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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    离线infotek
     
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    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 ''3b[<  
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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 G/y;o3/[Z  
    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。 Qf.]Mw?Bm  
    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。 ;JV(!8[  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 zn2Qp  
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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。 n1PV/ Z  
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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) xjH({(/B>a  
    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 MNu\=p\Eq  
    例如下所示: =l+~}/7'Z  
    Sample name:  EDF-C1-56 {jOV8SVL  
    Merging data from file EDF-C1-56 0-0.txt 2 i97  
    Finished merging RPC data for sample EDF-C1-56 "pTU&He  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt F/w*[Xi Sh  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 |}D5q| d@n  
    a. 创建一个新的散射库 ]CGH )4Pe  
    b. 散射模型命名  RI&V:1  
    c. 改变散射模型为“Tabulated BSDF”. S:{`eDk\A_  
    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 ) X-j3=8wPM  
    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。 ,lb >  
    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 /4{IxQk  
    g. 点击OK SmCtwcB1  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ykD-L^}  
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    脚本代码 Rg%Xy`gS  
    ES ?6  
    '#Language "WWB-COM" 3_N1y  
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    Option Explicit tKY g  
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    Sub Main V@pUU~6R  
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        'Cleanup NKMVp/66D  
        ClearOutputWindow() >9,:i)m_  
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        Print "Merging RPC Photonics BSDF Data Files" f6`W(OiE  
        SetTextColor(255,0,0) Sv t%*j  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." >/G[Oo  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." +c' n,O~3  
        SetTextColor(0,0,0) 9yWSlbPr]  
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        'Current directory of this script (should be the same as the text files being merged) cf%aOHYI*  
        Dim cDir As String ZDx1v_xr  
        cDir = MacroDir$ & "\" ?D['>Rzu  
    ZwM d 22  
        'Array which will be populated with the list of files to be merged fU|4^p)  
        Dim fList() As String, curFile As String S~U5xM^s  
        GetFileList( cDir, fList ) p<c1$O*  
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        Print "" CPcB17!  
        Print "Files found for merging:" m'WGK`WIm  
        For Each curFile In fList ce7 $# #f  
            Print Chr(9) & curFile 4@=[r Zb9  
        Next ?d_vD@+\  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. y=zs6HaS  
        Dim nameArray() As String, sampName As String Lw`}o`D  
        nameArray = Split(fList(0)," 0-0.txt") m@"p#pt(_  
        sampName  = nameArray(0) s){R/2O3F  
        Print "" F]cc?r312  
        Print "Sample name: " & Chr(9) & sampName BC R]K  
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        'Open an output file and write the FRED header data s8SCEpz  
        Dim outFile As String 7%W@Hr,%F  
        outFile = cDir & sampName & "_FRED.txt" Ct]? /  
        Open outFile For Output As #1 oI"gQFGu`u  
        Print #1, "type bsdf_data" @B9#Hrc  
        Print #1, "format angles=deg bsdf=value scale=1" YGhHIziI  
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        'Loop the file list, skip the two header lines and write the remaining data to file M7ug < 8i  
        Dim lineArray() As String, curLine As Long =z'533C  
        For Each curFile In fList i}@5<&J  
            Print "Merging data from file " & curFile lM.k *`$  
            ReadFile( cDir & curFile, lineArray ) +f,I$&d.V  
            For curLine = 2 To UBound(lineArray) H%;pPkIi  
                Print #1, lineArray(curLine) 1pT/`x  
            Next Tx(=4ALY  
        Next Tvw(S q};  
    Fl++rUT  
        'Close the output file Ca0t}`<S  
        Close #1 Y{L|ja%9?  
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        Print "Finished merging RPC data for sample " & sampName \>+BvF  
        Print "FRED formatted data file: " & Chr(9) & outFile r]&&*:  
    End Sub :s|xa u=  
    <9`/Y"\p  
    'Utility function to read the contents of a file into an array of strings. hcQv!!Q"k$  
    Function ReadFile(ByVal fileName As String, _ [Rzn>  
                      ByRef lineArray() As String) As Long /_r{7Gq.  
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        ReadFile = -1 r8!M8Sc  
        Dim oFSO As Object b<KKF'  
        Set oFSO = CreateObject("Scripting.FileSystemObject") #DcK{|ty  
        Erase lineArray T7Yg^ -"  
    4'XCO+i#  
        Dim fid As Long bM $WU?Z  
        If oFSO.fileexists( fileName ) Then RueL~$*6.~  
            fid = FreeFile() LY!.u?D`P  
            Open fileName For Input As fid O9F#gO|!  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf)  U66oe3W  
            Close fid \fL:Ie  
        End If ]BBjFs4#  
        Set oFSO = Nothing &qZ:"k  
        Return UBound( lineArray ) 8wA'a'V.  
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    End Function P4~C0z  
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    Sub GetFileList( ByVal in_dir As String, _ )"<:Md$7  
                     ByRef in_flist() As String ) (+0yZ7AZ  
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        'Redimension the file list array h:'wtn@l(  
        Erase in_flist pc<A ,?  
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        'Tracks how many files are found (Y]G6> Oa  
        Dim fCount As Long G7H'OB &  
        fCount = 0 ,Mw;kevw  
    +W9#^  
        'Recurse directory and search for text files Y/< ],1U  
        Dim f As String Oe}6jcb6&  
        f = Dir$(in_dir & "*.txt") %q 7gl;'  
        While f <> "" 4';(\42  
            ReDim Preserve in_flist(fCount) =qVD"Z]z  
            in_flist(fCount) = f %1VfTr5  
            fCount += 1 ;?0r,0l2$  
            f = Dir$() 0|_d{/VK4  
        Wend w"K;e(S  
        ReDim Preserve in_flist(fCount-1) . 'rC'FT  
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    End Sub " )_-L8  
     
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