        While f <> "" F {L#  
            ReDim Preserve in_flist(fCount) Q(yg bT  
            in_flist(fCount) = f er-0i L@  
            fCount += 1 @ %L  
            f = Dir$() :{Z%dD  
        Wend HpIi-Es7C  
        ReDim Preserve in_flist(fCount-1) 9e>2kd  
    /<$|tp\Rc  
    End Sub w42{)S"  
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