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    [技术]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: 2023-05-11
    摘要 XYj!nx{k,  
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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 @cRR  
    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。 69N/_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。 RUco3fZ   
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 : 8h\x  
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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。 QP>tu1B|  
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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) x$hhH=  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 Z uFk}R"x  
    例如下所示: X} {z7[  
    Sample name:  EDF-C1-56 X\4d|VJ?m  
    Merging data from file EDF-C1-56 0-0.txt w.X MyHj  
    Finished merging RPC data for sample EDF-C1-56 X(Z~oGyg  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt &X3G;x2;  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 RD6n1Wb(@  
    a. 创建一个新的散射库 G`D rY;  
    b. 散射模型命名 @I"&k!e<2  
    c. 改变散射模型为“Tabulated BSDF”. _nwsIjsW  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) G.")Bg  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 RW-) ({  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 {'#1do}{  
    g. 点击OK wE3L,yx=  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 P K+rr.k]  
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    脚本代码 JkShtLEr  
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    '#Language "WWB-COM" MpK3+4UMa  
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    Option Explicit 2x5^kN7  
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    Sub Main OI^??joQ  
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        'Cleanup b1TIVK3m  
        ClearOutputWindow() ;NMv>1fI  
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        Print "Merging RPC Photonics BSDF Data Files" 9\'JtZO  
        SetTextColor(255,0,0) mO=A50_&,Q  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." q@Aw]Kh  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." \E(^<Af  
        SetTextColor(0,0,0) TUBpRABH  
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        'Current directory of this script (should be the same as the text files being merged) ]z#+3DaH  
        Dim cDir As String CM%Rz-c  
        cDir = MacroDir$ & "\" 'Z*`~,Q  
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        'Array which will be populated with the list of files to be merged #My14u  
        Dim fList() As String, curFile As String l"zA~W/  
        GetFileList( cDir, fList ) R 7h^ @  
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        Print "" jj&mRF0gCb  
        Print "Files found for merging:" bey:Qj??  
        For Each curFile In fList -aq3Lqi  
            Print Chr(9) & curFile skm~~JM^  
        Next W:maE9E=  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. $Ge0<6/  
        Dim nameArray() As String, sampName As String "XQ3mi`y  
        nameArray = Split(fList(0)," 0-0.txt") iE EP~  
        sampName  = nameArray(0) z]2MR2W@X  
        Print "" S{m:Iij[;  
        Print "Sample name: " & Chr(9) & sampName (|\%)v H-  
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        'Open an output file and write the FRED header data aUF{57,<  
        Dim outFile As String *sQ.y {  
        outFile = cDir & sampName & "_FRED.txt" cQkj{u  
        Open outFile For Output As #1 Mkh/+f4  
        Print #1, "type bsdf_data" `_k_}9Fr  
        Print #1, "format angles=deg bsdf=value scale=1" :7M%/#Fy  
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        'Loop the file list, skip the two header lines and write the remaining data to file j8oX9 Yo0=  
        Dim lineArray() As String, curLine As Long ~470LgpO1  
        For Each curFile In fList Hu9nJ  
            Print "Merging data from file " & curFile S{RRlR6Z  
            ReadFile( cDir & curFile, lineArray ) RBz"1hRo`  
            For curLine = 2 To UBound(lineArray) +DG-MM%\  
                Print #1, lineArray(curLine) 3:O|p[2)L  
            Next 25f[s.pv8  
        Next `$Um  
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        'Close the output file M]|]b-#  
        Close #1  ,)uW`7  
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        Print "Finished merging RPC data for sample " & sampName vz(=3C[  
        Print "FRED formatted data file: " & Chr(9) & outFile *8Su:=*b  
    End Sub .sc80i4  
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    'Utility function to read the contents of a file into an array of strings. nuDu  
    Function ReadFile(ByVal fileName As String, _ `ZZ3!$czR  
                      ByRef lineArray() As String) As Long _Ss}dU9  
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        ReadFile = -1 ALn_ifNh  
        Dim oFSO As Object 3dz{" hV  
        Set oFSO = CreateObject("Scripting.FileSystemObject") zB`J+r;LU  
        Erase lineArray :f:&B8  
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        Dim fid As Long rizjH+  
        If oFSO.fileexists( fileName ) Then yZ!~m3Q  
            fid = FreeFile() _k : BY  
            Open fileName For Input As fid $vK,Gugcx  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) xbxzB<yL  
            Close fid Y4w]jIv  
        End If }Ml BmD  
        Set oFSO = Nothing H "Io!{aKU  
        Return UBound( lineArray ) & kVa*O  
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    End Function IhBQ1,&J  
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    Sub GetFileList( ByVal in_dir As String, _ :ssj7wl :  
                     ByRef in_flist() As String ) $0x+b!_l@  
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        'Redimension the file list array R|^bZf^  
        Erase in_flist V;g) P  
    ).`v&-cK4E  
        'Tracks how many files are found *DvX|| `&  
        Dim fCount As Long ?(U;T!n  
        fCount = 0 =f H5 r_n  
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        'Recurse directory and search for text files $a8,C\m e?  
        Dim f As String GLESngAl  
        f = Dir$(in_dir & "*.txt") gG@4MXq.  
        While f <> "" [3sZ=)G  
            ReDim Preserve in_flist(fCount) 3=o4ncg(  
            in_flist(fCount) = f cHVJ7yAZI  
            fCount += 1 6;\1bP?  
            f = Dir$() /P-#y@I  
        Wend ES!e/l  
        ReDim Preserve in_flist(fCount-1) ]'?Ue7  
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    End Sub D"-Wo}"8O'  
     
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