Acoustic beam focusing time delay control method for ultrasonic phased array imaging in pipeline
An ultrasonic phased array and control method technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, instruments, etc. The dynamic configuration of the excitation sound field, variable direction scanning, and narrow scanning range, etc., achieve the effect of improving real-time requirements
Active Publication Date: 2020-04-24
TIANJIN UNIV
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Problems solved by technology
[0004] The traditional ultrasonic tomography technology based on single-element probes has certain limitations: the sound waves emitted by single-element probes are fan-shaped (conical), the scanning range is narrow, and the sidelobe attenuation is large under the condition of wide emission angles. The installation position and direction of the wafer probe are fixed, and the dynamic configuration of the exciting sound field and the variable scanning direction cannot be realized.
The sound wave is transmitted from the probe array element to the field and needs to pass through the physical boundary and produce nonlinear effects such as amplitude attenuation and direction change, resulting in large errors in the control effect of the sound beam focusing time delay and even control failure
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[0019] The method for controlling the time delay of sound beam focusing for ultrasonic phased array imaging in a pipeline according to the present invention, the steps are as follows:
[0020] Step 1: Ultrasonic phased array sensor arrangement. The ultrasonic sensor array is composed of multiple ultrasonic phased array probes. Each ultrasonic phased array probe is a linear array composed of a fixed number of array elements. Each array element has the same performance parameters and can be independently excited or received. They are arranged at equal intervals in the counterclockwise direction, and are embedded in the outer wall of the pipeline. The sensor surface is parallel to the tangential direction of the outer wall of the pipeline, and is coupled with the outer wall of the pipeline by a couplant.
[0021] Step 2: Ultrasonic phased array sensor excitation and reception. According to the cyclic excitation scheme, ultrasonic phased array probes are selected for excitation i...
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The invention relates to an acoustic beam focusing time delay control method for ultrasonic phased array imaging in a pipeline. The acoustic beam focusing time delay control method comprises the following steps: S1, arranging ultrasonic phased array sensors; S2, exciting the ultrasonic phased array sensors and receiving signals; S3, performing deflection at any angle in a field domain taking a circular pipeline as a boundary, and calculating the time delay of each array element according to the time delay of each channel; and S4, allocating the time delay calculated in the step S3 to array element excitation channels of the ultrasonic phased array probes, delaying the same excitation electric signal by different time to generate excitation electric signals with the same amplitude and different phases, applying the excitation electric signals to the array elements of the phased array probes to generate ultrasonic excitations with the same amplitude and different phases, and generating ultrasonic focusing waves with different focusing distances through the superposition, cancellation and interference effects of the excitation electric signals. Effective control over acoustic beam focusing at any point in a pipeline is achieved.
Description
technical field [0001] The invention belongs to the technical field of ultrasonic tomography, and relates to a time delay control method for sound beam focusing, which is used for solving the problems of errors and control failures caused by the refraction of curved tube walls during the focusing process of ultrasonic phased array sound beams, and realizes industrial Visual testing of high-precision sound field configuration and multiphase medium distribution in closed pipelines during the process. Background technique [0002] Ultrasonic Tomography (UT) is a structural imaging technology that reconstructs the measured field by arranging an ultrasonic sensor array outside the measured field and applying a certain excitation to obtain boundary voltage measurement data. Internal refractive index, attenuation coefficient or acoustic impedance distribution. Compared with other soft-field imaging techniques such as Electrical Impedance Tomography (EIT) and Magnetic Impedance Tom...
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IPC IPC(8): G01N29/06G01N29/22
CPCG01N29/0672G01N29/22
Inventor 谭超李占鹏刘皓董峰
Owner TIANJIN UNIV