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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 CK0l9#g  
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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 ^"9* 'vTtc  
    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。 UUeB;'E+  
    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。 OR:[J5M)  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 (luKn&826  
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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。 "X04mQn15  
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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) <_Eg?ePW#  
    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 DVlJ*A  
    例如下所示: I9Eu',  
    Sample name:  EDF-C1-56 ;#1Iiuh  
    Merging data from file EDF-C1-56 0-0.txt x&Cp> +i  
    Finished merging RPC data for sample EDF-C1-56 N2ied^* 0  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt d,0 }VaY=D  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Zp&@h-%YoD  
    a. 创建一个新的散射库 (gwj)?:  
    b. 散射模型命名 WA6!+Gy  
    c. 改变散射模型为“Tabulated BSDF”. #]E(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 ) ";x+1R.d  
    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。 v .=/Y(J  
    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 uLQ  
    g. 点击OK } fZ`IOf  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 -oyO+1V  
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    脚本代码 D)Q)NI  
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    '#Language "WWB-COM" "5Uh< X  
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    Option Explicit ;@3FF  
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    Sub Main qQ0C?  
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        'Cleanup .fYZ*=P;c  
        ClearOutputWindow() ?F7o!B  
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        Print "Merging RPC Photonics BSDF Data Files" MFt*&%,JX  
        SetTextColor(255,0,0) .]x2K-Sf  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." -|S]oJy  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." LD>\#q8a*  
        SetTextColor(0,0,0) ;eL9{eF  
    )IL #>2n?  
        'Current directory of this script (should be the same as the text files being merged) B@y(.  
        Dim cDir As String p\p\q(S">  
        cDir = MacroDir$ & "\" F {+`uG  
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        'Array which will be populated with the list of files to be merged ;CHi\+` 5  
        Dim fList() As String, curFile As String 'heJ"k?  
        GetFileList( cDir, fList ) ] )DX%$f  
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        Print "" N K]B?  
        Print "Files found for merging:" ccFn.($p?,  
        For Each curFile In fList 7nU6k%_%  
            Print Chr(9) & curFile l_rn++  
        Next h#r^teui)  
    & fC!(Oy  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. .@q-B+Eg  
        Dim nameArray() As String, sampName As String b5G}3)'w  
        nameArray = Split(fList(0)," 0-0.txt") !y:%0{l  
        sampName  = nameArray(0) OZY,@c  
        Print "" 'XrRhF (  
        Print "Sample name: " & Chr(9) & sampName N6OMY P1  
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        'Open an output file and write the FRED header data {c?JuV4q?  
        Dim outFile As String Ny- [9S-<  
        outFile = cDir & sampName & "_FRED.txt" !$;a[Te  
        Open outFile For Output As #1 I04jjr:<  
        Print #1, "type bsdf_data" RyJ 1mAC  
        Print #1, "format angles=deg bsdf=value scale=1" -t2T(ha  
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        'Loop the file list, skip the two header lines and write the remaining data to file iD38\XNMV  
        Dim lineArray() As String, curLine As Long g>rp@M  
        For Each curFile In fList YTQt3=1ii  
            Print "Merging data from file " & curFile l>gI&1)%  
            ReadFile( cDir & curFile, lineArray ) LVJI_O{fH  
            For curLine = 2 To UBound(lineArray) f3j{VN  
                Print #1, lineArray(curLine) 9>zcBG8f  
            Next 1=sXdcy;  
        Next /M;#_+VK<  
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        'Close the output file !Z!g:II /  
        Close #1 im} ?rY  
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        Print "Finished merging RPC data for sample " & sampName  VGHWNMT  
        Print "FRED formatted data file: " & Chr(9) & outFile =*qD4qYA  
    End Sub 8P7"&VYc8  
    ?"#%SKm  
    'Utility function to read the contents of a file into an array of strings. u] :m"L M  
    Function ReadFile(ByVal fileName As String, _ Hs?e0Z=N  
                      ByRef lineArray() As String) As Long (&|_quP7O  
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        ReadFile = -1 tWTKgbj(  
        Dim oFSO As Object FLg*R/  
        Set oFSO = CreateObject("Scripting.FileSystemObject") =deMd`=J  
        Erase lineArray l0&EZN0V2  
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        Dim fid As Long ?Xdak|?i  
        If oFSO.fileexists( fileName ) Then BqDKT  
            fid = FreeFile() 9a\nszwa  
            Open fileName For Input As fid Xs&TJ8a  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf)  [,n c  
            Close fid  ~ ~uAc_  
        End If >Vy>O &r  
        Set oFSO = Nothing b2 _Yu^  
        Return UBound( lineArray ) alh >"9~!  
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    End Function -9RDr\&`(  
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    Sub GetFileList( ByVal in_dir As String, _ )jWO P,|  
                     ByRef in_flist() As String ) 1O].v&{  
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        'Redimension the file list array 3nT Z)L }  
        Erase in_flist 43?^7_l-  
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        'Tracks how many files are found Pe C7  
        Dim fCount As Long !O\;Nua  
        fCount = 0 [E#UGJ@  
    [."[pY  
        'Recurse directory and search for text files 8WE{5#oi  
        Dim f As String %Qg+R26U  
        f = Dir$(in_dir & "*.txt") 5es[Ph|K5  
        While f <> "" :o:e,WKxb  
            ReDim Preserve in_flist(fCount) nJPyM/p  
            in_flist(fCount) = f 1qV@qz  
            fCount += 1 H|cNH=  
            f = Dir$() >!_Xgw  
        Wend 1n%?@+W  
        ReDim Preserve in_flist(fCount-1) 1B),A~Ip  
    ;8!Z5H  
    End Sub eh,~^x5  
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