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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 _~q^YZ  
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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}FF4jE]D(  
    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。 DL!s)5!M  
    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。 0x/V1?gm  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 54j $A  
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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。 W >IKy#  
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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) e|9Bzli{  
    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 ne*aC_)bT  
    例如下所示: ] CE2/6Ph  
    Sample name:  EDF-C1-56 P.J}\;S T  
    Merging data from file EDF-C1-56 0-0.txt 3yX^R^`  
    Finished merging RPC data for sample EDF-C1-56 P#1y  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt En_8H[<%  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 tqf-,BLh  
    a. 创建一个新的散射库 "n-xsAG  
    b. 散射模型命名 "t`e68{Ls  
    c. 改变散射模型为“Tabulated BSDF”. /qze  
    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 ) 0zNS;wvv&  
    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。 x;aZ&  
    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 hlEvL  
    g. 点击OK ^i 7a2< z  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Q{kuB+s  
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    脚本代码 9V!K. _Cb  
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    '#Language "WWB-COM" zg"ZXZ  
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    Option Explicit %"V,V3kw4  
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    Sub Main XA%?35v~  
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        'Cleanup b,`N;*  
        ClearOutputWindow() >cLZP#^\2E  
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        Print "Merging RPC Photonics BSDF Data Files" ibL;99#  
        SetTextColor(255,0,0) `R;XN-  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." m0YDO 0  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." tzPe*|m<  
        SetTextColor(0,0,0) ?y kIi/  
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        'Current directory of this script (should be the same as the text files being merged) cl5:|)  
        Dim cDir As String 5j %jhby?  
        cDir = MacroDir$ & "\" c-{]H8$v  
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        'Array which will be populated with the list of files to be merged *}=W wG  
        Dim fList() As String, curFile As String yR-.OF,c  
        GetFileList( cDir, fList ) 7IR n  
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        Print "" Zs)9O Ju  
        Print "Files found for merging:" NKN!X/P  
        For Each curFile In fList lC{m;V2  
            Print Chr(9) & curFile eS M!_2  
        Next Z~<V>b  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. f.WtD`Oas  
        Dim nameArray() As String, sampName As String  `!BUd  
        nameArray = Split(fList(0)," 0-0.txt") DzMkeX  
        sampName  = nameArray(0) GfV9Ox   
        Print "" 7P]pk=mo  
        Print "Sample name: " & Chr(9) & sampName L;;x%>  
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        'Open an output file and write the FRED header data z> SCv;Q  
        Dim outFile As String B Xp3u|t  
        outFile = cDir & sampName & "_FRED.txt" w*x}4wW  
        Open outFile For Output As #1 $U1'n@/J  
        Print #1, "type bsdf_data" 9dAsXEWh  
        Print #1, "format angles=deg bsdf=value scale=1" i "xq SLf=  
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        'Loop the file list, skip the two header lines and write the remaining data to file 1Y_fX  
        Dim lineArray() As String, curLine As Long !G37K8 &&*  
        For Each curFile In fList . x$` i  
            Print "Merging data from file " & curFile gxiJ`. D=  
            ReadFile( cDir & curFile, lineArray ) j"]%6RwM]  
            For curLine = 2 To UBound(lineArray) ;6Z?O_zp4  
                Print #1, lineArray(curLine) |?8wyP  
            Next #&^+hx|  
        Next Wp ]u0w  
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        'Close the output file `|4{|X*U.  
        Close #1 -HOCxR  
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        Print "Finished merging RPC data for sample " & sampName am=56J$ig  
        Print "FRED formatted data file: " & Chr(9) & outFile 5|Uub ,  
    End Sub 3N-(`[m{E  
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    'Utility function to read the contents of a file into an array of strings. Nt)9- \T  
    Function ReadFile(ByVal fileName As String, _ E yuc~[  
                      ByRef lineArray() As String) As Long 1FuChd  
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        ReadFile = -1 aLr^uce]  
        Dim oFSO As Object 4o_1F).\D  
        Set oFSO = CreateObject("Scripting.FileSystemObject") M30_b8[Y_  
        Erase lineArray ;YB8X&H$  
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        Dim fid As Long @{j-B IRZ0  
        If oFSO.fileexists( fileName ) Then K_xn>  
            fid = FreeFile() ls=<c<  
            Open fileName For Input As fid U6{ RHS[  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0\/7[nwS  
            Close fid d(&vIjy  
        End If TYp{nWwi  
        Set oFSO = Nothing nV'B!q  
        Return UBound( lineArray ) sM4N`$Is23  
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    End Function "l!"gc87  
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    Sub GetFileList( ByVal in_dir As String, _ oY{*X6:6<  
                     ByRef in_flist() As String ) Wd[XQZ<  
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        'Redimension the file list array {T$;BoR#O  
        Erase in_flist Cnc77EUD  
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        'Tracks how many files are found bw@tA7Y  
        Dim fCount As Long 371E S4  
        fCount = 0 ^s%Qt  
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        'Recurse directory and search for text files NKd):>d%  
        Dim f As String RgEUTpX  
        f = Dir$(in_dir & "*.txt") GU!|J71z  
        While f <> "" n32?GRp  
            ReDim Preserve in_flist(fCount) ]TGJ|X  
            in_flist(fCount) = f }L@YLnc%  
            fCount += 1 A:N!H_x  
            f = Dir$() UF}fmDi  
        Wend <F&S   
        ReDim Preserve in_flist(fCount-1) &%^[2^H8"  
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    End Sub |>VHV} 4)<  
     
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