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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 tuSgh!  
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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 ) AIZE?oX  
    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。 1C{~!=6#  
    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。 H#D=vx'  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 zob-z=='  
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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。 FoLw S%+yO  
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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) y? g7sLDc  
    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 WJ@,f%=<~  
    例如下所示: 9}-,dgAB  
    Sample name:  EDF-C1-56 <fxYTd<#D[  
    Merging data from file EDF-C1-56 0-0.txt (\T?p9  
    Finished merging RPC data for sample EDF-C1-56 xab[  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ?@#<>7V  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Xo,BuK&G  
    a. 创建一个新的散射库 G2rvi=8=  
    b. 散射模型命名 V2*b f`/V  
    c. 改变散射模型为“Tabulated BSDF”. Hd:ZE::Q'#  
    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 ) LX8vVj8K  
    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。 4PdFq*A  
    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 1g@kHq  
    g. 点击OK z y.Ok 49  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 laAG%lq/'  
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    脚本代码 `is6\RH  
    {974m` 5  
    '#Language "WWB-COM" @"6BvGU2s  
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    Option Explicit 6Z3v]X  
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    Sub Main &EMm<(.]a  
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        'Cleanup hZy"@y3Yq  
        ClearOutputWindow() (\G~S 4  
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        Print "Merging RPC Photonics BSDF Data Files" _L"rygit  
        SetTextColor(255,0,0) mU*GcWbc+  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." K3jno+U&  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." e}kG1C8  
        SetTextColor(0,0,0) d;>:<{z@CD  
    ?p5Eo{B  
        'Current directory of this script (should be the same as the text files being merged) &B) F_EI  
        Dim cDir As String Y$N|p{Z  
        cDir = MacroDir$ & "\" 1{A 4_/R  
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        'Array which will be populated with the list of files to be merged pDu~84!])  
        Dim fList() As String, curFile As String '  _N >  
        GetFileList( cDir, fList ) .EI/0"^  
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        Print "" 1$c*/Tc:E  
        Print "Files found for merging:" .AKx8=f  
        For Each curFile In fList 0^;{b^!(  
            Print Chr(9) & curFile C?z C|0  
        Next *d@}'De{8  
    :`_wy-}V  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. bo]k9FC  
        Dim nameArray() As String, sampName As String /OViqZ;9  
        nameArray = Split(fList(0)," 0-0.txt") tJ 6:$dh  
        sampName  = nameArray(0) (A1!)c  
        Print "" FrB19  
        Print "Sample name: " & Chr(9) & sampName U\51j  
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        'Open an output file and write the FRED header data 2-8<uUy  
        Dim outFile As String rt"\\sOlMB  
        outFile = cDir & sampName & "_FRED.txt" 7m1*Q@D  
        Open outFile For Output As #1 Y#uf 2>J  
        Print #1, "type bsdf_data" \"n&|_SZ\  
        Print #1, "format angles=deg bsdf=value scale=1" nHA2p`T  
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        'Loop the file list, skip the two header lines and write the remaining data to file n] &fod  
        Dim lineArray() As String, curLine As Long ] $5rh8  
        For Each curFile In fList z2-=fIr.h  
            Print "Merging data from file " & curFile ?L|@{RS{|  
            ReadFile( cDir & curFile, lineArray ) *@n%K,$v  
            For curLine = 2 To UBound(lineArray) Xc'yz 2B  
                Print #1, lineArray(curLine) ym-212wl  
            Next J)*y1   
        Next K 5!k06;s  
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        'Close the output file J`\%'pEn  
        Close #1 zVp|%&  
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        Print "Finished merging RPC data for sample " & sampName (R.k.,z  
        Print "FRED formatted data file: " & Chr(9) & outFile a "8/y4Y  
    End Sub @UD6qA  
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    'Utility function to read the contents of a file into an array of strings. TMGZHOAt  
    Function ReadFile(ByVal fileName As String, _ &7}-Xvc  
                      ByRef lineArray() As String) As Long #t9&X8:U  
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        ReadFile = -1 6=FF*"-6E  
        Dim oFSO As Object nJrV  
        Set oFSO = CreateObject("Scripting.FileSystemObject") yh} V u  
        Erase lineArray 24]O0K  
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        Dim fid As Long 0YW<>Y`6  
        If oFSO.fileexists( fileName ) Then TqCzpf&&h/  
            fid = FreeFile() !k Hpw2  
            Open fileName For Input As fid u2o6EU`  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) s}UPe)Vu  
            Close fid RKRk,jRL  
        End If E+csK*A7  
        Set oFSO = Nothing Gh|q[s*k  
        Return UBound( lineArray ) `[[ A 7  
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    End Function KK/~W  
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    Sub GetFileList( ByVal in_dir As String, _ 0!\pS{$zB  
                     ByRef in_flist() As String ) yG{'hx6H  
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        'Redimension the file list array ?;!l-Dy  
        Erase in_flist ,C!MHn^$  
    ,}F{V>dhn  
        'Tracks how many files are found Y[@$1{YS  
        Dim fCount As Long =[3I#s?V  
        fCount = 0 `G6Nk@9.  
    NgQ {'H[Y  
        'Recurse directory and search for text files ,"5Fw4G6*  
        Dim f As String PudwcP {  
        f = Dir$(in_dir & "*.txt") @<r  ;>G  
        While f <> "" yLG`tU1  
            ReDim Preserve in_flist(fCount) HS>Z6|uLY  
            in_flist(fCount) = f Q(>89*b&  
            fCount += 1 |'Z6M];8t  
            f = Dir$() 5o'V}  
        Wend 44]/rP_m  
        ReDim Preserve in_flist(fCount-1) u6$fF=  
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    End Sub 9!}&&]Q`  
     
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