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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 ^!x qOp!  
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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 Sp]ov:]%f  
    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。 7mL1$i6=  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 S KGnx  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 P@Vs\wAT  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 AOx8OiqE:  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) &?k`rF9  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 6` 3kNk;  
    例如下所示: `!ZkWF6  
    Sample name:  EDF-C1-56 b(> G  
    Merging data from file EDF-C1-56 0-0.txt  nWUau:%  
    Finished merging RPC data for sample EDF-C1-56 }MtORqK  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt #*3 vE& p  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 +y][s{A  
    a. 创建一个新的散射库 %m$t'?  
    b. 散射模型命名 /K_*Drk>  
    c. 改变散射模型为“Tabulated BSDF”. ;XXEvRk  
    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 ) Vc+~yh.)  
    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&Sr+D aPD  
    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 B0^:nYko  
    g. 点击OK ~O 4@b/!4  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 TBgiA}|\D  
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    脚本代码 ~}Z{hs)  
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    '#Language "WWB-COM" ][~rk?YY  
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    Option Explicit !X=93%  
    SA [(1dy;  
    Sub Main ;9qwB  
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        'Cleanup ryTtGx%a  
        ClearOutputWindow() {3 >`k.w  
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        Print "Merging RPC Photonics BSDF Data Files" %@%~<U)W  
        SetTextColor(255,0,0) ca%XA|_J  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." o^u}(wZ{  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." c32"$g  
        SetTextColor(0,0,0) M$3/jl*#}  
    )F6p+i="  
        'Current directory of this script (should be the same as the text files being merged) (dym*_J  
        Dim cDir As String zZV9`cqZ{  
        cDir = MacroDir$ & "\" XL(2Qk  
    S4{\5ulr7  
        'Array which will be populated with the list of files to be merged zZS,<Z  
        Dim fList() As String, curFile As String <p[RhP  
        GetFileList( cDir, fList ) @! jpJ}  
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        Print "" +sXnC\  
        Print "Files found for merging:" B:)vPO+ d  
        For Each curFile In fList z{qn|#}  
            Print Chr(9) & curFile %i&\ X[  
        Next MA v-#  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Qq\hD@Z|  
        Dim nameArray() As String, sampName As String Rz33_ qA  
        nameArray = Split(fList(0)," 0-0.txt") ~bfjP2 g  
        sampName  = nameArray(0) kqLpt  
        Print "" 9A}nZ1Y  
        Print "Sample name: " & Chr(9) & sampName 5 ~"m$/yE  
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        'Open an output file and write the FRED header data G)%r|meKGB  
        Dim outFile As String $oZV 54  
        outFile = cDir & sampName & "_FRED.txt" i.+#a2   
        Open outFile For Output As #1 T7*p! 0  
        Print #1, "type bsdf_data" Ft8ii|-  
        Print #1, "format angles=deg bsdf=value scale=1" dj3E20Ws  
    2X=*;r"{J  
        'Loop the file list, skip the two header lines and write the remaining data to file m_UzmWF  
        Dim lineArray() As String, curLine As Long 5I5#LQv0  
        For Each curFile In fList -yY]0  
            Print "Merging data from file " & curFile ))uki*UNK  
            ReadFile( cDir & curFile, lineArray ) 1i 6>~  
            For curLine = 2 To UBound(lineArray) Mey=%Fv  
                Print #1, lineArray(curLine) <:~'s]`zf  
            Next @FuX^Q.[  
        Next |exjrsmM*  
    BR0P :h  
        'Close the output file - [7S.  
        Close #1 ]ov"&,J  
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        Print "Finished merging RPC data for sample " & sampName "C]_pWk  
        Print "FRED formatted data file: " & Chr(9) & outFile S&~;l/  
    End Sub *l'5z)]  
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    'Utility function to read the contents of a file into an array of strings. |A:+[35  
    Function ReadFile(ByVal fileName As String, _ m[&pR2T  
                      ByRef lineArray() As String) As Long N#vV;  
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        ReadFile = -1 MT.D#jv&  
        Dim oFSO As Object /Y*6mQ:  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Ga $EM  
        Erase lineArray %<'PSri  
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        Dim fid As Long MJ`BlE,Fmb  
        If oFSO.fileexists( fileName ) Then 1.q a//'RW  
            fid = FreeFile() ~H`(zzk  
            Open fileName For Input As fid I#](mRJ6  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) +q)B4A'J!  
            Close fid _,E! <  
        End If bOdyrynh  
        Set oFSO = Nothing O`='8'6zW\  
        Return UBound( lineArray ) #jX%nqMxW  
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    End Function *Duxabo?  
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    Sub GetFileList( ByVal in_dir As String, _ nV?e(}D  
                     ByRef in_flist() As String ) "?Xb$V7  
    2ee((vO&  
        'Redimension the file list array ScTeh  
        Erase in_flist mX QVL.P\  
    -hpMd/F  
        'Tracks how many files are found <Z9N}wY,8  
        Dim fCount As Long (Qz| N  
        fCount = 0 I=wA)Bli1p  
    ? Eh)JJt  
        'Recurse directory and search for text files "(SZ;y  
        Dim f As String ~JxAo\2i  
        f = Dir$(in_dir & "*.txt") rTLo6wI  
        While f <> "" ~0XV[$`L  
            ReDim Preserve in_flist(fCount) FR1se  
            in_flist(fCount) = f agxR V  
            fCount += 1 Rac4a@hZ  
            f = Dir$() 9_\1cSk'  
        Wend ttC+`0+H  
        ReDim Preserve in_flist(fCount-1) =;@?bTmqD  
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    End Sub d"JI4)%  
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