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    • 4. 发明申请
    • Five degree of freedom intertial measurement device
    • 五自由度测量装置
    • US20060185432A1
    • 2006-08-24
    • US11331596
    • 2006-01-13
    • Harvey Weinberg
    • Harvey Weinberg
    • G01P3/04
    • G01P3/44G01C21/16G01P7/00G01P15/0888G01P15/18
    • A five degree of freedom inertial measurement unit capable of measuring: linear acceleration of a body along a first axis, a second axis, and a third axis; angular acceleration of the body about the second axis; and angular acceleration of the body about the third axis. The first axis, the second axis, and third axis are substantially mutually orthogonal and intersect at an origin point. The unit includes first and second accelerometers that are in fixed positions relative to the body. The first accelerometer measures linear acceleration along both the second axis and the third axis. The second accelerometer measures linear acceleration along both the second axis and third axis. The first and second accelerometers are positioned on a plane defined by the first axis and the second axis. A controller is operatively coupled to the first accelerometer and the second accelerometer. The controller determines the angular acceleration of the body about the second axis, and the angular acceleration of the body about the third axis. The controller determines angular acceleration using no other acceleration signals other than the linear acceleration signals from the first and second accelerometers.
    • 5自由度惯性测量单元,其能够测量:主体沿着第一轴线,第二轴线和第三轴线的线性加速度; 身体绕第二轴的角加速度; 和身体围绕第三轴的角加速度。 第一轴线,第二轴线和第三轴线基本上相互正交并且在原点相交。 该单元包括相对于身体处于固定位置的第一和第二加速度计。 第一加速度计测量沿着第二轴线和第三轴线的线性加速度。 第二加速度计测量沿着第二轴和第三轴线的线性加速度。 第一和第二加速度计位于由第一轴和第二轴限定的平面上。 控制器可操作地耦合到第一加速度计和第二加速度计。 控制器确定主体围绕第二轴的角加速度,以及主体围绕第三轴的角加速度。 除了来自第一和第二加速度计的线性加速度信号之外,控制器不使用除其它加速度信号之外的角加速度。
    • 10. 发明授权
    • Ultrasound air velocity detector for HVAC ducts and method therefor
    • US5583301A
    • 1996-12-10
    • US336835
    • 1994-11-09
    • Jason StraussHarvey WeinbergZev Kopel
    • Jason StraussHarvey WeinbergZev Kopel
    • G01F1/66G01P5/24
    • G01P5/248G01F1/662G01F1/667
    • The air velocity detector is used in combination with an air duct carrying heat, ventilation or air conditioned (HVAC) air therethrough. A rigid support subassembly is mounted in the HVAC air duct. At least a pair of ultrasonic transceivers are mounted in a spaced apart relationship facing each other on opposing end portions of the support subassembly. The acoustic, ultrasonic signal path from one transceiver to the other diagonally extends across a volume of duct covered by the rigid support subassembly. In one embodiment, the subassembly is a rigid sleeve mounted to the inboard, interior portions of the duct. In another embodiment, the subassembly is a rigid, substantially straight member diagonally extending through the duct volume. Electronic circuitry is connected to the transceivers which excites the transceivers, processes the received ultrasonic signal, and determines the phase difference or phase difference between the transmitted ultrasonic signal and the received ultrasonic signal. This phase difference representative signal is then used to calculate the velocity of the air. In one embodiment, additional temperature signals are obtained in order to determine the velocity of the air. In another embodiment, ultrasonic signals are first sent in one direction (from a first ultrasonic transceiver to a second ultrasonic transceiver) and then sent from the opposite end (from the second transceiver to the first transceiver). The resultant phase difference representative signals detected during each uni-directional transmission are subtracted from the other. The resultant signal is utilized to obtain the air velocity. In another embodiment, the system is calibrated when no air is flowing through the HVAC duct. The "still air" time or phase difference signal is utilized as a reference signal to compute air velocity during normal HVAC operations. A method of detecting air velocity in the HVAC duct is also disclosed.