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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 YZc{\~d  
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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 vn.j>;E'  
    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。 : UDh{GQ*  
    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。 j>O!|V  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Hg+bmwM  
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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。 L@~0`z:>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) ,Y27uey{wa  
    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 5NhwIu^<  
    例如下所示: fsV_>5I6  
    Sample name:  EDF-C1-56 X8   
    Merging data from file EDF-C1-56 0-0.txt 9:CM#N~?o  
    Finished merging RPC data for sample EDF-C1-56 WTj,9  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt iR{*X E   
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 6iJ\7  
    a. 创建一个新的散射库 w*IDL0#  
    b. 散射模型命名 ?`=r@  
    c. 改变散射模型为“Tabulated BSDF”. QR[i9'`<  
    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 ) 9Z.W R-}  
    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。 5H/D~hr&  
    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 )C#b83  
    g. 点击OK _iZ9Ch\  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 y (=$z/  
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    脚本代码 K`twbTU  
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    '#Language "WWB-COM" oz/Nx{bg  
    DBZ^n9  
    Option Explicit  z-;{pPZ  
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    Sub Main bjB4  
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        'Cleanup VK]sK e  
        ClearOutputWindow() vUgMfy&  
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        Print "Merging RPC Photonics BSDF Data Files" ])$Rw $`w  
        SetTextColor(255,0,0) |Fp+9U  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." tF~D!t@  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." nY50dFA,  
        SetTextColor(0,0,0) P^& =L&U  
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        'Current directory of this script (should be the same as the text files being merged) 6@geakq  
        Dim cDir As String 0m&W: c  
        cDir = MacroDir$ & "\" 05/'qf7P,U  
    cP`[/5R  
        'Array which will be populated with the list of files to be merged \LQ54^eB  
        Dim fList() As String, curFile As String v0'`K 5M  
        GetFileList( cDir, fList ) f|'8~C5I@>  
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        Print "" s|o+ Im  
        Print "Files found for merging:" 2H2Yxe7?-  
        For Each curFile In fList oTLpq:9J  
            Print Chr(9) & curFile Xi81?F?[  
        Next y6N }R  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. fFJu]  
        Dim nameArray() As String, sampName As String oS Apa  
        nameArray = Split(fList(0)," 0-0.txt") l"1at eM3  
        sampName  = nameArray(0) zJX _EO  
        Print "" DNy 6Kw  
        Print "Sample name: " & Chr(9) & sampName ]U)Yg  
    &BS*C} },  
        'Open an output file and write the FRED header data e)A-.SRiO$  
        Dim outFile As String ~Rk ~Zn  
        outFile = cDir & sampName & "_FRED.txt" Rr6}$]1  
        Open outFile For Output As #1 F<LRo}j"9Q  
        Print #1, "type bsdf_data" F%^)oQT+c  
        Print #1, "format angles=deg bsdf=value scale=1" QeNN*@ ='i  
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        'Loop the file list, skip the two header lines and write the remaining data to file Uy5G,!  
        Dim lineArray() As String, curLine As Long 9@yi UX  
        For Each curFile In fList kP,^c {  
            Print "Merging data from file " & curFile IJ#+"(?7,u  
            ReadFile( cDir & curFile, lineArray ) v2;' F  
            For curLine = 2 To UBound(lineArray) qM8"* dL  
                Print #1, lineArray(curLine) 5><KTya?=  
            Next c%vtg.A  
        Next (~OP)F).  
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        'Close the output file 8D6rShx =  
        Close #1 Dwuao`~Xm  
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        Print "Finished merging RPC data for sample " & sampName >dYN@cB$}  
        Print "FRED formatted data file: " & Chr(9) & outFile {?hpW+1,#  
    End Sub m*H' Cb  
    } za "rU  
    'Utility function to read the contents of a file into an array of strings. 9U]j@*QN  
    Function ReadFile(ByVal fileName As String, _ W}aCU~  
                      ByRef lineArray() As String) As Long K0C3s  
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        ReadFile = -1 }(/\vTn*1  
        Dim oFSO As Object bK#SxV  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ()o[(Hx+ph  
        Erase lineArray O =0j I  
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        Dim fid As Long <tT.m[qg  
        If oFSO.fileexists( fileName ) Then @e:= D  
            fid = FreeFile() X(JE]6_  
            Open fileName For Input As fid W\5PsGUsv  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) G;Py%8  
            Close fid z[+Sb;  
        End If P B?92py&  
        Set oFSO = Nothing 0I['UL^!F  
        Return UBound( lineArray ) br%l>Y\"  
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    End Function 5N(OW:M  
    ,Vfjt=6]}  
    Sub GetFileList( ByVal in_dir As String, _ X;7hy0Y  
                     ByRef in_flist() As String ) E_-QGE/1  
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        'Redimension the file list array pj#ls  
        Erase in_flist 0S2/,[-u+  
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        'Tracks how many files are found yZQcxg%  
        Dim fCount As Long {@ Z=b 5/P  
        fCount = 0 zyP9 n[eZ  
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        'Recurse directory and search for text files 3 nnoXc'  
        Dim f As String W^YaC (I  
        f = Dir$(in_dir & "*.txt") 6KDm#7J  
        While f <> "" i|[**P  
            ReDim Preserve in_flist(fCount) NOFuX9/'w  
            in_flist(fCount) = f qNi`OVh&  
            fCount += 1 J#xZ.6)  
            f = Dir$() %U6A"?To  
        Wend Z -fiJ75  
        ReDim Preserve in_flist(fCount-1) mI'&!@WG  
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    End Sub aM+Am,n`@  
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