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    [分享]RPC Photonics扩散片BSDF [复制链接]

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    离线infotek
     
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    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 ^|gD;OED7O  
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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 E:(DidSE@  
    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。 c<fl6o)  
    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。 xim'TVwvC  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ?$J#jhR?  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 sYE|  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ?g+uJf  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 L.X"wIs^  
    例如下所示: '(fQtQ%  
    Sample name:  EDF-C1-56 j2^Vz{  
    Merging data from file EDF-C1-56 0-0.txt &!N9.e:-]  
    Finished merging RPC data for sample EDF-C1-56 RA^6c![  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 2K wr=t  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 F}MjZZj(U=  
    a. 创建一个新的散射库 =e*S h0dK  
    b. 散射模型命名 C( wZj O?N  
    c. 改变散射模型为“Tabulated BSDF”. "!,)Pv  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) `cgyiJ  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 (}*1,N!#  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 4f SG c8  
    g. 点击OK Zmx[:-  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 (_IPz)F  
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    脚本代码 ;Vv.$mI  
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    '#Language "WWB-COM" n~_;tO  
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    Option Explicit ?hBjq  
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    Sub Main Tji*\<?  
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        'Cleanup Q{= DLm`  
        ClearOutputWindow() _D"V^4^yqu  
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        Print "Merging RPC Photonics BSDF Data Files" )kIZm Q|f1  
        SetTextColor(255,0,0) Fzmc#?  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." JO-FnoQK  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." s+0n0C  
        SetTextColor(0,0,0) yByxy-~  
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        'Current directory of this script (should be the same as the text files being merged) 2=IZD `{!  
        Dim cDir As String br;~}GR_h  
        cDir = MacroDir$ & "\" s7?d_+O  
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        'Array which will be populated with the list of files to be merged Q3<ctd\]Y  
        Dim fList() As String, curFile As String aOhi<I`*  
        GetFileList( cDir, fList ) p54 e'Zb  
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        Print "" .k!<Oqa  
        Print "Files found for merging:" |BEoF[1  
        For Each curFile In fList ;q?WU>c{?  
            Print Chr(9) & curFile T-F8[dd^/  
        Next *JArR1J  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ^V0I!&7lx  
        Dim nameArray() As String, sampName As String sjy/[.4-  
        nameArray = Split(fList(0)," 0-0.txt") OE/r0C<&  
        sampName  = nameArray(0) ]u|5ZCv0  
        Print "" * `3+x  
        Print "Sample name: " & Chr(9) & sampName e'X"uH Xt.  
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        'Open an output file and write the FRED header data B-p ].  
        Dim outFile As String NCp]!=uM;  
        outFile = cDir & sampName & "_FRED.txt" /"@k_[O  
        Open outFile For Output As #1 Lvb'qZ6n  
        Print #1, "type bsdf_data" &ox5eX(  
        Print #1, "format angles=deg bsdf=value scale=1" AzMX~cd  
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        'Loop the file list, skip the two header lines and write the remaining data to file a\m0X@Q  
        Dim lineArray() As String, curLine As Long ;"2(e7ir  
        For Each curFile In fList Wgm{ ]9Q  
            Print "Merging data from file " & curFile 1}q(Pn2  
            ReadFile( cDir & curFile, lineArray ) Bq~?!~\?.  
            For curLine = 2 To UBound(lineArray) nNhb,J  
                Print #1, lineArray(curLine) ZMEYF!j N  
            Next lm8<0*;,  
        Next ts &sr  
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        'Close the output file wV q4DE  
        Close #1 OzV|z/R2'  
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        Print "Finished merging RPC data for sample " & sampName <z QUa  
        Print "FRED formatted data file: " & Chr(9) & outFile _| >bOI  
    End Sub 4oPr|OKj{*  
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    'Utility function to read the contents of a file into an array of strings. Z8:'_#^@a[  
    Function ReadFile(ByVal fileName As String, _ ;y.<I&  
                      ByRef lineArray() As String) As Long <3 I0$?xL  
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        ReadFile = -1 Zr|\T7w 3  
        Dim oFSO As Object oz'^.+uvE  
        Set oFSO = CreateObject("Scripting.FileSystemObject") m^;A]0h+  
        Erase lineArray |?LUt@r;  
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        Dim fid As Long K 5AArI  
        If oFSO.fileexists( fileName ) Then uDMyO<\  
            fid = FreeFile() Bg}(Sy  
            Open fileName For Input As fid n==+NL  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) oF.H?lG7`  
            Close fid U=N]XwjVK<  
        End If W;T (q~XK  
        Set oFSO = Nothing d[&Ah~,  
        Return UBound( lineArray ) i&Me7=~  
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    End Function oN[# C>#(  
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    Sub GetFileList( ByVal in_dir As String, _ GD<pqm`vVY  
                     ByRef in_flist() As String ) H8$";T(I  
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        'Redimension the file list array g?9%_&/})A  
        Erase in_flist ~p$ncIr2Q  
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        'Tracks how many files are found Y#fiJ  
        Dim fCount As Long A[N>T\  
        fCount = 0 z1LY|8$G  
    }>m3V2>[  
        'Recurse directory and search for text files {ud^+I&  
        Dim f As String (^= Hq'D  
        f = Dir$(in_dir & "*.txt") MJ~)CiKgN  
        While f <> "" V2*m/JyeB  
            ReDim Preserve in_flist(fCount) eo'C)j# U  
            in_flist(fCount) = f  DZ&AwF  
            fCount += 1 6N'HXL UlQ  
            f = Dir$() (N$$N:ac[t  
        Wend v QL)I  
        ReDim Preserve in_flist(fCount-1) 6WEu(}=  
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    End Sub $:<G=  
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