Periodic electromagnet array electromagnetic acoustic transducer for generating SH0 guided wave
An electromagnet and electro-acoustic technology, applied in the field of periodic electromagnet array electro-acoustic transducers, can solve problems such as threats to the safety of parts, perforation, corrosion, casualties, etc. The effect of conversion efficiency
Pending Publication Date: 2021-02-02
BEIJING UNIV OF TECH
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Problems solved by technology
However, different types of defects such as cracks, perforations, and corrosion will inevitably occur in the process of production, processing, transportation, and use of metal sheets, which seriously threaten the safety of the parts and may cause major economic losses and casualties.
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[0039] Below in conjunction with accompanying drawing, the present invention will be further described, and given example is only a certain specific size and characteristic experiment of this invention.
[0040] figure 1 Shown is a schematic diagram of the overall structure of the periodic array electromagnet sensor, which is mainly composed of four parts: the runway coil, the electromagnet array, the sensor housing and the plastic gasket. The flexible circuit board is composed of racetrack coils integrated on the flexible circuit board in series. The electromagnet consists of an I-shaped yoke and a solenoid coil wound with enameled wire. The electromagnets are arranged in a staggered array with the direction of current in their solenoid coils reversed. The racetrack-shaped coil in the flexible circuit board is placed on the surface of the board-type test piece to be tested, and the electromagnets arranged in an array are placed above the racetrack-shaped coil. Realization ...
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Abstract
The invention discloses a periodic electromagnet array electromagnetic acoustic transducer for generating SH0 modal guided waves, which belongs to the field of ultrasonic nondestructive detection. Thesensor is composed of a flexible circuit board, an electromagnet array, a sensor shell and a plastic gasket. And the flexible circuit board is formed by connecting runway type coils integrated on theflexible circuit board in series. The electromagnet is composed of an I-shaped magnet yoke and a solenoid coil wound by an enameled wire. The electromagnets are arranged in a reverse staggered arraymode according to the current direction in the solenoid coils of the electromagnets. Based on the Lorentz force effect, the excitation of the SH0 modal guided wave can be realized in the plate. The frequency of the sensor is related to the distance between the center lines of two adjacent electromagnets, the frequency control of the SH0 modal guided wave can be realized by changing the array arrangement interval, and the nondestructive detection of the plate structure is realized.
Description
technical field [0001] The present invention designs a kind of producing SH 0 The guided wave periodic electromagnet array electromagnetic acoustic transducer belongs to the field of ultrasonic nondestructive testing technology, and can excite a single-mode SH in the plate structure. 0 Modal guided waves can be used for non-destructive testing of sheet metal structures. Background technique [0002] Metal sheets made of metal raw materials through casting, forging or rolling are widely used in the fields of automobile and ship manufacturing, construction engineering and aerospace. For example, automobile engine casings, high-speed rail car bodies, interior load bearing parts, and aircraft skins all require a large number of metal sheets, especially stainless steel and aluminum alloy sheets are the most widely used. However, different types of defects such as cracks, perforations, and corrosion will inevitably occur in the process of production, processing, transportation, ...
Claims
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IPC IPC(8): G01N27/90
CPCG01N27/725G01N27/9006
Inventor 宋国荣项靖凯吕炎吕仲天谢龙扬黎耀谦何存富
Owner BEIJING UNIV OF TECH