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    [分享]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: 2020-12-15
    摘要 ]J<2a`IK!  
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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 2|="!c8K  
    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。 ^]nnvvp  
    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。 Vz=ByyC  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 2oY.MQD7iW  
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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。 &G#LQl  
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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) +w'"N  
    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 *,C[yg1P  
    例如下所示: *t_"]v-w  
    Sample name:  EDF-C1-56 $!~R'N c  
    Merging data from file EDF-C1-56 0-0.txt #Az#dt]H  
    Finished merging RPC data for sample EDF-C1-56 BQX6Q<  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt %[1\d)  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 XUI9)Ne  
    a. 创建一个新的散射库 N)F&c!anh  
    b. 散射模型命名 pKSn 3-A  
    c. 改变散射模型为“Tabulated BSDF”. ;3 N0)  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 4r'QP .h  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 "6[a%f#Q  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 Y|'0bujr  
    g. 点击OK ll]MBq  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 4CUoXs'  
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    脚本代码 &E{CQ#k  
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    '#Language "WWB-COM" Xv1 SRP#  
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    Option Explicit y. xt7 F1  
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    Sub Main % oPt],>  
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        'Cleanup 0 _!')+  
        ClearOutputWindow() VR8 kY&  
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        Print "Merging RPC Photonics BSDF Data Files" 8R3x74fL  
        SetTextColor(255,0,0) 2)iwAu   
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 6MewQ{hi  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." xz$-_NWW  
        SetTextColor(0,0,0) UN FQ`L  
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        'Current directory of this script (should be the same as the text files being merged) 11'^JmKA  
        Dim cDir As String &dH[lB  
        cDir = MacroDir$ & "\" jOkc'  
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        'Array which will be populated with the list of files to be merged \ F\ /<  
        Dim fList() As String, curFile As String I]4L0r-  
        GetFileList( cDir, fList ) 2HNAB4 E  
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        Print "" [~aRA'qJ{V  
        Print "Files found for merging:" t!=qt*  
        For Each curFile In fList 6`c5\G+  
            Print Chr(9) & curFile B4D#T lB  
        Next 8 vp*U  
    KT 4h3D`,  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Bf21u 9  
        Dim nameArray() As String, sampName As String 9}[UZN6  
        nameArray = Split(fList(0)," 0-0.txt") G!u+~{g  
        sampName  = nameArray(0) *]7$/%.D  
        Print "" Jbv[Ql#  
        Print "Sample name: " & Chr(9) & sampName `{Jo>L .  
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        'Open an output file and write the FRED header data (&B`vgmb  
        Dim outFile As String &H4Y`xV^=  
        outFile = cDir & sampName & "_FRED.txt" Nv~H797B  
        Open outFile For Output As #1 u~C,x3yr  
        Print #1, "type bsdf_data" W0I)< S  
        Print #1, "format angles=deg bsdf=value scale=1" qxQuXF>:#  
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        'Loop the file list, skip the two header lines and write the remaining data to file < dD)>Y.  
        Dim lineArray() As String, curLine As Long *=2sXH1j  
        For Each curFile In fList |zkZF|-  
            Print "Merging data from file " & curFile up@I,9C/  
            ReadFile( cDir & curFile, lineArray ) /q^\g4J  
            For curLine = 2 To UBound(lineArray) u_Wftb?9  
                Print #1, lineArray(curLine) % tE#%;Z  
            Next *QGyF`Go{  
        Next 0Ym_l?]m[  
    ;4'pucq5/  
        'Close the output file m]?C @ina  
        Close #1 "c5bz  
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        Print "Finished merging RPC data for sample " & sampName lz [s  
        Print "FRED formatted data file: " & Chr(9) & outFile !U "?vSl  
    End Sub (-[73v-w  
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    'Utility function to read the contents of a file into an array of strings. n/6qc3\5i  
    Function ReadFile(ByVal fileName As String, _ ubQbEv{(,  
                      ByRef lineArray() As String) As Long *}P=7TuS  
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        ReadFile = -1 ls@j8bVv^  
        Dim oFSO As Object J Q% D6b  
        Set oFSO = CreateObject("Scripting.FileSystemObject") V{{Xz:   
        Erase lineArray &cSZ?0R  
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        Dim fid As Long s L=}d[  
        If oFSO.fileexists( fileName ) Then 9 S4bg7  
            fid = FreeFile() ccY! OSae  
            Open fileName For Input As fid 8W2oGL6  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) NVX@1}  
            Close fid BW x=Q  
        End If \|YIuzlO4  
        Set oFSO = Nothing J=t@2  
        Return UBound( lineArray ) mHF? t.y  
    '/'dg5bfV  
    End Function -(lCM/h  
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    Sub GetFileList( ByVal in_dir As String, _ "j/jhe6  
                     ByRef in_flist() As String ) w(oi6kg  
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        'Redimension the file list array sW&5Mu-  
        Erase in_flist x~u"KU2B  
    LEC=@) B  
        'Tracks how many files are found WD>z  
        Dim fCount As Long O8k+R@  
        fCount = 0 @q"HZO[  
    cd(YH! 3  
        'Recurse directory and search for text files yi;pn Z  
        Dim f As String s3[\&zt  
        f = Dir$(in_dir & "*.txt") ez14f$cJ+  
        While f <> "" 85_Qb2<'r  
            ReDim Preserve in_flist(fCount) d T7!+)s5-  
            in_flist(fCount) = f [.'9Sw  
            fCount += 1 2C AR2V|  
            f = Dir$() uE,g|51H/  
        Wend ~X<?&;6  
        ReDim Preserve in_flist(fCount-1) Yy'CBIq#f  
    (>SucUU  
    End Sub P?hB`5X  
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