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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 a?IL6$z  
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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 jF'azlT  
    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。  4^L+LY  
    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。 E6-alBi%  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 "/).:9],}  
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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。 -L/5Nbup  
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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) ")U`Wgx  
    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 `j59MSuK  
    例如下所示: \jdpL1  
    Sample name:  EDF-C1-56 wR;_x x  
    Merging data from file EDF-C1-56 0-0.txt 13]sZ([B%|  
    Finished merging RPC data for sample EDF-C1-56 4"e7 43(  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Cm;WQuv@  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,/\%-u? 1x  
    a. 创建一个新的散射库  ##7,  
    b. 散射模型命名 .Lrdw3(  
    c. 改变散射模型为“Tabulated BSDF”. f8E S GU  
    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 ) 1rV?^5  
    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。 ku*|?uF  
    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 ~BVg#_P  
    g. 点击OK n>X  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 vm+EzmO,!  
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    脚本代码 t_YiF%}s&#  
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    '#Language "WWB-COM" #Dx$KPD  
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    Option Explicit Mi\f?  
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    Sub Main 5|:=#Ql*  
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        'Cleanup -aGv#!aIl  
        ClearOutputWindow() MB\vgKY  
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        Print "Merging RPC Photonics BSDF Data Files" ^HKxaW9W  
        SetTextColor(255,0,0) L iJ;A*  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." LX j Tqp'  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." C+}uH:I'L  
        SetTextColor(0,0,0) K/Axojo  
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        'Current directory of this script (should be the same as the text files being merged) VLtb16|  
        Dim cDir As String !.iA^D//]  
        cDir = MacroDir$ & "\" mxjY-Kq  
    n$}c+1   
        'Array which will be populated with the list of files to be merged 9 4W9P't  
        Dim fList() As String, curFile As String 2o/}GIKj  
        GetFileList( cDir, fList ) 2P9hx5PiV  
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        Print "" G <m{o  
        Print "Files found for merging:" xJ%b<y{@  
        For Each curFile In fList \VPU)  
            Print Chr(9) & curFile g{l;v  
        Next dW!T.S  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. -BACdX  
        Dim nameArray() As String, sampName As String 1k l4X3q6  
        nameArray = Split(fList(0)," 0-0.txt") g<KBsz!{  
        sampName  = nameArray(0) L4S Fu.J'  
        Print "" [m!\ZK  
        Print "Sample name: " & Chr(9) & sampName 1h]Dc(Oc#=  
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        'Open an output file and write the FRED header data t ba%L  
        Dim outFile As String XXmtpM8  
        outFile = cDir & sampName & "_FRED.txt" nb22b Xt  
        Open outFile For Output As #1 I2|iqbX40Q  
        Print #1, "type bsdf_data" H@__%KBw  
        Print #1, "format angles=deg bsdf=value scale=1" 4jis\W}%L3  
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        'Loop the file list, skip the two header lines and write the remaining data to file suPQlU>2sj  
        Dim lineArray() As String, curLine As Long tTF/$`Q#*  
        For Each curFile In fList tb&{[|O^  
            Print "Merging data from file " & curFile kY xn5+~  
            ReadFile( cDir & curFile, lineArray ) >F,~QHcz  
            For curLine = 2 To UBound(lineArray) |? ?uVA)\X  
                Print #1, lineArray(curLine) ]Rnr>_>x;  
            Next <+sv7"a  
        Next ]t7<$L   
    rq}ew0&/  
        'Close the output file lh~!cOm\=E  
        Close #1 T\8|Q @  
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        Print "Finished merging RPC data for sample " & sampName GR O[&;d`  
        Print "FRED formatted data file: " & Chr(9) & outFile Gt\F),@  
    End Sub 04:^<n+{  
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    'Utility function to read the contents of a file into an array of strings. "+&|$*  
    Function ReadFile(ByVal fileName As String, _ \|DcWH1  
                      ByRef lineArray() As String) As Long D19uI&U4  
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        ReadFile = -1 FB6`2E%o  
        Dim oFSO As Object <G\q/!@_  
        Set oFSO = CreateObject("Scripting.FileSystemObject") #<4h Y7/  
        Erase lineArray h3>/..l  
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        Dim fid As Long t%q@W,2J  
        If oFSO.fileexists( fileName ) Then n/S1Hae`  
            fid = FreeFile() gAgzM?A1(  
            Open fileName For Input As fid J'b *^K  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) WJ=eV8Uk  
            Close fid {Z1j>h$  
        End If m}Kn!21  
        Set oFSO = Nothing Y%|f<C)lx2  
        Return UBound( lineArray ) 2m[z4V@`  
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    End Function gI'4g ZH  
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    Sub GetFileList( ByVal in_dir As String, _ MY4cMMjp~  
                     ByRef in_flist() As String ) /*`u(d2g  
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        'Redimension the file list array V ;1$FNR   
        Erase in_flist + Q}Y?([  
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        'Tracks how many files are found *s S7^OZ*  
        Dim fCount As Long *Jmy:C<>  
        fCount = 0 R4]t D|  
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        'Recurse directory and search for text files |.)oV;9  
        Dim f As String 2"c $#N  
        f = Dir$(in_dir & "*.txt") F%+/j5~^  
        While f <> "" $cSrT)u :  
            ReDim Preserve in_flist(fCount) \=XAl >}\  
            in_flist(fCount) = f }tua0{N:z  
            fCount += 1 SwV0q  
            f = Dir$() (@p E  
        Wend >ys>Q)  
        ReDim Preserve in_flist(fCount-1) Ym8G=KA  
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    End Sub @vCPX=c  
     
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