A device and method for detecting a target at the bottom of a solid plate based on leaky Lamb waves
A technology of leaking Lamb waves and the bottom of the plate is applied in the field of devices for detecting targets at the bottom of solid plates, which can solve the problems of strong energy, loss, and low efficiency.
Active Publication Date: 2021-02-09
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology
However, based on the acoustic measurement method of sending and receiving, it is necessary to measure the specific conditions under the solid plate point by point, and the incident body wave vertically penetrating the single-layer plate will cause strong energy loss
Therefore, the send-and-receive body wave measurement method has problems such as low efficiency and complicated operation.
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Embodiment 1
[0102] In this embodiment, the solid plate 5 is an aluminum plate, and the target at the bottom of the solid plate is a steel cylinder target. This embodiment is mainly to verify the horizontal and vertical positions of the steel cylinder target at the bottom of the aluminum plate. The aluminum plate determines the horizontal position D and the vertical position h of the steel cylinder target at the bottom of the aluminum plate, and the measurement method is simple and has high precision.
[0103] Among them, the longitudinal wave velocity Cl of the aluminum plate is 6300m / s, the transverse wave velocity Cs is 3100m / s, and the density is ρ 1 =2700kg / m 3 , the thickness of the aluminum plate is d=2.45mm, the speed of sound in water Cw=1500m / s, and the density is ρ 2 =1000kg / m 3 .
[0104] By substituting the above plate and water information into the plate dispersion equation, we can solve the phase, group velocity and attenuation dispersion curve of the leaky Lamb wave in t...
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The invention belongs to the technical field of ultrasonic detection equipment, and particularly relates to a device for detecting a bottom target of a solid plate based on a leaked Lamb wave. The device comprises a first signal transmitter, a first oscilloscope, a first ultrasonic transducer (1), a second signal transmitter, a second oscilloscope, a second ultrasonic transducer (2), the solid plate (5) and a data processing module; and the bottom target (3) of the solid plate is arranged on the lower part of the solid plate (5), the first ultrasonic transducer (1) and the second ultrasonic transducer (2) are oppositely placed and arranged on the solid plate (5), the first ultrasonic transducer (1) and the second ultrasonic transducer (2) are inclined by the angle of theta, the first ultrasonic transducer (1) is further sequentially connected with the first ultrasonic transducer and the first oscilloscope, the second ultrasonic transducer (2) is further sequentially connected with thesecond ultrasonic transducer and the second oscilloscope, and the data processing module is used for calculating the horizontal position and the vertical position of the bottom target (3) of the solidplate according to L1 and L2.
Description
technical field [0001] The invention belongs to the technical field of ultrasonic detection equipment, and in particular relates to a device and method for detecting a bottom target of a solid plate based on leaky Lamb waves, which uses ultrasonic waves to detect the horizontal position and vertical position of the bottom target of an opaque solid plate. Background technique [0002] The Lamb wave is a guided wave formed in a solid plate, which has dispersion characteristics. The relationship between the phase (group) velocity and the frequency-thickness product of each mode can be obtained through the Rayleigh-Lam dispersion equation. Due to the small attenuation and long propagation distance during Lamb wave propagation, most of the detection range can be covered in a short time, and it is widely used in technical fields such as non-destructive testing of large-area plates and shell structures, and material thickness measurement. [0003] Currently, targets on the bottom o...
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IPC IPC(8): G01S15/46
CPCG01S15/46G01S2015/465
Inventor 胡中韬廉国选王小民毛捷
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI