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Ultrasonic scanning and detection method based on sonic time reversal method

A technology of time reversal and ultrasonic scanning, which is applied in the analysis of solids using sound waves/ultrasonic waves/infrasonic waves. Detect the effect of dexterity

Inactive Publication Date: 2012-08-01
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of poor focusing effect of single wave packet in traditional ultrasonic phased array scanning, the object of the present invention is to provide an ultrasonic scanning and detection method based on the acoustic wave time reversal method

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  • Ultrasonic scanning and detection method based on sonic time reversal method
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  • Ultrasonic scanning and detection method based on sonic time reversal method

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Embodiment Construction

[0022] The ultrasonic scanning and detection method based on the acoustic time-reversal method of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] figure 1 It is a flow chart of the ultrasonic scanning and detection method based on the acoustic wave time reversal method of the present invention, as figure 1 As shown, the ultrasonic scanning and detection method based on the acoustic time reversal method of the present invention specifically includes the following steps:

[0024] (a) First, preset a focal point A at any position on the area to be detected, and assume that an imaginary sound source is placed at the preset focal point A to emit an acoustic pulse signal, and each array element of the transducer will receive the acoustic signal , this acoustic signal will include multiple wave packets such as longitudinal wave and shear wave, we will denote this acoustic signal as U i (t), whe...

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Abstract

The invention provides an ultrasonic scanning and detection method based on a sonic time reversal method, comprising the following steps: arranging an imaginary sound source at a preset focal point to transmit sound pulses, calculating acoustical signals received by each array element of an energy transducer by a medium structure; carrying out time reversal treatment on the received acoustical signals, and using the acoustical signals as drive pulses to load on the corresponding energy transducer array elements for driving to allow a sound field to focus at the preset focal point; then receiving echo acoustical signals by each array element of the energy transducer, and collecting and storing; carrying out time reversal treatment on the echo acoustical signals, acquiring acoustical signals at the preset focal point by related calculation, using the acoustical signals as detection data to analyze and determine; continuously changing the position of the preset focal point, repeating theabove process, so as to scan and detect the whole detection area. The method utilizes sonic time reversal adaptive focusing and ultrasonic phased array scanning mode to realize ultrasonic scanning and detection of various wave packages which are simultaneously focalized, and high signal to noise ratio and image resolution can be achieved.

Description

technical field [0001] The invention relates to an ultrasonic scanning and detection method based on the acoustic wave time reversal method, which can realize simultaneous focusing, scanning and detection of multiple wave packets. Background technique [0002] Ultrasonic phased array technology is an ultrasonic nondestructive testing technology developed in recent years. This technology can effectively improve the detection speed and the signal-to-noise ratio of the detection signal, and has the characteristics of fast, reliable and accurate. Ultrasonic phased array scanning uses electronic technology to control the time delay and amplitude of the excitation pulses of each array element of the ultrasonic transducer to generate an electronically adjustable ultrasonic focused sound beam in shape and direction, and then to move the transducer without moving the transducer position or less. In the case of the position of the sensor, the area to be inspected is scanned, detected...

Claims

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Application Information

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IPC IPC(8): G01N29/06
Inventor 张碧星
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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