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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 st wxF?\NS  
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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 i2 G.<(3O  
    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。 `R,g_{M j  
    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。 evGUl~</~  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 "RLv{D<)J,  
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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。 rLp (}^  
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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) =p>IP"HJ  
    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 G1G*TSf  
    例如下所示: FS7@6I2Ts  
    Sample name:  EDF-C1-56 u:M)JG  
    Merging data from file EDF-C1-56 0-0.txt /<Yz;\:Jy  
    Finished merging RPC data for sample EDF-C1-56 Zk> #T:{h  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt CZw]@2/JuQ  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 aM|;3j1p  
    a. 创建一个新的散射库 .dKFQH iYJ  
    b. 散射模型命名 4x"9Wr=}  
    c. 改变散射模型为“Tabulated BSDF”. ZiaHLpk  
    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 ) 9qI#vHA  
    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。 PdSYFJM  
    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 '?uwUBi  
    g. 点击OK ^!rAT1(/_  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 3NSX(gC%  
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    脚本代码 PgdHH:v)  
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    '#Language "WWB-COM" N;R I A  
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    Option Explicit l$ufW|  
     ,$(a,`s)  
    Sub Main ?g9oiOhnG  
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        'Cleanup 'nN'bVl/  
        ClearOutputWindow() nR8r$2B+t  
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        Print "Merging RPC Photonics BSDF Data Files" xl ,(=L]  
        SetTextColor(255,0,0) SGP)A(,k9  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." GUC.t7!  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." I6Ga'5bV  
        SetTextColor(0,0,0) U?=-V8#M|  
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        'Current directory of this script (should be the same as the text files being merged) vbEO pYCS  
        Dim cDir As String =XFyEt  
        cDir = MacroDir$ & "\" _&e$?hY  
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        'Array which will be populated with the list of files to be merged A5go)~x\  
        Dim fList() As String, curFile As String *AJYSa,z  
        GetFileList( cDir, fList ) "Pa  y2  
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        Print "" S`pBEM  
        Print "Files found for merging:" Mb=j'H<N@  
        For Each curFile In fList 65U&P5W  
            Print Chr(9) & curFile eS/Au[wS  
        Next %r]V:d+  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. R\-]t{t`  
        Dim nameArray() As String, sampName As String `J %35  
        nameArray = Split(fList(0)," 0-0.txt") zKfY0A R  
        sampName  = nameArray(0) LC})aV|  
        Print "" 9QHV%%  
        Print "Sample name: " & Chr(9) & sampName s9,Z}]Th  
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        'Open an output file and write the FRED header data ]JH Int  
        Dim outFile As String @  \*Zq  
        outFile = cDir & sampName & "_FRED.txt" eFC~&L;  
        Open outFile For Output As #1 f&!{o=  
        Print #1, "type bsdf_data" oAgU rl;R  
        Print #1, "format angles=deg bsdf=value scale=1" 1F R  
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        'Loop the file list, skip the two header lines and write the remaining data to file v)JS4KS  
        Dim lineArray() As String, curLine As Long '?1g_C QsS  
        For Each curFile In fList M8${&&[;  
            Print "Merging data from file " & curFile UB w*}p  
            ReadFile( cDir & curFile, lineArray ) r*UE>_3J  
            For curLine = 2 To UBound(lineArray) ^ /)%s3  
                Print #1, lineArray(curLine) gWfMUl  
            Next u1`JvfLrL  
        Next ^00C"58A  
    `#?]g!  
        'Close the output file O? 0`QMY  
        Close #1 aSIoq}c(  
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        Print "Finished merging RPC data for sample " & sampName Hb\['VhzM  
        Print "FRED formatted data file: " & Chr(9) & outFile 7A^L$TY  
    End Sub A8 !&Y;d  
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    'Utility function to read the contents of a file into an array of strings. K{0 gkORF  
    Function ReadFile(ByVal fileName As String, _ |#zj~>7?  
                      ByRef lineArray() As String) As Long ^1bM=9]F0  
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        ReadFile = -1 [JKLlR  
        Dim oFSO As Object Q-KBQc  
        Set oFSO = CreateObject("Scripting.FileSystemObject") G%>M@nYUE  
        Erase lineArray D~)bAPAD  
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        Dim fid As Long A'n{K#  
        If oFSO.fileexists( fileName ) Then \7G.anY  
            fid = FreeFile() ~0rvrDDg  
            Open fileName For Input As fid  CP Ju=  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf)  {?Cm  
            Close fid *2 ~"%"C  
        End If .9q`Tf  
        Set oFSO = Nothing B?9"Ztb  
        Return UBound( lineArray ) )H+p6<  
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    End Function =m 6<H  
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    Sub GetFileList( ByVal in_dir As String, _ i4m P*RwC  
                     ByRef in_flist() As String ) /|@~:5R5H  
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        'Redimension the file list array DJ`xCs!R  
        Erase in_flist d?aZk-|c  
    ,,;vG6^a  
        'Tracks how many files are found 2:&L|;  
        Dim fCount As Long :A5h<=[  
        fCount = 0 uG(XbDZZ1W  
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        'Recurse directory and search for text files 8Fv4\dr  
        Dim f As String !UHX? <3r  
        f = Dir$(in_dir & "*.txt") t c{Qd&"(  
        While f <> "" ) .W0}  
            ReDim Preserve in_flist(fCount) FY pspv?4  
            in_flist(fCount) = f ]3uj~la  
            fCount += 1 g#o9[su  
            f = Dir$() ,; n[_f  
        Wend w`[`:H_z  
        ReDim Preserve in_flist(fCount-1) e8{!Kjiz  
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    End Sub szp.\CMz  
     
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