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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 rSYi<ku  
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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 $t/x;< .H  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 \8uIER5)  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 =H|6 GJ  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 C XHy.&Vt  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 Xo*DvD  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ,[A'tUl _  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 (os$B  
    例如下所示: 46k?b|Q  
    Sample name:  EDF-C1-56 N&[D>G]>v  
    Merging data from file EDF-C1-56 0-0.txt NuU9~gSQ  
    Finished merging RPC data for sample EDF-C1-56 boo }u  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Sc7U |s  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 oc^Br~ Th  
    a. 创建一个新的散射库 dZ _zg<  
    b. 散射模型命名 4hw@yTUo  
    c. 改变散射模型为“Tabulated BSDF”. [NFNzwUB  
    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 ) t&9A ]<n%,  
    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。 RQFI'@Ks  
    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 #Eb5:;  
    g. 点击OK Nl' )l"  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 jP~Z`y f  
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    脚本代码 jzK5-;b  
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    '#Language "WWB-COM" [le)P$#z  
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    Option Explicit uf&N[M  
    |X`/  
    Sub Main LOTP*Syjf  
    =~I-]4  
        'Cleanup ?<* -j4v  
        ClearOutputWindow() M3~K,$@  
    |+$%kJR=  
        Print "Merging RPC Photonics BSDF Data Files" w}{5#   
        SetTextColor(255,0,0) x 2QIPUlf  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." KLX/O1B  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." V)P&Zw  
        SetTextColor(0,0,0) ;sch>2&ZWU  
    Jxqh )l  
        'Current directory of this script (should be the same as the text files being merged) }$\M{# C~  
        Dim cDir As String xm6EKp:  
        cDir = MacroDir$ & "\" &P,^.'  
    .Gcy> Av  
        'Array which will be populated with the list of files to be merged pZyQY+O  
        Dim fList() As String, curFile As String _sy'.Fo  
        GetFileList( cDir, fList ) CU7F5@+  
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        Print "" R<x'l=,D(  
        Print "Files found for merging:" {s3z"OV  
        For Each curFile In fList [&*6_q"V  
            Print Chr(9) & curFile }Yv\0\~'W|  
        Next ~}ET?Q7t  
    >*$;  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. >h+349  
        Dim nameArray() As String, sampName As String B4XZko(  
        nameArray = Split(fList(0)," 0-0.txt") mQ}ny(K'  
        sampName  = nameArray(0) kw`WH)+F  
        Print "" kbPE "urR  
        Print "Sample name: " & Chr(9) & sampName U=8@@ yE  
    B-d(@7,1  
        'Open an output file and write the FRED header data RwVaZJe)l  
        Dim outFile As String VGqa)ri"  
        outFile = cDir & sampName & "_FRED.txt" yFhB>i  
        Open outFile For Output As #1 _owjTo}  
        Print #1, "type bsdf_data" `c+/q2M  
        Print #1, "format angles=deg bsdf=value scale=1" \(p{t  
    {RB-lfrWs  
        'Loop the file list, skip the two header lines and write the remaining data to file 7DlOW1|  
        Dim lineArray() As String, curLine As Long h3gWOU  
        For Each curFile In fList vKoP|z=m  
            Print "Merging data from file " & curFile =e?$M  
            ReadFile( cDir & curFile, lineArray ) TEsnNi 1  
            For curLine = 2 To UBound(lineArray) dC}`IR  
                Print #1, lineArray(curLine) !AJ]j|@VBd  
            Next  ,YhwpkL  
        Next UhmTr[&  
    wY"o`o Z  
        'Close the output file dGwszziuK  
        Close #1 @DC)]C2  
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        Print "Finished merging RPC data for sample " & sampName *V(Fn-6(  
        Print "FRED formatted data file: " & Chr(9) & outFile 6b~28  
    End Sub z<]bv7V  
    U/;]zdP.K  
    'Utility function to read the contents of a file into an array of strings. amQz^^  
    Function ReadFile(ByVal fileName As String, _ %i)B*9k  
                      ByRef lineArray() As String) As Long 2i|B=D(  
    9N[EZhW  
        ReadFile = -1 xv7"WFb  
        Dim oFSO As Object 2=ztKfsBhE  
        Set oFSO = CreateObject("Scripting.FileSystemObject") K t#,]]  
        Erase lineArray a <X0e>  
    -v?hqWMp#  
        Dim fid As Long [&Hkn5yq  
        If oFSO.fileexists( fileName ) Then z1,tJH0  
            fid = FreeFile() mCKk*5ws5"  
            Open fileName For Input As fid q6`G I6  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) }jF+`!*!  
            Close fid GJ 'spgz  
        End If xn}BB}s{t  
        Set oFSO = Nothing ep(g`e  
        Return UBound( lineArray ) VF0dE  
    !NKmx=I]  
    End Function pJ, @Y>  
    \Btk;ivg  
    Sub GetFileList( ByVal in_dir As String, _ !PUp>(  
                     ByRef in_flist() As String ) rn.\tDeA  
    p SN~DvR  
        'Redimension the file list array lu UYo  
        Erase in_flist y,+[$u7h  
    e<gx~N9l'  
        'Tracks how many files are found AH{^spD{7,  
        Dim fCount As Long 4}KU>9YRA  
        fCount = 0 |kiJ}oy  
    Gk~l,wV>  
        'Recurse directory and search for text files #WE]`zd  
        Dim f As String 6!EYrX}rI[  
        f = Dir$(in_dir & "*.txt") oUW<4l  
        While f <> "" INMP"1  
            ReDim Preserve in_flist(fCount)  [~Hg}-c  
            in_flist(fCount) = f gp|1?L 54  
            fCount += 1 B94 &elu  
            f = Dir$() qg,Nb  
        Wend @Z\2*1y6  
        ReDim Preserve in_flist(fCount-1) [EHrIn  
     ?)tK!'  
    End Sub e-D4'lu  
     
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