公开(公告)号：US06178820B2

公开(公告)日：2001-01-30

申请号：US09308323

申请日：1999-06-08

Applicant: Kari Kirjavainen ,  Jukka Lekkala ,  Hannu Nyk{umlaut over (a)}nen ,  Seppo Uosukainen

Inventor： Kari Kirjavainen ,  Jukka Lekkala ,  Hannu Nyk{umlaut over (a)}nen ,  Seppo Uosukainen

IPC: G01H1108

CPC classification number: G01P15/125 ,  G01H11/06

Abstract: The invention relates to a sensor for measuring acceleration and sound pressure, the sensor comprising a first pressure sensitive film (2) for measuring pressure (P) and second pressure sensitive film (5) having a mass (6) disposed thereon for measuring acceleration (A). The films are arranged concentrically in the same plane, so that pressure and acceleration are measured at the same point, thereby avoiding a phase difference between the two measurements.

Abstract translation: 本发明涉及一种用于测量加速度和声压的传感器，该传感器包括用于测量压力（P）的第一压敏膜（2）和其上设置有用于测量加速度的质量（6）的第二压敏膜（5） 一个）。 膜同心地设置在同一平面上，从而在同一点测量压力和加速度，从而避免两次测量之间的相位差。

公开(公告)号：US06847722B1

公开(公告)日：2005-01-25

申请号：US09508404

申请日：1998-09-09

Applicant: Seppo Uosukainen ,  Vesa Välimäki ,  Kari Kirjavainen ,  Jukka Lekkala ,  Hannu Nykänen

Inventor： Seppo Uosukainen ,  Vesa Välimäki ,  Kari Kirjavainen ,  Jukka Lekkala ,  Hannu Nykänen

IPC: G10K11/178 ,  A61F11/06 ,  G10K11/06 ,  H03B29/00

CPC classification number: G10K11/178 ,  G10K2210/112 ,  G10K2210/3027 ,  G10K2210/3212

Abstract: The invention relates to a method and an equipment for attenuating sound in a duct. Sound propagating in a duct is detected by means of a detector (2) and attenuated by using two successive monopole elements (3, 4) in such a way that both elements function as a dipole approximation and the elements are also used to approximatively produce the monopole radiation needed. A dipole control signal is fed to both elements (3, 4) at a phase shift which is 180° between the two elements. In addition, a monopole control signal is fed to the same elements (3, 4), only this time cophasally. Total volume velocities produced by the two elements (3, 4) are combinations of the portions obtained from the monopole and dipole sources.

Abstract translation: 本发明涉及一种用于衰减管道中的声音的方法和设备。 通过检测器（2）检测在管道中传播的声音，并且通过使用两个连续的单极子元件（3,4）衰减，使得两个元件都用作偶极近似，并且元件也用于近似地产生 需要单极辐射。 偶极控制信号以两个元件之间的180°的相移被馈送到两个元件（3,4）。 此外，单极控制信号被馈送到相同的元件（3,4），这仅仅是这个时间。 由两个元件（3,4）产生的总体积速度是从单极子和偶极子源获得的部分的组合。