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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 3K?0PRg  
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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 4[J3HLQ  
    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。 0X0D8H(7Q  
    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。 #Y5I_:k  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 44W3U~1  
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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。  ,g,jY]o  
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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) jYy0^)6X(  
    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 Y;&#Ur8q  
    例如下所示: EkL\~^  
    Sample name:  EDF-C1-56 *b)b#p  
    Merging data from file EDF-C1-56 0-0.txt y:A0!75  
    Finished merging RPC data for sample EDF-C1-56 \9}5}X_x.  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt r6$=|Yto  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 %b{!9-n}  
    a. 创建一个新的散射库 Qi[D&47XO  
    b. 散射模型命名 bY2Mw8e%  
    c. 改变散射模型为“Tabulated BSDF”. zl:D|h77  
    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 ) x>J3tp$2  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ;yZ N "r  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 4jz]c"p-  
    g. 点击OK 7P`1)juA9  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Mz G ryM-  
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    脚本代码 >1~`tP  
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    '#Language "WWB-COM" 5qr!OEF2  
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    Option Explicit O0{  
    !p&'so^-W  
    Sub Main ? g{,MP5  
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        'Cleanup O<h#|g1  
        ClearOutputWindow() Qf|}%}% fp  
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        Print "Merging RPC Photonics BSDF Data Files" 7:L~n(QpP  
        SetTextColor(255,0,0) 4sj%:  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 1Q J$yr  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." B<XPu=|  
        SetTextColor(0,0,0) 3rY /6{  
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        'Current directory of this script (should be the same as the text files being merged) E`4=C@NN+,  
        Dim cDir As String kVrT?  
        cDir = MacroDir$ & "\" GF!{SO4  
    %'T>kz*A  
        'Array which will be populated with the list of files to be merged y|Y3,s  
        Dim fList() As String, curFile As String WHZng QmY  
        GetFileList( cDir, fList ) B%@!\ D#  
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        Print "" w)eQ'6Vu  
        Print "Files found for merging:" ptv 4v[gQ  
        For Each curFile In fList ijqdZ+  
            Print Chr(9) & curFile %gMpV  
        Next R{o*O_qX  
    #=H}6!18  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 3Gl]g/  
        Dim nameArray() As String, sampName As String otVyuh  
        nameArray = Split(fList(0)," 0-0.txt") *wB-lg7%  
        sampName  = nameArray(0) ]0i2 ]=J&,  
        Print "" \u _v7g  
        Print "Sample name: " & Chr(9) & sampName ePpK+E[0Z  
    'B5J.Xe:  
        'Open an output file and write the FRED header data _O;~ }N4u  
        Dim outFile As String /C"s_:m;3  
        outFile = cDir & sampName & "_FRED.txt" '%!M>rY,  
        Open outFile For Output As #1 OPY/XKyY,  
        Print #1, "type bsdf_data" W:poUG1UR  
        Print #1, "format angles=deg bsdf=value scale=1" d+2O^of:T  
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        'Loop the file list, skip the two header lines and write the remaining data to file A4Q)YY9~  
        Dim lineArray() As String, curLine As Long .(1j!B4^  
        For Each curFile In fList WQLL[{mhS  
            Print "Merging data from file " & curFile %H}Y]D~R  
            ReadFile( cDir & curFile, lineArray ) e~s7ggg2k  
            For curLine = 2 To UBound(lineArray) n{Qh8"  
                Print #1, lineArray(curLine) Z)O>h^0  
            Next T7,Gf({  
        Next :z} _y&]  
    Z^`=!n-V  
        'Close the output file _d0-%B 9m  
        Close #1 SxW}Z_8x  
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        Print "Finished merging RPC data for sample " & sampName 3zA=q[C  
        Print "FRED formatted data file: " & Chr(9) & outFile q\b ?o!# _  
    End Sub lzy$.H"W  
    e=]oh$]  
    'Utility function to read the contents of a file into an array of strings. jbhJ;c:  
    Function ReadFile(ByVal fileName As String, _ Go+xL/f  
                      ByRef lineArray() As String) As Long 3Ra\2(bR  
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        ReadFile = -1 ;Jbc'V'fm  
        Dim oFSO As Object Sp~Gv>uMK  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Bx}0E  
        Erase lineArray h>^jq{yu  
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        Dim fid As Long aC8,Y$>?E`  
        If oFSO.fileexists( fileName ) Then >,"D9!  
            fid = FreeFile() %AEK[W+0  
            Open fileName For Input As fid G\:psx/  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 6KCCbg/  
            Close fid *L4]\wf  
        End If hKH$AEHEU}  
        Set oFSO = Nothing 3dxnh,]&@  
        Return UBound( lineArray ) bDZKQ&  
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    End Function ] EVe@  
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    Sub GetFileList( ByVal in_dir As String, _ *t?~)o7  
                     ByRef in_flist() As String ) }KD7 Y  
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        'Redimension the file list array KT lP:pB;  
        Erase in_flist {+/ .5  
    rAlh& ?X  
        'Tracks how many files are found G>[ NZE  
        Dim fCount As Long Rg8m4xw  
        fCount = 0 '!+ P{  
    2Z/][?Jj{  
        'Recurse directory and search for text files yBPt%EF  
        Dim f As String _UH/}!nqB  
        f = Dir$(in_dir & "*.txt") C>Omng1>^  
        While f <> "" :_o] F  
            ReDim Preserve in_flist(fCount) -TK|Y"  
            in_flist(fCount) = f Nl$gU3kL  
            fCount += 1 Z^'?|qFj!  
            f = Dir$() RV0>-@/x  
        Wend ih+*T1#:(  
        ReDim Preserve in_flist(fCount-1) \A'|XdQ  
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    End Sub iA55yT+  
     
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