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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 ,GdxUld  
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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 '+)6#/*  
    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。 ^#a#<8Jz  
    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。 9l]UE0yTL/  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 !pd7@FwC  
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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。 SjZd0H0  
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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) (A7T}znG  
    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 "_ nX5J9  
    例如下所示: Mq+viU&   
    Sample name:  EDF-C1-56 tpv?`(DDU  
    Merging data from file EDF-C1-56 0-0.txt ox(*  
    Finished merging RPC data for sample EDF-C1-56 pu\b`3C(  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt |x1$b 7  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 fl!mYCPv  
    a. 创建一个新的散射库 7ZF}0K$^B  
    b. 散射模型命名 <h'8w  
    c. 改变散射模型为“Tabulated BSDF”. &tlR~?$e*  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) I?f"<5[0  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 !&@2  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 CMC?R,d  
    g. 点击OK tH-gaDj_  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 k TFz_*6.  
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    脚本代码 LTg?5GwD\j  
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    '#Language "WWB-COM" YH6snC$u  
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    Option Explicit  ]a78tTi  
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    Sub Main c eqFQ  
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        'Cleanup WEno+Z~=1'  
        ClearOutputWindow() ^it4z gx@  
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        Print "Merging RPC Photonics BSDF Data Files" V78Mq:7d  
        SetTextColor(255,0,0) g;$E1U=R-E  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." w+Ad$4Pf"  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ^%-NPo<  
        SetTextColor(0,0,0) )URwIe{  
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        'Current directory of this script (should be the same as the text files being merged) ?(]a*~rx  
        Dim cDir As String C#Y,r)l  
        cDir = MacroDir$ & "\" 6!*K/2:O  
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        'Array which will be populated with the list of files to be merged K3Huu!Tr  
        Dim fList() As String, curFile As String Q%rVo4M#2  
        GetFileList( cDir, fList ) 7TP$  
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        Print "" bSQ_"  
        Print "Files found for merging:" >Ja0hS{*  
        For Each curFile In fList &u&2D$K,tp  
            Print Chr(9) & curFile n1_ %Td  
        Next A8J?A#R*{q  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. IT,"8 s  
        Dim nameArray() As String, sampName As String g .3f2w  
        nameArray = Split(fList(0)," 0-0.txt") JAN|aCzD  
        sampName  = nameArray(0) %?@x]B9Y8E  
        Print "" bG52s  
        Print "Sample name: " & Chr(9) & sampName tAaYL \~  
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        'Open an output file and write the FRED header data `Rrr>vj  
        Dim outFile As String W^wd ([  
        outFile = cDir & sampName & "_FRED.txt" OO$|9`a  
        Open outFile For Output As #1 :#qUMiu$  
        Print #1, "type bsdf_data" ? %93b ,7  
        Print #1, "format angles=deg bsdf=value scale=1" JW-|<CJ  
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        'Loop the file list, skip the two header lines and write the remaining data to file ?b5H 2 W  
        Dim lineArray() As String, curLine As Long FWIih5 3`  
        For Each curFile In fList /=bSt  
            Print "Merging data from file " & curFile AYt*'Zeg!s  
            ReadFile( cDir & curFile, lineArray ) q Z#!CPHS  
            For curLine = 2 To UBound(lineArray) }lH;[+u3  
                Print #1, lineArray(curLine) (s&ORoVGn  
            Next >;m{{nj  
        Next {Wh BoD  
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        'Close the output file iW'_R{)T  
        Close #1 t~q?lT  
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        Print "Finished merging RPC data for sample " & sampName $-Cy  
        Print "FRED formatted data file: " & Chr(9) & outFile kw3 +>{\  
    End Sub rj}(muM,R  
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    'Utility function to read the contents of a file into an array of strings. WBa /IM   
    Function ReadFile(ByVal fileName As String, _ _$!`VA%  
                      ByRef lineArray() As String) As Long CNq[4T'~A  
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        ReadFile = -1 !h?=Wv ==]  
        Dim oFSO As Object Q~8y4=|#CY  
        Set oFSO = CreateObject("Scripting.FileSystemObject") QOd!]*W`?m  
        Erase lineArray v3~FR,Kl  
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        Dim fid As Long  K,6OGsh  
        If oFSO.fileexists( fileName ) Then 9Kx<\)-GMD  
            fid = FreeFile() @bE~@4mOu  
            Open fileName For Input As fid $ND90my  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) b1 H7  
            Close fid gXF.on4B  
        End If uQWp+}>ZJy  
        Set oFSO = Nothing ERp{gB2U?  
        Return UBound( lineArray ) (xbIUz.  
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    End Function ;|;iCaD a+  
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    Sub GetFileList( ByVal in_dir As String, _ Wy8,<K{  
                     ByRef in_flist() As String ) UUGe"]V^g:  
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        'Redimension the file list array K\~v&  
        Erase in_flist q P'[&h5Y  
    ] ;&"1A  
        'Tracks how many files are found sSz%V[X WL  
        Dim fCount As Long =D}4X1l  
        fCount = 0 brfKd]i  
    {!MVc<G.  
        'Recurse directory and search for text files YQ+^  
        Dim f As String P sp^@  
        f = Dir$(in_dir & "*.txt") e+l\\9v  
        While f <> "" v[smQO  
            ReDim Preserve in_flist(fCount) Ajg\aof0{  
            in_flist(fCount) = f #%4=)M>^  
            fCount += 1 (2d3jQN`  
            f = Dir$() ![).zi+m  
        Wend o_(0  
        ReDim Preserve in_flist(fCount-1) %6Rn4J^^  
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    End Sub IqNpLh|[  
     
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