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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 K1_#Jhz  
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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 w6<zPrA  
    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。 kpLx?zW--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。 u.9syr  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 fA" VLQE  
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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。 z( ^ r  
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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) h;JO"J@H  
    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 zn2Qp  
    例如下所示: %Gc)$z/Wd  
    Sample name:  EDF-C1-56 :@]%n~x  
    Merging data from file EDF-C1-56 0-0.txt i&Xjbcbp  
    Finished merging RPC data for sample EDF-C1-56 @D+2dT0[M  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 'wd&O03&  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 LyNLz m5  
    a. 创建一个新的散射库 ?*dt JL  
    b. 散射模型命名 )m<CmYr2  
    c. 改变散射模型为“Tabulated BSDF”. xjH({(/B>a  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) :O/QgGZN$  
    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。 H}PZJf_E  
    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 T))F r:  
    g. 点击OK qj:\ )#I  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 {jOV8SVL  
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    脚本代码 $9rQ w1#e  
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    '#Language "WWB-COM" _ 0h)O  
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    Option Explicit cllnYvr3  
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    Sub Main ?~=5 x  
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        'Cleanup ?4H>1Wkb  
        ClearOutputWindow() "a=dx| Z  
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        Print "Merging RPC Photonics BSDF Data Files" 3F?_{A  
        SetTextColor(255,0,0) |"i"8~/@<  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." xM2UwTpW  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." QQ\\:]iM  
        SetTextColor(0,0,0) /4{IxQk  
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        'Current directory of this script (should be the same as the text files being merged) &h'NC%"v  
        Dim cDir As String Tu&W7aoX5  
        cDir = MacroDir$ & "\" 0P^&{ek+)  
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        'Array which will be populated with the list of files to be merged bmI6OIWl  
        Dim fList() As String, curFile As String > K s.  
        GetFileList( cDir, fList ) pz ~REsx  
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        Print "" {4YD_$4W  
        Print "Files found for merging:" L17{W4  
        For Each curFile In fList 80"oT'ZFh  
            Print Chr(9) & curFile P0ZY;/e5h  
        Next 1BOv|xPjZ  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ]6@6g>f?  
        Dim nameArray() As String, sampName As String {ug*  
        nameArray = Split(fList(0)," 0-0.txt") @Zw[LIQ*  
        sampName  = nameArray(0) X]c>clk,  
        Print "" ()(^B}VK  
        Print "Sample name: " & Chr(9) & sampName v(~EO(n.  
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        'Open an output file and write the FRED header data w-P;E!gTt  
        Dim outFile As String XVzsqi*Z  
        outFile = cDir & sampName & "_FRED.txt" LX{mr{  
        Open outFile For Output As #1 `i)Pf WdBN  
        Print #1, "type bsdf_data" y1#*c$ O  
        Print #1, "format angles=deg bsdf=value scale=1" dfWtLY  
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        'Loop the file list, skip the two header lines and write the remaining data to file =k##*%  
        Dim lineArray() As String, curLine As Long k%?qN,Cl  
        For Each curFile In fList 3v>w$6  
            Print "Merging data from file " & curFile k|3hs('y|  
            ReadFile( cDir & curFile, lineArray ) %hi]oz  
            For curLine = 2 To UBound(lineArray) V>& 1;n  
                Print #1, lineArray(curLine) Kj/Lcx;bh  
            Next y/;DA=  
        Next  V0!kvIv  
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        'Close the output file p Cgm!t?/  
        Close #1 'RZ0,SK'  
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        Print "Finished merging RPC data for sample " & sampName =4 NKXP~C  
        Print "FRED formatted data file: " & Chr(9) & outFile  z uI7Px  
    End Sub =}'7}0M_=  
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    'Utility function to read the contents of a file into an array of strings. N9 TM  
    Function ReadFile(ByVal fileName As String, _ gdkHaLL"  
                      ByRef lineArray() As String) As Long wQ?Z y;/S  
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        ReadFile = -1 k_`YVsEYP  
        Dim oFSO As Object ~toR)=Yv  
        Set oFSO = CreateObject("Scripting.FileSystemObject") : `,#z?Rk  
        Erase lineArray \ 0.!al0  
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        Dim fid As Long &neB$m3y  
        If oFSO.fileexists( fileName ) Then \?[m%$A  
            fid = FreeFile() ~(]'ah,  
            Open fileName For Input As fid 8 @r>`c  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) *0Wkz'=U  
            Close fid $ZlzS`XF7  
        End If 6W9lKD_i  
        Set oFSO = Nothing sN ZOm$  
        Return UBound( lineArray ) 5MK.>3fE  
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    End Function O)c3Lm-w  
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    Sub GetFileList( ByVal in_dir As String, _ >N"=10  
                     ByRef in_flist() As String ) 7>f)pfLM  
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        'Redimension the file list array kH?PEA! \  
        Erase in_flist HG^~7oMf  
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        'Tracks how many files are found .J?RaH{i  
        Dim fCount As Long lL&p?MUp  
        fCount = 0 Y4N)yMSl"  
    ]F #0to  
        'Recurse directory and search for text files \6!s";=hQ  
        Dim f As String AmK g;9LS  
        f = Dir$(in_dir & "*.txt") Sg1 ,9[pb  
        While f <> "" f!G%$?]  
            ReDim Preserve in_flist(fCount) d>wG6Z,|  
            in_flist(fCount) = f Yu:($//w  
            fCount += 1 S+l>@wa)|  
            f = Dir$() xP &@|Ag  
        Wend at(gem  
        ReDim Preserve in_flist(fCount-1) J]|S0JC`  
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    End Sub [ZD`t,x(  
     
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