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    • 6. 发明授权
    • Apparatus and method utilizing signal modulation detection for analyzing
the internal pressure of containers
    • 用于分析容器内部压力的信号调制检测装置和方法
    • US5861548A
    • 1999-01-19
    • US71787
    • 1998-05-01
    • Robert G. Melvin, IIRobert J. Ryan
    • Robert G. Melvin, IIRobert J. Ryan
    • G01L11/04G01M3/24G01N29/06G01N29/12G01N29/34G01N29/42G01M3/00G01L9/10G01N29/04
    • G01N29/42G01L11/04G01M3/24G01N29/0609G01N29/12G01N29/346G01N29/348G01N2291/014G01N2291/015G01N2291/02872G01N2291/2695
    • A method for analyzing the internal pressure of a closed container includes inducing vibration in a surface of the container; detecting sound resulting from the vibration; deriving information representing the detecting sound; and determining whether this information corresponds to a predetermined spectral frequency condition and a predetermined spectral amplitude condition. To ensure that the test results are not affected by modulating distortion which may be present in the information, the information is tested for the presence of a modulating distortion, and if so processed to compensate for the effects of this modulating distortion, prior to being tested against the predetermined spectral conditions. Alternatively or in addition, one or both of the upper and lower amplitude limits which define the spectral amplitude condition may be reset periodically to allow for slow changes in manufacturing conditions by accumulating amplitude data from a plurality of containers judged to have an acceptable internal pressure, analyzing this amplitude data to derive an average value and a deviation therefrom, and resetting one or both of the amplitude limits in dependence upon the derived average value and deviation.
    • 用于分析密闭容器的内部压力的方法包括在容器的表面中引起振动; 检测振动产生的声音; 导出表示检测声音的信息; 以及确定该信息是否对应于预定的频谱频率条件和预定的频谱幅度条件。 为了确保测试结果不受信号中可能存在的调制失真的影响,测试信息是否存在调制失真,如果这样进行处理以补偿此调制失真的影响,则在测试之前 抵抗预定的光谱条件。 或者或另外,定义频谱幅度条件的上限和下限幅度之一或两者可以周期性复位,以允许通过累积来自被判定为具有可接受的内部压力的多个容器的振幅数据来制造条件的缓慢变化, 分析该振幅数据以导出平均值及其偏差,并且根据导出的平均值和偏差来重置振幅极限中的一个或两个。