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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 6&Al9+$  
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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 E/[<} ./  
    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。 |5(< Vk=  
    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。 oI/jGyY;  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 O,>`#?  
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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。 aLKvl~s;m  
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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) vI)-Zz[3  
    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 \KpSYX1  
    例如下所示: EoOB0zo}Y+  
    Sample name:  EDF-C1-56 &1k2J   
    Merging data from file EDF-C1-56 0-0.txt a`:ag~op@&  
    Finished merging RPC data for sample EDF-C1-56 U:[#n5g  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt _#2AdhCu  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 OB&lq.r  
    a. 创建一个新的散射库 ED>T2.:{  
    b. 散射模型命名 ,*Vt53@E  
    c. 改变散射模型为“Tabulated BSDF”. m:{ws~   
    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 ) 8&0+Az"{O  
    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。 '&<T;V%  
    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 Fo0dz  
    g. 点击OK >#j f Z5t  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 4jyDM68i  
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    脚本代码 ~SWR|[  
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    '#Language "WWB-COM" n%"0%A  
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    Option Explicit h 9B^U?<wT  
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    Sub Main /<\B8^yQ  
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        'Cleanup ,2I8,MOg  
        ClearOutputWindow() 13X0LN  
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        Print "Merging RPC Photonics BSDF Data Files" q')MKR*  
        SetTextColor(255,0,0) z 5T_  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." X9d~r_2&m<  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." I`O)I&KH  
        SetTextColor(0,0,0) DV,rh83.ip  
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        'Current directory of this script (should be the same as the text files being merged) pu"`*NL  
        Dim cDir As String ?\eq!bu  
        cDir = MacroDir$ & "\" w=r3QKm#K  
    D m|_;iO,  
        'Array which will be populated with the list of files to be merged ]B;\?Tim  
        Dim fList() As String, curFile As String g7-=kmr|V  
        GetFileList( cDir, fList ) mM&*_#( 6  
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        Print "" !E0zj9 [ R  
        Print "Files found for merging:" $h({x~Oj9  
        For Each curFile In fList RnA>oKc  
            Print Chr(9) & curFile cP4K9:k  
        Next FzDZ<dJ  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. cvf@B_iN9  
        Dim nameArray() As String, sampName As String u)DhkF|  
        nameArray = Split(fList(0)," 0-0.txt") |kUxTe  
        sampName  = nameArray(0) A=v^`a03I  
        Print "" KvFGwq"X  
        Print "Sample name: " & Chr(9) & sampName ;U +;NsCH  
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        'Open an output file and write the FRED header data x}w"2[fL  
        Dim outFile As String D~;hIt*  
        outFile = cDir & sampName & "_FRED.txt" Pmj]"7Vd[  
        Open outFile For Output As #1 2hjR'6h"Y  
        Print #1, "type bsdf_data" P&ig.Og*  
        Print #1, "format angles=deg bsdf=value scale=1" ed,w-;(n~  
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        'Loop the file list, skip the two header lines and write the remaining data to file [I`r[u  
        Dim lineArray() As String, curLine As Long ,@_$acm  
        For Each curFile In fList S_z}h  
            Print "Merging data from file " & curFile ,C#Mf@b  
            ReadFile( cDir & curFile, lineArray ) Bh9O<|E  
            For curLine = 2 To UBound(lineArray) yAu-BObD  
                Print #1, lineArray(curLine) hLVS}HE2  
            Next MNE{mV(  
        Next zS@"ITy  
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        'Close the output file  Yfk){1  
        Close #1 c !$ 8>  
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        Print "Finished merging RPC data for sample " & sampName +DWmutL  
        Print "FRED formatted data file: " & Chr(9) & outFile 6\MJvg\;  
    End Sub Y* #'Gh,  
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    'Utility function to read the contents of a file into an array of strings. C-;y#a)  
    Function ReadFile(ByVal fileName As String, _ TJ:B_F*bSk  
                      ByRef lineArray() As String) As Long >H@ zP8  
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        ReadFile = -1 &S}i)Nu6J  
        Dim oFSO As Object hcw)qB,s  
        Set oFSO = CreateObject("Scripting.FileSystemObject") uC3o@qGW<  
        Erase lineArray }w \["r  
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        Dim fid As Long G`9\v=0  
        If oFSO.fileexists( fileName ) Then :*bmc/c  
            fid = FreeFile() apxZ}  
            Open fileName For Input As fid y.AF90Q>)  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) YfC1.8  
            Close fid tylMJ$ 9*.  
        End If la ~T)U7  
        Set oFSO = Nothing x1m J&D  
        Return UBound( lineArray ) ubV|s|J  
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    End Function 8K! l X  
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    Sub GetFileList( ByVal in_dir As String, _ DiK@>$v  
                     ByRef in_flist() As String ) r\y~ :  
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        'Redimension the file list array vUGEzCM  
        Erase in_flist 3~"G(UP  
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        'Tracks how many files are found ~X^L3=!vf  
        Dim fCount As Long tT}*%A  
        fCount = 0 esH>NH_  
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        'Recurse directory and search for text files O:fv1  
        Dim f As String =`5Xx(  
        f = Dir$(in_dir & "*.txt") :CO>g=`  
        While f <> ""  {g?$u  
            ReDim Preserve in_flist(fCount) +'abAST t  
            in_flist(fCount) = f 4P@Ak7iL(V  
            fCount += 1 & ?mH[rG"  
            f = Dir$() \|Pp%U [  
        Wend 5qkG~ YO-  
        ReDim Preserve in_flist(fCount-1) }EmNSs`$r  
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    End Sub 6[kp#  
     
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