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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 Vw~st1",[  
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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 )>X C_ R  
    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。 l2lyi  
    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。 #@cOyxUt  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ~s[St0  
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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 nxxW?  
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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) w '<8l w  
    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 F}C.F  
    例如下所示: 2VgDM6h  
    Sample name:  EDF-C1-56 X4bB  
    Merging data from file EDF-C1-56 0-0.txt 8FmRD  
    Finished merging RPC data for sample EDF-C1-56 .e,(}_[[<  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt S.#IC lV  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 `]q>A']Dl  
    a. 创建一个新的散射库 NPFrn[M$  
    b. 散射模型命名 f L}3I(VK  
    c. 改变散射模型为“Tabulated BSDF”. d;-/F b{4  
    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 ) j18qY4Gw)  
    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。 pFZ2(b&  
    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 a1 I"Sh  
    g. 点击OK >Wbt_%dKy  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 #go!"H L  
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    脚本代码 V:wx@9m)  
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    '#Language "WWB-COM" v p>,}nx4  
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    Option Explicit =(-oQ<@v  
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    Sub Main 4%]wd}'#Un  
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        'Cleanup oOU?6nq  
        ClearOutputWindow() 0)?.rthk4S  
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        Print "Merging RPC Photonics BSDF Data Files" 8)1 k>=  
        SetTextColor(255,0,0) k$u/6lw]IB  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ;Rz+4<  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." S5W*,?  
        SetTextColor(0,0,0) [ ; $(;  
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        'Current directory of this script (should be the same as the text files being merged) u$"dL=s!  
        Dim cDir As String has \W\(  
        cDir = MacroDir$ & "\" C XZO  
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        'Array which will be populated with the list of files to be merged T/A[C  
        Dim fList() As String, curFile As String TCC([  
        GetFileList( cDir, fList ) qNH= W?T8.  
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        Print "" CfSpwkg  
        Print "Files found for merging:" %s^2m"ca}=  
        For Each curFile In fList .sO.Y<- fl  
            Print Chr(9) & curFile h]DS$WZ  
        Next _aR_ [  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ncGg@$E  
        Dim nameArray() As String, sampName As String ?_!} lg  
        nameArray = Split(fList(0)," 0-0.txt") " wB~*,Ny  
        sampName  = nameArray(0) \KGi54&Y  
        Print "" g^V4+3v|a'  
        Print "Sample name: " & Chr(9) & sampName Ed(6%kd  
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        'Open an output file and write the FRED header data h7}D//~p  
        Dim outFile As String &at^~ o  
        outFile = cDir & sampName & "_FRED.txt" =lE_ Q[P  
        Open outFile For Output As #1 ZW6ZO[`6  
        Print #1, "type bsdf_data"  &Ow[  
        Print #1, "format angles=deg bsdf=value scale=1" VdVUYp  
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        'Loop the file list, skip the two header lines and write the remaining data to file J`&*r;""V  
        Dim lineArray() As String, curLine As Long e~NEyS~3  
        For Each curFile In fList O,&nCxB]  
            Print "Merging data from file " & curFile |Sne\N>%  
            ReadFile( cDir & curFile, lineArray ) &L88e\ c+  
            For curLine = 2 To UBound(lineArray) :r{;'[38  
                Print #1, lineArray(curLine) aCq ) hR  
            Next wRa$b  
        Next yc#0c[ZQu  
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        'Close the output file gJkk0wok C  
        Close #1 lk$@8h$vS  
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        Print "Finished merging RPC data for sample " & sampName Fp_?1 y  
        Print "FRED formatted data file: " & Chr(9) & outFile 3X0"</G6  
    End Sub <6 LpsM}  
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    'Utility function to read the contents of a file into an array of strings. $IM}d"/9  
    Function ReadFile(ByVal fileName As String, _ qmWK8}F.cE  
                      ByRef lineArray() As String) As Long 69z,_p$@:  
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        ReadFile = -1 YA";&|V  
        Dim oFSO As Object q_h=O1W  
        Set oFSO = CreateObject("Scripting.FileSystemObject") M<4tjVQ6  
        Erase lineArray p~n62(  
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        Dim fid As Long z1-JoZ  
        If oFSO.fileexists( fileName ) Then i'[o,dbE  
            fid = FreeFile() gPo3jwo$  
            Open fileName For Input As fid j9V*f HK  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) R-L*N$@!  
            Close fid J%Cn  
        End If `t@Rh~B  
        Set oFSO = Nothing bJ~@ k,'  
        Return UBound( lineArray ) 7$z]oVbO'  
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    End Function 8?YWE62  
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    Sub GetFileList( ByVal in_dir As String, _ O&]P u5  
                     ByRef in_flist() As String ) }i)^?@  
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        'Redimension the file list array U_X/  
        Erase in_flist l8$7N=Y  
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        'Tracks how many files are found (jV_L 1D  
        Dim fCount As Long "_g3{[es!  
        fCount = 0 Za*QX|  
    )kBN]>&R  
        'Recurse directory and search for text files l"C)Ia&/  
        Dim f As String ;Q1/53Y<  
        f = Dir$(in_dir & "*.txt") <b5J"i&m  
        While f <> "" /^m3?q[a  
            ReDim Preserve in_flist(fCount) YH:murJMZ  
            in_flist(fCount) = f yY 3Mv/R  
            fCount += 1 i*T>, z  
            f = Dir$() )[w_LHKI  
        Wend xE[CNJ%t^,  
        ReDim Preserve in_flist(fCount-1) +2ZBj6 e9  
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    End Sub R*DQm  
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