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    • 3. 发明授权
    • Ultrasonic doppler flow meter
    • 超声波多普勒流量计
    • US4905206A
    • 1990-02-27
    • US369656
    • 1989-06-20
    • Hisashi NishiyamaKageyoshi KatakuraToshio OgawaSatoshi TamanoKoji TanabeShizuo Ishikawa
    • Hisashi NishiyamaKageyoshi KatakuraToshio OgawaSatoshi TamanoKoji TanabeShizuo Ishikawa
    • G01F1/66G01S15/58
    • G01F1/663G01S15/582G01S15/584
    • A flow meter, in which pulsed continuous ultrasonic wave is transmitted towards an object at predetermined intervals T to obtain a phase vector from a reception signal of wave reflected by the object and which calculates a Doppler frequency from the average value of phase differences between phase vectors at the sampling interval T to obtain a signal indicating the speed of the object, comprising a phase difference calculator by the auto-correlation method, by which a plurality of phase difference vectors indicating phase differences between phase vectors are added, the argument of the sum vector thus obtained representing the average phase difference, or a phase difference calculator by the 2-axial-component method, by which a phase difference is divided into 2 axial components, a cosine value and a sine value, and the average phase difference is obtained by using the average value for each of the components, and a phase difference calculator by the phase difference averaging calculator, by which a plurality of phase differences are added, as they are, to obtain the average thereof, in order to obtain a phase difference average value having small errors by switching them.
    • 一种流量计,其中脉冲连续超声波以预定间隔T朝向物体传输,以从由物体反射的波的接收信号中获得相位矢量,并根据相位矢量之间的相位差的平均值计算多普勒频率 以采样间隔T,以获得指示对象速度的信号,包括通过自相关方法的相位差计算器,通过该相关方法将表示相位矢量之间的相位差的多个相位差矢量相加, 或通过2-轴分量法的相位差计算器,将相位差分成2个轴向分量,余弦值和正弦值,得到平均相位差 通过使用每个分量的平均值,以及通过相位差平均计算的相位差计算器 或者通过其相加多个相位差来获得其平均值,以便通过切换来获得具有较小误差的相位差平均值。
    • 4. 发明授权
    • Ultrasonic Doppler flow meter
    • 超声多普勒流量计
    • US5111825A
    • 1992-05-12
    • US609657
    • 1990-11-06
    • Hisashi NishiyamaToshio OgawaKageyoshi Katakura
    • Hisashi NishiyamaToshio OgawaKageyoshi Katakura
    • G01P5/00A61B8/06G01F1/66G01S15/58
    • G01S15/582A61B8/06G01S15/584
    • A flow meter for detecting a flow speed in such a manner that an ultrasonic pulsed continuous wave is repeatedly transmitted toward an object at predetermined intervals T, a phase vector indicative of the phase of a reception signal due to the reflected wave is produced at the predetermined intervals, the phase difference between the present phase vector and the preceding phase vector is detected, and a Doppler frequency is calculated from the average value of a plurality of phase difference values to obtain the speed of the object. The phase difference values are classified into a first group consisting of position phase difference values and a second group consisting of negative phase difference values, the cosine and sine values of the central angle of the positive phase difference values and the cosine and sine values of the central angle of the negative phase difference values are calculated, and the argument of a vector indicated by the weighted sum of cosine values and the weighted sum of sine values is calculated to be used as an average phase angle.
    • 一种用于以这样的方式检测流速的流量计,即超声波脉冲连续波以预定间隔T被重复地传送到物体,产生指示由于反射波引起的接收信号的相位的相位矢量, 检测当前相位矢量和前一相位矢量之间的相位差,并根据多个相位差值的平均值计算多普勒频率,以获得对象的速度。 相位差值被分为由位置相位差值组成的第一组和由负相位差值组成的第二组,正相位差的中心角的余弦和正弦值以及正相位差的余弦和正弦值 计算负相位差值的中心角,并且计算由余弦值的加权和指示的矢量的自变量和正弦值的加权和,以用作平均相位角。
    • 8. 发明授权
    • Pulse doppler measuring apparatus
    • 脉冲多普勒测量仪
    • US5109858A
    • 1992-05-05
    • US650421
    • 1991-02-04
    • Hisashi NishiyamaYasuhiro HashimotoHiroshi KandaKageyoshi Katakura
    • Hisashi NishiyamaYasuhiro HashimotoHiroshi KandaKageyoshi Katakura
    • G01P5/00A61B8/06G01S15/52G01S15/58
    • G01S15/52G01S15/582G01S15/584
    • The present invention relates to a pulse Doppler measuring apparatus using the so-called acceleration method. In order to prevent production of a secondary aliasing (where a phase vector is subjected to an aliasing), the apparatus is provided with an MTI filter, which decomposes a first phase vector of a reflected wave obtained by mixing a reflection signal with a reference signal into a real part and an imaginary part, obtains a first regression line for variations of each of the parts and extracts a second phase vector corresponding only to the high frequency component of the reflected wave by calculating differences of the real part and the imaginary part from the first regression line; and/or an angular component .DELTA..theta. of the phase difference vector is obtained; a second regression line is obtained for this phase difference angle .DELTA..theta.; and the phase difference angle .DELTA..theta. is corrected by using this second regression line, to prevent the production of a secondary aliasing.
