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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 ;QQ7vo  
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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 mJ>99:W+  
    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。 Iq]6]  
    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。 BDRVT Y(s  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 u^$Md WP  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 _0q~s@-  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) TDE1z>h+"  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 >Mz|e(6  
    例如下所示: }!]x|zU.=  
    Sample name:  EDF-C1-56 )v{41sM+  
    Merging data from file EDF-C1-56 0-0.txt + 4g%?5'  
    Finished merging RPC data for sample EDF-C1-56 doO Ap9%  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt <`_OpNxqW  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 r&3o~!  
    a. 创建一个新的散射库 ~!-8l&C  
    b. 散射模型命名 w1#jVcUQ  
    c. 改变散射模型为“Tabulated BSDF”. fEG3b#t N  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Z)i1?#  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 u?3NBc$~A  
    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 pb6^sA%l  
    g. 点击OK `6N-MsP  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 e_k _ ty`  
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    脚本代码 EhPVK6@  
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    '#Language "WWB-COM" 7;}3{z  
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    Option Explicit ;#yu"6{  
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    Sub Main ?)[zLnxc&  
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        'Cleanup +:]Aqyc\  
        ClearOutputWindow() Dyk[u g5  
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        Print "Merging RPC Photonics BSDF Data Files" }\939Y  
        SetTextColor(255,0,0) hHc^ZA  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." &:;;u\  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." TG63  
        SetTextColor(0,0,0) a][pTC\rb  
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        'Current directory of this script (should be the same as the text files being merged) nKh%E-c  
        Dim cDir As String V4eng "  
        cDir = MacroDir$ & "\" j[/SXF\=  
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        'Array which will be populated with the list of files to be merged 8PoHBOxpc  
        Dim fList() As String, curFile As String hX8gV~E=y  
        GetFileList( cDir, fList ) ;o)=XEh8P  
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        Print "" HZDaV&)@  
        Print "Files found for merging:" 0Z A#T:4  
        For Each curFile In fList 6L8tz 8  
            Print Chr(9) & curFile >'ksXA4b  
        Next /NW>;J}C  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. A3MZxu=':3  
        Dim nameArray() As String, sampName As String ii_|)udz  
        nameArray = Split(fList(0)," 0-0.txt") jom} _  
        sampName  = nameArray(0) v LBee>$  
        Print "" &Mhv XHI  
        Print "Sample name: " & Chr(9) & sampName NMl ?Y uEv  
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        'Open an output file and write the FRED header data bB;~,W&E1  
        Dim outFile As String !dyxE'T2  
        outFile = cDir & sampName & "_FRED.txt" GJC!0{8;  
        Open outFile For Output As #1 T2 :oWjC3$  
        Print #1, "type bsdf_data" < QDr,Hj  
        Print #1, "format angles=deg bsdf=value scale=1" rL%]S&M9  
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        'Loop the file list, skip the two header lines and write the remaining data to file "ep`  
        Dim lineArray() As String, curLine As Long GUu\dl9WA'  
        For Each curFile In fList >'} Y1_S5  
            Print "Merging data from file " & curFile s- ,=e  
            ReadFile( cDir & curFile, lineArray ) 0'yG1qG  
            For curLine = 2 To UBound(lineArray) mUrS &&fu8  
                Print #1, lineArray(curLine) /nC{)s?S'  
            Next dThR)Z'=  
        Next 5JBB+g  
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        'Close the output file i?GfY C2q  
        Close #1 (s}Rj)V[^  
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        Print "Finished merging RPC data for sample " & sampName :DtZ8$I`]C  
        Print "FRED formatted data file: " & Chr(9) & outFile 6R1wn&8  
    End Sub .cg=  
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    'Utility function to read the contents of a file into an array of strings. .'t (-eT,  
    Function ReadFile(ByVal fileName As String, _ l|08  
                      ByRef lineArray() As String) As Long r{t. c?/  
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        ReadFile = -1 jo9J%vo  
        Dim oFSO As Object ?^%YRB&  
        Set oFSO = CreateObject("Scripting.FileSystemObject") pN\)(:"8v  
        Erase lineArray $}qDV> qo  
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        Dim fid As Long K#qoR/:  
        If oFSO.fileexists( fileName ) Then #4vV%S   
            fid = FreeFile() Op`I;Q #%d  
            Open fileName For Input As fid 3R5K}ZBi%  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ; cGv] A+  
            Close fid 0JmFQ ^g(  
        End If f{)+-8  
        Set oFSO = Nothing oM6j>&$b  
        Return UBound( lineArray ) oN *SRaAp  
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    End Function r5t;'eCe a  
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    Sub GetFileList( ByVal in_dir As String, _ a?5WKO  
                     ByRef in_flist() As String ) PT3>E5`Nu  
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        'Redimension the file list array /8f>':zUb  
        Erase in_flist 8';m)Jc  
    # v{Y=$L  
        'Tracks how many files are found :lUX5j3  
        Dim fCount As Long "yg.hK`  
        fCount = 0 IikG /8lP  
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        'Recurse directory and search for text files ?q\FLb%"7  
        Dim f As String 3^{8_^I  
        f = Dir$(in_dir & "*.txt") hT?6sWa  
        While f <> "" +T9Q_e*  
            ReDim Preserve in_flist(fCount) O`cdQu  
            in_flist(fCount) = f +`ai1-vw  
            fCount += 1 dVa!.q_3  
            f = Dir$() 8EOh0gk7  
        Wend >9ob*6q,  
        ReDim Preserve in_flist(fCount-1) TI}}1ScA'  
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    End Sub @&;(D!_&  
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