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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 .#BWu(EYV  
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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 vwc)d{ND  
    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。 |o5F%1o  
    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。 zA<Hj;9SM  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 kN'.e*  
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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。 @An "ClDa  
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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) l+V#`S*q  
    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 F~C9,`#Wf@  
    例如下所示: Mu~DB:Y9e  
    Sample name:  EDF-C1-56 W/?\8AE  
    Merging data from file EDF-C1-56 0-0.txt (:TZ~"VY  
    Finished merging RPC data for sample EDF-C1-56 q|r/%[[!o  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt uy t'  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 kCuIEv@  
    a. 创建一个新的散射库 m:sT)  
    b. 散射模型命名 sC^9  
    c. 改变散射模型为“Tabulated BSDF”. w4"4(SR.  
    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 ) j)vfI>  
    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。 <h vVh9  
    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 iW\Q>~0#_  
    g. 点击OK :RqTbE4B  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 InCJ4D  
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    脚本代码 Af V a[{E  
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    '#Language "WWB-COM" r^2>60q'  
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    Option Explicit YR\pt8(z?  
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    Sub Main O:hCUr  
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        'Cleanup LKx<hl$O  
        ClearOutputWindow() $7~T+fmF  
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        Print "Merging RPC Photonics BSDF Data Files" e 2@{Ab  
        SetTextColor(255,0,0) F6vN{ FI  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ujt0?DM  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Te:4 z@?  
        SetTextColor(0,0,0) GCEcg&s=\S  
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        'Current directory of this script (should be the same as the text files being merged) vp#AD9h1  
        Dim cDir As String (oKrIm  
        cDir = MacroDir$ & "\" MeSF,*lP  
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        'Array which will be populated with the list of files to be merged <NVSF6`  
        Dim fList() As String, curFile As String ;YYo^9Lh}  
        GetFileList( cDir, fList ) a'U}.w}  
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        Print "" Jh)x_&R&Q  
        Print "Files found for merging:"  #"6O3.P  
        For Each curFile In fList K< ;I*cAX  
            Print Chr(9) & curFile Q`Z=}^  
        Next ZjEc\{ s  
    rda/  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. pm.Zc'23  
        Dim nameArray() As String, sampName As String x)h|!T=B~  
        nameArray = Split(fList(0)," 0-0.txt") j\o<r0I  
        sampName  = nameArray(0) z3\WcW7|  
        Print "" YaWZOuxm  
        Print "Sample name: " & Chr(9) & sampName Z/p>>SCak  
    }\s\fNSQ/  
        'Open an output file and write the FRED header data cKbjW  
        Dim outFile As String B]""%&! O  
        outFile = cDir & sampName & "_FRED.txt" &ml7368@  
        Open outFile For Output As #1 l4:5(1  
        Print #1, "type bsdf_data" 2^\67@9  
        Print #1, "format angles=deg bsdf=value scale=1" A5A4*.C  
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        'Loop the file list, skip the two header lines and write the remaining data to file "G&S`8  
        Dim lineArray() As String, curLine As Long p#yq'kY  
        For Each curFile In fList "Q>gQKgL  
            Print "Merging data from file " & curFile }#0i1]n$D  
            ReadFile( cDir & curFile, lineArray ) 6hW ~Q  
            For curLine = 2 To UBound(lineArray) g$(<wWsU  
                Print #1, lineArray(curLine) D #`o  
            Next \9Z1'W  
        Next gE_i#=bw  
    =.sg$VX  
        'Close the output file mw[  
        Close #1 ~g6`Cp`  
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        Print "Finished merging RPC data for sample " & sampName O>h,u[0  
        Print "FRED formatted data file: " & Chr(9) & outFile X*Qtbm,  
    End Sub 0pC}+ +  
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    'Utility function to read the contents of a file into an array of strings. '#;%=+=;  
    Function ReadFile(ByVal fileName As String, _ NQFMExg,  
                      ByRef lineArray() As String) As Long _~{Nco7T  
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        ReadFile = -1 nz?jNdyz  
        Dim oFSO As Object YM:;mX5B  
        Set oFSO = CreateObject("Scripting.FileSystemObject") vjzpU(Sq#  
        Erase lineArray G~ldU: ?  
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        Dim fid As Long S~ff<A>f  
        If oFSO.fileexists( fileName ) Then &$,%6X"  
            fid = FreeFile() 4dB6cg  
            Open fileName For Input As fid >R9_ ;  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) HZG^o^o1l+  
            Close fid j.b7<Vr4;  
        End If QXQ'QEG  
        Set oFSO = Nothing sM4Qu./  
        Return UBound( lineArray ) n' XvPV|  
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    End Function &7}\mnhB  
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    Sub GetFileList( ByVal in_dir As String, _ w6-A-M6hD  
                     ByRef in_flist() As String ) iPD5 KsAOA  
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        'Redimension the file list array u(Y! _  
        Erase in_flist 1feZ`P ;  
    %X--`91|u  
        'Tracks how many files are found {N \ri{|  
        Dim fCount As Long zm& D #)  
        fCount = 0 ;T9u$4 <  
    =u*\P!$  
        'Recurse directory and search for text files $RFy9(>  
        Dim f As String ae&i]K;  
        f = Dir$(in_dir & "*.txt") Y`O"+Jr  
        While f <> "" 3!&PI  
            ReDim Preserve in_flist(fCount) wc&`/'<p  
            in_flist(fCount) = f !vaS fL*]  
            fCount += 1 xD:t$~  
            f = Dir$() J$]-)`[G&  
        Wend fAW(  
        ReDim Preserve in_flist(fCount-1) S,=#b 4\#%  
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    End Sub Y]u6f c  
     
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