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    [技术]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: 2023-05-11
    摘要 :[l\@>H1tX  
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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 (!L5-8O  
    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。 `>C<}xO  
    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。 YIRZ+H<Q  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 "r4AY  
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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。 N "tFP9;K  
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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) Vv.r8IGYm  
    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 S[3iA~)Z-  
    例如下所示: K)tQ]P  
    Sample name:  EDF-C1-56 HSUI${<  
    Merging data from file EDF-C1-56 0-0.txt tC?=E#3 V  
    Finished merging RPC data for sample EDF-C1-56 6RO(]5wX  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt f"[J "j8  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 #p(h]T32  
    a. 创建一个新的散射库 BXms;[  
    b. 散射模型命名 Kb#4ILA  
    c. 改变散射模型为“Tabulated BSDF”. !LMN[3M_  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) & F:IIo7  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 p@!nYPr.  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 `_I@i]i^  
    g. 点击OK Y_&g="`Q  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 2,2Z`X  
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    脚本代码 } "vW4   
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    '#Language "WWB-COM" =uk0@hy9b  
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    Option Explicit H`bSYjgM!  
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    Sub Main n9w9JXp;!  
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        'Cleanup 6oaazB^L  
        ClearOutputWindow() omO S=d!o  
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        Print "Merging RPC Photonics BSDF Data Files" ?_x q-  
        SetTextColor(255,0,0) 6=4wp?  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ^'CPM6J  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." j Uv!9Y}F  
        SetTextColor(0,0,0) >^q7c8]~g  
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        'Current directory of this script (should be the same as the text files being merged) )[H{yQ  
        Dim cDir As String MObt,[^W  
        cDir = MacroDir$ & "\" rk+#GO{  
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        'Array which will be populated with the list of files to be merged \P} p5k[  
        Dim fList() As String, curFile As String /kL $4CA  
        GetFileList( cDir, fList ) qPB8O1fyU  
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        Print "" q{s(.Uq$&  
        Print "Files found for merging:" C{sLz9  
        For Each curFile In fList 8h3=b[  
            Print Chr(9) & curFile ] 2 #  
        Next :tIC~GG]_)  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. t*@2OW`!  
        Dim nameArray() As String, sampName As String ~$' \L  
        nameArray = Split(fList(0)," 0-0.txt") tQZs.1=z  
        sampName  = nameArray(0) rG#Z=*b%  
        Print "" D3|oOOoG  
        Print "Sample name: " & Chr(9) & sampName A(?\>X 9g  
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        'Open an output file and write the FRED header data 4h@Z/G!T3  
        Dim outFile As String .s#;s'>g  
        outFile = cDir & sampName & "_FRED.txt" &_JD)mM5  
        Open outFile For Output As #1 k(zsm"<q  
        Print #1, "type bsdf_data" `D9]*c !mO  
        Print #1, "format angles=deg bsdf=value scale=1" W_m"ySQs  
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        'Loop the file list, skip the two header lines and write the remaining data to file [: xiZ  
        Dim lineArray() As String, curLine As Long &] \X]p  
        For Each curFile In fList iX0iRC6f  
            Print "Merging data from file " & curFile [V4{c@  
            ReadFile( cDir & curFile, lineArray ) : ^ 8  
            For curLine = 2 To UBound(lineArray) MCU_Z[N#10  
                Print #1, lineArray(curLine) 66^ycZCH  
            Next 763+uFx^  
        Next e]jH+IR:>  
    [((;+B  
        'Close the output file 8$(Dz]v|[&  
        Close #1 {]"]uT#  
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        Print "Finished merging RPC data for sample " & sampName D")_;NLE1  
        Print "FRED formatted data file: " & Chr(9) & outFile \~LQ%OM  
    End Sub V([~r,  
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    'Utility function to read the contents of a file into an array of strings. 5{n*"88  
    Function ReadFile(ByVal fileName As String, _ piU /&  
                      ByRef lineArray() As String) As Long 3Tn)Z1o  
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        ReadFile = -1 qlA7tU2p&  
        Dim oFSO As Object <hwy*uBrD  
        Set oFSO = CreateObject("Scripting.FileSystemObject") (`? y2n)~W  
        Erase lineArray rP!#RzL  
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        Dim fid As Long b T 2a40ul  
        If oFSO.fileexists( fileName ) Then upeU52@\  
            fid = FreeFile() Q}S_%I}u:  
            Open fileName For Input As fid ^ wY[3"{  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf)  [ `]4P&  
            Close fid _|"Y]:j_  
        End If b)9'bJRvU  
        Set oFSO = Nothing )5|I_PXB  
        Return UBound( lineArray ) C/(M"j M  
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    End Function S1/`th  
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    Sub GetFileList( ByVal in_dir As String, _ ho>k$s?  
                     ByRef in_flist() As String ) M-i_#EWP  
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        'Redimension the file list array }E`dZW*!!  
        Erase in_flist _-5,zP R  
    7Sz?S_N/j  
        'Tracks how many files are found *6 _tQ9G  
        Dim fCount As Long J)mh u}  
        fCount = 0 \6;=$f/?t  
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        'Recurse directory and search for text files J[^}u_z  
        Dim f As String o !4!"O'E  
        f = Dir$(in_dir & "*.txt") _gD pKEaY  
        While f <> "" Jv.U Q  
            ReDim Preserve in_flist(fCount) gIA@l `"  
            in_flist(fCount) = f d&#~ h:~  
            fCount += 1 V 21njRS  
            f = Dir$() 3BpZX`l*p  
        Wend :_Eqf8T  
        ReDim Preserve in_flist(fCount-1) Agrp(i"\@  
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    End Sub waKT{5k  
     
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