公开(公告)号：US20100227541A1

公开(公告)日：2010-09-09

申请号：US12783826

申请日：2010-05-20

申请人： Dennis R. Dietz ,  John Robert Harrell ,  Dwight Ray Shackelford

发明人： Dennis R. Dietz ,  John Robert Harrell ,  Dwight Ray Shackelford

IPC分类号： F24F11/04 ,  F24F13/10

CPC分类号： F24F11/0001 ,  F24F11/75 ,  F24F2140/40 ,  G05D7/0688 ,  Y10T137/86944

摘要： A system and method for providing a substantially constant volume exhaust or ventilation air terminal system is shown for controlling exhaust and/or return airflow rates in a system having a central fan or ventilator. The system and method permits zone-by-zone or area-by-area airflow regulation or control in non-demand areas in response to a demand or call for ventilation in demand areas. In one embodiment, the system employs at least one constant airflow controller or regulator situated in a damper. Another embodiment shows a combination of a first constant airflow controller or regulator situated or mounted on a damper with a second constant airflow controller or regulator situated in a duct associated with the damper. In still another embodiment, a constant airflow controller or regulator is provided in a duct, and used in combination with a solid damper.

摘要翻译： 示出了用于提供基本恒定体积的排气或通风空气终端系统的系统和方法，用于在具有中央风扇或通风机的系统中控制排气和/或返回气流速率。 该系统和方法可以响应需求区域的需求或通风要求，在非需求区域允许逐区或逐区域气流调节或控制。 在一个实施例中，系统采用位于阻尼器中的至少一个恒定气流控制器或调节器。 另一个实施例示出了位于或安装在阻尼器上的第一恒定气流控制器或调节器与位于与阻尼器相关联的管道中的第二恒定气流控制器或调节器的组合。 在另一个实施例中，在管道中设置恒定的气流控制器或调节器，并与固体阻尼器组合使用。

公开(公告)号：US4537074A

公开(公告)日：1985-08-27

申请号：US530687

申请日：1983-09-12

申请人： Dennis R. Dietz

发明人： Dennis R. Dietz

IPC分类号： G01N29/26 ,  G10K11/32 ,  G01N29/00

CPC分类号： G10K11/32 ,  G01N29/262

摘要： An annular array ultrasonic transducer is provided which comprises a plurality of concentric rings of piezoelectric material having widths chosen for operation at different depths of focus. The total aperture of the transducer is divided into a plurality of contiguous focal depths. In the near field only the inner element or elements are activated, and rings of increasing radius are added as the depth of focus is increased. The widths of the rings are chosen to keep phase errors across each ring within acceptable limits over the depth of field for which they are energized. The transition depths at which the aperture is changed are chosen to allow rings of manufacturable widths to be employed while maintaining aperture transitions which prevent banding in the ultrasonic image.

摘要翻译： 提供了一种环形阵列超声换能器，其包括多个压电材料的同心环，其具有选择用于在不同深度的焦点处操作的宽度。 换能器的总孔径被分成多个连续的焦点深度。 在近场只有内部元件被激活，并且当焦点深度增加时，增加半径的环被添加。 选择环的宽度以使每个环上的相位误差保持在它们被激励的景深的可接受限度内。 选择孔径改变的过渡深度以允许可制造宽度的环，同时保持防止超声波图像中的条纹的孔径转换。