A method and device for measuring the overall magnetostriction coefficient
A magnetostrictive coefficient, overall technology, applied in the direction of magnetostrictive performance measurement, magnetic performance measurement, etc., can solve the problems of high operator requirements, complex equipment structure, residual magnetism, etc., to achieve easy measurement, simple operation, avoid Effect of Poor Magnetic Field Uniformity
Active Publication Date: 2016-05-25
UNIV OF SCI & TECH BEIJING
View PDF2 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The present invention is aimed at the current magnetostriction measurement methods: the strain gauge method cannot measure the overall magnetostriction; although other methods can measure the overall magnetostriction, there are problems such as complex equipment structure and high requirements for operators; the electromagnet cannot provide large In the range of uniform magnetic field, there are problems such as residual magnetism, and a method and device for measuring the overall magnetostriction coefficient are provided
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 specific embodiments, but not as a limitation of the present invention.
[0029] 1. Install the sample. The material of this measurement sample is oriented Tb 0.27 Dy 0.73 Fe 1.95 , with a length of 60mm and a diameter of 12mm. The sample to be tested (3) is placed between the capacitive sensor plate A (21) and the capacitive sensor plate B (22).
[0030] 2. Adjust the pressure application and conveying platform (5) as required, and apply stress from the pressure rod (4) to the sample (3), and the measurement pressure is 20MPa.
[0031] 3. Capacitive sensor (2) position adjustment. Adjust the position of the capacitive sensor (2) on the capacitive sensor plate A (21) back and forth to ensure that the length change caused by the sample (3) to be tested during the measurement is within the measurement range of the capacitive sensor (2).
[0032] 4. Push the sampl...
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 method and device for measuring the integrated magnetostriction coefficient and belongs to the technical field of material performance detection. According to the method, an original capacitance sensor measuring mechanism is improved, the integrated magnetostriction coefficient of materials is measured directly through a capacitance sensor, and a magnet field provided by a solenoid is free of remaining magnetism and large in an even area. A detected sample (3) changes in length along with changes of the magnet field so as to change the distance between a capacitor sensor pole plate A (21) and a capacitor sensor pole plate (B). The capacitance sensor (2) detects the changes of the distance between the pole plates so as to further obtain the magnetostriction coefficient. The method and device have the advantages that the solenoid is used for applying the magnet field, so that the problems of poor evenness and remaining magnetism are effectively avoided; the capacitor sensor is used for measuring the magnetostriction coefficient, so that high-precision measurements of the magnetostriction coefficient of the detected sample can be completed; non-magnetic materials are used for making a pressure rod, so that the influence of the pressure rod on the evenness of the magnet field is reduced; operation is simple, so that operators can measure conveniently.
Description
technical field [0001] The invention belongs to the technical field of material performance detection, and relates to a method and a device for measuring the overall magnetostriction coefficient. Background technique [0002] Since the concept of intelligent materials was put forward in the 1980s, the physical mechanism, preparation process and application in intelligent systems and structures of such materials have rapidly become a research hotspot. Magnetostrictive materials, which play an important role in smart materials, are a class of materials that can sense changes in the external magnetic field and produce their own size changes. The characterization of the performance of magnetostrictive materials is explained by the magnetostrictive coefficient λ. After applying a magnetic field H along the axial direction of a rod-shaped magnetostrictive material with a length of L, the material will produce an elongation of ΔL. Define ΔL / L=λ . [0003] At present, the methods ...
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): G01R33/18
Inventor 高学绪牟星包小倩李纪恒
Owner UNIV OF SCI & TECH BEIJING