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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 ~AC P%QM=  
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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 _<%\h?W$  
    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。 WpJD=C%  
    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。 h8#5vO2  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 T@Ss&eGT2  
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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。 B-\,2rCCZ  
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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) K9C@dvFH  
    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 dXhCyr%"6  
    例如下所示: 1#> &p%P!  
    Sample name:  EDF-C1-56 tKG;k"wk  
    Merging data from file EDF-C1-56 0-0.txt Q/QQ:t<XUi  
    Finished merging RPC data for sample EDF-C1-56 waXDGdl0  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q\o$**+{  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 u>,lf\Fgz  
    a. 创建一个新的散射库 2AXF$YjY  
    b. 散射模型命名 BN\fv,  
    c. 改变散射模型为“Tabulated BSDF”. nW $A^  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) &\"Y/b]  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 [}A_uOGEP  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 QmH/yy3.%  
    g. 点击OK w69>tC  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ;OQ'B=uK  
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    脚本代码 y3={NB+  
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    '#Language "WWB-COM" B^i mG  
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    Option Explicit 'GV&]   
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    Sub Main yfSiByU  
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        'Cleanup i(M(OR/4  
        ClearOutputWindow() q3c*<n g#  
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        Print "Merging RPC Photonics BSDF Data Files" ~a'nHy1  
        SetTextColor(255,0,0) K,x$c %  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." &Q'\WA'  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." tSEA999  
        SetTextColor(0,0,0) sTKab :  
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        'Current directory of this script (should be the same as the text files being merged) Y)'!'J  
        Dim cDir As String 5wzQ?07T_  
        cDir = MacroDir$ & "\" P<>[e9|  
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        'Array which will be populated with the list of files to be merged { A:LAAf[6  
        Dim fList() As String, curFile As String "2ZIoa!^  
        GetFileList( cDir, fList ) z6p#fsD  
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        Print "" &q4ox71  
        Print "Files found for merging:" DgDSVFk ~  
        For Each curFile In fList /\TQc-k?2  
            Print Chr(9) & curFile 'is,^q:@  
        Next |f"-|6  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. T1lXYhAWS  
        Dim nameArray() As String, sampName As String o{9?:*?7  
        nameArray = Split(fList(0)," 0-0.txt") e.h~[^zg  
        sampName  = nameArray(0) `[X6#` <  
        Print "" SW3wMPy&s  
        Print "Sample name: " & Chr(9) & sampName &[NVP&9&U  
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        'Open an output file and write the FRED header data P-[fHCg~  
        Dim outFile As String a;56k  
        outFile = cDir & sampName & "_FRED.txt" MP jr_yc]  
        Open outFile For Output As #1 ~@%(RMJm&  
        Print #1, "type bsdf_data" !IO&&\5  
        Print #1, "format angles=deg bsdf=value scale=1" .KFA218h*x  
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        'Loop the file list, skip the two header lines and write the remaining data to file p:Iw%eZ:  
        Dim lineArray() As String, curLine As Long NU|qX {-  
        For Each curFile In fList zXQVUhL6  
            Print "Merging data from file " & curFile dj3|f{kg{  
            ReadFile( cDir & curFile, lineArray ) '!pAnsXfO  
            For curLine = 2 To UBound(lineArray) =ZG<BG_  
                Print #1, lineArray(curLine) ah 4kA LO  
            Next buRhQ"  
        Next A)OdQFet(  
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        'Close the output file U%Dit  
        Close #1 l<$rqz3D  
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        Print "Finished merging RPC data for sample " & sampName lrCm9Oy  
        Print "FRED formatted data file: " & Chr(9) & outFile \.5F](:  
    End Sub sjSi;S4  
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    'Utility function to read the contents of a file into an array of strings. T0g0jr{  
    Function ReadFile(ByVal fileName As String, _ :eSc;  
                      ByRef lineArray() As String) As Long <BZ_ (H  
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        ReadFile = -1 37#cx)p^f  
        Dim oFSO As Object T]^?l  
        Set oFSO = CreateObject("Scripting.FileSystemObject") j(&GVy^;?  
        Erase lineArray P2O\!'aEh  
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        Dim fid As Long _jW>dU^B  
        If oFSO.fileexists( fileName ) Then {&E?<D2_&  
            fid = FreeFile() _0w1 kqW  
            Open fileName For Input As fid z3clUtC+  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) WmNA5;<Q  
            Close fid 8IeI0f"l)  
        End If S[Vtq^lU  
        Set oFSO = Nothing </,.K`''W  
        Return UBound( lineArray ) ebzzzmwo  
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    End Function 18jJzYawh  
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    Sub GetFileList( ByVal in_dir As String, _ XWJ SLN(O  
                     ByRef in_flist() As String ) s} s|~  
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        'Redimension the file list array TM)u?t+[  
        Erase in_flist ]}.0el{  
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        'Tracks how many files are found HV8I nodi  
        Dim fCount As Long ti}f&w ICJ  
        fCount = 0 Vu=] O/ =P  
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        'Recurse directory and search for text files h 5Hr[E1  
        Dim f As String |4 Qx=x>  
        f = Dir$(in_dir & "*.txt") 04~}IbeJ  
        While f <> "" |88CBiu}  
            ReDim Preserve in_flist(fCount) N0nj`  
            in_flist(fCount) = f  e#1.T  
            fCount += 1 W8y$ Ve8m  
            f = Dir$() @' d6iYk_  
        Wend \Yd4gaY\o  
        ReDim Preserve in_flist(fCount-1) Nfg{,/ O  
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    End Sub d @m\f  
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