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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 EmP2r*"rb  
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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 vl%Pg !l  
    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。 .:;q8FL/  
    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。 ;lTgihW-  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 L`^ v"W()  
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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。 =E~SaT  
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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) JvW!w)$pY  
    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 8Waic&lX~  
    例如下所示: xxdxRy9/  
    Sample name:  EDF-C1-56 dUceZmAl  
    Merging data from file EDF-C1-56 0-0.txt 2b#> ~  
    Finished merging RPC data for sample EDF-C1-56 % =v<3  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt (%M:=zm  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 gp{P _  
    a. 创建一个新的散射库 R ta_\Aj!  
    b. 散射模型命名 #M[Cq= 2  
    c. 改变散射模型为“Tabulated BSDF”. $:DhK  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) rIH+X2 x  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 u C`)?f*I  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 G&0JK ,Y  
    g. 点击OK hA"z0Fszh  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 KR4RIJZ_t  
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    脚本代码 !{oP'8Ax$  
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    '#Language "WWB-COM" kca  Y  
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    Option Explicit $4TawFf"nc  
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    Sub Main cFG%Ew@  
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        'Cleanup RK=YFE 0  
        ClearOutputWindow() *:,7 A9LY  
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        Print "Merging RPC Photonics BSDF Data Files" 1FC 1*7A[  
        SetTextColor(255,0,0) C  F<  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 9DmQ  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." (KG>lTdN  
        SetTextColor(0,0,0) DfP vi1  
    !O8vr4=  
        'Current directory of this script (should be the same as the text files being merged) noNL.%I  
        Dim cDir As String .gHL(*1P  
        cDir = MacroDir$ & "\" Ibl==Irk  
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        'Array which will be populated with the list of files to be merged -U_<:  
        Dim fList() As String, curFile As String 8DNGqaH;dt  
        GetFileList( cDir, fList ) $yg}HS7HC  
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        Print "" ;tLu  
        Print "Files found for merging:" C{):jH,Rf  
        For Each curFile In fList Q1@V?`rkS{  
            Print Chr(9) & curFile r`/tb^  
        Next "Mmvf'N  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. I"+;L4o`  
        Dim nameArray() As String, sampName As String CpICb9w  
        nameArray = Split(fList(0)," 0-0.txt") =Wk!mGc  
        sampName  = nameArray(0) 2myHn/%C  
        Print "" pfvNVu  
        Print "Sample name: " & Chr(9) & sampName $ V"7UA22  
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        'Open an output file and write the FRED header data Y 1vSwS%{T  
        Dim outFile As String PDssEb7  
        outFile = cDir & sampName & "_FRED.txt" a|@^ N  
        Open outFile For Output As #1 G%K<YyAP  
        Print #1, "type bsdf_data" nPUq+cXy]C  
        Print #1, "format angles=deg bsdf=value scale=1" Jk7[}Jc$  
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        'Loop the file list, skip the two header lines and write the remaining data to file vrIM!~*W  
        Dim lineArray() As String, curLine As Long eESJk 14  
        For Each curFile In fList P A9 ]L  
            Print "Merging data from file " & curFile a4! AvG  
            ReadFile( cDir & curFile, lineArray ) n2H2G_-L[  
            For curLine = 2 To UBound(lineArray) {N$G|bm]u<  
                Print #1, lineArray(curLine) ]7^YPFc+  
            Next 2FS,B\d  
        Next S<LHNZu|^A  
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        'Close the output file l>M&S^/s j  
        Close #1 =`rESb[  
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        Print "Finished merging RPC data for sample " & sampName _>*$%R  
        Print "FRED formatted data file: " & Chr(9) & outFile "ND 7,rQ  
    End Sub (byFr9z  
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    'Utility function to read the contents of a file into an array of strings. dYJW`Q;j.|  
    Function ReadFile(ByVal fileName As String, _ "Gxf[6B  
                      ByRef lineArray() As String) As Long Ydu=J g5u7  
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        ReadFile = -1 W6~B~L  
        Dim oFSO As Object @&d/}Mx"t  
        Set oFSO = CreateObject("Scripting.FileSystemObject") !T|X/B R  
        Erase lineArray ?!-2G  
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        Dim fid As Long -q\1Tlc]3  
        If oFSO.fileexists( fileName ) Then )fR'1_  
            fid = FreeFile() z&d&Ky  
            Open fileName For Input As fid 0*8[m+j1  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) dM7-,9Vc  
            Close fid ( _E<?  
        End If 1< ;<?  
        Set oFSO = Nothing 6546"sU  
        Return UBound( lineArray ) T.aY {Y  
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    End Function %Sfew/"R0  
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    Sub GetFileList( ByVal in_dir As String, _ 4S@^ym  
                     ByRef in_flist() As String ) +X0?bVT  
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        'Redimension the file list array {v56k8uZ  
        Erase in_flist xO6)lVd  
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        'Tracks how many files are found b4s.`%U  
        Dim fCount As Long 9#.nNv*z3  
        fCount = 0 ep Eg 6   
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        'Recurse directory and search for text files >ZuWsA0q  
        Dim f As String N%:QaCZKw  
        f = Dir$(in_dir & "*.txt") u-At k-2M  
        While f <> "" Y_)!U`>N?  
            ReDim Preserve in_flist(fCount) k 0z2)3L  
            in_flist(fCount) = f !,PG!Gnl  
            fCount += 1 y'pAhdF  
            f = Dir$() p0UR5A>p  
        Wend -Yy,L%E]F:  
        ReDim Preserve in_flist(fCount-1) @%fNB,H`  
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    End Sub (5re'Pl  
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    QQ:2987619807 B{lBUv(B  
     
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