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    • 2. 发明申请
    • DISTANCE MEASUREMENT METHOD AND APPARATUS
    • 距离测量方法和设备
    • WO2009136149A1
    • 2009-11-12
    • PCT/GB2009/001120
    • 2009-05-06
    • RUDD, WayneLINNETT, Laurie
    • RUDD, WayneLINNETT, Laurie
    • G01S13/10G01S13/36G01S15/10G01S15/36
    • G01S13/106G01S13/36G01S15/107G01S15/36
    • There is provided a method and associated apparatus for measurement. Specifically, a method for determining a distance travelled by a signal in a medium, or the time of flight of a signal travelled. The method comprises considering an unambiguous range wherein the unambiguous range greater than a distance to be travelled by a signal. A signal is then transmitted across the distance to be determined, the signal comprising at least two frequency components, the frequency components based on the unambiguous range and the speed of the signal in the medium. The distance travelled (or the time of flight) is determined by using the variance of the received phase characteristics, such as phase angle) of one frequency component of the received signal with the received phase characteristics of another frequency component of the received signal.
    • 提供了一种用于测量的方法和相关联的装置。 具体地说,一种确定由介质中的信号行进的距离或行进的信号的飞行时间的方法。 该方法包括考虑一个明确的范围,其中明确的范围大于由信号行进的距离。 然后在要确定的距离上传输信号,信号包括至少两个频率分量,基于介质中的明确范围和信号速度的频率分量。 通过使用接收信号的一个频率分量的接收相位特性的方差(例如相位角)与接收信号的另一频率分量的接收相位特性来确定行驶的距离(或飞行时间)。
    • 3. 发明申请
    • METHODS AND APPARATUS FOR DETECTION OF FLUID INTERFACE FLUCTUATIONS
    • 用于检测流体界面波动的方法和装置
    • WO2012117261A1
    • 2012-09-07
    • PCT/GB2012/050489
    • 2012-03-05
    • UNIVERSITY OF BRADFORDHOROSHENKOV, KirillNICHOLS, Andrew
    • HOROSHENKOV, KirillNICHOLS, Andrew
    • G01F23/296G01S7/52G01S7/54G01S15/36
    • G01F1/66G01F23/0069G01F23/2962G01S7/52004G01S7/54G01S15/36
    • Dynamic characteristics of a liquid surface (160) are measured by sending acoustic signals (140) to or more target areas (162a-162c) on the liquid surface and receiving said acoustic signals (150a-150c) after reflection from the target area. The detected signals are processed to measure phase shift between the sent and received acoustic signals, the measured phase shift varying over time. The varying phase shift is used to indicate fluctuations over time in the local height of the liquid surface in the target area. The liquid may be water, effluent etc. flowing in a channel or conduit. With suitable calibration, the measured height fluctuations can be used to infer flow characteristics such as surface roughness, wave height, flow depth, flow velocity, volumetric flow rate, shear stress, sediment transport. Using an array of receivers and target areas, additional spatial and temporal characteristics of the surface and the flow can be measured.
    • 通过在液面上发送声信号(140)到目标区域(162a-162c)或从目标区域反射之后接收所述声信号(150a-150c)来测量液面(160)的动态特性。 检测到的信号被处理以测量发送和接收的声信号之间的相移,测量的相移随时间变化。 变化的相移用于指示目标区域中液面的局部高度随时间的波动。 液体可以是在通道或导管中流动的水,流出物等。 通过适当的校准,测量的高度波动可用于推断流动特性,如表面粗糙度,波高,流量深度,流速,体积流量,剪切应力,泥沙输送。 使用一组接收器和目标区域,可以测量表面和流量的额外的空间和时间特征。
    • 8. 发明申请
    • FMCW DISTANCE MEASUREMENT PROCESS
    • FMCW测距法
    • WO1997001107A1
    • 1997-01-09
    • PCT/EP1996002636
    • 1996-06-19
    • MROSIK, Jan, MichaelNAGEL, JörgSTOJANOFF, Christo, G.
    • G01S17/32
    • G01S17/325G01S7/4818G01S7/497G01S13/34G01S13/36G01S15/34G01S15/36G01S17/36
    • In an FMCW distance measurement process, a wave train of carrier frequency fo is modulated with a time function f(t) and subdivided into a transmission signal and into a reference signal in deterministic phase relationship with the transmission signal; the transmission signal is sent on a transmission section to be measured and the reference signal is supplied to a phase difference-forming arrangement; the signal reflected in the transmission section with a delay that corresponds to propagation time tau is also supplied as a reception signal to the phase difference-forming arrangement that forms the time difference function theta (t) between the phases of reference and reception signals; the phase difference function theta (t) is separately evaluated in a continuous fraction theta = that corresponds to the carrier frequency fo and in an alternating fraction theta SIMILAR (t) that corresponds to the modulation time function f(t); and the propagation time tau proportional to the distance is finally determined by evaluating together both phase difference information.
    • FMCW距离测量方法,其中,所述载波频率的调制波列fo与一个时间函数f(t)和划分为传输信号和在其上的确定性的相位关系的参考信号站立; 要被测量的传输信号放置在传输路径和所述参考信号的相位差形成装置供给上; 反映在传输路径信号的光被延迟作为接收信号还组件提供的运行时间tau; 该装置形成了参考信号和接收信号之间的相位的时间差函数THETA(T); 相位差函数THETA(t)的相对于所述载波频率f相关联的DC分量THETA =和与AC分量THETA相似(t)的相关联的调制时间函数f(t)中的一个由两个相位差的综合评价单独和比例评价的距离运行时间tau 信息来确定。
    • 9. 发明申请
    • METHOD AND APPARATUS FOR PRODUCING AN ACOUSTIC FIELD
    • 用于产生声学场的方法和装置
    • WO2014181084A1
    • 2014-11-13
    • PCT/GB2014/051319
    • 2014-04-29
    • THE UNIVERSITY OF BRISTOL
    • CARTER, Thomas AndrewLONG, Benjamin John OliverSUBRAMANIAN, Sriram
    • H04S7/00
    • G01S7/52004G01S7/52003G01S7/539G01S15/36G01S15/876G01S2007/52007H04S7/30
    • A plurality of control points (10) are defined which each have a known spatial relationship relative to an array of transducers. An amplitude is assigned to each control point (12). A matrix (16) is produced containing elements which represent, for each of the control points, the effect that producing a modeled acoustic field having the assigned amplitude with a particular phase at the control point has on the consequential amplitude and phase of the modeled acoustic field at the other control points (14). Eigenvectors of the matrix (18) are determined, each eigenvector representing a set of phases and relative amplitudes of the modeled acoustic field at the control points. One of the sets (20) is selected and the transducer array is operated to cause one or more of the transducers to output an acoustic wave each having an initial amplitude and phase such that the phases and amplitudes of the resultant acoustic field at the control points correspond to the phases and relative amplitudes of the selected set (22, 24).
    • 定义了多个控制点(10),每个控制点相对于换能器阵列具有已知的空间关系。 向每个控制点(12)分配一个振幅。 产生一个矩阵(16),其中包含元素,对于每个控制点,表示在控制点处产生具有特定相位的具有分配幅度的建模声场的效果在建模声学的相应振幅和相位上 在其他控制点(14)处。 确定矩阵(18)的特征向量,每个特征向量表示控制点处的建模声场的一组相位和相对幅度。 选择组(20)中的一个,并且操作换能器阵列以使一个或多个换能器输出每个具有初始振幅和相位的声波,使得在控制点处的所得声场的相位和振幅 对应于所选择的组(22,24)的相位和相对幅度。