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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 J4#t1P@Na  
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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 8 sZ~3  
    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。 QU_O9 BN  
    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。 s"#JBw\7  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 &[f.;1+C  
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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。 (ec?_N0=  
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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) $73 7oV<  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 vyP3]+n  
    例如下所示: y8'WR-;  
    Sample name:  EDF-C1-56 S Cs@Q  
    Merging data from file EDF-C1-56 0-0.txt S#Tc{@e  
    Finished merging RPC data for sample EDF-C1-56  ^E*W B~  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt y Q-&+16^  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 x*Y&s<  
    a. 创建一个新的散射库 ZdJwy%  
    b. 散射模型命名 R5c Ya  
    c. 改变散射模型为“Tabulated BSDF”. o?$kcI4  
    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 ) jFY6}WY)}7  
    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。 (lq7 ct  
    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 kRo dC(f @  
    g. 点击OK '^)Ve:K-.  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 HgPRz C  
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    脚本代码 Fk@A;22N  
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    '#Language "WWB-COM" +e?mKLw14  
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    Option Explicit aG.j0`)%  
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    Sub Main qP{S!Z(  
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        'Cleanup "| 0g 1rd  
        ClearOutputWindow() 83~ Gu[  
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        Print "Merging RPC Photonics BSDF Data Files" qR^KvAEQSo  
        SetTextColor(255,0,0) X]ow5{e  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." eIBHAdU+g/  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 8.FBgZh*  
        SetTextColor(0,0,0) Pw i6Ly`  
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        'Current directory of this script (should be the same as the text files being merged) hfT HP  
        Dim cDir As String 35I y\  
        cDir = MacroDir$ & "\" 2c`m8EaJ  
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        'Array which will be populated with the list of files to be merged p?(w !O  
        Dim fList() As String, curFile As String |g<1n  
        GetFileList( cDir, fList ) [ lZo'o  
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        Print "" AoB~ZWq  
        Print "Files found for merging:" gZ%wm Y  
        For Each curFile In fList "S#4  
            Print Chr(9) & curFile ]vj4E"2;  
        Next Z0*Lm+d9z  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ^*.S7.;2o  
        Dim nameArray() As String, sampName As String c&r8q]u  
        nameArray = Split(fList(0)," 0-0.txt") 4|*b{Ni  
        sampName  = nameArray(0) e+jp03m\W  
        Print "" "Y0:Y?Vz"  
        Print "Sample name: " & Chr(9) & sampName L".Qf|b*  
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        'Open an output file and write the FRED header data ,4W| e!  
        Dim outFile As String 7 j$ |fS  
        outFile = cDir & sampName & "_FRED.txt" NX7(;02  
        Open outFile For Output As #1 Lt ; !q b.  
        Print #1, "type bsdf_data" /*3[9,  
        Print #1, "format angles=deg bsdf=value scale=1" ^9*FYV  
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        'Loop the file list, skip the two header lines and write the remaining data to file tYV%izE  
        Dim lineArray() As String, curLine As Long :Awnj!KNCc  
        For Each curFile In fList XQL"D)fw  
            Print "Merging data from file " & curFile s`"o-w\$>  
            ReadFile( cDir & curFile, lineArray ) C"l_78  
            For curLine = 2 To UBound(lineArray) k8fvg4  
                Print #1, lineArray(curLine) )9'eckt  
            Next 6&/H XqP  
        Next BDoL)}bRE  
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        'Close the output file xbJ@z {  
        Close #1 SN2X{Q|*  
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        Print "Finished merging RPC data for sample " & sampName Y"qKe,  
        Print "FRED formatted data file: " & Chr(9) & outFile P|}~=2J  
    End Sub N)'oX3?x  
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    'Utility function to read the contents of a file into an array of strings. @Dc?fyY*o<  
    Function ReadFile(ByVal fileName As String, _ 0v6(A4Y  
                      ByRef lineArray() As String) As Long L~e\uP  
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        ReadFile = -1 P(?i>F7s  
        Dim oFSO As Object 9^l[d<  
        Set oFSO = CreateObject("Scripting.FileSystemObject") j" wX7  
        Erase lineArray e='bc7$  
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        Dim fid As Long i8R.Wl$l  
        If oFSO.fileexists( fileName ) Then 'VA\dpa{J  
            fid = FreeFile() GE4d=;5  
            Open fileName For Input As fid 2yqm$i9C  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) o6f^DG3*  
            Close fid \+OP!`  
        End If d"zbY\`  
        Set oFSO = Nothing ,EPs>#d  
        Return UBound( lineArray ) -:9E+b  
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    End Function l!Q |]-.@  
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    Sub GetFileList( ByVal in_dir As String, _ ow:}NI  
                     ByRef in_flist() As String ) I"awvUP]a[  
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        'Redimension the file list array h%e}4U@X  
        Erase in_flist a<+Qw'  
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        'Tracks how many files are found EoLF7j<W  
        Dim fCount As Long |RT#ZMJek  
        fCount = 0 x Lht6%o*  
    @}@`lv65}  
        'Recurse directory and search for text files #"|Y"#@k  
        Dim f As String (1e;7sNG@  
        f = Dir$(in_dir & "*.txt") >o{(f  
        While f <> "" 12)~PIaF  
            ReDim Preserve in_flist(fCount) b~\gV_Z  
            in_flist(fCount) = f dtJaQ`  
            fCount += 1 w-Zb($_  
            f = Dir$() B.2F\ub g  
        Wend MsOO''o  
        ReDim Preserve in_flist(fCount-1) Zf;1U98oC  
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    End Sub e9r#r~Qq|  
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