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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 +DMD g.  
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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 v0EF?$Wo  
    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。 KLqn`m`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。 ATq)8Rm\  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 x2gnB@t  
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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。 cR.[4rG'  
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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) {=]1]IWt  
    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 8SmtEV[b3  
    例如下所示: fNz*E|]8&  
    Sample name:  EDF-C1-56 P} =eR  
    Merging data from file EDF-C1-56 0-0.txt 0@;kD]Z  
    Finished merging RPC data for sample EDF-C1-56 -oGJPl{r  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 2p3ep,  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Gt{'` P,&9  
    a. 创建一个新的散射库 dxm_AUM  
    b. 散射模型命名 .O9 A[s<  
    c. 改变散射模型为“Tabulated BSDF”. ;DWtCtD  
    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 ) B/#tR^R  
    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。 5X^bvW26  
    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 H` !%"  
    g. 点击OK sDV*k4  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 B-63IN  
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    脚本代码 Q8:`;W  
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    '#Language "WWB-COM" U'IJwGRP  
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    Option Explicit "]BefvE  
    ).+!/x  
    Sub Main -OLXRc=  
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        'Cleanup n ,<`.^  
        ClearOutputWindow() Mp;yvatO  
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        Print "Merging RPC Photonics BSDF Data Files" H]:z:AAvX  
        SetTextColor(255,0,0) '8g/^Y@  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ;1Kxqp z_i  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." G$\2@RT9[  
        SetTextColor(0,0,0) S30@|@fTz  
    :sT\-MpQvn  
        'Current directory of this script (should be the same as the text files being merged) %,9iY&;U"  
        Dim cDir As String bI^zwK,@4  
        cDir = MacroDir$ & "\" g=?KpI-pn0  
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        'Array which will be populated with the list of files to be merged >-0b@ +j  
        Dim fList() As String, curFile As String 3HsjF5?W  
        GetFileList( cDir, fList ) phIEz3Fu/  
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        Print "" {Kp<T  
        Print "Files found for merging:" h-VpX6  
        For Each curFile In fList !x9j~D'C`  
            Print Chr(9) & curFile %]9 <a  
        Next Ed/@&52z0  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. J90q\_dY.  
        Dim nameArray() As String, sampName As String ],r?]>  
        nameArray = Split(fList(0)," 0-0.txt") b@ J&jE~d  
        sampName  = nameArray(0) *b" (r|Ko  
        Print "" cK.T=7T  
        Print "Sample name: " & Chr(9) & sampName Ty]/F+{  
    SU, t,i  
        'Open an output file and write the FRED header data I>b-w;cC  
        Dim outFile As String )2X ng_,  
        outFile = cDir & sampName & "_FRED.txt" g{8 R+  
        Open outFile For Output As #1 7lpd$Y  
        Print #1, "type bsdf_data" }z&P^p)R  
        Print #1, "format angles=deg bsdf=value scale=1" s(7'*`G"h  
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        'Loop the file list, skip the two header lines and write the remaining data to file P=& Je?  
        Dim lineArray() As String, curLine As Long 0|X!Uw-Q%_  
        For Each curFile In fList H[%F o  
            Print "Merging data from file " & curFile 6l#1E#]|  
            ReadFile( cDir & curFile, lineArray ) ;_0)f  
            For curLine = 2 To UBound(lineArray) !x.^ya  
                Print #1, lineArray(curLine) &?3?8Q\  
            Next zOq~?>Ms6  
        Next tkdhT8_  
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        'Close the output file `$`:PT\Zv4  
        Close #1 [~)i<V|qJ  
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        Print "Finished merging RPC data for sample " & sampName xJ9_#$ngeM  
        Print "FRED formatted data file: " & Chr(9) & outFile aDa}@-F&a  
    End Sub \S;% "0!  
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    'Utility function to read the contents of a file into an array of strings. XKp%7;  
    Function ReadFile(ByVal fileName As String, _ A"Rzn1/  
                      ByRef lineArray() As String) As Long I=hgfo  
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        ReadFile = -1 Kq`Luf  
        Dim oFSO As Object 7|6tH@4Ub  
        Set oFSO = CreateObject("Scripting.FileSystemObject") uqZLlP#&#  
        Erase lineArray *MkhRLw\,  
    !?tWWU%P)  
        Dim fid As Long MAR kTxzi  
        If oFSO.fileexists( fileName ) Then <C6/R]x#  
            fid = FreeFile() xy$FS0u  
            Open fileName For Input As fid tZ[BfO  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ~0?p @8  
            Close fid &RXd1>|c2  
        End If QN-n9f8  
        Set oFSO = Nothing 9G_=)8sOV  
        Return UBound( lineArray ) 1L'[DKb'  
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    End Function S^)r,cC  
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    Sub GetFileList( ByVal in_dir As String, _ aEdF Z  
                     ByRef in_flist() As String ) #2DH_P  
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        'Redimension the file list array 5HG 7M&_  
        Erase in_flist qx{.`AaZW  
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        'Tracks how many files are found r_xo>y~S  
        Dim fCount As Long kVU|k-?2  
        fCount = 0 /_,~dt  
    Z;S*fS-_  
        'Recurse directory and search for text files bS/`G0!  
        Dim f As String 5?;'26iC  
        f = Dir$(in_dir & "*.txt") QVn0!R{  
        While f <> "" 94APjqV6'  
            ReDim Preserve in_flist(fCount) vkq?z~GA  
            in_flist(fCount) = f 'n:Ft  
            fCount += 1 j)-D.bY0  
            f = Dir$() =AL95"cH~  
        Wend Q77qrx3  
        ReDim Preserve in_flist(fCount-1) kTi QO2H  
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    End Sub *, *"G?  
     
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