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Variable-wavelength low-order shear-horizontal-wave electromagnetic acoustic transducer

A horizontal shear wave, electromagnetic ultrasonic technology, which is applied in the generation of ultrasonic/sonic/infrasonic waves, and the use of vibrating fluids. Sex and other issues, to achieve the effect of strong adaptability and flexibility

Active Publication Date: 2014-06-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, because the original permanent magnet array SH mode EMAT transducer cannot change the wavelength and lacks the flexibility of adjustment, it cannot adapt to a variety of measured objects in actual detection.

Method used

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  • Variable-wavelength low-order shear-horizontal-wave electromagnetic acoustic transducer
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  • Variable-wavelength low-order shear-horizontal-wave electromagnetic acoustic transducer

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Embodiment

[0049] The content of the invention will be further described below in conjunction with a specific example.

[0050] Solder two 15cm-long wires at the position of the PCB21 pad, and peel off the 0.5cm long wire sheath at the wire welding end 4cm away from the pad (such as Image 6 ), of course, you can also lead out the wires here separately; press figure 1 , figure 2 Assemble the other parts; shorten the distance between the magnets to the shortest; use an impedance analyzer to perform impedance matching, and weld the two pins of the capacitor to the free end of the two wires where the 0.5cm long skin is stripped or the lead wire is firmly welded. And use insulating tape to seal the exposed part of the wire and the metal pin of the capacitor; weld the free ends of the two 15cm long wires to the shaft of the BNC connector shell and the core respectively; install the end cover to complete the entire electromagnetic ultrasonic transducer. energy device assembly.

[0051] Use...

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Abstract

The invention relates to a variable-wavelength low-order shear-horizontal-wave electromagnetic acoustic transducer which can be used for ultrasonic flaw inspection for conductor materials, and belongs to the technical field of nondestructive inspection. An array-magnet equidistant change driving system mainly functions in providing a bias magnetic field with variable magnet spacing, namely variable wavelength, to an electrical system of the transducer. The SH (shear horizontal) modal magnet array type EMAT (electromagnetic acoustic transducer) can better meet inspection requirements by changing wavelength and changing excitation frequency at the same time, and the transducer can be adjusted according to actual inspection requirements. Therefore, the EMAT has higher adaptability and flexibility.

Description

technical field [0001] The invention relates to a variable-wavelength low-order horizontal shear wave electromagnetic ultrasonic transducer, which can be used for ultrasonic flaw detection of conductor materials and belongs to the technical field of non-destructive testing. Background technique [0002] An ultrasonic transducer is a detection device that converts high-frequency electrical energy into mechanical energy to emit ultrasonic waves, and then uses its inverse effect to convert mechanical energy into electrical energy to receive ultrasonic waves. At present, ultrasonic transducers used in the field of non-destructive testing technology mainly include piezoelectric transducers (PZT or PVDF) and electromagnetic ultrasonic transducers (Electromagnetic Acoustic Transducer, EMAT for short). [0003] The EMAT transducer is a transducer device that excites and receives ultrasonic waves in a conductor. The generation and reception of ultrasonic waves in non-ferromagnetic m...

Claims

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Application Information

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IPC IPC(8): B06B1/08G01N29/34
Inventor 焦敬品闫军生刘增华宋国荣吴斌何存富
Owner BEIJING UNIV OF TECH
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