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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 a'U7 t  
    rlk0t159  
    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 -;&aU;k  
    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。 oGx OJyD  
    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。 @G[P|^B  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 -hj@^Auf  
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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。 /2pf*\u  
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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) CwZ+P n0  
    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 /KjRB_5~q}  
    例如下所示: U1bhd}MoR  
    Sample name:  EDF-C1-56 azR<Y_tw  
    Merging data from file EDF-C1-56 0-0.txt P1)f-:;  
    Finished merging RPC data for sample EDF-C1-56 l_GvdD  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt RB.&,1  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 l|z 'Lwwm5  
    a. 创建一个新的散射库 x4fl=  
    b. 散射模型命名 8 P85qa@w  
    c. 改变散射模型为“Tabulated BSDF”. 90L,.  
    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 ) {Ak{ ct\t  
    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。 6I GUp  
    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 ?nJ7lLQA  
    g. 点击OK __r]@hY   
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 H((! BRl  
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    脚本代码 0yr=$F(]s  
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    '#Language "WWB-COM" gXN#<g,:^  
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    Option Explicit $~vy,^  
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    Sub Main .WM0x{t/  
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        'Cleanup s2A3.SN  
        ClearOutputWindow() B5h-JON]-  
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        Print "Merging RPC Photonics BSDF Data Files" Ci6yH( RE  
        SetTextColor(255,0,0) LW6&^S?4{  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." KD?~ hpg  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." iL(rZT&^  
        SetTextColor(0,0,0) 5Nc~cD%0tK  
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        'Current directory of this script (should be the same as the text files being merged) |d^r"wbs3  
        Dim cDir As String {Ts@#V=:  
        cDir = MacroDir$ & "\" ^]c/hb|X  
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        'Array which will be populated with the list of files to be merged U;Z6o1G  
        Dim fList() As String, curFile As String wLwAtjW)  
        GetFileList( cDir, fList ) Li~(kw3  
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        Print "" vw=OGjT_>m  
        Print "Files found for merging:" u4TU"r("A  
        For Each curFile In fList 9 2_F8y*D  
            Print Chr(9) & curFile amq]&.M  
        Next !Cxo4Twg  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ,ButNB v  
        Dim nameArray() As String, sampName As String {[WEA^C~Q  
        nameArray = Split(fList(0)," 0-0.txt") la#f,C3_  
        sampName  = nameArray(0) <,p|3p3  
        Print "" L4`bGZl55  
        Print "Sample name: " & Chr(9) & sampName -y]\;pbZ0  
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        'Open an output file and write the FRED header data N: 'v^0  
        Dim outFile As String `:cnu;  
        outFile = cDir & sampName & "_FRED.txt" p\I,P2on  
        Open outFile For Output As #1 #mg6F$E  
        Print #1, "type bsdf_data" x*td nor&  
        Print #1, "format angles=deg bsdf=value scale=1" tdSy&]P  
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        'Loop the file list, skip the two header lines and write the remaining data to file IJHNb_Cku  
        Dim lineArray() As String, curLine As Long lx*"Pj9hho  
        For Each curFile In fList 5=%:CN!/@p  
            Print "Merging data from file " & curFile !|6M,Rk_  
            ReadFile( cDir & curFile, lineArray ) G)5w_^&%  
            For curLine = 2 To UBound(lineArray) `|K30hRp:  
                Print #1, lineArray(curLine) O{Bll;C  
            Next ;okFm  
        Next *sK")Q4N  
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        'Close the output file !4-B xeNY\  
        Close #1 ^@?-YWt   
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        Print "Finished merging RPC data for sample " & sampName [kwVxaI  
        Print "FRED formatted data file: " & Chr(9) & outFile 'o=`1I  
    End Sub ]la8MaZ<  
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    'Utility function to read the contents of a file into an array of strings. gwE#,OY*  
    Function ReadFile(ByVal fileName As String, _ !G E-5\*  
                      ByRef lineArray() As String) As Long X,VOKj.%  
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        ReadFile = -1 |uo<<-\jTO  
        Dim oFSO As Object SXX6EIJr|  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 1SIhW:C  
        Erase lineArray j3{8]D  
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        Dim fid As Long S1oRMd)r  
        If oFSO.fileexists( fileName ) Then O=E"n*U  
            fid = FreeFile() 0>hV?A  
            Open fileName For Input As fid UjLZ!-}  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) +Hx$ABH  
            Close fid dqwCyYC  
        End If j2O?]M  
        Set oFSO = Nothing {2wfv2hQ  
        Return UBound( lineArray ) ^Wb|Pl  
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    End Function H9'Y` -r  
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    Sub GetFileList( ByVal in_dir As String, _ *s4h tt  
                     ByRef in_flist() As String ) 9pAklD4  
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        'Redimension the file list array !V|i\O|Q2  
        Erase in_flist UeNa  
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        'Tracks how many files are found 2<&lrsh  
        Dim fCount As Long lGHU{7j\  
        fCount = 0 -= {Z::}S"  
    ,>(/}=Z.  
        'Recurse directory and search for text files a1V+doC  
        Dim f As String .xJW=G{/  
        f = Dir$(in_dir & "*.txt") tXj28sh$  
        While f <> "" #$q~ZKB  
            ReDim Preserve in_flist(fCount) \hGo D  
            in_flist(fCount) = f EB8=*B8  
            fCount += 1 c_$9z>$  
            f = Dir$() . ] =$((  
        Wend  d+FS  
        ReDim Preserve in_flist(fCount-1) >E*j4gg  
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    End Sub ! 63>II  
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