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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 ?SQE5Z  
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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 \]Kh[z0"  
    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。 3P~o"a>  
    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。 uJx"W  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 0tIS Xu-  
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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。 iUMY!eqp  
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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) hc (e$##  
    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  $p!yhn7  
    例如下所示: gK#mPcn^  
    Sample name:  EDF-C1-56 o)6pA^+  
    Merging data from file EDF-C1-56 0-0.txt dpQG[vXe  
    Finished merging RPC data for sample EDF-C1-56 Gir#"5F  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt NW~z&8L  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 DU%w1+u  
    a. 创建一个新的散射库 Ze< K=Q%(i  
    b. 散射模型命名 *vgl*k?)  
    c. 改变散射模型为“Tabulated BSDF”. g&dPd7  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) W{z.?$ SH  
    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。 $,I q;*7N  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 {NpM.;  
    g. 点击OK [' z[  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 3X9b2RY*L/  
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    脚本代码 l1ZY1#%j  
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    '#Language "WWB-COM" A5,t+8`aci  
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    Option Explicit Iff9'TE  
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    Sub Main Va Z!.#(P  
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        'Cleanup N@B9 @8h  
        ClearOutputWindow() imQUR C  
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        Print "Merging RPC Photonics BSDF Data Files" E{6~oZ#L  
        SetTextColor(255,0,0) Q1V9PRZX  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." sNun+xsf^  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." XdH\OJ  
        SetTextColor(0,0,0) rt JtK6t  
    ]weoTn:  
        'Current directory of this script (should be the same as the text files being merged) zy*/T>{#  
        Dim cDir As String hdTzCfeZ5@  
        cDir = MacroDir$ & "\" t|t#vcB  
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        'Array which will be populated with the list of files to be merged !w BJ,&E  
        Dim fList() As String, curFile As String #plY\0E@  
        GetFileList( cDir, fList ) $mF_,|  
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        Print "" &.TTJsKG h  
        Print "Files found for merging:" \uss Uv  
        For Each curFile In fList %s19KGpA  
            Print Chr(9) & curFile 8[6o (  
        Next @p\}pY$T  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. \EseGgd21  
        Dim nameArray() As String, sampName As String Vh>Z,()>>@  
        nameArray = Split(fList(0)," 0-0.txt") bLt.O(T}  
        sampName  = nameArray(0) mN8pg4  
        Print "" 26CS6(sn  
        Print "Sample name: " & Chr(9) & sampName 6q 2_WX  
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        'Open an output file and write the FRED header data Ov<NsNX]  
        Dim outFile As String D7_*k%;@  
        outFile = cDir & sampName & "_FRED.txt" 0p89: I*0  
        Open outFile For Output As #1 w3jO6*_ M  
        Print #1, "type bsdf_data" ^*fQX1h<  
        Print #1, "format angles=deg bsdf=value scale=1" 'vNG(h#%d  
    }@.|?2b +  
        'Loop the file list, skip the two header lines and write the remaining data to file 8QMPY[{   
        Dim lineArray() As String, curLine As Long :1Sl"?xU  
        For Each curFile In fList }1IpON  
            Print "Merging data from file " & curFile [9:9Ql_h  
            ReadFile( cDir & curFile, lineArray ) +}jJ&Z9 )  
            For curLine = 2 To UBound(lineArray) },|M9 I0  
                Print #1, lineArray(curLine) V59(Z  
            Next hlt[\LP=$  
        Next s(W|f|R  
    =-p$jXVW%  
        'Close the output file m.,U:>  
        Close #1 ID/ F  
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        Print "Finished merging RPC data for sample " & sampName 6Aocm R0D'  
        Print "FRED formatted data file: " & Chr(9) & outFile aMTu-hA  
    End Sub ^j7azn  
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    'Utility function to read the contents of a file into an array of strings. B7imV@<  
    Function ReadFile(ByVal fileName As String, _ bJs9X/E  
                      ByRef lineArray() As String) As Long &r:7g%{n  
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        ReadFile = -1 $ MC)}l  
        Dim oFSO As Object .`&F>o(A  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ~K@'+5Pc  
        Erase lineArray F:aILx  
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        Dim fid As Long z?35=%~w   
        If oFSO.fileexists( fileName ) Then 6uR^%W8]  
            fid = FreeFile() +@r*}  
            Open fileName For Input As fid -lv)tHs<  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 5 (A5Y-B  
            Close fid JfPD}w  
        End If 'F3)9&M  
        Set oFSO = Nothing {5  sO  
        Return UBound( lineArray ) iQ"XLrpl  
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    End Function A`R{m0A  
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    Sub GetFileList( ByVal in_dir As String, _ |ZQ@fmvL/p  
                     ByRef in_flist() As String ) h yv2SxP*  
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        'Redimension the file list array 7 x<i :x3  
        Erase in_flist 71l%MH  
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        'Tracks how many files are found ~zw]5|  
        Dim fCount As Long A%^ILyU6c  
        fCount = 0 {^N[("`  
    )RcL/n  
        'Recurse directory and search for text files &ot/nQQ  
        Dim f As String LCQE_}Mh  
        f = Dir$(in_dir & "*.txt") 3'X.}>o   
        While f <> "" W | o'&  
            ReDim Preserve in_flist(fCount) \J6j38D5  
            in_flist(fCount) = f )(@Hd  
            fCount += 1 9HX =T%  
            f = Dir$() (IPY^>h  
        Wend 1m.W<  
        ReDim Preserve in_flist(fCount-1) .rf" (lM  
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    End Sub > %KuNy{  
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