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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 正序阅读 楼主  发表于: 2023-05-11
    摘要 Fb^:V4<T  
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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 +w.JpbQ&  
    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。 Rniq(FA x  
    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"K=zt"  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 mMb'@  
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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。 3H|_mX  
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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) `0P$#5?  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ?RK]FP"A  
    例如下所示: o3I Tr';  
    Sample name:  EDF-C1-56 2_zp:v  
    Merging data from file EDF-C1-56 0-0.txt BO~PT,QrF  
    Finished merging RPC data for sample EDF-C1-56 `FYv3w2  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt |P -8HlOr  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 J(c{y]`J  
    a. 创建一个新的散射库 |g #K]v  
    b. 散射模型命名 jFA{+Yr1  
    c. 改变散射模型为“Tabulated BSDF”. t%'Z<DmG+  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) wvbPnf^y  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 *d"DA[(  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 =|I>G?g-  
    g. 点击OK A j2OkD  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 d/ bEt&  
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    脚本代码 w9, iq@  
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    '#Language "WWB-COM" >y[oP!-|P  
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    Option Explicit mml<9fbH  
    #|*F1K  
    Sub Main iVd.f A  
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        'Cleanup 'UMXq~RMe  
        ClearOutputWindow() m < 3Ao^I+  
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        Print "Merging RPC Photonics BSDF Data Files" G.( mp<-  
        SetTextColor(255,0,0) k'#(1(xj  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." QF&W`c  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ^NX"sM0g  
        SetTextColor(0,0,0) {W]=~*w  
    'A:x/iv}^  
        'Current directory of this script (should be the same as the text files being merged) (HSgEs1d  
        Dim cDir As String 1qf!DMcdZ  
        cDir = MacroDir$ & "\" RLSc+kDH_  
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        'Array which will be populated with the list of files to be merged xia|+  
        Dim fList() As String, curFile As String ds&e|VSH;  
        GetFileList( cDir, fList ) 7c~u=U"  
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        Print "" Q",0F{'  
        Print "Files found for merging:" Rr!Y3)f;  
        For Each curFile In fList 2AtLyN'.  
            Print Chr(9) & curFile 2D:fJ~|-[  
        Next L~I hsiB  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 1P(|[W1  
        Dim nameArray() As String, sampName As String jq+A-T}@  
        nameArray = Split(fList(0)," 0-0.txt") k%E2n:|*  
        sampName  = nameArray(0) Fr%d}g  
        Print "" jiYmb8Q4D  
        Print "Sample name: " & Chr(9) & sampName ak:ibV  
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        'Open an output file and write the FRED header data ;\[(- )f!=  
        Dim outFile As String 5ux`U{`m  
        outFile = cDir & sampName & "_FRED.txt" Bf$_XG3  
        Open outFile For Output As #1 &[At`Nw71  
        Print #1, "type bsdf_data" H_0/f8GwnG  
        Print #1, "format angles=deg bsdf=value scale=1" ;s~X  
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        'Loop the file list, skip the two header lines and write the remaining data to file *b xzCI7b  
        Dim lineArray() As String, curLine As Long ZvUC I8  
        For Each curFile In fList ixV0|P8,c  
            Print "Merging data from file " & curFile @fa@s-wb  
            ReadFile( cDir & curFile, lineArray ) 8Th` ]tI  
            For curLine = 2 To UBound(lineArray) !H2QjW  
                Print #1, lineArray(curLine) [xT:]Pw}  
            Next BbRBT@  
        Next 8@PX7!9  
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        'Close the output file ]r-C1bKD`  
        Close #1 TO-nD>  
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        Print "Finished merging RPC data for sample " & sampName 9{$'S 4  
        Print "FRED formatted data file: " & Chr(9) & outFile oX4q`rt  
    End Sub +z9gbcx  
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    'Utility function to read the contents of a file into an array of strings. 1-Po Z[p-R  
    Function ReadFile(ByVal fileName As String, _ g/&T[FOr  
                      ByRef lineArray() As String) As Long [y0O{,lI  
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        ReadFile = -1 wP57Pf0  
        Dim oFSO As Object -kS~xVS|  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ^{\<N()R  
        Erase lineArray TI !a)X  
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        Dim fid As Long 5"/J^"!h  
        If oFSO.fileexists( fileName ) Then (o J9k[(  
            fid = FreeFile() :=9] c17=  
            Open fileName For Input As fid ex<O]kPFE  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ~Aq5X I%i  
            Close fid 4HAp{a1  
        End If vm'5s]kdh  
        Set oFSO = Nothing ;r /;m\V  
        Return UBound( lineArray ) jt@SZI`  
    ](B@5-^  
    End Function #UtFD^h  
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    Sub GetFileList( ByVal in_dir As String, _ CdUAy|!`R  
                     ByRef in_flist() As String ) ?go:e#  
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        'Redimension the file list array huudBc A[  
        Erase in_flist {}o>{&X  
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        'Tracks how many files are found UA~RK2k?  
        Dim fCount As Long -AYA~O(&  
        fCount = 0 9]'($:LF08  
    "C?5f]T  
        'Recurse directory and search for text files ez3Z3t`  
        Dim f As String hCYQGx0  
        f = Dir$(in_dir & "*.txt") E1&b#TE 6O  
        While f <> "" l/y]nw  
            ReDim Preserve in_flist(fCount) $^ 'aCU0C  
            in_flist(fCount) = f I5AO?BzJ  
            fCount += 1 ~dHM4lGY  
            f = Dir$() 8SmnMt  
        Wend IkzTJ%>  
        ReDim Preserve in_flist(fCount-1) q@hp.(V  
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    End Sub B$?qQ|0:=  
     
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