MIMO sparse array ultrasonic measurement methods and system for fluctuation interface

A technology of ultrasonic measurement and sparse array, which is applied in the direction of radio wave measurement system, measurement device, liquid/fluid solid measurement, etc., and can solve problems such as large measurement errors

Inactive Publication Date: 2014-08-20
南京华净环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods are mainly composed of one or two ultrasonic transducers, which are single-channel detection systems. These traditional methods only estimate the distance value of a fixed point of the entire liquid level. For the distance measurement of the undulating interface, the above methods are prone to relatively Large measurement error, at present, there is still a lack of a more accurate ultrasonic measurement method for the undulating interface

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  • MIMO sparse array ultrasonic measurement methods and system for fluctuation interface
  • MIMO sparse array ultrasonic measurement methods and system for fluctuation interface
  • MIMO sparse array ultrasonic measurement methods and system for fluctuation interface

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Experimental program
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Embodiment 1

[0119] Such as figure 2 As shown, the criterion for the arrangement of the ultrasonic sparse array element array in this embodiment is: if the spacing of the virtual array elements is set to be d, then the array element spacing of each group of transmitting arrays is d T =2×d, the element spacing of the receiving array is d R =M×d, the distance between each transmitting array and the edge of the receiving array is d. The implementation examples of the present invention all adopt 4 transmitting array elements, whose coordinates are respectively (-135,0), (-105,0), (105,0), (135,0) (unit: mm), and 4 receiving elements Array element, its coordinates are (-90, 0), (-30, 0), (30, 0), (90, 0) (unit: mm).

[0120] The center frequency of the chirp signal is set to 300KHZ, the bandwidth is 60KHZ, and the code in Table 1 below is used for the balanced Gold code.

[0121]

[0122] Table 1 Optimized balanced Gold code with a code length of 127

[0123] The linear frequency modula...

Embodiment 2

[0128] The array of ultrasonic array elements is arranged as figure 2 As shown, the center point of the array is taken as the origin of the coordinate axis, the center frequency of the chirp signal is set to 300KHZ, the bandwidth is 60KHZ, the point target position is set at (14°, 1.2m), and the beamforming focus is checked by changing the position of the beamforming focus The influence of the deviation on the measurement accuracy, where the deviation of the beamforming focus is divided into two directions, the axial direction and the azimuth angle of the synthetic beam. The measurement error is stable within 0.6mm when the beamforming focal point is offset along the composite beam axis in the range of 20mm and the echo SNR is higher than 5, however, the azimuth angle offset will cause a considerable beamforming focal point offset, Cause serious measurement errors, the corresponding simulation (using time-sharing transmission mode) results are as follows Image 6 . from I...

Embodiment 3

[0130] The array of ultrasonic array elements is arranged as figure 2 , take the center point of the array as the origin of the coordinate axis, the center frequency of the chirp signal is set to 300KHZ, the bandwidth is 60KHZ, the balanced Gold code adopts the code in Table 1, and the time-sharing and simultaneous transmission modes are used respectively under different signal-to-noise ratios. Single-point target measurement, the range of signal-to-noise ratio is -30 ~ 15dB, and the point target position is set at (0°, 0.5m). The steps are the same as in Example 1, and the error diagrams of the two transmission modes under different signal-to-noise ratios are obtained ( Figure 7 ).

[0131] from Figure 7 It can be seen from (a) that the method of the present invention can accurately measure the target distance under the condition of low signal-to-noise ratio, especially in the simultaneous transmission mode, it can still work reliably under the condition that the signal-...

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Abstract

The invention discloses two ultrasonic measurement methods and system for coded signal transmission on the basis of MIMO sparse array elements, and belongs to the technical field of ultrasonic measurement. The methods are used for measuring irregular fluctuation interfaces similar to fluctuation liquid levels and snow depths, and accuracy of distance measurement under the situation of the fluctuation interface is effectively improved. According to the methods, the sparse array is utilized for conducting ultrasonic measurement on the fluctuation interface at different angles, and two signal transmission modes, namely the time-sharing transmission mode and the simultaneous transmission mode, are adopted. According to the two transmission modes, signals are transmitted through the sparse array, and beam forming processing is carried out after channel separation of the signals is achieved. According to the methods, the echo signals of different virtual array elements can be effectively distinguished, the beam forming processing is facilitated, and accuracy of distance measurement of the fluctuation interface is improved; in addition, the simultaneous transmission mode is adopted to be applied to measurement of rapid changes of the fluctuation interface, distance ambiguity generated by the rapid changes of the fluctuation interface is avoided, and therefore the accuracy of the measurement is improved.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic measurement, and in particular relates to two ultrasonic measurement methods of MIMO sparse arrays for measuring fluctuating liquid levels, snow depths and other undulating interfaces and a measurement system capable of realizing these methods. Background technique [0002] Ultrasonic measurement is a cost-effective measurement method widely used in various industries. For example, in the field of meteorology, the measurement of rainfall and evaporation can be realized by means of ultrasonic liquid level measurement, and the measurement of snow depth can be realized by means of ultrasonic distance measurement. However, while acquiring these meteorological elements with ultrasonic measurement methods, the traditional point ultrasonic measurement method is likely to produce large measurement errors due to liquid level fluctuations or interface fluctuations. [0003] To reduce measurement errors ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/06G01S15/08
CPCG01F23/296G01S15/325
Inventor 李鹏尹杰王银娟蔡玉雷
Owner 南京华净环保科技有限公司
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