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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: 07-22
    摘要 MqA%hlq  
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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 t,CC~  
    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。 {'(1c)q>  
    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。 DM*GvBdR  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤  G{4~{{tI  
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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。 Yh^~4S?  
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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) cwe@W PE2  
    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 HizMjJ|  
    例如下所示: c= f _  
    Sample name:  EDF-C1-56 hvc%6A\nm  
    Merging data from file EDF-C1-56 0-0.txt -~wGJM VA  
    Finished merging RPC data for sample EDF-C1-56 L%3m_'6QP  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt iJIDx9 )Z  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 n_8wYiBs(  
    a. 创建一个新的散射库 ^:c:~F6J  
    b. 散射模型命名 >'qkW$-95  
    c. 改变散射模型为“Tabulated BSDF”. Gp<7i5  
    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 ) > `uk2QdC  
    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。 {e>E4(  
    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 #5Zf6w  
    g. 点击OK ]GSs{'Uh B  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 s :4<wmu4=  
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    脚本代码 \5k^zGF4o  
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    '#Language "WWB-COM" Iy2KOv@a5  
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    Option Explicit $U{ \T4  
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    Sub Main vCPiT2G  
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        'Cleanup 9}\{0;9  
        ClearOutputWindow() 2N,<~L`FX'  
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        Print "Merging RPC Photonics BSDF Data Files" ]i}3`e?  
        SetTextColor(255,0,0) >:2Br(S  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." d#?.G3YmK  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." jK#[r[q{  
        SetTextColor(0,0,0) )^G&p[G  
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        'Current directory of this script (should be the same as the text files being merged) s@WF[S7D  
        Dim cDir As String [c{/0*  
        cDir = MacroDir$ & "\" > @Ux8#  
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        'Array which will be populated with the list of files to be merged ws{2 0  
        Dim fList() As String, curFile As String kQr\ktN\  
        GetFileList( cDir, fList ) (A6 -9g>  
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        Print "" Tug}P K   
        Print "Files found for merging:" 5<?O S &B  
        For Each curFile In fList (#4   
            Print Chr(9) & curFile ]yTMWIx#  
        Next ql|ksios  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 9M$=X-  
        Dim nameArray() As String, sampName As String NAy3Zd}  
        nameArray = Split(fList(0)," 0-0.txt") :d&^//9  
        sampName  = nameArray(0) ]5!}S-uJq  
        Print "" L5E|1T  
        Print "Sample name: " & Chr(9) & sampName t-xw=&!w  
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        'Open an output file and write the FRED header data *?k~n9n5U  
        Dim outFile As String Lyx \s;  
        outFile = cDir & sampName & "_FRED.txt" :/Zy=F9:  
        Open outFile For Output As #1 S 1%/ee3  
        Print #1, "type bsdf_data" S{ v [65  
        Print #1, "format angles=deg bsdf=value scale=1" i.0}d5Y  
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        'Loop the file list, skip the two header lines and write the remaining data to file sC8C><y  
        Dim lineArray() As String, curLine As Long I?) .D?o  
        For Each curFile In fList ^Fy{Q*p`(  
            Print "Merging data from file " & curFile l?+67cQLA  
            ReadFile( cDir & curFile, lineArray ) MjO.s+I  
            For curLine = 2 To UBound(lineArray) V b=Oz  
                Print #1, lineArray(curLine) mN_KAln  
            Next 07zbx6:t  
        Next g$++\%k&  
    piZ0KA"  
        'Close the output file |@J:A!  
        Close #1 CM; r\,o  
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        Print "Finished merging RPC data for sample " & sampName xMk0Xf'_  
        Print "FRED formatted data file: " & Chr(9) & outFile Cf-R?gn]  
    End Sub vd@ _LcK  
    ^Vl{IsY  
    'Utility function to read the contents of a file into an array of strings. QEl:>HG  
    Function ReadFile(ByVal fileName As String, _ 4g}eqW  
                      ByRef lineArray() As String) As Long NJEubC?  
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        ReadFile = -1 __}j {Buk  
        Dim oFSO As Object F_m[EB  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 9=(*#gRd  
        Erase lineArray  ~ccwu  
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        Dim fid As Long u$7o d$&S  
        If oFSO.fileexists( fileName ) Then e8HGST`  
            fid = FreeFile() _m;#+`E  
            Open fileName For Input As fid P4{8pO]B  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) _Y7uM6HL\  
            Close fid l{:7*U{d  
        End If 3JB?G>\!  
        Set oFSO = Nothing [25[c><:w"  
        Return UBound( lineArray ) /8Sg<  
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    End Function 7J ~usF>A  
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    Sub GetFileList( ByVal in_dir As String, _ /D]?+<h1  
                     ByRef in_flist() As String ) l_K=7\N  
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        'Redimension the file list array 8IErLu}  
        Erase in_flist #G[S  
    +|#lUXC  
        'Tracks how many files are found |sf&t  
        Dim fCount As Long -)biSU,  
        fCount = 0 -L;sv0  
    5PY,}1`  
        'Recurse directory and search for text files _*d8:|qw  
        Dim f As String oyQp"'|N  
        f = Dir$(in_dir & "*.txt") !f 7CN<  
        While f <> "" 9M3XHj  
            ReDim Preserve in_flist(fCount) +!dWQ=W  
            in_flist(fCount) = f (vX+ Yw  
            fCount += 1 i:9f#  
            f = Dir$() muMb pF  
        Wend m+y5Q&;f  
        ReDim Preserve in_flist(fCount-1) K `|%-k+D  
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    End Sub :VP*\K/:  
     
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