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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 o{wXq)b  
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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 [h^bBq  
    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。 SH${\BKup  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 V[N4 {c  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 z4 yV1  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 17{$D ,P  
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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) #+,O  
    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 zgh~P^Z  
    例如下所示: ;_vo2zl1  
    Sample name:  EDF-C1-56 *(sUz?t  
    Merging data from file EDF-C1-56 0-0.txt f~NGIlgR  
    Finished merging RPC data for sample EDF-C1-56 4]$$ar)  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 6$|!_94>*)  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 X}s}E ;v9  
    a. 创建一个新的散射库 pZv>{=2hOS  
    b. 散射模型命名  + Y  
    c. 改变散射模型为“Tabulated BSDF”. n!K<g.tjW  
    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 ) S=bdue  
    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。 $rG~0  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 {KO +t7'Q  
    g. 点击OK ') -Rv]xe  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ~Uz1()ftz  
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    脚本代码 w0FkKJV  
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    '#Language "WWB-COM" dUg| {l  
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    Option Explicit 6 -\ghPo  
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    Sub Main |tkhsQ-;  
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        'Cleanup 17nONhh  
        ClearOutputWindow() mSu1/?PS  
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        Print "Merging RPC Photonics BSDF Data Files" &>. w*  
        SetTextColor(255,0,0) k5%:L2FO  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ZV; lr Vv  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." c5t],P  
        SetTextColor(0,0,0) C=z7Gk=  
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        'Current directory of this script (should be the same as the text files being merged) '&.QW$B\B_  
        Dim cDir As String U[Pll~m2b  
        cDir = MacroDir$ & "\" LmKG6>Q1#1  
    8"\g?/  
        'Array which will be populated with the list of files to be merged ZKv^q%92  
        Dim fList() As String, curFile As String LS=HX~5C  
        GetFileList( cDir, fList ) smM*HDK  
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        Print "" D6KYkN(,v  
        Print "Files found for merging:" SbLx`]rI  
        For Each curFile In fList -R[ *S "  
            Print Chr(9) & curFile !\0UEC  
        Next _p~lL<q-K[  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Q599@5aS  
        Dim nameArray() As String, sampName As String )K4A-9pC  
        nameArray = Split(fList(0)," 0-0.txt") @} 61D  
        sampName  = nameArray(0) XkWO-L  
        Print "" .5',w"R  
        Print "Sample name: " & Chr(9) & sampName ib4shaN`  
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        'Open an output file and write the FRED header data <3wfY #;><  
        Dim outFile As String 26c,hPIeXY  
        outFile = cDir & sampName & "_FRED.txt" wX_s./#JJ  
        Open outFile For Output As #1 ccUq!1  
        Print #1, "type bsdf_data" w!0`JPu  
        Print #1, "format angles=deg bsdf=value scale=1" Wgt[ACioN  
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        'Loop the file list, skip the two header lines and write the remaining data to file !z !R)6  
        Dim lineArray() As String, curLine As Long +w ;2kw  
        For Each curFile In fList cMCGaaLU  
            Print "Merging data from file " & curFile &ggS!y'n  
            ReadFile( cDir & curFile, lineArray ) J!$q"0G'WT  
            For curLine = 2 To UBound(lineArray) XNwZSW  
                Print #1, lineArray(curLine) gg>O:np8  
            Next t,*hxzD"  
        Next f_*Bd.@  
    ~Bll\3-=  
        'Close the output file ohFUy}y  
        Close #1 ~bp^Q| wM  
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        Print "Finished merging RPC data for sample " & sampName $"d< F3k  
        Print "FRED formatted data file: " & Chr(9) & outFile l .8@F  
    End Sub RJ ,a}w[9  
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    'Utility function to read the contents of a file into an array of strings. zj ;'0Zu  
    Function ReadFile(ByVal fileName As String, _ ]ov>VF,<  
                      ByRef lineArray() As String) As Long Le&SN7I  
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        ReadFile = -1 j4v.8;  
        Dim oFSO As Object ,)u\G(N  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 1 m)WM,L  
        Erase lineArray lKo07s6u  
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        Dim fid As Long ;(cq aB  
        If oFSO.fileexists( fileName ) Then eIEr\X4\~~  
            fid = FreeFile() xn49[T  
            Open fileName For Input As fid yF &"'L  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1(z&0Y;  
            Close fid i%m]<yElm  
        End If }<y-`WB  
        Set oFSO = Nothing N? r{Y$x  
        Return UBound( lineArray ) Mqu>#lL  
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    End Function 6I0G.N  
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    Sub GetFileList( ByVal in_dir As String, _  `Pa)H  
                     ByRef in_flist() As String ) N=e-"8  
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        'Redimension the file list array =Ri'Pr x&  
        Erase in_flist p<5ED\;N;  
    ][b_l(r$?  
        'Tracks how many files are found B3Id}[V  
        Dim fCount As Long V=)0{7-9  
        fCount = 0 %d<uOCf\Q  
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        'Recurse directory and search for text files %E\&9,  
        Dim f As String N# o" W  
        f = Dir$(in_dir & "*.txt") 1Ner1EKGp  
        While f <> "" `Zn2Vx  
            ReDim Preserve in_flist(fCount) {ZiZ$itf  
            in_flist(fCount) = f )<w`E{q  
            fCount += 1  3z^l  
            f = Dir$() ?]i.Zi\[f  
        Wend ~&>|u5C*@  
        ReDim Preserve in_flist(fCount-1) f9A^0A?c  
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    End Sub yH\z+A|  
     
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