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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 Ersr\ZB  
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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  r21?c|IP  
    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。 rnMG0  
    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。 P EX26==  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 .*RB~c t  
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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。 G_2gKkIK-  
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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) -A~;MGY  
    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 SQdz EF  
    例如下所示: 5(iSOsb  
    Sample name:  EDF-C1-56 7~!I2DV_  
    Merging data from file EDF-C1-56 0-0.txt xVsa,EX b  
    Finished merging RPC data for sample EDF-C1-56 dT0^-XSY  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt eHVdZ'%x  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ;1{iF2jZ:  
    a. 创建一个新的散射库 1V*8,YiC<  
    b. 散射模型命名 ++Rdv0~  
    c. 改变散射模型为“Tabulated BSDF”. vpeq:h  
    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 ) 'WKu0Yi^'  
    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。 2|0Je^$|  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 g^s+C Z  
    g. 点击OK di]$dl|Wi  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 8~&F/C*  
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    脚本代码 W;3 R;  
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    '#Language "WWB-COM" `!UaScM  
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    Option Explicit ".~Mm F  
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    Sub Main !XgQJ7y_Z  
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        'Cleanup [5]R?bQ0q{  
        ClearOutputWindow() ?dp -}3/G  
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        Print "Merging RPC Photonics BSDF Data Files" Qv&T E3  
        SetTextColor(255,0,0) c^ixdk  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." hr J$%U  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 96.IuwL*.s  
        SetTextColor(0,0,0) _N>wzkJ  
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        'Current directory of this script (should be the same as the text files being merged) #t"9TP  
        Dim cDir As String /`7 IK  
        cDir = MacroDir$ & "\" T5 K-gz7A  
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        'Array which will be populated with the list of files to be merged L/qZ ;{  
        Dim fList() As String, curFile As String RtW4 n:c  
        GetFileList( cDir, fList ) r:fwrC  
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        Print "" EsT0"{  
        Print "Files found for merging:" keT?,YI  
        For Each curFile In fList 7ZF}0K$^B  
            Print Chr(9) & curFile }U2[?  
        Next %3]3r*e&5  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. (P2[5d|  
        Dim nameArray() As String, sampName As String ~GNyE*t/Y  
        nameArray = Split(fList(0)," 0-0.txt") MB}:GY?  
        sampName  = nameArray(0) -6u H.  
        Print "" PfVEv *  
        Print "Sample name: " & Chr(9) & sampName w0#% AK  
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        'Open an output file and write the FRED header data 8lMZ  
        Dim outFile As String Rb{+Ki  
        outFile = cDir & sampName & "_FRED.txt" RM)1*l`!E  
        Open outFile For Output As #1 FpP\-+Sl  
        Print #1, "type bsdf_data" s ;48v  
        Print #1, "format angles=deg bsdf=value scale=1" k%"$$uo  
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        'Loop the file list, skip the two header lines and write the remaining data to file =ft9T&ciD  
        Dim lineArray() As String, curLine As Long }j& O/ Up  
        For Each curFile In fList OZ eiH X!  
            Print "Merging data from file " & curFile Bfbl#ZkyL  
            ReadFile( cDir & curFile, lineArray ) g;$E1U=R-E  
            For curLine = 2 To UBound(lineArray) w+Ad$4Pf"  
                Print #1, lineArray(curLine) gs$3)t  
            Next !.9l4@z#  
        Next RI?NB6U  
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        'Close the output file 6(:)otz  
        Close #1 ?A|zRj{  
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        Print "Finished merging RPC data for sample " & sampName Tsu\oJ[  
        Print "FRED formatted data file: " & Chr(9) & outFile ! &Z*yH  
    End Sub :RPVT,O}  
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    'Utility function to read the contents of a file into an array of strings. $Xf~# uH  
    Function ReadFile(ByVal fileName As String, _ X)I/%{  
                      ByRef lineArray() As String) As Long fv:L\N1u  
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        ReadFile = -1 wyp{KIV  
        Dim oFSO As Object L+_8QK<  
        Set oFSO = CreateObject("Scripting.FileSystemObject") r~I.F!{  
        Erase lineArray c qv .dC  
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        Dim fid As Long p#)e:/Qy  
        If oFSO.fileexists( fileName ) Then %?@x]B9Y8E  
            fid = FreeFile() bG52s  
            Open fileName For Input As fid Bhj:9%`  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 4>l0V<  
            Close fid fH&zR#T7U4  
        End If 2ed@HJu  
        Set oFSO = Nothing ;.\g-`jb  
        Return UBound( lineArray ) ACgt" M.3F  
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    End Function 9-B@GFB;8  
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    Sub GetFileList( ByVal in_dir As String, _ ehU"*9  
                     ByRef in_flist() As String ) ZHz^S)o\[s  
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        'Redimension the file list array vnDmFqelz  
        Erase in_flist Q^nG0<q+  
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        'Tracks how many files are found qv.n99?]  
        Dim fCount As Long +9TV:T  
        fCount = 0 g083J}08  
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        'Recurse directory and search for text files So?m?,!W  
        Dim f As String  70{RDj6{  
        f = Dir$(in_dir & "*.txt") 3zbXAR*  
        While f <> "" TWtC-wI;  
            ReDim Preserve in_flist(fCount) -E:(w<];  
            in_flist(fCount) = f -7&?@M,u  
            fCount += 1 <H!O:Mf_p  
            f = Dir$() - gB{:UYi3  
        Wend f0OgK<.>T  
        ReDim Preserve in_flist(fCount-1) ,|A{!j`  
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    End Sub wBLsz/  
     
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