切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 925阅读
    • 0回复

    [技术]RPC Photonics扩散片BSDF [复制链接]

    上一主题 下一主题
    离线infotek
     
    发帖
    6421
    光币
    26250
    光券
    0
    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 bO2s'!x  
    S_ Pa .  
    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。
    /degBL+  
    IxQ(g#sj_k  
    背景 ':jsCeSB  
    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。 i^zncDMA  
    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。 @ZUrr_|  
    图1. RPC Photonics工程漫射体结构及光束投射形状
    8vL2<VT;  
    sWc_,[b  
    (+^z9p7/!  
    步骤 ;@R=CQ6  
    eumpNF%$  
    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。 {+V]saYP  
    i G%h-  
    图2. RPC Photonics工程漫射体不同类型的散射数据
    WFTXSHcG  
    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) -4 !9cE  
    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 8UahoNrSt  
    例如下所示: =K ctAR;  
    Sample name:  EDF-C1-56 l9eCsVQ~V  
    Merging data from file EDF-C1-56 0-0.txt c4'k-\JvT  
    Finished merging RPC data for sample EDF-C1-56 BlrZ<\-/  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt h/a|-V}m&  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 --}5%6  
    a. 创建一个新的散射库 s.p4+K J  
    b. 散射模型命名 n8dJ6"L<"  
    c. 改变散射模型为“Tabulated BSDF”. #2~-I  
    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 ) AsOkOS3  
    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。 -J<{NF  
    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 p]-\\o}  
    g. 点击OK ,sqx xq  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 vTdJe  
    $k|:V&6SV  
    % >\v6ea  
    脚本代码 c :{#H9  
    UbnX%2TW  
    '#Language "WWB-COM" Mt93YD-2+  
    G'M;]R9EP  
    Option Explicit TJY  [s-  
    ,R~{$QUl  
    Sub Main 8NJxtT~0c~  
    %]m/fo4b  
        'Cleanup XJ3p<  
        ClearOutputWindow() FZ0wtS2  
    ,L.*95 ,  
        Print "Merging RPC Photonics BSDF Data Files" `v|w&ty*  
        SetTextColor(255,0,0) N-9Vx#i  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 3;hztCZj  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." nN]GO}  
        SetTextColor(0,0,0)  4.7 PL  
    pr) `7VuKp  
        'Current directory of this script (should be the same as the text files being merged) :Q=tGj\ G  
        Dim cDir As String UCz\SZ{za  
        cDir = MacroDir$ & "\" a At<36{?  
    K|{IX^3)V  
        'Array which will be populated with the list of files to be merged qq,#bRe  
        Dim fList() As String, curFile As String *:+&Sx L  
        GetFileList( cDir, fList ) %tOGs80_{  
    dx&!RK+  
        Print "" D["~G v  
        Print "Files found for merging:" RI[=N:C^  
        For Each curFile In fList .T63:  
            Print Chr(9) & curFile aJ{-m@/ 5  
        Next .yF@Ow  
    0'3f^Ajf  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. /Z?$!u4I  
        Dim nameArray() As String, sampName As String sYG:\>}ie  
        nameArray = Split(fList(0)," 0-0.txt") L/Ytkag  
        sampName  = nameArray(0) wOLDHg_  
        Print "" 0'QX*xfa>  
        Print "Sample name: " & Chr(9) & sampName GI[TD?s  
    T@4R|P&{)  
        'Open an output file and write the FRED header data (\8~W*ej"  
        Dim outFile As String A5\00O~  
        outFile = cDir & sampName & "_FRED.txt" 4!</JZX~$  
        Open outFile For Output As #1 :Rftn6!  
        Print #1, "type bsdf_data" cS2PrsUx  
        Print #1, "format angles=deg bsdf=value scale=1" nr{#Krkb  
    i!a. 6Gq  
        'Loop the file list, skip the two header lines and write the remaining data to file )-s9CWJv  
        Dim lineArray() As String, curLine As Long   L* 0$x  
        For Each curFile In fList `B A'a" $  
            Print "Merging data from file " & curFile u^4$<fd  
            ReadFile( cDir & curFile, lineArray ) &}y?Lt  
            For curLine = 2 To UBound(lineArray) X3dXRDB'  
                Print #1, lineArray(curLine) 1o8C4?T&  
            Next #lY_XV.  
        Next 3T= ?!|e  
    f'oO/0lx  
        'Close the output file Ct<]('Hm(  
        Close #1 B4Fuvi  
    (6crWw{3  
        Print "Finished merging RPC data for sample " & sampName WR<?_X_  
        Print "FRED formatted data file: " & Chr(9) & outFile -\9K'8 C  
    End Sub +7KRoF|  
    `w_%HVw>"  
    'Utility function to read the contents of a file into an array of strings. A/c#2  
    Function ReadFile(ByVal fileName As String, _ E~y( @72)  
                      ByRef lineArray() As String) As Long L[cP2X]NQ  
    _yRD*2 !;  
        ReadFile = -1 \:m1{+l  
        Dim oFSO As Object {6tj$&\)  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 'nT#c[x[0  
        Erase lineArray {zTnE?(o`  
    T! ww3d  
        Dim fid As Long xjy(f~'  
        If oFSO.fileexists( fileName ) Then rk-GQ#SKU  
            fid = FreeFile() sW,JnR  
            Open fileName For Input As fid W>j@E|m$  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) sx n{uRF  
            Close fid #I"s{*  
        End If -hY@r 7y  
        Set oFSO = Nothing `oU|U!|  
        Return UBound( lineArray ) 5~[m]   
    SaIY-PC  
    End Function |JLXgwML  
    q|g>;_  
    Sub GetFileList( ByVal in_dir As String, _ x^7 9s_h5  
                     ByRef in_flist() As String ) {[)n<.n[g  
    dSI<s^n  
        'Redimension the file list array ;O7Vl5R  
        Erase in_flist eBWgAf.k  
    ]Zz.n5c  
        'Tracks how many files are found ,rS?^"h9  
        Dim fCount As Long :2.<JUDM  
        fCount = 0 E 1`TQA  
    b+CJRB1  
        'Recurse directory and search for text files v&qL r+_7  
        Dim f As String  :Y Ki  
        f = Dir$(in_dir & "*.txt") S J2l6  
        While f <> "" $Jo4n>/  
            ReDim Preserve in_flist(fCount)  tE#;$Ss  
            in_flist(fCount) = f kMx)G]  
            fCount += 1 3yrb7Rn3  
            f = Dir$() aka)#0l .  
        Wend P~M[i9 V  
        ReDim Preserve in_flist(fCount-1) f_2(`T#  
    `&9iC 4P  
    End Sub v5\5:b {/  
     
    分享到