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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
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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 e,1u  
    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。 h+7>#*DH  
    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。 *=F(KZ  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤  NY  
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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。 5rxA<G s  
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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) EYS>0Y  
    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 P1kB>" bR  
    例如下所示: A/*%J74v  
    Sample name:  EDF-C1-56 #~ v4caNx  
    Merging data from file EDF-C1-56 0-0.txt BuQ|~V  
    Finished merging RPC data for sample EDF-C1-56 Jcf"#u-Q/  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt $+= <(*  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 JyBp-ii  
    a. 创建一个新的散射库 - Xupq/[,  
    b. 散射模型命名 !R{R??  
    c. 改变散射模型为“Tabulated BSDF”. *b(wVvz  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ?2J?XS>  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 T`YwJ6N  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 H -t|i  
    g. 点击OK hXL|22>w<  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 oY9FK{  
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    脚本代码 :Hy]  
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    '#Language "WWB-COM" Rs;15@t@  
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    Option Explicit xh9qg0d  
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    Sub Main 3!9 Z=- tD  
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        'Cleanup |^n3{m  
        ClearOutputWindow() AHh#Fx+K  
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        Print "Merging RPC Photonics BSDF Data Files" Zc5 :]]  
        SetTextColor(255,0,0) ,{}#8r`+*  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." J\co1kO9/  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." _GaJXWMbk  
        SetTextColor(0,0,0) , |E$'  
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        'Current directory of this script (should be the same as the text files being merged) :R6Q=g=  
        Dim cDir As String C".1+Um  
        cDir = MacroDir$ & "\" 6 vs3O  
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        'Array which will be populated with the list of files to be merged kyUl{Zj  
        Dim fList() As String, curFile As String Buc_9Kzw<+  
        GetFileList( cDir, fList ) o+?@5zw -&  
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        Print "" +++pI.>(*Q  
        Print "Files found for merging:" 6qp5Xt+  
        For Each curFile In fList L10IF  
            Print Chr(9) & curFile QJ X/7RA  
        Next p]|LV)R n  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ? Nj)6_&  
        Dim nameArray() As String, sampName As String /XpSe<3  
        nameArray = Split(fList(0)," 0-0.txt") M@7Xp)S"  
        sampName  = nameArray(0) pA4 ,@O  
        Print "" ocA]M=3~k  
        Print "Sample name: " & Chr(9) & sampName "~+.Af  
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        'Open an output file and write the FRED header data fj']?a!m  
        Dim outFile As String .Ao0;:;(2-  
        outFile = cDir & sampName & "_FRED.txt" !vqC+o>@  
        Open outFile For Output As #1 LsTffIP  
        Print #1, "type bsdf_data" s@@1 *VQ  
        Print #1, "format angles=deg bsdf=value scale=1" R{}qK r  
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        'Loop the file list, skip the two header lines and write the remaining data to file I 48VNX  
        Dim lineArray() As String, curLine As Long J\`^:tcG  
        For Each curFile In fList mUXk9X%n  
            Print "Merging data from file " & curFile Gp2!xKgm  
            ReadFile( cDir & curFile, lineArray ) x7ATI[b[  
            For curLine = 2 To UBound(lineArray) =4NqjSH  
                Print #1, lineArray(curLine) Xa,&ef&q  
            Next S`g;Y '  
        Next szq+@2:  
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        'Close the output file #BJ\{"b_}z  
        Close #1  H!eh J$[  
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        Print "Finished merging RPC data for sample " & sampName ;sQbn|=e"  
        Print "FRED formatted data file: " & Chr(9) & outFile "kSwa16O  
    End Sub 4M`Xrfwm'[  
    __\P`S_  
    'Utility function to read the contents of a file into an array of strings. qu{mqkfN>  
    Function ReadFile(ByVal fileName As String, _ K8Zt:yP  
                      ByRef lineArray() As String) As Long P[i\e7mR  
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        ReadFile = -1 :YvbU Y  
        Dim oFSO As Object ;93KG4a  
        Set oFSO = CreateObject("Scripting.FileSystemObject") O% $O(l  
        Erase lineArray %$n02"@  
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        Dim fid As Long OgMI  
        If oFSO.fileexists( fileName ) Then 2VYvO=KA  
            fid = FreeFile() gxM[V>[  
            Open fileName For Input As fid #+G`!<7/@f  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) n`<S&KP|  
            Close fid myvh@@N  
        End If j%xBo:  
        Set oFSO = Nothing 9k `~x1Y)  
        Return UBound( lineArray ) qx%jAs+~  
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    End Function fValSQc!U  
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    Sub GetFileList( ByVal in_dir As String, _ %V_eJC""?  
                     ByRef in_flist() As String ) wRbw  
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        'Redimension the file list array fN[n>%)VO<  
        Erase in_flist R}k69-1vL  
    =J3`@9;  
        'Tracks how many files are found _S5gcPcF"  
        Dim fCount As Long G8P+A1 f/>  
        fCount = 0 K%2I  
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        'Recurse directory and search for text files Xw(3j)xQ  
        Dim f As String /0\QL+^!  
        f = Dir$(in_dir & "*.txt") BE4\U_]a3  
        While f <> "" ;,`]O!G:P  
            ReDim Preserve in_flist(fCount) hAAUecx  
            in_flist(fCount) = f G"Pj6QUva  
            fCount += 1 e6m1NH4,  
            f = Dir$() lC{L6&T  
        Wend ~XQ$aRl&  
        ReDim Preserve in_flist(fCount-1) 5"2@NL  
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    End Sub y:9?P~  
     
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