Air-coupled ultrasonic high-energy detection method and system
A technology of air coupling and detection method, which is applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, can solve problems such as not being available, and achieve the effect of improving fault tolerance, good adaptability, and improving accuracy
Active Publication Date: 2016-11-16
SOUTHWEST UNIVERSITY
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In the actual operation process, it is necessary to carefully determine the pointing angle before the detection, which will bring a series of complicated preparations. Without these complicated preparations, the ideal signal will not be obtained.
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[0040] The present invention will be further described below in conjunction with accompanying drawing and embodiment: figure 1 It is a schematic diagram of the principle of the present invention.
[0041] Such as figure 1 As shown, the air-coupled ultrasonic high-energy detection method in this embodiment includes
[0042] a. The ultrasonic wave emitted by the transducer at the transmitting end is incident on the DUT at a pointing angle α, and is reflected by the surface of the DUT and the surface of the transducer at the transmitting end in turn, and re-enters the DUT at different incident angles. The tested part is a plate structure;
[0043] b. The transducer at the receiving end is set on the DUT at a pointing angle θ, and the ultrasonic signal is reflected on the surface of the transducer at the receiving end and the surface of the DUT in turn, and is received by the transducer at a new angle.
[0044] After the ultrasonic waves are reflected by the surface of the test...
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The invention provides an air-coupled ultrasonic high-energy detection method and system. The method comprises the steps that ultrasonic waves emitted by a transmitter transducer are emitted into one face of a detected part at a directional angle alpha, are sequentially reflected by the surface of the detected part and the surface of the transmitter transducer and are emitted into the detected part again, wherein the detected part is of a platy structure; a receiver transducer is arranged on the other face of the detected part at a directional angle theta. According to the air-coupled ultrasonic high-energy detection method and system, excited signals and picked signals both achieve high energy on the condition that no more power energy is needed, influences of environmental noise is effectively inhibited, and the detection accuracy is improved; meanwhile, the positions of the transducers do not need to be precisely adjusted deliberately, the fault-tolerant capacity in the detection process is improved, and good adaptability is achieved.
Description
technical field [0001] The invention relates to the field of industrial automatic detection, in particular to an air-coupled ultrasonic high-energy detection method and system. Background technique [0002] Air-coupled ultrasonic testing is a new type of nondestructive testing technology that uses air as the coupling medium. Compared with conventional ultrasonic testing techniques in the field of nondestructive testing (such as water immersion and contact methods), the biggest advantage of air-coupled ultrasonic testing is that it is non-contact and free. Coupling agent, this technology has no essential difference in terms of acoustic propagation characteristics except that air is used as the coupling medium. In addition, air-coupled ultrasonic testing has a good application for defect detection that is not suitable for couplant (such as moving parts, ceramics, microchips, porous sandwiches, composite materials, couplant allergies, etc.). Due to its characteristics of no co...
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IPC IPC(8): G01N29/04
CPCG01N29/04
Inventor 范子川
Owner SOUTHWEST UNIVERSITY