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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 ./6L&?*`~;  
    Ek 4aC3  
    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 Xu'u"amt  
    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。  e%qMrR  
    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。 OixQlAb{  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ;hKn$' '  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 %;zA_Wg  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 6L*y$e"Qc  
    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 B[Tw0rQ  
    例如下所示: *{tJ3<t(1  
    Sample name:  EDF-C1-56 =g&0CFF<  
    Merging data from file EDF-C1-56 0-0.txt Nl(Aa5:!  
    Finished merging RPC data for sample EDF-C1-56 V^f'4*~'  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt H%/$Rqg  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Ru sa &#[  
    a. 创建一个新的散射库 -Y+[`0$'  
    b. 散射模型命名 %i^%D  
    c. 改变散射模型为“Tabulated BSDF”. vF*H5\ m<a  
    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 ) 5v?6J#]2  
    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。 *rqih_j0  
    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 CqF< BE  
    g. 点击OK SR\#>Qwx_  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 .Oim7JQ8  
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    脚本代码 TX 12$p\  
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    '#Language "WWB-COM" LtNG<n)_BH  
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    Option Explicit [OM Kk#vW  
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    Sub Main bbnAF*7s8  
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        'Cleanup 3<Cd >o.  
        ClearOutputWindow() 8T1`TGSFC  
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        Print "Merging RPC Photonics BSDF Data Files" ZL@7Mr!e  
        SetTextColor(255,0,0) fXL$CgXG\x  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." =JEnK_@?K\  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." !.F`8OD`u  
        SetTextColor(0,0,0) id*UTY Tg  
    8rw;Yo<k  
        'Current directory of this script (should be the same as the text files being merged) QPGssQR6  
        Dim cDir As String s=28.  
        cDir = MacroDir$ & "\" V&qXsyg  
    ?X=9@m  
        'Array which will be populated with the list of files to be merged u(d>R5}'  
        Dim fList() As String, curFile As String ;B tRDKn  
        GetFileList( cDir, fList ) gBrIqM i5  
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        Print "" /LJ?JwAvg5  
        Print "Files found for merging:" >yT:eG  
        For Each curFile In fList *S ;v406  
            Print Chr(9) & curFile )L^WD$"'Q  
        Next Prr<:q  
    [=XsI]B\  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 3"q%-M|+Q  
        Dim nameArray() As String, sampName As String ZfMJU  
        nameArray = Split(fList(0)," 0-0.txt") `<[Zs]Fe4  
        sampName  = nameArray(0) 2< ^B]N  
        Print "" 9B<y w.  
        Print "Sample name: " & Chr(9) & sampName Q:tW LVE#0  
    C[wnor!  
        'Open an output file and write the FRED header data A*@!tz<  
        Dim outFile As String 0Wk}d(f  
        outFile = cDir & sampName & "_FRED.txt" =#uXO<   
        Open outFile For Output As #1 RN!oflb  
        Print #1, "type bsdf_data" haB$W 4x  
        Print #1, "format angles=deg bsdf=value scale=1" Kx#G_N@  
    '9i:b]Hru  
        'Loop the file list, skip the two header lines and write the remaining data to file e}7qZ^  
        Dim lineArray() As String, curLine As Long -6Cxz./#yS  
        For Each curFile In fList 5$N4< Lo7  
            Print "Merging data from file " & curFile -O-_F6p'D  
            ReadFile( cDir & curFile, lineArray ) E-&=I> B5  
            For curLine = 2 To UBound(lineArray) ]%G[<zD,1  
                Print #1, lineArray(curLine) 6nxf <1  
            Next F*hs3b0Db  
        Next dB< \X.   
    ou@Dd4  
        'Close the output file wgI$'tI  
        Close #1 AnIENJ  
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        Print "Finished merging RPC data for sample " & sampName >b<br  
        Print "FRED formatted data file: " & Chr(9) & outFile pH)V:BmJ  
    End Sub l6a,:*_  
    {8b6A~/  
    'Utility function to read the contents of a file into an array of strings. B*,9{g0m/  
    Function ReadFile(ByVal fileName As String, _ %vyjn&13  
                      ByRef lineArray() As String) As Long R1A!ob  
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        ReadFile = -1 e>"{nOY4  
        Dim oFSO As Object >.~^(  
        Set oFSO = CreateObject("Scripting.FileSystemObject") c_&iGQ  
        Erase lineArray L +-B,466  
    O!uX:TE|Q  
        Dim fid As Long T4._S:~  
        If oFSO.fileexists( fileName ) Then K*p^Gs,  
            fid = FreeFile() a\^DthZ!;|  
            Open fileName For Input As fid \y#gh95  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) eEupqOF*:W  
            Close fid f`H}Y!W(  
        End If P2f~sx9  
        Set oFSO = Nothing !!dNp5h`  
        Return UBound( lineArray ) N2=gSEY  
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    End Function \)`\F$CF  
    0Tg/R4dI  
    Sub GetFileList( ByVal in_dir As String, _ CP/`ON  
                     ByRef in_flist() As String ) aCy2 .Qn  
    =DvnfT<  
        'Redimension the file list array "X"DTP1b  
        Erase in_flist 6BNOF66kH  
    ,8EeSnI  
        'Tracks how many files are found Cz m`5  
        Dim fCount As Long ]r6,^"  
        fCount = 0 nA5v+d-<T  
    &c?-z}=G  
        'Recurse directory and search for text files 8_mdh+  
        Dim f As String a!xKS8-S==  
        f = Dir$(in_dir & "*.txt") aW$7:<A{  
        While f <> "" nBZqhtr  
            ReDim Preserve in_flist(fCount) *>zr'Tt,W  
            in_flist(fCount) = f GP[;+xMBh  
            fCount += 1 7@|(z:uw  
            f = Dir$() H&`p9d*(e  
        Wend vQYd!DSh  
        ReDim Preserve in_flist(fCount-1) x w]Zo<F  
    `N ;!=7y7Y  
    End Sub NTls64AS.  
     
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