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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 H,\c"  
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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 %VwB ?  
    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。 S&]JY  
    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。 r]8B6iV  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Nf$Y-v?i  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 P= S)V   
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ch< zpo:  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 Oys.8%+ P  
    例如下所示: YF."D%?  
    Sample name:  EDF-C1-56 i 5-V$Qh  
    Merging data from file EDF-C1-56 0-0.txt wd1*wt  
    Finished merging RPC data for sample EDF-C1-56 46$u}"E  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 2-{8+*_'  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 =D3Y q?  
    a. 创建一个新的散射库 W]rXt,{ &  
    b. 散射模型命名 FUHa"$Bg  
    c. 改变散射模型为“Tabulated BSDF”. =0m[  
    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 ) Z0E+EMo  
    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。 ayC*n'  
    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 gS"@P:wYzs  
    g. 点击OK (/FPGYu3h  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 s7&% _!4  
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    脚本代码 ?(ks=rRK  
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    '#Language "WWB-COM" 2Ie50U  
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    Option Explicit q9!5J2P  
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    Sub Main ,`H=%#  
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        'Cleanup ( 6r9y3'  
        ClearOutputWindow() @ZT25CD  
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        Print "Merging RPC Photonics BSDF Data Files" M0_K%Z(zaR  
        SetTextColor(255,0,0) >5]Xl*{H)  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." x}F.<`  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 7E|0'PPR  
        SetTextColor(0,0,0) l*%?C*  
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        'Current directory of this script (should be the same as the text files being merged) ym1TGeFAq  
        Dim cDir As String E<~/AReo  
        cDir = MacroDir$ & "\" #<se0CJB  
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        'Array which will be populated with the list of files to be merged (<1DPpy95O  
        Dim fList() As String, curFile As String LscAsq<H<  
        GetFileList( cDir, fList ) (-"A5(X:/  
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        Print "" Gb~q:&IUr  
        Print "Files found for merging:" 62Jn8DwAT  
        For Each curFile In fList IK}T. *[  
            Print Chr(9) & curFile i?|K+"=D  
        Next mflI>J=g  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. hW/*]7AM^  
        Dim nameArray() As String, sampName As String E1VCm[j2  
        nameArray = Split(fList(0)," 0-0.txt") l;?.YtMg  
        sampName  = nameArray(0) $\a;?>WA"  
        Print "" Kji}2j'a  
        Print "Sample name: " & Chr(9) & sampName l:faI&o.@  
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        'Open an output file and write the FRED header data /mr&Y}7T  
        Dim outFile As String c*\^6 1T  
        outFile = cDir & sampName & "_FRED.txt" K$(U>D|  
        Open outFile For Output As #1 {\0R[+d  
        Print #1, "type bsdf_data" 8t6h^uQ  
        Print #1, "format angles=deg bsdf=value scale=1" nPv2: x  
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        'Loop the file list, skip the two header lines and write the remaining data to file oNiS"\t  
        Dim lineArray() As String, curLine As Long o AQ92~b  
        For Each curFile In fList G+5G,|}  
            Print "Merging data from file " & curFile xD_jfAH'  
            ReadFile( cDir & curFile, lineArray ) 6W#+U<  
            For curLine = 2 To UBound(lineArray) ifBJ$x(B.  
                Print #1, lineArray(curLine) 5[*MT%ms  
            Next kZn!]TseN  
        Next MjG .Ili$m  
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        'Close the output file rj{'X  /  
        Close #1 gXf_~zxS  
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        Print "Finished merging RPC data for sample " & sampName u1<xt1K  
        Print "FRED formatted data file: " & Chr(9) & outFile $p9XXZ"*  
    End Sub 8q0f#/`v  
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    'Utility function to read the contents of a file into an array of strings. r3*wH1n  
    Function ReadFile(ByVal fileName As String, _ Jl^oDW  
                      ByRef lineArray() As String) As Long eyo)Su  
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        ReadFile = -1 dxASU|Yo9  
        Dim oFSO As Object [;X YT  
        Set oFSO = CreateObject("Scripting.FileSystemObject") @MN>ye'T  
        Erase lineArray j*6!7u.,K  
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        Dim fid As Long zV2c `he%z  
        If oFSO.fileexists( fileName ) Then 4CN8>J'-  
            fid = FreeFile() ? X:RrZ:/  
            Open fileName For Input As fid Q"Bgr&RJ  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ,*C^ixNE  
            Close fid 1,pg:=N9  
        End If OB"QWdh  
        Set oFSO = Nothing Um9=<*p  
        Return UBound( lineArray ) |E?%Cj^W  
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    End Function fnXl60C%  
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    Sub GetFileList( ByVal in_dir As String, _ ^Jkj/n'  
                     ByRef in_flist() As String ) o/&:w z  
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        'Redimension the file list array ^Xb!dnT.*a  
        Erase in_flist huR<+ =!  
    '.^JN@  
        'Tracks how many files are found | _S9U|  
        Dim fCount As Long HX <;=m  
        fCount = 0 16aaIK  
    *}2o \h6Q  
        'Recurse directory and search for text files /\\C&Px  
        Dim f As String Xt~/8)&  
        f = Dir$(in_dir & "*.txt") B! -W765Y  
        While f <> "" g.9MPN  
            ReDim Preserve in_flist(fCount) LLU>c]a  
            in_flist(fCount) = f OPjscc5  
            fCount += 1 p]aIMF_  
            f = Dir$() h?CNChRJs  
        Wend ?j OpW1  
        ReDim Preserve in_flist(fCount-1) l_kH^ET  
    }Rf } iG  
    End Sub X0C\87xfG  
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