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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 CrTGC%w{=  
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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 sKIpL(_I$  
    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。 /:<.Cn>-  
    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。 1@i 8ASL  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 o3s ME2  
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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。 0EA<ip  
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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) MO1t 0Myc  
    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 7aV(tMzd  
    例如下所示: BLno/JK0}  
    Sample name:  EDF-C1-56 .b3c n  
    Merging data from file EDF-C1-56 0-0.txt e>GX]tK  
    Finished merging RPC data for sample EDF-C1-56 dx<KZR$!V  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt )q+Qtz6D  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 SL j2/B0  
    a. 创建一个新的散射库  Z>O2  
    b. 散射模型命名 F74^HQ*J  
    c. 改变散射模型为“Tabulated BSDF”. `.0WK  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) SccaX P  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 s}O9[_v  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 b }^ylm  
    g. 点击OK qMHI-h_A  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 IM^K]$q$47  
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    脚本代码 LKEf#mp  
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    '#Language "WWB-COM" ;q3"XLV(T[  
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    Option Explicit KA"D2j9wn  
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    Sub Main +O2z&a;q  
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        'Cleanup ,[Bv\4Ah  
        ClearOutputWindow() a$~pAy5C  
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        Print "Merging RPC Photonics BSDF Data Files" &' 0|U{|  
        SetTextColor(255,0,0)  _xyq25/  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 3=)!9;uY  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." hm&cRehU  
        SetTextColor(0,0,0) ~0^d-,ZD5  
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        'Current directory of this script (should be the same as the text files being merged) N N1(f  
        Dim cDir As String :M |<c9I  
        cDir = MacroDir$ & "\" ;;3oWsil}  
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        'Array which will be populated with the list of files to be merged xv+47.?N  
        Dim fList() As String, curFile As String E&wz0d;gf  
        GetFileList( cDir, fList ) zS6oz=  
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        Print "" qkLp8/G>pO  
        Print "Files found for merging:" j~ 'a %P  
        For Each curFile In fList C.& R,$  
            Print Chr(9) & curFile 0+vt LDq@P  
        Next o~(/Twxam  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. #7Pnw.s3zz  
        Dim nameArray() As String, sampName As String -VO&#Mt5u  
        nameArray = Split(fList(0)," 0-0.txt") &azy1.i~  
        sampName  = nameArray(0) j&c YRKpz  
        Print "" 3G;#QK -c  
        Print "Sample name: " & Chr(9) & sampName |P>Yf0  
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        'Open an output file and write the FRED header data (sfy14>\  
        Dim outFile As String 9c}mAg4  
        outFile = cDir & sampName & "_FRED.txt" 5N_w(B  
        Open outFile For Output As #1 z"vI-~,YU  
        Print #1, "type bsdf_data" o-f;$]yp>  
        Print #1, "format angles=deg bsdf=value scale=1" kw gsf5[  
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        'Loop the file list, skip the two header lines and write the remaining data to file T"tR*2HwSd  
        Dim lineArray() As String, curLine As Long >p[skN   
        For Each curFile In fList }+F&=-P)  
            Print "Merging data from file " & curFile /4!.G#DLQ  
            ReadFile( cDir & curFile, lineArray ) ^tFbg+.  
            For curLine = 2 To UBound(lineArray) p /x ]  
                Print #1, lineArray(curLine) ]8c%)%Vi  
            Next I_k!'zR[N  
        Next Vp.&X 8  
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        'Close the output file 0<n*8t?A-  
        Close #1 PE\.JU  
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        Print "Finished merging RPC data for sample " & sampName DA(ur'D  
        Print "FRED formatted data file: " & Chr(9) & outFile v"K #  
    End Sub .C=I~Z  
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    'Utility function to read the contents of a file into an array of strings. xeGl}q|  
    Function ReadFile(ByVal fileName As String, _ : CR1Oy9  
                      ByRef lineArray() As String) As Long WA$Ug  
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        ReadFile = -1 {+SshT>J  
        Dim oFSO As Object B9[eLh!  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ayR;|S  
        Erase lineArray L#}HeOEi[  
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        Dim fid As Long w~n7l97Pw  
        If oFSO.fileexists( fileName ) Then ] C&AU[U*  
            fid = FreeFile() 6iZ:0y0t+6  
            Open fileName For Input As fid t'.oty=  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) {=q$k=ib  
            Close fid nB+UxU@  
        End If -<jd/ 5  
        Set oFSO = Nothing ~dm/U7B:  
        Return UBound( lineArray ) uHNh|ew21  
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    End Function ,o{|W9  
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    Sub GetFileList( ByVal in_dir As String, _ r@.3.Q  
                     ByRef in_flist() As String ) | WN9&  
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        'Redimension the file list array B/n/bi8T  
        Erase in_flist {Iu9%uR>@  
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        'Tracks how many files are found L( B(x>w  
        Dim fCount As Long iax6o+OG|  
        fCount = 0 YM(` E9{h  
    ,];4+&|8kW  
        'Recurse directory and search for text files ,;)1|-^nu  
        Dim f As String `Qrrnq  
        f = Dir$(in_dir & "*.txt") G=Qslrtg  
        While f <> ""  -l ?J  
            ReDim Preserve in_flist(fCount) `~.0PnHf  
            in_flist(fCount) = f TX%W-J _  
            fCount += 1 [:MpOl-KIz  
            f = Dir$() fK'qc L  
        Wend eT4+O5t  
        ReDim Preserve in_flist(fCount-1) {Yp;R  
    |}O9'fyU8  
    End Sub MUs~ZF  
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