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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 yOU(2"8p  
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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 a]17qMl  
    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。 "Mw[P [w*  
    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。 Z%zj";C G  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 RcG0 8p.)  
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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。 {'sY|lou  
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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) zLs|tJOVp  
    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 +CH},@j  
    例如下所示: EKEjv|_)  
    Sample name:  EDF-C1-56 `+'rib5  
    Merging data from file EDF-C1-56 0-0.txt oBQ#eW aY  
    Finished merging RPC data for sample EDF-C1-56 h!~3Dw>,N  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt +y7;81ND  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 }VS3L_ ;}/  
    a. 创建一个新的散射库 uzmk6G v  
    b. 散射模型命名 ]xC#rwHUC  
    c. 改变散射模型为“Tabulated BSDF”. oVA?J%EK  
    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 ) <~}7Mxn%x@  
    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。 Q$& sTM  
    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 )[H{yQ  
    g. 点击OK MObt,[^W  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 rk+#GO{  
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    脚本代码 /kL $4CA  
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    '#Language "WWB-COM" E J$36  
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    Option Explicit C{sLz9  
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    Sub Main ] 2 #  
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        'Cleanup ;Op3?_  
        ClearOutputWindow() ,fK3ZC  
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        Print "Merging RPC Photonics BSDF Data Files" 'O5'i\uz  
        SetTextColor(255,0,0) Q-ni|  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." G+B~Ix-  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ;^*Unyt[4]  
        SetTextColor(0,0,0) hjaT^(Y  
    ]\/tVn.'  
        'Current directory of this script (should be the same as the text files being merged) mNmLyU=d  
        Dim cDir As String D:k 3" E"S  
        cDir = MacroDir$ & "\" o]nw0q?  
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        'Array which will be populated with the list of files to be merged D9`0Dr}/2  
        Dim fList() As String, curFile As String uwRr LF  
        GetFileList( cDir, fList ) <0yE 5Mrf  
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        Print "" .sQ=;w/ZA  
        Print "Files found for merging:" xs\!$*R  
        For Each curFile In fList OB[o2G<0  
            Print Chr(9) & curFile | 8qBm  
        Next Q{k At%  
    )p!7 #v/@f  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. >iS`pb  
        Dim nameArray() As String, sampName As String z4 &iK)x  
        nameArray = Split(fList(0)," 0-0.txt") IbcZ@'RSw  
        sampName  = nameArray(0) }FzqW*4~  
        Print "" YF+n b.0.  
        Print "Sample name: " & Chr(9) & sampName aM7uBx\8 5  
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        'Open an output file and write the FRED header data ZeG_en ;  
        Dim outFile As String gN)c  
        outFile = cDir & sampName & "_FRED.txt" A AHt218  
        Open outFile For Output As #1 Ed9Z9  
        Print #1, "type bsdf_data" h3T9"w[  
        Print #1, "format angles=deg bsdf=value scale=1" )'*5R<#  
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        'Loop the file list, skip the two header lines and write the remaining data to file =)hVn  
        Dim lineArray() As String, curLine As Long ^$&k5e/}C  
        For Each curFile In fList `R"I;qV  
            Print "Merging data from file " & curFile WK="J6K5  
            ReadFile( cDir & curFile, lineArray ) 6a;v&5  
            For curLine = 2 To UBound(lineArray) vD 5vbl  
                Print #1, lineArray(curLine) Q}S_%I}u:  
            Next ^ wY[3"{  
        Next  [ `]4P&  
    _|"Y]:j_  
        'Close the output file b)9'bJRvU  
        Close #1 )5|I_PXB  
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        Print "Finished merging RPC data for sample " & sampName c)@>zto#  
        Print "FRED formatted data file: " & Chr(9) & outFile S1/`th  
    End Sub _ Ro!"YVX  
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    'Utility function to read the contents of a file into an array of strings. M-i_#EWP  
    Function ReadFile(ByVal fileName As String, _ /m!Cc/Hv  
                      ByRef lineArray() As String) As Long iS5W>1]  
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        ReadFile = -1 0oEOre3^%  
        Dim oFSO As Object 3s"0SLS4  
        Set oFSO = CreateObject("Scripting.FileSystemObject") "zIFxDR#  
        Erase lineArray -{`@=U  
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        Dim fid As Long JWA@+u*k  
        If oFSO.fileexists( fileName ) Then BL 3gKx.'  
            fid = FreeFile() W+*5"h  
            Open fileName For Input As fid M)sZSH.<O  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) #z1H8CFL"  
            Close fid sBV 4)xM  
        End If >a3p >2  
        Set oFSO = Nothing YDGS}~m~Q  
        Return UBound( lineArray ) ={hX}"*D  
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    End Function @y31NH(  
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    Sub GetFileList( ByVal in_dir As String, _ 4e;QiTj  
                     ByRef in_flist() As String ) S~]mWxgZ  
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        'Redimension the file list array G<M:Ak+~  
        Erase in_flist t'm;:J1  
    ^[15&T5  
        'Tracks how many files are found nNXgW  
        Dim fCount As Long oA1a/[#  
        fCount = 0 #M A4  
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        'Recurse directory and search for text files fr!Pj(Q1  
        Dim f As String GJqE!I,.  
        f = Dir$(in_dir & "*.txt") b~-%c_  
        While f <> "" xUfbW;;]UU  
            ReDim Preserve in_flist(fCount) |pa$*/!NT  
            in_flist(fCount) = f  ["}rk  
            fCount += 1 eSW{Cb  
            f = Dir$() UU8pz{/  
        Wend ~n}k\s~|4  
        ReDim Preserve in_flist(fCount-1) O0>A+o[1F  
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    End Sub t20PP4FWM  
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