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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 正序阅读 楼主  发表于: 07-22
    摘要 y7Hoy.(  
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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 }Am5b@g"$Y  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 v&sl_w/tn  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 >h$Q%w{V  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ?*~sx=mC  
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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。 Y3H5}4QD  
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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) G4\|bwh  
    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,UOP[j  
    例如下所示: E<@N4%K_Q  
    Sample name:  EDF-C1-56 Q5Epq sKyC  
    Merging data from file EDF-C1-56 0-0.txt BxaGBK<k  
    Finished merging RPC data for sample EDF-C1-56 UsdMCJ&G  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt *bzqH2h8  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ^W~8)Rbf  
    a. 创建一个新的散射库 ~1nKL0C6u  
    b. 散射模型命名 D&OskM60  
    c. 改变散射模型为“Tabulated BSDF”. Bc'Mj=>;  
    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 ) 3XDuo|(  
    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。 7zowvE?#  
    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 4rpry@1  
    g. 点击OK "1 UpoF'w  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 \:2z!\iP`  
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    脚本代码 CQ7NQ^3k  
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    '#Language "WWB-COM" ('o} EoXS  
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    Option Explicit XQ8q)B=  
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    Sub Main Yaz/L)Y;R  
    28 zZ3|Z3  
        'Cleanup }%D${.R]  
        ClearOutputWindow() ~Q}!4LH  
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        Print "Merging RPC Photonics BSDF Data Files" }[(v(1j='~  
        SetTextColor(255,0,0)  6NSSuK3  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 8EBd`kiq  
        Print "Note: Do not run this script multiple times without deleting the output file between executions."  %\~U>3Q  
        SetTextColor(0,0,0) 8fK/0u^`d  
    9~y:K$NO  
        'Current directory of this script (should be the same as the text files being merged) $lA dh  
        Dim cDir As String 3#eAXIW[  
        cDir = MacroDir$ & "\" v@{VQVx  
    **.23<n^W  
        'Array which will be populated with the list of files to be merged 3Zwhv+CP[  
        Dim fList() As String, curFile As String D$E#:[  
        GetFileList( cDir, fList ) l8e)|MSh  
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        Print "" +{#Z^y6&  
        Print "Files found for merging:" Bm<tCN-4  
        For Each curFile In fList 9Q\RCl_1  
            Print Chr(9) & curFile qggRS)a  
        Next 4JXJ0T ar  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. {aUv>T"c  
        Dim nameArray() As String, sampName As String b`f6(6  
        nameArray = Split(fList(0)," 0-0.txt") s4Vju/  
        sampName  = nameArray(0) j,z)x[3}  
        Print "" XXeDOrb  
        Print "Sample name: " & Chr(9) & sampName A$L:,b(  
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        'Open an output file and write the FRED header data (!Xb8rV0_  
        Dim outFile As String >ul&x!?@  
        outFile = cDir & sampName & "_FRED.txt" J/PK #<  
        Open outFile For Output As #1 r$Ik* R  
        Print #1, "type bsdf_data" dTte4lh  
        Print #1, "format angles=deg bsdf=value scale=1" ft0tRv(s:  
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        'Loop the file list, skip the two header lines and write the remaining data to file nP|ah~ q  
        Dim lineArray() As String, curLine As Long 1[- `*Ph  
        For Each curFile In fList ?v'CuWS  
            Print "Merging data from file " & curFile C IRMAX  
            ReadFile( cDir & curFile, lineArray ) IoV"t,  
            For curLine = 2 To UBound(lineArray) 5glEV`.je  
                Print #1, lineArray(curLine) e)3Mg^  
            Next ;ZkY[5  
        Next /AY q^  
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        'Close the output file ZVit] 3hd  
        Close #1 /nEK|.j  
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        Print "Finished merging RPC data for sample " & sampName ?9?o8!  
        Print "FRED formatted data file: " & Chr(9) & outFile Ok}e|b[D  
    End Sub n7zM;@{7  
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    'Utility function to read the contents of a file into an array of strings. gV*4{ d`  
    Function ReadFile(ByVal fileName As String, _ x}x)h3e  
                      ByRef lineArray() As String) As Long ^;?w<9Y  
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        ReadFile = -1 "cbJ{ G1pk  
        Dim oFSO As Object !"aGo1 $$  
        Set oFSO = CreateObject("Scripting.FileSystemObject") {96NtR0Z  
        Erase lineArray y5VohVa`  
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        Dim fid As Long nFro#qx  
        If oFSO.fileexists( fileName ) Then {7v|\6@e3  
            fid = FreeFile() Z+4Mo*#  
            Open fileName For Input As fid ZvK3Su)f1  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ?*<1B  
            Close fid %f(4jQ0I  
        End If  U8% IpI;  
        Set oFSO = Nothing VRHS 4  
        Return UBound( lineArray ) &?']EcU5h9  
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    End Function >z,Y%A  
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    Sub GetFileList( ByVal in_dir As String, _ s"8z q ;)  
                     ByRef in_flist() As String ) OSom-?|w  
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        'Redimension the file list array LOgB_$9_3  
        Erase in_flist Eh"Y<]$  
    "#{b)!EH  
        'Tracks how many files are found 2"o <>d  
        Dim fCount As Long Q1H.2JXr  
        fCount = 0 .&K?@T4l  
    _sHeB7K  
        'Recurse directory and search for text files dtXtZ!g2  
        Dim f As String $A(3-n5=  
        f = Dir$(in_dir & "*.txt") l 5f'R  
        While f <> "" ?w)A`G_  
            ReDim Preserve in_flist(fCount) Q"qJ0f)  
            in_flist(fCount) = f FE06,i\{  
            fCount += 1 TJ,?C$3  
            f = Dir$() wOH 3[SKo  
        Wend u4[JDB7tH  
        ReDim Preserve in_flist(fCount-1) E,4*a5Fi  
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    End Sub \;"S>dg  
     
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