A bending mode magnetostrictive sensor
A bending mode and sensor technology, which is applied in the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, and the use of vibrating fluids, etc., can solve problems such as inability to directly transplant micro-tube structures, unsuitable for practical applications, and complex structures.
Active Publication Date: 2017-05-24
BEIJING UNIV OF TECH
View PDF5 Cites 5 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In "Guided waves by axissymmetric and non-axissymmetric surfaceloading on hollow cylinders", J.L.Rose and other scholars used comb transducers to excite bending mode guided waves to detect pipes, which proved the possibility of bending mode detection defects, and It is proposed that the bending mode signal reflected from the defect may contain the circumferential position information and defect size information of the defect; Y.Y.Kim et al. used topology optimization algorithm in "The optimal design and experimental verification of the bias magnet" to design a kind of excitation The sensor magnetic circuit of relatively pure F(1,2) mode ultrasonic guided wave, but the structure is relatively complicated, which is not suitable for practical application
The above studies are limited to large-diameter pipes, and cannot be directly transplanted into micro-tube structures
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 Construction
[0028] The present invention will be further described below in conjunction with the accompanying drawings and examples, and the following examples are only descriptive and not restrictive, and cannot be used to limit the protection scope of the present invention.
[0029] Such as figure 1 , figure 2 It is a schematic diagram of the structure of the bending mode magnetostrictive sensor. figure 1 It is a schematic diagram of the sensor structure using a permanent magnet, figure 2 Schematic diagram of the sensor structure using 2 permanent magnets. A bending mode magnetostrictive sensor is composed of a cylindrical shell 1 of ferromagnetic material, a permanent magnetic circuit 2 and a flexible printed coil 3 . Among them, the flexible printed coil 3 is directly coated on the outer surface of the cylindrical shell 1 of ferromagnetic material, the two are embedded in the plexiglass shell 6, and then integrally installed on the outside of the tiny round tube 4, the ferromagne...
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
Login to View More Abstract
The invention discloses a bending-mode magnetostriction sensor. The bending-mode magnetostriction sensor comprises a ferromagnet cylinder shell, a flexible printed coil, a permanent magnet circuit and the like. The ferromagnet cylinder shell sleeves a micro round tube, epoxy resin is adhered to the surface of the micro round tube, and the ferromagnet cylinder shell is magnetized by specific magnetic fields provided by the permanent magnet circuit to form static magnetic field distribution beneficial to bending mode excitation. Alternating-current signals are transmitted into the flexible printed coil to generate dynamic magnetic fields, section displacement distribution of the ferromagnet cylinder shell is in conformity to a section vibration form of a bending mode, and finally, bending-mode ultrasonic guided waves are formed in the micro round tube. Through adjustment of a mounting mode of a permanent magnet in the permanent magnet circuit, the bending-mode ultrasonic guided waves with different orders can be excited by the sensor.
Description
technical field [0001] The invention relates to a bending mode magnetostrictive sensor, which belongs to the technical field of electromagnetic acoustic sensors, and can excite and receive bending mode ultrasonic guided waves in a fine round tube. Background technique [0002] There are axisymmetric and non-axisymmetric guided wave types in circular tubes. The former is divided into longitudinal and torsional modes, and the latter has only bending modes. In the field of ultrasonic non-destructive testing, reports on the application of torsional and longitudinal modes for defect detection and location have been common. Due to the complexity of the bending mode wave structure, it is difficult to design a dedicated sensor to excite pure bending mode ultrasonic guided waves. Therefore, there are few studies on the application of bending mode ultrasonic guided waves for nondestructive testing in engineering practice. In "Guided waves by axissymmetric and non-axissymmetric surfa...
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 Patent Type & Authority Patents(China)
IPC IPC(8): B06B1/08G01N29/04
Inventor 刘秀成王磊龚裕吴斌何存富
Owner BEIJING UNIV OF TECH