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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 VPqMbr"L[  
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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 #-Ad0/  
    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。 *.ZU" 5e  
    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。 <UMT:`h1MZ  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 :[ AP^  
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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。 dn)pVti_  
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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) b[_${in:  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 8${Yu  
    例如下所示: r9d dVD  
    Sample name:  EDF-C1-56 @ dF]X  
    Merging data from file EDF-C1-56 0-0.txt qTl/bFD  
    Finished merging RPC data for sample EDF-C1-56 Pqm)OZE?  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 3!V$fl0  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 q"Z!}^{  
    a. 创建一个新的散射库 Y?>us  
    b. 散射模型命名 _p`@/[(|  
    c. 改变散射模型为“Tabulated BSDF”. P.;S6i n  
    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 ) @\UoZv(  
    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。 \1p5$0z  
    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 ;y{VdT  
    g. 点击OK }_{QsPx9  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 sUP !'Av  
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    脚本代码 S=wJ{?gzAK  
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    '#Language "WWB-COM" AIXvS*Y,  
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    Option Explicit 2%DleR'i  
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    Sub Main 7q] @Jx9  
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        'Cleanup /<s $Am  
        ClearOutputWindow() @}e'(ju%R  
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        Print "Merging RPC Photonics BSDF Data Files" T"GuE[?a  
        SetTextColor(255,0,0) /@.c 59r  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Yv`8{_8L  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." +HK)A%QI  
        SetTextColor(0,0,0) !j3V'XU#Zn  
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        'Current directory of this script (should be the same as the text files being merged) cc%O35o  
        Dim cDir As String Y)@PGxjz  
        cDir = MacroDir$ & "\" .2b) rKo~  
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        'Array which will be populated with the list of files to be merged {xC CUU  
        Dim fList() As String, curFile As String elgCPX&:W  
        GetFileList( cDir, fList ) F)0I7+lP  
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        Print "" 3PonF4  
        Print "Files found for merging:" wnE c   
        For Each curFile In fList P'Fy,fNg  
            Print Chr(9) & curFile e<> Lr  
        Next >t"]gQHtx  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. LaE;{jY  
        Dim nameArray() As String, sampName As String id-VoHd K  
        nameArray = Split(fList(0)," 0-0.txt") / -=(51}E  
        sampName  = nameArray(0) Zw5\{Z0  
        Print "" s'^zudx  
        Print "Sample name: " & Chr(9) & sampName a.5s5g)8  
    ~PNO|]8j  
        'Open an output file and write the FRED header data X*~NE\  
        Dim outFile As String  :*M\z3`k  
        outFile = cDir & sampName & "_FRED.txt" ]kmOX  
        Open outFile For Output As #1 /s%I(iP4  
        Print #1, "type bsdf_data" $p4aNC  
        Print #1, "format angles=deg bsdf=value scale=1" y0qE::/H$  
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        'Loop the file list, skip the two header lines and write the remaining data to file (oxe\Qk  
        Dim lineArray() As String, curLine As Long xQ7n$.?y@  
        For Each curFile In fList s9A'{F  
            Print "Merging data from file " & curFile ISr~JQr  
            ReadFile( cDir & curFile, lineArray ) 13Z6dhZu  
            For curLine = 2 To UBound(lineArray) J1<fE(X  
                Print #1, lineArray(curLine) 4[3T%jA  
            Next oQDOwM,  
        Next 9ok|]d P  
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        'Close the output file *eXO?6f%s^  
        Close #1 7atYWz~yG  
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        Print "Finished merging RPC data for sample " & sampName F!>K8q  
        Print "FRED formatted data file: " & Chr(9) & outFile nRQIrUNq  
    End Sub g]xZ^M+  
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    'Utility function to read the contents of a file into an array of strings. #|XEBOmsQ  
    Function ReadFile(ByVal fileName As String, _ 3i(k6)H$4  
                      ByRef lineArray() As String) As Long ~~1~_0?e  
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        ReadFile = -1 n@L!{zY  
        Dim oFSO As Object A2&&iL=j/  
        Set oFSO = CreateObject("Scripting.FileSystemObject") b=T+#Jb  
        Erase lineArray %FFw!eVi  
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        Dim fid As Long YLd 5  
        If oFSO.fileexists( fileName ) Then o33{tUp'  
            fid = FreeFile() zF i+6I$  
            Open fileName For Input As fid 8VcAtrx_  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) CES FkAj~  
            Close fid <(p1 j0_Q  
        End If G P1>h.J  
        Set oFSO = Nothing N/?Ms rZw  
        Return UBound( lineArray ) _R(5?rG,  
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    End Function $fKwJFr  
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    Sub GetFileList( ByVal in_dir As String, _ 2K*-uT#$~  
                     ByRef in_flist() As String ) uWnS<O  
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        'Redimension the file list array ~POeFZ  
        Erase in_flist oZCi_g 5i  
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        'Tracks how many files are found PYHm6'5BtB  
        Dim fCount As Long Bhq(bV  
        fCount = 0 ` `;$Kr  
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        'Recurse directory and search for text files hTG d Uw]  
        Dim f As String ^Js9E  
        f = Dir$(in_dir & "*.txt") ^LU[{HZV  
        While f <> "" uBE,z>/,;  
            ReDim Preserve in_flist(fCount) H4:TYh  
            in_flist(fCount) = f : m5u=:t  
            fCount += 1 @J<B^_+Se  
            f = Dir$() Na~_=3+a  
        Wend ;5|EpoM  
        ReDim Preserve in_flist(fCount-1) fd,~Yj$R?  
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    End Sub ONGe/CEXT  
     
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