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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 IJ; *N  
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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 ?miM15XI  
    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。 =L%3q<]p  
    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。 3G^Ed)JvE  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 "'Uk0>d=_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。 (_ah~VnO  
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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) ;4$C$r!t  
    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 bl_WN|SQ  
    例如下所示: PBtU4)  
    Sample name:  EDF-C1-56 S8m&Rj3O&  
    Merging data from file EDF-C1-56 0-0.txt KTt$Pt/.  
    Finished merging RPC data for sample EDF-C1-56 zD<9A6AB  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q%Q?q)x  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 uFZB8+  
    a. 创建一个新的散射库 X>7]g670@  
    b. 散射模型命名 [t{ #@X  
    c. 改变散射模型为“Tabulated BSDF”. 7"ps#)O  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) XWpnZFjE  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 E2'e}RQ  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 #%b()I_([  
    g. 点击OK ^]&{"!  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 [[h)4H{T  
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    脚本代码 5l0rw)  
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    '#Language "WWB-COM" es+_]:7B9  
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    Option Explicit <Cu?$  
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    Sub Main 5dw@g4N %^  
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        'Cleanup x*8f3^ wE  
        ClearOutputWindow() Juqn X  
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        Print "Merging RPC Photonics BSDF Data Files" yVQz<tX|  
        SetTextColor(255,0,0) Ej09RO"pB  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." g{)H" 8L  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Z !25xqNCd  
        SetTextColor(0,0,0) y6jmn1K  
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        'Current directory of this script (should be the same as the text files being merged) DPQGh`J  
        Dim cDir As String Bye@5D  
        cDir = MacroDir$ & "\" 8t: &#h  
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        'Array which will be populated with the list of files to be merged 'oZn<c`  
        Dim fList() As String, curFile As String vLFaZ^(  
        GetFileList( cDir, fList ) LiD |4(3  
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        Print "" 1 lCikS^c  
        Print "Files found for merging:" -s%-*K+,W  
        For Each curFile In fList 8Gl5)=2  
            Print Chr(9) & curFile 3hf ;4Mb  
        Next ro^6:w3O^  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. _7.GzQJ  
        Dim nameArray() As String, sampName As String gq_7_Y/  
        nameArray = Split(fList(0)," 0-0.txt") QC5f:BwM  
        sampName  = nameArray(0) GHC?Tp   
        Print "" ph12x: @B  
        Print "Sample name: " & Chr(9) & sampName P,;b'-5C  
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        'Open an output file and write the FRED header data C:GHP$/}  
        Dim outFile As String ?V)C9@bp  
        outFile = cDir & sampName & "_FRED.txt" MRg\FR 2>1  
        Open outFile For Output As #1 2C33;?M  
        Print #1, "type bsdf_data" $K.%un Gm  
        Print #1, "format angles=deg bsdf=value scale=1" }d3N`TT  
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        'Loop the file list, skip the two header lines and write the remaining data to file pG F5aF7T  
        Dim lineArray() As String, curLine As Long w^rb|mKo  
        For Each curFile In fList fJ&<iD)6  
            Print "Merging data from file " & curFile *JY`.t  
            ReadFile( cDir & curFile, lineArray ) 56=K@$L {F  
            For curLine = 2 To UBound(lineArray) akvwApn5  
                Print #1, lineArray(curLine) /=YqjZTCq  
            Next ZCE%38E N  
        Next nl-t<#z[  
    ;;w6b:}-c  
        'Close the output file WW [`E  
        Close #1 ELrZ8&5G  
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        Print "Finished merging RPC data for sample " & sampName 4&oXy,8LC  
        Print "FRED formatted data file: " & Chr(9) & outFile `mKlv~$1^  
    End Sub XAU_SPAjiw  
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    'Utility function to read the contents of a file into an array of strings. vpeBQ=2\  
    Function ReadFile(ByVal fileName As String, _ 9oj e`Ay  
                      ByRef lineArray() As String) As Long tFvgvx\:  
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        ReadFile = -1 x?f0Hk+  
        Dim oFSO As Object jW1YTQ  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ])QO%  
        Erase lineArray 4kaE}uKU  
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        Dim fid As Long BA1MGh  
        If oFSO.fileexists( fileName ) Then yxG:\y b  
            fid = FreeFile() ;-9zMbte :  
            Open fileName For Input As fid B%eDBu ")  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) z{`6#  
            Close fid A{4G@k+#d  
        End If j(Fa=pi  
        Set oFSO = Nothing d DIQ+/mmg  
        Return UBound( lineArray ) y|e2j&m  
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    End Function = GH@.3`X  
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    Sub GetFileList( ByVal in_dir As String, _ 6^] `-4*W  
                     ByRef in_flist() As String ) 192.W+H<  
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        'Redimension the file list array !@^y)v  
        Erase in_flist %\X P:  
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        'Tracks how many files are found W$JY M3!  
        Dim fCount As Long Z]x  5!  
        fCount = 0 !B [1zE  
    P1)* q0  
        'Recurse directory and search for text files HUU >hq9  
        Dim f As String IOsXPf9@  
        f = Dir$(in_dir & "*.txt") hF7V !*5  
        While f <> "" rV8(ia  
            ReDim Preserve in_flist(fCount) y3={NB+  
            in_flist(fCount) = f k_*XJ<S!Y  
            fCount += 1 I%;Rn:zl  
            f = Dir$() j<l#qho{h  
        Wend ->&BcPLn  
        ReDim Preserve in_flist(fCount-1) }.fL$,7a  
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    End Sub |`_ <@b  
     
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