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    [分享]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: 2020-12-15
    摘要 B}?/oZW 4  
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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 VvoJ85  
    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。 lGcHfW)Y  
    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。 y XS/3_A{  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 (:hPT-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。 9Y/c<gbY  
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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) @l@lE0  
    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 z:fd'NC  
    例如下所示: gzC\6ca  
    Sample name:  EDF-C1-56 d<Z`)hI{K  
    Merging data from file EDF-C1-56 0-0.txt NghQ#c  
    Finished merging RPC data for sample EDF-C1-56 @A yC0}  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt O^e !<bBd  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 wuh$=fya  
    a. 创建一个新的散射库 ^ qE4:|e  
    b. 散射模型命名 Mr`u!T&sc  
    c. 改变散射模型为“Tabulated BSDF”. #}B~V3UD  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) +J#H9>To!  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 52:oe1-8  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 :jUd?(  
    g. 点击OK lSbAZ6  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Qp-nr]  
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    脚本代码 Fd ]! 7  
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    '#Language "WWB-COM" LoTq2/  
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    Option Explicit ZegsV|  
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    Sub Main n#x{~oQc  
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        'Cleanup Z0-W%W  
        ClearOutputWindow() a_pkUOu6  
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        Print "Merging RPC Photonics BSDF Data Files" d;'@4NX5+  
        SetTextColor(255,0,0) blS*HKw  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." m_St"`6 .  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." j)J4[j  
        SetTextColor(0,0,0) ; /EH@V|  
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        'Current directory of this script (should be the same as the text files being merged) @gTpiV2  
        Dim cDir As String R;,&CQUl  
        cDir = MacroDir$ & "\" OBj .-jL  
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        'Array which will be populated with the list of files to be merged }TYCF@  
        Dim fList() As String, curFile As String D* Vr)J  
        GetFileList( cDir, fList ) o 'yR^`  
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        Print "" 3xj<ATSe  
        Print "Files found for merging:" {Y IVHl  
        For Each curFile In fList <QszmE  
            Print Chr(9) & curFile D./e|i?  
        Next -|V@zSKr3  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ]C]tLJ!M  
        Dim nameArray() As String, sampName As String 5*4P_q(AxD  
        nameArray = Split(fList(0)," 0-0.txt") T0aK1Lh  
        sampName  = nameArray(0) bt~-=\  
        Print "" ^t#]E#  
        Print "Sample name: " & Chr(9) & sampName NO6.qWl  
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        'Open an output file and write the FRED header data ,`H=%#  
        Dim outFile As String a eP4%h  
        outFile = cDir & sampName & "_FRED.txt" #7'ww*+  
        Open outFile For Output As #1 @ZT25CD  
        Print #1, "type bsdf_data" J }JT%S W  
        Print #1, "format angles=deg bsdf=value scale=1" :X@;XEol~  
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        'Loop the file list, skip the two header lines and write the remaining data to file x}F.<`  
        Dim lineArray() As String, curLine As Long 7E|0'PPR  
        For Each curFile In fList x)V.^-  
            Print "Merging data from file " & curFile ^\_`0%`>  
            ReadFile( cDir & curFile, lineArray ) pY-iz M L  
            For curLine = 2 To UBound(lineArray) Ry/NfF=  
                Print #1, lineArray(curLine) #<se0CJB  
            Next !y*V;J  
        Next (<1DPpy95O  
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        'Close the output file (-"A5(X:/  
        Close #1 /\Q{i#v  
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        Print "Finished merging RPC data for sample " & sampName -?@ $`{-K  
        Print "FRED formatted data file: " & Chr(9) & outFile > %d]"]  
    End Sub l<v /T  
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    'Utility function to read the contents of a file into an array of strings. y )/d-  
    Function ReadFile(ByVal fileName As String, _ nw\p3  
                      ByRef lineArray() As String) As Long Gt-  -7S  
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        ReadFile = -1 1eT|  
        Dim oFSO As Object d(fgv  
        Set oFSO = CreateObject("Scripting.FileSystemObject") t,MK#Ko  
        Erase lineArray 5X~ko>  
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        Dim fid As Long TTqOAo[-Z  
        If oFSO.fileexists( fileName ) Then b6Ntt Y!3  
            fid = FreeFile() )rj.WK.  
            Open fileName For Input As fid L@G)K  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Jr1^qY`0+  
            Close fid R[#5E|` `9  
        End If ?g<*1N?:  
        Set oFSO = Nothing Y&gfe8%5N  
        Return UBound( lineArray ) P,wFib^1  
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    End Function 7<NX;Fx  
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    Sub GetFileList( ByVal in_dir As String, _ w7%N=hL1   
                     ByRef in_flist() As String ) .+B!mmp  
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        'Redimension the file list array Vy(lyD<6  
        Erase in_flist SSI&WZ2a  
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        'Tracks how many files are found gXf_~zxS  
        Dim fCount As Long \,(tP:o  
        fCount = 0 u1<xt1K  
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        'Recurse directory and search for text files 8q0f#/`v  
        Dim f As String m"v` E7G  
        f = Dir$(in_dir & "*.txt") g%\e80~1(  
        While f <> "" ;$0za]x  
            ReDim Preserve in_flist(fCount) "@ox=  
            in_flist(fCount) = f ^?juY}rZ=|  
            fCount += 1 T!;<Fy"p  
            f = Dir$() }1$8)zH  
        Wend Ex*g>~e  
        ReDim Preserve in_flist(fCount-1) ,e>ugI_;*  
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    End Sub "4r5n8  
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