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    [分享]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: 2020-12-15
    摘要 5 +Ei! E89  
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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 8,0WHivg  
    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。 >;$C@  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 /Vg=+FEO  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 lhx"<kR 4  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 JZa^GW:YQh  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) eWgqds&#  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 \-]zXKl2k  
    例如下所示: e;*GbXd|  
    Sample name:  EDF-C1-56 =02$Dwr  
    Merging data from file EDF-C1-56 0-0.txt :"vW;$1 }  
    Finished merging RPC data for sample EDF-C1-56 4dEfXrMf  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 0bR)]"K  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 nE 2w ?  
    a. 创建一个新的散射库 H8'q Y  
    b. 散射模型命名 7z_EX8^  
    c. 改变散射模型为“Tabulated BSDF”. 8l?mNapy  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) EO_:C9=d{  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 y.xyr"-Q  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 8NE+G.:G  
    g. 点击OK Yq$KYB j  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 r+0<A.''a  
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    脚本代码 UgVLHwkvk  
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    '#Language "WWB-COM" )V6Bzn}9  
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    Option Explicit pZ@)9c  
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    Sub Main 3Uy48ue  
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        'Cleanup 61[ 8I},V  
        ClearOutputWindow() Q{:5gh  
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        Print "Merging RPC Photonics BSDF Data Files" M2$.Y om[  
        SetTextColor(255,0,0) S`\03(zDA  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." I: L}7uA[t  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." uZg[PS=@!X  
        SetTextColor(0,0,0) dr[sSBTY"  
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        'Current directory of this script (should be the same as the text files being merged) $ #*";b)QY  
        Dim cDir As String tbH` VD"u  
        cDir = MacroDir$ & "\" yMd<<:Ap  
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        'Array which will be populated with the list of files to be merged ]UMt  
        Dim fList() As String, curFile As String 6XFLWN-)  
        GetFileList( cDir, fList ) PXx:JZsju  
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        Print "" +=V[7^K;  
        Print "Files found for merging:" r*r3QsO  
        For Each curFile In fList &P0jRT3e#Y  
            Print Chr(9) & curFile ?_@_NV MY  
        Next z>6hK:27  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. _oILZ,  
        Dim nameArray() As String, sampName As String \C&[BQ\  
        nameArray = Split(fList(0)," 0-0.txt") )Z"  
        sampName  = nameArray(0) Jn#05Z  
        Print "" eXYf"hU,  
        Print "Sample name: " & Chr(9) & sampName l!d |luqbA  
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        'Open an output file and write the FRED header data M SnRx*-  
        Dim outFile As String HkL:3 E.  
        outFile = cDir & sampName & "_FRED.txt" \{@n >Mh  
        Open outFile For Output As #1 BKV,V/*p  
        Print #1, "type bsdf_data" moOc G3=9  
        Print #1, "format angles=deg bsdf=value scale=1" C5F=J8pY  
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        'Loop the file list, skip the two header lines and write the remaining data to file L%CBz]`  
        Dim lineArray() As String, curLine As Long n | M~C\*  
        For Each curFile In fList 'Zket=Sm;  
            Print "Merging data from file " & curFile &*JU N}86  
            ReadFile( cDir & curFile, lineArray ) 7;i [  
            For curLine = 2 To UBound(lineArray) 0#d:<+4D  
                Print #1, lineArray(curLine) T!yI+<  
            Next e|e"lP  
        Next =>LQW;Sjz  
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        'Close the output file _X6@.sM/2  
        Close #1 1zP)~p3a  
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        Print "Finished merging RPC data for sample " & sampName ZYexW=@  
        Print "FRED formatted data file: " & Chr(9) & outFile b;5&V_  
    End Sub {@7xOOAw  
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    'Utility function to read the contents of a file into an array of strings. DCheG7lo{  
    Function ReadFile(ByVal fileName As String, _ NRI @M5  
                      ByRef lineArray() As String) As Long unB`n'L  
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        ReadFile = -1 %jErLg  
        Dim oFSO As Object Gv+$7{  
        Set oFSO = CreateObject("Scripting.FileSystemObject") >>b <)?3Rv  
        Erase lineArray /Pyj|!C3`q  
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        Dim fid As Long oO4hBM([  
        If oFSO.fileexists( fileName ) Then /7fD;H^*  
            fid = FreeFile() (Zz8 ldO  
            Open fileName For Input As fid 3Ow bU  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) L']"I^( N  
            Close fid xh:A*ZI=7  
        End If [lz#+~rOS  
        Set oFSO = Nothing Wi+}qO  
        Return UBound( lineArray ) PY76;D*`  
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    End Function V]5MIiNl  
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    Sub GetFileList( ByVal in_dir As String, _ yBl9a-2A  
                     ByRef in_flist() As String ) %5 ovW<E:  
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        'Redimension the file list array ^:u-wr8?{  
        Erase in_flist $z[@DB[  
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        'Tracks how many files are found NA!?.zn  
        Dim fCount As Long cw/E?0MWb  
        fCount = 0 ufn% sA  
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        'Recurse directory and search for text files v];P| Fi  
        Dim f As String GCj[ySCD  
        f = Dir$(in_dir & "*.txt") \#!B*:u  
        While f <> "" MS`XhFPS.  
            ReDim Preserve in_flist(fCount) cb5T-'hY  
            in_flist(fCount) = f `rest_vu  
            fCount += 1 _A~>?gJ;,  
            f = Dir$() O<P(UT"  
        Wend _-|+k  
        ReDim Preserve in_flist(fCount-1) x8o/m$[,=u  
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    End Sub gx.\&W b  
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