Omnidirectional S0 modal Lamb wave electromagnetic ultrasonic transducer
An electromagnetic ultrasonic and transducer technology, which is applied in the direction of material analysis, instruments, and scientific instruments using sonic/ultrasonic/infrasonic waves to achieve strong excitation and reception suppression capabilities, increase amplitude, increase transduction efficiency and The effect of purity
Active Publication Date: 2018-10-19
HARBIN INST OF TECH
View PDF15 Cites 7 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] In order to solve the problem that the existing S0 mode Lamb wave electromagnetic ultrasonic transducer cannot perform excitation suppression and reception suppression on the A0 mode Lamb wave and the A1 mode Lamb wave, the present invention proposes an omnidirectional S0 Modal Lamb wave electromagnetic ultrasonic transducer
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0053] Embodiment: combine below Figure 1 to Figure 16 This embodiment will be described in detail.
[0054] refer to figure 1 , the omnidirectional S0 mode Lamb wave electromagnetic ultrasonic transducer described in this embodiment includes a housing 1, a back plate 2, a cylindrical magnet 3, a hollow cylindrical magnet 4 and an excitation coil;
[0055] Cylindrical magnet 3 is of the same height as hollow cylindrical magnet 4, and the end face of hollow cylindrical magnet 4 is annular;
[0056] One end of the housing 1 is open, the cylindrical magnet 3 and the hollow cylindrical magnet 4 are vertically, coaxially and concentrically arranged inside the housing 1 through the back plate 2, and the cylindrical magnet 3 is located inside the hollow cylindrical magnet 4 , the end of the cylindrical magnet 3 away from the back plate 2 is flush with the opening end of the housing 1, and the polarity of the cylindrical magnet 3 and the hollow cylindrical magnet 4 are set opposite...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| Thickness | aaaaa | aaaaa |
| Wavelength | aaaaa | aaaaa |
| Diameter | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses an omnidirectional S0 modal Lamb wave electromagnetic ultrasonic transducer, belongs to the technical field of electromagnetic ultrasonic detection, and solves the problem theexisting S0 modal Lamb wave electromagnetic ultrasonic transducer cannot perform simulation inhibition and receiving inhibition on A0 modal Lamb wave and A1 modal Lamb wave. The transducer adopts a structure that a first annular sub coil to a number 2N plus 1 annular sub coil are separately closely distributed along the outer edge of a cylindrical magnet and the inner and outer edges of a first hollow cylindrical magnet to the inner and outer edges of a number N hollow cylindrical magnet. The amplitude of stimulated S0 modal Lamb wave is effectively increased through the setting of the radiusin the first annular sub coil, the width of an annular sub coil and the minimum distance between two adjacent annular sub coil, Fourier decomposition amplitude of wave numbers of the A0 modal Lamb wave and the A1 modal Lamb wave is the minimum in a selected operating point, and further the transducer has high simulation inhibition capacity and receiving inhibition capacity on the A0 modal Lamb wave and the A1 modal Lamb wave.
Description
technical field [0001] The invention relates to an electromagnetic ultrasonic transducer, which belongs to the technical field of electromagnetic ultrasonic detection. Background technique [0002] In recent years, as an emerging non-destructive testing technology, electromagnetic ultrasonic tomography has been increasingly used in the defect detection of metal sheets. [0003] Existing electromagnetic ultrasonic tomography usually adopts A0 mode Lamb wave or S0 mode Lamb wave as the detection guide wave. Among them, the A0 mode Lamb wave has a larger wavelength and a slower wave speed, and its ability to distinguish internal defects of the metal sheet is weak. When a defect is encountered, part of the energy of the Lamb wave in the A0 mode may be converted into a Lamb wave in the S0 mode with a faster wave speed, which will affect the accurate measurement of the arrival time of the Lamb wave in the A0 mode. Compared with the Lamb wave of the A0 mode, the Lamb wave of the ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G01N29/32B06B1/04
CPCB06B1/045G01N29/32G01N2291/0234G01N2291/0427
Inventor 康磊麦建伟赵辉马一博刘梦晗赵钧张超
Owner HARBIN INST OF TECH