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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 Wh5O{G@Ut  
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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 Z;D3lbqE  
    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。 A#&qoZ(C  
    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。 C&kl*nO  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 tL{~O=  
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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。 3ohcHQ/a  
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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)  twmJ  
    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 / LM  
    例如下所示: I?Fa  
    Sample name:  EDF-C1-56 IQe[ CcM  
    Merging data from file EDF-C1-56 0-0.txt 3z92Gy5cr  
    Finished merging RPC data for sample EDF-C1-56 5KE%@,k k  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt O7'3}P;  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 q- (N Zno  
    a. 创建一个新的散射库 B@inH]wq  
    b. 散射模型命名 NP'Ke:  
    c. 改变散射模型为“Tabulated BSDF”. e-3pg?M  
    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 ) Ks2%F&\cE  
    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。 oh0|2IrM  
    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 a9zph2o-  
    g. 点击OK E(kpK5h{  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 GY]6#>D#7  
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    脚本代码 8:?Q(M7  
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    '#Language "WWB-COM" #r)1<}_e#  
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    Option Explicit $1zeY6O  
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    Sub Main }"B? 8T@_~  
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        'Cleanup }9udo,RWu  
        ClearOutputWindow() kJi&9  
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        Print "Merging RPC Photonics BSDF Data Files" J&ECm+2  
        SetTextColor(255,0,0) Po11EZa$a  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." |4> r"  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 3J~kiy.nfW  
        SetTextColor(0,0,0) m2q;^o:J  
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        'Current directory of this script (should be the same as the text files being merged) U"y'Kd  
        Dim cDir As String J*~2 :{=%  
        cDir = MacroDir$ & "\" ,x"yZ  
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        'Array which will be populated with the list of files to be merged PT@e),{~o9  
        Dim fList() As String, curFile As String uj9tr`Zh  
        GetFileList( cDir, fList ) FWpN:|X BS  
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        Print "" 9#T%bB "J  
        Print "Files found for merging:" ?~JxO/K  
        For Each curFile In fList g;#KBxE  
            Print Chr(9) & curFile gLSG:7m@  
        Next v7<S F  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Q@W|GOH3  
        Dim nameArray() As String, sampName As String i=X*  
        nameArray = Split(fList(0)," 0-0.txt") #"p1Qea$  
        sampName  = nameArray(0) )Z8"uRTb0  
        Print "" k CW!m  
        Print "Sample name: " & Chr(9) & sampName ^o6)[_L  
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        'Open an output file and write the FRED header data SeNF!k% Y  
        Dim outFile As String }y-;>i#m=g  
        outFile = cDir & sampName & "_FRED.txt" e8ULf~I  
        Open outFile For Output As #1 F;Q_*0mIQ  
        Print #1, "type bsdf_data" 2Z;`#{  
        Print #1, "format angles=deg bsdf=value scale=1" *0&4mi8  
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        'Loop the file list, skip the two header lines and write the remaining data to file ;Up'~BP(  
        Dim lineArray() As String, curLine As Long eC^0I78x  
        For Each curFile In fList -_EY$ ?4  
            Print "Merging data from file " & curFile juYA`:qE&  
            ReadFile( cDir & curFile, lineArray )  [ }p  
            For curLine = 2 To UBound(lineArray) Ck3QrfM  
                Print #1, lineArray(curLine) N(_ .N6  
            Next 0/SC  
        Next cbh#E)[ '  
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        'Close the output file }c35FM,  
        Close #1 a81!~1A  
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        Print "Finished merging RPC data for sample " & sampName e+F}9HR7  
        Print "FRED formatted data file: " & Chr(9) & outFile >w2Q 1!  
    End Sub q?;*g@t  
    Y/^[qD  
    'Utility function to read the contents of a file into an array of strings. H]tSb//qc  
    Function ReadFile(ByVal fileName As String, _ - - i&"  
                      ByRef lineArray() As String) As Long 5?3Isw`v2  
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        ReadFile = -1 Mt[Bq6}ZD  
        Dim oFSO As Object y$j1?7  
        Set oFSO = CreateObject("Scripting.FileSystemObject") W$JY M3!  
        Erase lineArray S_T{L  
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        Dim fid As Long MtZt8s  
        If oFSO.fileexists( fileName ) Then 9feD!0A  
            fid = FreeFile() zdLVxL>87  
            Open fileName For Input As fid 8^<c,!DM  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) B@cJ\  
            Close fid IwTr'}XIw  
        End If m\*&2Na  
        Set oFSO = Nothing ^i{,z*vi  
        Return UBound( lineArray ) '?{0z!!  
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    End Function < 72s7*Rv  
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    Sub GetFileList( ByVal in_dir As String, _ B#HnPUUK  
                     ByRef in_flist() As String ) A+0T"2  
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        'Redimension the file list array ",~ b2]ym  
        Erase in_flist j}|N^A_ S  
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        'Tracks how many files are found K[Y c<Q  
        Dim fCount As Long =w',-+@  
        fCount = 0 "C:rTIH  
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        'Recurse directory and search for text files /Y;+PAy  
        Dim f As String C+/Eqq^(  
        f = Dir$(in_dir & "*.txt") U/.w;DI   
        While f <> "" *oEv,I_  
            ReDim Preserve in_flist(fCount) Q?* nuE  
            in_flist(fCount) = f u{g]gA8s  
            fCount += 1 (y=dR1p  
            f = Dir$() 6PiEa(  
        Wend 'fS?xDs-v  
        ReDim Preserve in_flist(fCount-1) dzgs%qtK  
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    End Sub kk 8R  
     
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