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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 swntz  
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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 DBI[OG9  
    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。 PMebn$(  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 a$y=+4L  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 nlQ<Aa-%  
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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。 q$(@  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) T0J"Wr>WY  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 u=JI 1  
    例如下所示: M^JRHpTn  
    Sample name:  EDF-C1-56 HS =qK  
    Merging data from file EDF-C1-56 0-0.txt fgVeB;k|  
    Finished merging RPC data for sample EDF-C1-56  c %w h  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt (vMC.y5  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 @-|{qP=Dy  
    a. 创建一个新的散射库 #Cks&[!c  
    b. 散射模型命名 B#9rqC  
    c. 改变散射模型为“Tabulated BSDF”. 2 UU5\ jV6  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 5-3`@ (/  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ^|M\vO  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 1bs 8fUPB3  
    g. 点击OK ~$-Nl  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 20h|e+3  
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    脚本代码 u4*7 n-(  
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    '#Language "WWB-COM" ?9 hw]Q6r}  
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    Option Explicit m`l3@ Z  
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    Sub Main WD c2Qt  
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        'Cleanup VDq4n;p1  
        ClearOutputWindow() 6UOV,`:m+  
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        Print "Merging RPC Photonics BSDF Data Files" 3)ac  
        SetTextColor(255,0,0) 3#o!K  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 1sKKmtgH  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." V~ph1Boz2  
        SetTextColor(0,0,0) HO%atE$>  
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        'Current directory of this script (should be the same as the text files being merged) x-O9|%aRJ  
        Dim cDir As String \W$bOp  
        cDir = MacroDir$ & "\" |_ZD[v S  
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        'Array which will be populated with the list of files to be merged fZ!fwg$  
        Dim fList() As String, curFile As String v3SH+Ej4  
        GetFileList( cDir, fList ) !pY=\vK;  
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        Print "" qd\5S*Z1  
        Print "Files found for merging:" ip6$Z3[)  
        For Each curFile In fList C;7?TZ&xw  
            Print Chr(9) & curFile DtkY;Yl  
        Next ;O` \rP5w  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. m:|jv|f  
        Dim nameArray() As String, sampName As String YYfX@`\  
        nameArray = Split(fList(0)," 0-0.txt") *opf~B_e  
        sampName  = nameArray(0) vpR^G`/  
        Print "" ` QC  
        Print "Sample name: " & Chr(9) & sampName 5y]1v  
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        'Open an output file and write the FRED header data %Ci`O hT  
        Dim outFile As String '6U~|d  
        outFile = cDir & sampName & "_FRED.txt" <-KHy`u  
        Open outFile For Output As #1 pm$ZKM  
        Print #1, "type bsdf_data" )wkh  
        Print #1, "format angles=deg bsdf=value scale=1" bH+x `]{A  
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        'Loop the file list, skip the two header lines and write the remaining data to file jM`)N d  
        Dim lineArray() As String, curLine As Long ($a ?zJr  
        For Each curFile In fList Pp-\#WJ  
            Print "Merging data from file " & curFile ~<b/%l>h1  
            ReadFile( cDir & curFile, lineArray ) ~&-8lD];LM  
            For curLine = 2 To UBound(lineArray) g$C-G5/bjD  
                Print #1, lineArray(curLine) 5)X;q-  
            Next Bx R% \  
        Next  z.fh4p  
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        'Close the output file 2uonT,W  
        Close #1 =@%;6`AVcp  
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        Print "Finished merging RPC data for sample " & sampName s|iph~W!L  
        Print "FRED formatted data file: " & Chr(9) & outFile V=yRE  
    End Sub JNhHQvi\  
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    'Utility function to read the contents of a file into an array of strings. +Kc1a;  
    Function ReadFile(ByVal fileName As String, _ Wn;B~  
                      ByRef lineArray() As String) As Long c2M-/ x-:  
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        ReadFile = -1 @\-i3EhR  
        Dim oFSO As Object 3V")~ m  
        Set oFSO = CreateObject("Scripting.FileSystemObject") GA&mM   
        Erase lineArray ]3.Un,F  
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        Dim fid As Long 97"dOi!Wh  
        If oFSO.fileexists( fileName ) Then  LW?Zd=  
            fid = FreeFile() 2+KOUd&jS  
            Open fileName For Input As fid u`E24~  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ~ou1{NS  
            Close fid ^/;W;C{4  
        End If cd8ZZ 8L  
        Set oFSO = Nothing JTT"t@__  
        Return UBound( lineArray ) cSdkhRAn  
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    End Function +rEqE/QF  
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    Sub GetFileList( ByVal in_dir As String, _ {"<6'2T3  
                     ByRef in_flist() As String ) 3Cq/ o'  
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        'Redimension the file list array cY/!z  
        Erase in_flist EJqzh i5  
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        'Tracks how many files are found u Qy5t:!  
        Dim fCount As Long oicett=5  
        fCount = 0 {0(:7IY,  
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        'Recurse directory and search for text files u3{gX{so  
        Dim f As String .H1 kl)~V  
        f = Dir$(in_dir & "*.txt") BoZ G^  
        While f <> "" "BB#[@  
            ReDim Preserve in_flist(fCount)  ESOuDD2<  
            in_flist(fCount) = f F|._'i+B!  
            fCount += 1 !\{&^,y  
            f = Dir$() bDdJh}Vz  
        Wend `Pj7O/!)#!  
        ReDim Preserve in_flist(fCount-1) qw A N=3@  
    ; n2|pC^  
    End Sub D;bQ"P-m47  
     
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