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    • 78. 发明申请
    • Measurement of air characteristics in the lower atmosphere
    • 测量低层大气中的空气特性
    • US20040252586A1
    • 2004-12-16
    • US10784686
    • 2004-02-23
    • Andrew Louis Martin
    • G01S015/02
    • G01S15/885G01N29/02G01N29/2456G01N29/46G01N2291/012G01N2291/045G01N2291/103G01P5/24G01S15/104G01S15/582G01S15/87G01W2001/003
    • Sodar systems and methods for acoustically sounding air are disclosed in which chirps longer than 300 msnulland preferably with durations of tens of secondsnullare used along with matched filter and/or Fourier processing methods to derive phase signals indicative of air characteristics in range. A listen-while-transmit strategy is preferred, the direct signal being removed by subtracting the phase signals from two or more receivers located near the transmitter so as to be in the same noise environment. The resultant differential signals can be related to cross-range wind with range distance. In one example, apparatus (100) is employed comprising a reflector dish (102) over which one central loudspeaker (110) and four microphones (112, 114, 130 and 132) are mounted, the microphones preferably being located on cardinal compass points and having their axes (124, 126) slightly angled with respect to the vertical transmission axis (122).
    • 公开了用于声学探测空气的Sodar系统和方法,其中使用长于300ms的啁啾和优选地持续数十秒的啁啾以及匹配的滤波器和/或傅里叶处理方法来导出指示范围内的空气特性的相位信号。 听同时发送策略是优选的,通过从位于发射机附近的两个或更多个接收机减去相位信号以使其处于相同的噪声环境中,直接信号被去除。 得到的差分信号可以与距离范围的横跨风相关。 在一个示例中,采用装置(100),其中安装有一个中心扬声器(110)和四个麦克风(112,114,130和132)的反射器盘(102),麦克风优选地位于基数罗盘点上, 使它们的轴线(124,126)相对于垂直传动轴线(122)略微成角度。
    • 79. 发明授权
    • Nondestructive method for detecting structural anomalies in composites
    • 用于检测复合材料结构异常的非破坏性方法
    • US06799126B1
    • 2004-09-28
    • US10400646
    • 2003-03-28
    • Colin P. RatcliffeRoger M. Crane
    • Colin P. RatcliffeRoger M. Crane
    • G06F1900
    • G01N29/42G01N29/14G01N2291/0231G01N2291/103
    • A nondestructive inspection method for composite structures, including thick core structures, is disclosed that imparts a vibration force into the structure and analyzes the response over a range of frequencies to find possible damaged areas. The composite structure is struck to induce vibration at a series of test points and the response of the composite structure as a function of acceleration at each test point is measured. The structural anomalies in the composite structure occur at structural stiffness irregularities near anomalies and are detected with a Gapped Smoothing Method operating on the data and plotting a structural irregularity index as a function of frequency and position.
    • 公开了一种用于包括厚芯结构的复合结构的非破坏性检查方法,其将振动力施加到结构中并分析频率范围上的响应以找到可能的损坏区域。 复合结构被击中以在一系列测试点处引起振动,并且测量复合结构作为每个测试点处的加速度的函数的响应。 复合结构中的结构异常发生在异常附近的结构刚度不规则处,并且使用经过数据的间隙平滑方法检测,并绘制作为频率和位置的函数的结构不规则指数。