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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 B}8xA}<  
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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 C-lv=FJEk/  
    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。 Ecp]fUQK  
    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。 /"?yB$s  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 hAtf)  
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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。 G vMhgG=D  
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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) 8)HUo?/3  
    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 ste0:.*qb  
    例如下所示: /MYl:>e>  
    Sample name:  EDF-C1-56 [E<NEl *  
    Merging data from file EDF-C1-56 0-0.txt ZN#mu]jC?  
    Finished merging RPC data for sample EDF-C1-56 Wsya:9|  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt VA + ?xk  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 >Lj0B%^EvM  
    a. 创建一个新的散射库 _0dm?=  
    b. 散射模型命名 o0nd]"q?  
    c. 改变散射模型为“Tabulated BSDF”. U Hh  
    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 ) `~0)}K.F  
    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。 ]R[j ]E.  
    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 N\{Xhr7d  
    g. 点击OK 5<ZE.'O  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 lWr=79  
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    脚本代码 mh&wvT<:{  
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    '#Language "WWB-COM" 1) 7n (  
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    Option Explicit &iR3]FNI  
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    Sub Main 1;8=,&  
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        'Cleanup $Y'}wB{pc  
        ClearOutputWindow()  %f3qCN  
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        Print "Merging RPC Photonics BSDF Data Files" }#%3y&7M7  
        SetTextColor(255,0,0) $>^DkrOd  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." q,S[[{("  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." +I~`Ob  
        SetTextColor(0,0,0) LB9D6,*t  
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        'Current directory of this script (should be the same as the text files being merged) *UL++/f  
        Dim cDir As String EHI %QT  
        cDir = MacroDir$ & "\" ,',  S  
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        'Array which will be populated with the list of files to be merged C7PVJnY0  
        Dim fList() As String, curFile As String T($d3Nn1  
        GetFileList( cDir, fList ) 0QJ :  
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        Print "" 0 PdeK'7  
        Print "Files found for merging:" fv@mA--  
        For Each curFile In fList zD}@QoB  
            Print Chr(9) & curFile rgq~lZ.U4K  
        Next \vg(@)$q   
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement.  Y7*8 A,  
        Dim nameArray() As String, sampName As String 4)Jtc2z7Z\  
        nameArray = Split(fList(0)," 0-0.txt") au=A+  
        sampName  = nameArray(0) R:N4_4& C~  
        Print "" <O<Kf:i&c1  
        Print "Sample name: " & Chr(9) & sampName <'T:9  
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        'Open an output file and write the FRED header data @ FNaCmBX  
        Dim outFile As String _\"2Mdk`]  
        outFile = cDir & sampName & "_FRED.txt" ~,Y xUn8@  
        Open outFile For Output As #1 TA4>12C6  
        Print #1, "type bsdf_data" 8-#_xsZ^;  
        Print #1, "format angles=deg bsdf=value scale=1" I1f4u6\*X  
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        'Loop the file list, skip the two header lines and write the remaining data to file "aL.`^.  
        Dim lineArray() As String, curLine As Long L<D<3g|4  
        For Each curFile In fList 1`sLbPW  
            Print "Merging data from file " & curFile `GDWy^-Q+!  
            ReadFile( cDir & curFile, lineArray ) srbES6  
            For curLine = 2 To UBound(lineArray) z:Y Z]   
                Print #1, lineArray(curLine) w]@H]>sHd  
            Next e:9s%|]T  
        Next C4[)yJ  
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        'Close the output file k2 _i;v  
        Close #1 o}4~CN9}  
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        Print "Finished merging RPC data for sample " & sampName !k3 eUBF  
        Print "FRED formatted data file: " & Chr(9) & outFile s7d4)A%  
    End Sub H^3f!\MC;o  
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    'Utility function to read the contents of a file into an array of strings. Q6 oM$qiM  
    Function ReadFile(ByVal fileName As String, _ ohJo1}{  
                      ByRef lineArray() As String) As Long zH5pe  
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        ReadFile = -1 d6+$[4w  
        Dim oFSO As Object +,Ud 3iS  
        Set oFSO = CreateObject("Scripting.FileSystemObject") W(jOD,QMB  
        Erase lineArray WEaG/)y  
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        Dim fid As Long c 80Ffq  
        If oFSO.fileexists( fileName ) Then Qx")D?u  
            fid = FreeFile() \; voBU  
            Open fileName For Input As fid T? g%I  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) { 1eW*9  
            Close fid ;;|o+4Ob;  
        End If ~dBx<  
        Set oFSO = Nothing fsjCu!  
        Return UBound( lineArray ) ZX8 AB  
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    End Function M!wa }  
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    Sub GetFileList( ByVal in_dir As String, _ \1He9~6  
                     ByRef in_flist() As String ) nYnB WDnV  
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        'Redimension the file list array /:;"rnvq  
        Erase in_flist aGAeRF  
    ,<(0T$o E[  
        'Tracks how many files are found @tIY%;Bgk  
        Dim fCount As Long Pi hpo  
        fCount = 0 Fhrj$  
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        'Recurse directory and search for text files #|"M  
        Dim f As String 50CjH"3PZ`  
        f = Dir$(in_dir & "*.txt") qKD Nw8>  
        While f <> "" r i/CLq^D  
            ReDim Preserve in_flist(fCount) ES)@iM?5  
            in_flist(fCount) = f 5{xK&[wR*  
            fCount += 1 5m yQBKE  
            f = Dir$()  y 2C Jk~  
        Wend hLr\;Swyp  
        ReDim Preserve in_flist(fCount-1) udOdXz6K?  
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    End Sub G3o`\4p  
     
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