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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 HhWwc#B  
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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 %%as>}.  
    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。 Lov.E3S6;  
    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。 :^H9W^2  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 #0?"J)  
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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。 # Z|%0r_~  
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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) S om. qD  
    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 8Fd1;G6  
    例如下所示: sd]54&3A  
    Sample name:  EDF-C1-56 c YM CfP  
    Merging data from file EDF-C1-56 0-0.txt N?a1sdR  
    Finished merging RPC data for sample EDF-C1-56 ;z.6'EYMG  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Jb3>vCIn  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 $ ] W[y=  
    a. 创建一个新的散射库 6z9R1&~%  
    b. 散射模型命名 a%Z4_ToLZ  
    c. 改变散射模型为“Tabulated BSDF”. `W"a! ,s2  
    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 ) K-2o9No?j`  
    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。 OX)#F'Sl}  
    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 &TP:yA[  
    g. 点击OK %w'/n>]j  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 4i_spF-3  
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    脚本代码 %uGleY]~  
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    '#Language "WWB-COM" pBSq%Hy:  
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    Option Explicit --in+  
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    Sub Main l-<3{!  
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        'Cleanup r/mA2  
        ClearOutputWindow() :`+|'*b(A  
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        Print "Merging RPC Photonics BSDF Data Files" &K5C=]4  
        SetTextColor(255,0,0) t{/:(Nu  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." =oo[ Eyr  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." r+t ,J|V  
        SetTextColor(0,0,0) cr76cYq"Q  
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        'Current directory of this script (should be the same as the text files being merged) A#v|@sul  
        Dim cDir As String d{QMST2&  
        cDir = MacroDir$ & "\" vC{ h2A  
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        'Array which will be populated with the list of files to be merged \p5|}<Sr)  
        Dim fList() As String, curFile As String J"%8:pL  
        GetFileList( cDir, fList ) 0zg2g!lh  
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        Print "" I*^5'N'  
        Print "Files found for merging:" lq:]`l,6@  
        For Each curFile In fList 8K|J:[7  
            Print Chr(9) & curFile W*YxBn4  
        Next Ap11b|v  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. EfFz7j&X  
        Dim nameArray() As String, sampName As String Gx.P ]O3  
        nameArray = Split(fList(0)," 0-0.txt") Iq)(UfaSve  
        sampName  = nameArray(0) cwk+#ur  
        Print "" "Z;~Y=hC13  
        Print "Sample name: " & Chr(9) & sampName rei 8LW  
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        'Open an output file and write the FRED header data IZO@V1-m  
        Dim outFile As String fx<FIj7  
        outFile = cDir & sampName & "_FRED.txt" J4YT)-  
        Open outFile For Output As #1 SXQ@;= ]xV  
        Print #1, "type bsdf_data" {bT9VZ>  
        Print #1, "format angles=deg bsdf=value scale=1" X6Un;UL  
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        'Loop the file list, skip the two header lines and write the remaining data to file +C'XS{K,#  
        Dim lineArray() As String, curLine As Long `-4'/~G  
        For Each curFile In fList (jMtN?&0H-  
            Print "Merging data from file " & curFile DH:J  
            ReadFile( cDir & curFile, lineArray ) dw~[9oh  
            For curLine = 2 To UBound(lineArray)  ( :  
                Print #1, lineArray(curLine) haCKv   
            Next YnSbw3U.I  
        Next ar Q)%W  
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        'Close the output file '0Lov]L  
        Close #1 2R~6<W+&:>  
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        Print "Finished merging RPC data for sample " & sampName RoX &+~  
        Print "FRED formatted data file: " & Chr(9) & outFile (/&;jV2DD[  
    End Sub Hk@r5<{  
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    'Utility function to read the contents of a file into an array of strings. bMsECA&  
    Function ReadFile(ByVal fileName As String, _ {|z#70  
                      ByRef lineArray() As String) As Long )Nbc/nB$  
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        ReadFile = -1 {&-#s#&  
        Dim oFSO As Object fmFzW*,E  
        Set oFSO = CreateObject("Scripting.FileSystemObject") _lXt8}:+  
        Erase lineArray !x7o|l|cP  
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        Dim fid As Long |=O1Hn  
        If oFSO.fileexists( fileName ) Then JT04vm4  
            fid = FreeFile() RwW$O@0  
            Open fileName For Input As fid GzdRG^vN  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) wFvT0  
            Close fid fp{G|.SA  
        End If *<IR9.~{6%  
        Set oFSO = Nothing 4@6 <  
        Return UBound( lineArray ) ><=rIhG%H@  
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    End Function 3htq[Ren  
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    Sub GetFileList( ByVal in_dir As String, _ 'd/*BjNp)  
                     ByRef in_flist() As String ) @ .gPJMA  
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        'Redimension the file list array Q4?EZ_O  
        Erase in_flist d`Oe_<  
    !MoOKW  
        'Tracks how many files are found qBYg[K>  
        Dim fCount As Long (9]6bd  
        fCount = 0 *g_w I%l  
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        'Recurse directory and search for text files :H?f*aw  
        Dim f As String 'w.}2(  
        f = Dir$(in_dir & "*.txt") 2bLI%gg3  
        While f <> "" & fu z2xv  
            ReDim Preserve in_flist(fCount) 4&{!M _  
            in_flist(fCount) = f PO o%^'(  
            fCount += 1 E]1##6Ae  
            f = Dir$() 59 <hV?  
        Wend HTk\723Rdw  
        ReDim Preserve in_flist(fCount-1) 5/?P|T   
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    End Sub 'wvMH;}u  
     
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