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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 mXT{c=N)w  
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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 uoq|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。 )uO 3v  
    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。 CqLAtS X7  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 PTpGZ2FZ  
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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。 ? @- t.N  
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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) %'MR;hQsd8  
    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 ]RuH6d2d|  
    例如下所示: vMYEP_lhK,  
    Sample name:  EDF-C1-56 [Qn=y/._r  
    Merging data from file EDF-C1-56 0-0.txt V!f' O@p[  
    Finished merging RPC data for sample EDF-C1-56 u >.>hQ  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt rsD? ;XzH  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 /Z2 g >  
    a. 创建一个新的散射库 7 V=%&+  
    b. 散射模型命名 `aL4YH-v  
    c. 改变散射模型为“Tabulated BSDF”. MC_i"P6a  
    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 ) LIh71Vg/cc  
    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。 l(3\ekU!  
    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 V4. }wz_Y  
    g. 点击OK -:Jn|=  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ui&^ m,  
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    脚本代码 jN%+)Kj0C)  
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    '#Language "WWB-COM" 4EFP*7X  
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    Option Explicit wV"C ,*V  
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    Sub Main m8 Ti{w(  
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        'Cleanup pbNW l/|4  
        ClearOutputWindow() { \5-b:#_  
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        Print "Merging RPC Photonics BSDF Data Files" 7VA6J-T  
        SetTextColor(255,0,0) |dqvv  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." u`wT_?%w  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." PF] Vt  
        SetTextColor(0,0,0) XaYgl&x'!x  
    ; Rd\yAG  
        'Current directory of this script (should be the same as the text files being merged) KDYyLkI dr  
        Dim cDir As String 6'JP%~QlS  
        cDir = MacroDir$ & "\" y:dwx*Q9I  
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        'Array which will be populated with the list of files to be merged `bEum3l\6]  
        Dim fList() As String, curFile As String !gG\jC~n  
        GetFileList( cDir, fList ) b* o,re)Dj  
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        Print "" .iH#8Z  
        Print "Files found for merging:" 3bMUsyJ2  
        For Each curFile In fList kA(q-Re$B*  
            Print Chr(9) & curFile BXX1G  
        Next bn8?-  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. g<PdiVp+  
        Dim nameArray() As String, sampName As String 2O)2#N  
        nameArray = Split(fList(0)," 0-0.txt") f n'N^  
        sampName  = nameArray(0) 2s8(r8AI  
        Print "" Y\ G^W8  
        Print "Sample name: " & Chr(9) & sampName TkV$h(#!f&  
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        'Open an output file and write the FRED header data :Qklbd[9qF  
        Dim outFile As String aoS]Qp  
        outFile = cDir & sampName & "_FRED.txt" |cq%eN  
        Open outFile For Output As #1 von~-51;  
        Print #1, "type bsdf_data" 4!tHJCq"  
        Print #1, "format angles=deg bsdf=value scale=1" g6 3?(+Fz  
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        'Loop the file list, skip the two header lines and write the remaining data to file ti9 cfv>  
        Dim lineArray() As String, curLine As Long xn)r6  
        For Each curFile In fList . G ~,h  
            Print "Merging data from file " & curFile =Pg u?WU@  
            ReadFile( cDir & curFile, lineArray ) z/t:gc.  
            For curLine = 2 To UBound(lineArray) }V % b  
                Print #1, lineArray(curLine) Y&_1U/}h  
            Next O5p]E7/e  
        Next P1m PC  
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        'Close the output file ?#X`Eu  
        Close #1 aXefi'!6  
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        Print "Finished merging RPC data for sample " & sampName 6'N!)b^-  
        Print "FRED formatted data file: " & Chr(9) & outFile Q{Lsr,  
    End Sub 5-pz/%,  
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    'Utility function to read the contents of a file into an array of strings. DeTZl+qm1E  
    Function ReadFile(ByVal fileName As String, _ GQ8r5V4:  
                      ByRef lineArray() As String) As Long .o5r;KD  
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        ReadFile = -1 g1`/xJz|  
        Dim oFSO As Object ,/g\;#:{@]  
        Set oFSO = CreateObject("Scripting.FileSystemObject") c=p@l<)  
        Erase lineArray  Cz_chK4  
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        Dim fid As Long k&P_ c  
        If oFSO.fileexists( fileName ) Then WwDxZ>9jw  
            fid = FreeFile() Y">;2Pt;  
            Open fileName For Input As fid 8}W06k>)%  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 3f :I<S7  
            Close fid Xsc5@O!  
        End If UI:{*N**Z  
        Set oFSO = Nothing `$\Y,9E}x  
        Return UBound( lineArray ) p=(;WnsK  
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    End Function bMD'teJ  
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    Sub GetFileList( ByVal in_dir As String, _ "ppT<8Qi'  
                     ByRef in_flist() As String ) TPds)osZT  
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        'Redimension the file list array 'gojP  
        Erase in_flist FZ/l T-"  
    <nj[=C4v  
        'Tracks how many files are found %zyMWC  
        Dim fCount As Long (K+TqJw  
        fCount = 0 [#td  
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        'Recurse directory and search for text files O.E   
        Dim f As String rQ'tab.,]  
        f = Dir$(in_dir & "*.txt") [j0I}+@4H  
        While f <> "" @"HR"@pX  
            ReDim Preserve in_flist(fCount) Wx/!My u  
            in_flist(fCount) = f ?8(`tS(_?  
            fCount += 1 >{4pEy  
            f = Dir$() tGd<{nF%2  
        Wend Hk\+;'PrN  
        ReDim Preserve in_flist(fCount-1) g}3c r .  
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    End Sub )B*?se]LJ  
     
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