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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 UP*yeT,P,  
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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 ~,+[M-  
    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。 5W5pRd>Q  
    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\GKqt;5@  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 6(sfpK'  
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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。 cnYYs d{  
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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) ls]Elo8h1f  
    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 ;pCG9  
    例如下所示: 9XY|V<}  
    Sample name:  EDF-C1-56 [L)V(o)v  
    Merging data from file EDF-C1-56 0-0.txt GZ.?MnG  
    Finished merging RPC data for sample EDF-C1-56 25w6KBTe;:  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt k0=|10bi  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 eb(m8vLR  
    a. 创建一个新的散射库 )/ n29]  
    b. 散射模型命名 739l%u }<  
    c. 改变散射模型为“Tabulated BSDF”. =b|)Wnt2f  
    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 ) >02i8:Tp5K  
    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。 [lrmuf  
    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 RNl\`>Cz  
    g. 点击OK _4!7 zW^  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 &<#/&Pq/i  
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    脚本代码 ` 3vN R"  
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    '#Language "WWB-COM" J>/Ci\OB  
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    Option Explicit )m oo?Q  
    0  %C!`7  
    Sub Main ~4}*Dhsh  
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        'Cleanup lu<Np9/5<  
        ClearOutputWindow() gE-lM/w  
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        Print "Merging RPC Photonics BSDF Data Files" (4E.Li<O  
        SetTextColor(255,0,0) s= 3EBh  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." B6^w{eXN  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." R4[. n@  
        SetTextColor(0,0,0) q^Q|.&_k /  
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        'Current directory of this script (should be the same as the text files being merged) cob9hj#&7  
        Dim cDir As String Z 5{*? 2  
        cDir = MacroDir$ & "\" fbi H   
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        'Array which will be populated with the list of files to be merged O1l4gduN|i  
        Dim fList() As String, curFile As String ,dGFX]P  
        GetFileList( cDir, fList ) l;"ub^AH  
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        Print "" k4]R]=Fh.  
        Print "Files found for merging:" ksxO<Y  
        For Each curFile In fList w}]3jc84  
            Print Chr(9) & curFile ZA 99vO  
        Next e2,<,~_K6  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ft*G*.0kO  
        Dim nameArray() As String, sampName As String # khyy-B=  
        nameArray = Split(fList(0)," 0-0.txt") 6i*p +S?U"  
        sampName  = nameArray(0) x`/m>~_  
        Print "" ,.1&Ff)S  
        Print "Sample name: " & Chr(9) & sampName 9;m#>a@Y  
    /It.>1~2@  
        'Open an output file and write the FRED header data B h.6:9{  
        Dim outFile As String >@q2FSMf  
        outFile = cDir & sampName & "_FRED.txt" kM6 EZ`mj  
        Open outFile For Output As #1 H >@JfYZ0  
        Print #1, "type bsdf_data" a78;\{&L'  
        Print #1, "format angles=deg bsdf=value scale=1" n57c^/A*  
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        'Loop the file list, skip the two header lines and write the remaining data to file ~7eUt^SD;  
        Dim lineArray() As String, curLine As Long 'Sb6 w+  
        For Each curFile In fList CU} q&6h  
            Print "Merging data from file " & curFile 6+{nw}e8  
            ReadFile( cDir & curFile, lineArray ) &B{Jxc`VA  
            For curLine = 2 To UBound(lineArray) sf|_2sI  
                Print #1, lineArray(curLine) &~D.")Dz  
            Next oeRYyJ  
        Next mt&JgA/  
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        'Close the output file 0t/z "  
        Close #1 HY%6eUhj  
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        Print "Finished merging RPC data for sample " & sampName 2t Z\{=  
        Print "FRED formatted data file: " & Chr(9) & outFile  9\W5   
    End Sub &].1[&M]  
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    'Utility function to read the contents of a file into an array of strings. t9=|* =;9)  
    Function ReadFile(ByVal fileName As String, _ q>Ar.5&M_  
                      ByRef lineArray() As String) As Long d/-0B<ts  
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        ReadFile = -1 h&^/, G  
        Dim oFSO As Object N5I W@?4  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 3GuMiht5  
        Erase lineArray S+bWD7  
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        Dim fid As Long VS@rM<K{  
        If oFSO.fileexists( fileName ) Then ^ZViQ$a"h;  
            fid = FreeFile() Q& unA3  
            Open fileName For Input As fid J{'zkR?Lr  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) / F  
            Close fid E6KBpQcd[  
        End If i}&mz~  
        Set oFSO = Nothing ]jT[dX|?  
        Return UBound( lineArray ) |^&2zyUj/  
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    End Function / hj9Q!  
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    Sub GetFileList( ByVal in_dir As String, _ 'E6gEJ  
                     ByRef in_flist() As String ) myo~Qqt?  
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        'Redimension the file list array 1k70>RQ&69  
        Erase in_flist Dg2#Gv0B  
    -|iA!w#31  
        'Tracks how many files are found pU)3*9?cIl  
        Dim fCount As Long {/VL\AW5$  
        fCount = 0 yl]Cm?8  
    =v#A&IPA'  
        'Recurse directory and search for text files ]NhWhJ:  
        Dim f As String Nv$gKC6 ,G  
        f = Dir$(in_dir & "*.txt") U\!LZ?gC  
        While f <> "" ~a0}  
            ReDim Preserve in_flist(fCount) ]Pl6:FB8%@  
            in_flist(fCount) = f ,Z\,IRn  
            fCount += 1 *V<2\-  
            f = Dir$() 5'L}LT8p@  
        Wend 2|H'j~  
        ReDim Preserve in_flist(fCount-1) kQiW5  
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    End Sub /01(9(  
     
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