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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 c M<08-:v  
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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 V@y&n1?6  
    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。 4M0p:Ey '  
    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。 X,lhVT |  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 "E4CQL'U  
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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-@&n6PEOZ  
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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) wSM(!:on5  
    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 AuM}L&`i^  
    例如下所示: A42!%>PB  
    Sample name:  EDF-C1-56 $Fi1Bv)  
    Merging data from file EDF-C1-56 0-0.txt (7&b)"y  
    Finished merging RPC data for sample EDF-C1-56 6#qt%t%?D  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^xScVOdP  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 >[nR$8_J-l  
    a. 创建一个新的散射库 ~e)"!r  
    b. 散射模型命名 GjN6Af~}  
    c. 改变散射模型为“Tabulated BSDF”. I#]pk!  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ~gQYgv<7  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 E{^W-  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 @.)[U:N  
    g. 点击OK :AQ9-&i/a-  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 u"wWekB  
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    脚本代码 c4Q9foE   
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    '#Language "WWB-COM"  !I&,!$  
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    Option Explicit U 9Ea }aN  
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    Sub Main 'mm>E  
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        'Cleanup A>mk0P)~Q  
        ClearOutputWindow() cF EO}  
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        Print "Merging RPC Photonics BSDF Data Files" 8<ev5af  
        SetTextColor(255,0,0) 8^_e>q*W  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Lm<WT*@  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." =[Z3]#h  
        SetTextColor(0,0,0) @SaxM4  
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        'Current directory of this script (should be the same as the text files being merged) ^ uwth  
        Dim cDir As String 3zc;_U2  
        cDir = MacroDir$ & "\" yh|+Usa  
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        'Array which will be populated with the list of files to be merged CvEIcm=t  
        Dim fList() As String, curFile As String $b7@S`5  
        GetFileList( cDir, fList ) ,&fZo9J9  
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        Print "" {gD`yoPrV  
        Print "Files found for merging:" K:Z(jF!j  
        For Each curFile In fList nqTOAL9FF  
            Print Chr(9) & curFile {9Ok^O  
        Next knpdECq&k  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. z!.cc6R  
        Dim nameArray() As String, sampName As String F!4V!VWA}  
        nameArray = Split(fList(0)," 0-0.txt") hd(TKFL^y  
        sampName  = nameArray(0) a<E9@  
        Print "" Dbq/t^  
        Print "Sample name: " & Chr(9) & sampName .!i`YT*jF  
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        'Open an output file and write the FRED header data 7|_2@4-W6  
        Dim outFile As String o-AF_N  
        outFile = cDir & sampName & "_FRED.txt" e{XzUY6  
        Open outFile For Output As #1 JR&yaOws  
        Print #1, "type bsdf_data" ">20`Mj8  
        Print #1, "format angles=deg bsdf=value scale=1" p&)d]oV>  
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        'Loop the file list, skip the two header lines and write the remaining data to file yx*<c#Uf  
        Dim lineArray() As String, curLine As Long Of$R+n.  
        For Each curFile In fList \IudS{ .?;  
            Print "Merging data from file " & curFile \j BA4?(S  
            ReadFile( cDir & curFile, lineArray ) a'n17d&  
            For curLine = 2 To UBound(lineArray) CPeu="[  
                Print #1, lineArray(curLine) oe3=QE  
            Next I_N:j,Mx  
        Next >ZeARCf"f  
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        'Close the output file K@*4=0  
        Close #1 ~t$ng l$  
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        Print "Finished merging RPC data for sample " & sampName dxH\H?NO  
        Print "FRED formatted data file: " & Chr(9) & outFile .5s^a.e'O  
    End Sub h;y}g/HZ  
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    'Utility function to read the contents of a file into an array of strings. V\e1NS  
    Function ReadFile(ByVal fileName As String, _ ,S<) )  
                      ByRef lineArray() As String) As Long )l! `k  
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        ReadFile = -1 /`nkz  
        Dim oFSO As Object -Lb7=98  
        Set oFSO = CreateObject("Scripting.FileSystemObject") j(K)CHH  
        Erase lineArray & BY\h:  
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        Dim fid As Long [F;\NJp6?^  
        If oFSO.fileexists( fileName ) Then Oo FMOlb.Z  
            fid = FreeFile() \7#w@3*  
            Open fileName For Input As fid x2r.4  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ?$uF(>LD  
            Close fid  4~ L1~Gk  
        End If 3;wiwN'  
        Set oFSO = Nothing Q>9bKP  
        Return UBound( lineArray )  2+S+Y%~  
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    End Function #n15_cd  
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    Sub GetFileList( ByVal in_dir As String, _ }aI>dHL  
                     ByRef in_flist() As String ) YktZXc?iI<  
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        'Redimension the file list array nm]lPKU+Y  
        Erase in_flist @'GPZpbvZ  
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        'Tracks how many files are found Am*lx  
        Dim fCount As Long h x8pg,X  
        fCount = 0 LHu  
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        'Recurse directory and search for text files TX@ed  
        Dim f As String eH!V%dX  
        f = Dir$(in_dir & "*.txt") Bgzq  
        While f <> "" *//z$la  
            ReDim Preserve in_flist(fCount) *A8Et5HAv  
            in_flist(fCount) = f <sM_zoprc  
            fCount += 1 _*8 6  
            f = Dir$() _3wK: T{:  
        Wend q #7Nk)<.  
        ReDim Preserve in_flist(fCount-1) 5[r}'08b  
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    End Sub !b4AeiL>w  
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