Waveform generation system and generation method of ultrasonic pulse excitation signals

Abstract

The invention discloses a waveform generation system and a generation method of ultrasonic pulse excitation signals and belongs to the technical field of ultrasonic non-destructive detection. The method disclosed by the invention specifically comprises the steps that (1) the ultrasonic pulse excitation signals are broken up into multiple sine components; (2) parameters of each sine component are determined respectively; (3) instant data of each sampling point of a sine wave component is acquired by a sine wave recursion generation formula; (4) the step (3) is repeated, and the instant data of each sampling point of all the sine wave components is acquired; and (5) each piece of sine component data is overlaid, so that the ultrasonic pulse excitation signals can be obtained. In addition, the invention also establishes the waveform generation system by the waveform generation method. According to the invention, related algorithms are simple; and implementation cost of hardware is low. Through application of the method, the ultrasonic pulse excitation signals with adjustable output frequency, an adjustable range value and an adjustable initial phase can be output, so that flexibility of control of the ultrasonic pulse excitation signals can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic non-destructive testing, and in particular relates to a waveform generating system and a generating method of an ultrasonic pulse excitation signal. Background technique [0002] In the ultrasonic phased array imaging detection system, by controlling the initial phase of the ultrasonic pulse signal emitted by each transducer in the array, the propagation direction of the sound beam can be changed to obtain local energy focusing. In order to improve the lateral resolution of the imaging system and reduce artifacts, when detecting a certain focus position, it is expected that the energy of the sound field is concentrated at the focus, that is, the main lobe of the sound field is prominent, and the side lobes and grating lobes are suppressed as much as possible. For this reason, in the ultrasonic detection system, higher requirements are put forward for the excitation signal of the transmitting ar...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a waveform generation system and method for an ultrasonic pulse excitation signal, which uses a recursive method to generate multiple sine wave signal components separately, and superimposes a plurality of sine wave signal components to obtain the desired ultrasonic pulse excitation signal waveform. The method can output an ultrasonic pulse excitation signal with adjustable frequency, amplitude and initial phase, and solves the problem of single signal output form and poor waveform generation flexibility in the prior art when generating an ultrasonic pulse excitation signal

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