    • 本发明涉及使用所谓的加速法的脉冲多普勒测量装置。 为了防止产生二次混叠(其中相位矢量经历混叠),该装置设置有MTI滤波器,其分解通过将反射信号与参考信号混合而获得的反射波的第一相位矢量 获得用于各部分的变化的第一回归线,并且通过计算实部和虚部的差异来提取仅对应于反射波的高频分量的第二相位矢量 第一回归线 和/或相位差矢量的角分量DELTAθ; 对于该相位差角度ΔTATA获得第二回归线; 并且通过使用该第二回归线来校正相位差角度ΔTATA,以防止二次混叠的产生。
    • 9. 发明授权
    • Ultrasonic doppler flow meter
    • 超声波多普勒流量计
    • US5107466A
    • 1992-04-21
    • US611541
    • 1990-11-13
    • Hisashi NishiyamaToshio OgawaKageyoshi Katakura
    • Hisashi NishiyamaToshio OgawaKageyoshi Katakura
    • G01P5/00A61B8/06G01F1/66G01P5/24G01S15/58
    • G01F1/663G01P5/244G01S15/582G01S15/584
    • A flow meter for detecting the average speed of an object in such a manner that an ultrasonic pulsed continuous wave is repeatedly transmitted toward the object to obtain a phase vector from the reception signal of the wave reflected from the object, the phase difference between consecutive ones of phase vectors obtained at an interval T equal to the period of transmitted wave is detected, a plurality of phase difference values are added and averaged to obtain an average phase difference value, and a Doppler frequency is calculated from the average phase difference value to obtain the average speed of the object, in which in order to remove an error caused by aliasing of an angle in the course of the arithmetic operation for obtaining the average phase difference value, a plurality of presumed average phase difference values having the error are calculated from the average phase difference value, the difference between the change of a phase caused by adding the phase difference values successively and the change of phase based upon each of the presumed average phase difference values is estimated to select the most appropriate one of the presumed average phase difference values, and the selected average phase difference value is used as a corrected average phase difference value.
    • 一种用于检测物体的平均速度的流量计,使得超声波脉冲连续波从物体反射的反射的接收信号中朝向物体反复传送,得到相位矢量,连续的相位差之间的相位差 检测以等于发送波周期的间隔T获得的相位矢量,将多个相位差相加并平均以获得平均相位差值,并根据平均相位差值计算多普勒频率,以获得 为了消除在用于获得平均相位差值的算术运算过程中由角度的混叠引起的误差,物体的平均速度,具有误差的多个推定平均相位差值由 平均相位差值,通过相加差相加引起的相位变化之间的差异 估计基于每个推定的平均相位差值的相位变化,以选择假定的平均相位差值中最合适的一个,并且将所选择的平均相位差值用作校正的平均相位差值。
    • 10. 发明授权
    • Pulse doppler flow speed meter
    • 脉冲多普勒流量计
    • US4995397A
    • 1991-02-26
    • US413060
    • 1989-09-27
    • Hisashi NishiyamaKageyoshi KatakuraToshio Ogawa
    • Hisashi NishiyamaKageyoshi KatakuraToshio Ogawa
    • G01P5/24G01S15/52G01S15/58
    • G01P5/244G01S15/52G01S15/582G01S15/584
    • In a pulse Doppler flow speed meter in which ultrasonic wave pulses are transmitted repetitively at transmission intervals T and thereafter transmitted repetitively at transmission intervals (T+Ts), phases of reflected waves due to reflection of individual transmission pulses are measured sequentially to provide phase signals and the phase signals are subjected to frequency analysis to determine speed distributions, distributions of phase differences between phase signals corresponding to transmission pulses transmitted at the transmission intervals T and distributions of phase differences between phase signals corresponding to transmission pulses transmitted at the transmission intervals (T+Ts) are determined. A value of center of gravity of the former phase difference distributions and a value of center of gravity of the latter phase difference distributions are determined and then a phase difference between the two values of center of gravity is determined. Obtained from the phase difference are values of Doppler shift angle, according to which the former and latter phase difference distributions are shifted so as to be compensated for their aliasing.
    • 在脉冲多普勒流速计中,以传输间隔T重复地发送超声波脉冲,然后以传输间隔(T + Ts)重复地发射,顺序地测量由各个传输脉冲的反射引起的反射波相位,以提供相位信号 并对相位信号进行频率分析,以确定速度分布,对应于在传输间隔T发送的传输脉冲的相位信号之间的相位差的分布,以及对应于以传输间隔(T)发送的传输脉冲的相位信号之间的相位差的分布 + Ts)。 确定前一相位差分布的重心值和后一相位差分布的重心值,然后确定两个重心值之间的相位差。 从相位差中获得的是多普勒频移角的值,根据该值,前者和后面的相位差分布被移位以便对其混叠进行补偿。