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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 ^k J>4  
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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 i1dE.f ;  
    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。 Phq"A[4=O  
    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。 Uv)B  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 1R.|j_HYy  
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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。 *q&^tn b  
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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) lxsn(- j  
    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 ;~,)6UX7  
    例如下所示: P9 w);jp;  
    Sample name:  EDF-C1-56 N T>[ 2<  
    Merging data from file EDF-C1-56 0-0.txt Nn#;Kjul.  
    Finished merging RPC data for sample EDF-C1-56 iV5S[uy72.  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt u']}Z% A9`  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 m)l'i!Y  
    a. 创建一个新的散射库 Np"~1z.(b  
    b. 散射模型命名 I:6H65(&  
    c. 改变散射模型为“Tabulated BSDF”. &>f]  
    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 ) J ?0P{{  
    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@9#7Obu  
    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 8,@0~2fz#  
    g. 点击OK y[{}124  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 CzDV^Iv;Q{  
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    脚本代码 V]Rt[l]  
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    '#Language "WWB-COM" WES$B7y  
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    Option Explicit (u4'*[o\t  
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    Sub Main I@oSRB  
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        'Cleanup <v6W l\  
        ClearOutputWindow() ~8&P*oFC  
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        Print "Merging RPC Photonics BSDF Data Files" _lDNYpv  
        SetTextColor(255,0,0) K&VMhMVb  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." =w!2R QB  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." !k Heslvi  
        SetTextColor(0,0,0) Hqtv`3g  
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        'Current directory of this script (should be the same as the text files being merged) <naxpflom0  
        Dim cDir As String [<|$If99\  
        cDir = MacroDir$ & "\" sd%m{P2  
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        'Array which will be populated with the list of files to be merged Y(u`K=*  
        Dim fList() As String, curFile As String nAC>']K4$  
        GetFileList( cDir, fList ) iR"6VO  
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        Print "" &hUEOif  
        Print "Files found for merging:" y=0)vi{]  
        For Each curFile In fList "ql$Rz8  
            Print Chr(9) & curFile F9"Xu-g  
        Next I7W`\d)  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. lMl'+ yy  
        Dim nameArray() As String, sampName As String \Q^grX  
        nameArray = Split(fList(0)," 0-0.txt") 3Vbt(K  
        sampName  = nameArray(0) 18Vn[}]"  
        Print "" "@^Q" RF  
        Print "Sample name: " & Chr(9) & sampName @+0dgkJ  
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        'Open an output file and write the FRED header data S['cX ~  
        Dim outFile As String .C.b5x!  
        outFile = cDir & sampName & "_FRED.txt" W~PMR/^i  
        Open outFile For Output As #1 P4zwTEk`  
        Print #1, "type bsdf_data" k }{o: N  
        Print #1, "format angles=deg bsdf=value scale=1" \H9:%Tlp~4  
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        'Loop the file list, skip the two header lines and write the remaining data to file `8r$b/6  
        Dim lineArray() As String, curLine As Long !"o\H(siT  
        For Each curFile In fList ,!,tU7-H  
            Print "Merging data from file " & curFile sH>`eqY  
            ReadFile( cDir & curFile, lineArray ) =~"X/ >'  
            For curLine = 2 To UBound(lineArray) %ZcS"/gf  
                Print #1, lineArray(curLine) (S4HU_,88  
            Next @lq)L  
        Next Ex Q\qp3  
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        'Close the output file C_'EO<w$  
        Close #1 jABFdNjri  
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        Print "Finished merging RPC data for sample " & sampName ( et W4p  
        Print "FRED formatted data file: " & Chr(9) & outFile 93Zij<bH?e  
    End Sub [2YPV\=  
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    'Utility function to read the contents of a file into an array of strings. ~ g-(  
    Function ReadFile(ByVal fileName As String, _ 0b/@QgJ  
                      ByRef lineArray() As String) As Long LF @_|o I  
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        ReadFile = -1 7r50y>  
        Dim oFSO As Object OrYN-A4{  
        Set oFSO = CreateObject("Scripting.FileSystemObject") V2|By,.  
        Erase lineArray C/QmtT~`e  
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        Dim fid As Long Mk0x#-F  
        If oFSO.fileexists( fileName ) Then nF_q{e7  
            fid = FreeFile() 8{QCW{K  
            Open fileName For Input As fid -8Hc M\b  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) `U b*rOMu  
            Close fid I`*5z;Q!%@  
        End If 4'=Q:o*w`  
        Set oFSO = Nothing <i4]qO(0u  
        Return UBound( lineArray ) ^EKRbPA9:<  
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    End Function Vfga%K%l F  
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    Sub GetFileList( ByVal in_dir As String, _ 6T|Z4f|  
                     ByRef in_flist() As String ) g1|Py t{  
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        'Redimension the file list array ;ne`ppz0  
        Erase in_flist Pc=ei  
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        'Tracks how many files are found 4sntSlz)~k  
        Dim fCount As Long !'~Ldl  
        fCount = 0 ap'La|9t>  
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        'Recurse directory and search for text files sT"ICooc  
        Dim f As String l^}u S|c(  
        f = Dir$(in_dir & "*.txt") ||Owdw|{  
        While f <> "" < K!r\^  
            ReDim Preserve in_flist(fCount) 1U#W=Fg'  
            in_flist(fCount) = f ;y. ;U#O  
            fCount += 1 qD4s?j-9  
            f = Dir$() yf0v,]v[  
        Wend Y JMs9X~3  
        ReDim Preserve in_flist(fCount-1) R6BbkYWrX  
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    End Sub wM4{\  f\  
     
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