Phase control annular ultrasound focusing method

Abstract

The invention relates to an ultrasonic focusing or orientation method, in particular to a phase control circular ring shaped ultrasonic focusing method for controlling the local ultrasonic energy density, and solves the problem that the prior ultrasonic energy focusing is poor. The method comprises the following steps: S1: the step of deciding the target location and the size according to the measurement; S2, the step of setting the position of a circular ring Rh according to the distance from the edge of the target to the array of a ultrasonic transducer; S3: the step of determining the actual focal position Rf according to the size of the target and the definite operating position, and accurately calculating the diameter d of the circular ring according to the formula (3); S4: the step of accurately adjusting and controlling the operating position; S5: the step of accurately calculating the advanced emission time for the array elements on each distribution position according to the formulas (1) and (2), and exciting each array element to realize the circular ring shaped focusing. The method can improve the focusing effect of the ultrasonic energy to the focus area (operating target area), improve the ultrasonic energy density in the operating target area, and simultaneously reduce the ultrasonic energy density in the non-operating target area.

Description

technical field [0001] The invention relates to a method for focusing or directing ultrasound, that is, a method for controlling the focusing of local ultrasound energy density. The method is to focus the ultrasonic wave on the set ring by adjusting the excitation signal of each array element in the phased array focused ultrasonic transducer, and set and adjust the position and diameter of the ring according to the size and position of the target. Size, to achieve the precise adjustment and control of the working focal length (target area), to provide the phase control circular ultrasonic focusing method of the ultrasonic energy required by the target area. Background technique [0002] At present, focused ultrasound has been widely used in various fields such as industry, agriculture, and medicine, such as industrial processing, flaw detection, medical diagnosis, treatment, etc. High-intensity focused ultrasound technology has the advantages of large penetration depth, stro...

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Problems solved by technology

[0006] The above-mentioned ultrasonic focusing methods currently used, whether through mechanical or electronic phase control focusing, focus on a certain point, but the disadvantage in actual work is that the effect of ultrasonic energy focusing is not good, and in order to achieve the desired Energy is required, and a certain high-energy area is inevitably formed in the non-working area in front of the focus. These high energies will damage the area in front of the focus and cause the sound energy at the focus to be lost and energy efficiency to decrease, such as Figure 7 , 8 As shown, under the same condition of obtaining the maximum energy density at the focal point, the maximum energy density of point focusing on the section 70mm away from the array in front of the focal point is 10% higher than that of the annular ultrasonic focusing method, and this acoustic energy is wasted in the non-working area in front of the focal point and can cause damage to non-working areas

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