Device and method for accurately measuring magnetostriction micro-deformation

Abstract

The invention relates to a device for measuring magnetostriction micro-deformation. The device comprises an optical fiber, and one end of the optical fiber is inserted into the tail of an optical fiber ferrule; the optical fiber ferrule is located at the left end of a stainless steel tube cavity; a Terfenol-D metal sheet is arranged at the right port of the stainless steel tube; the preparation method comprises the following steps: inserting one end of an optical fiber into the tail end of a ceramic ferrule, and adhering the interface with epoxy resin; fixing a ceramic contact pin in a stainless steel tube sleeve by using a round plastic plate; and butting a Terfenol-D metal sheet at the top end of the ceramic ferrule. The measuring method comprises the following steps: generating a corresponding magnetic field in a spiral coil; acquiring change data of the cavity length through a computer; measuring the micro-deformation quantity of the magnetostriction Terfenol-D material sheet corresponding to the magnetic field generated by the spiral coil due to multiple groups of different voltages, and carrying out multiple groups of data fitting; and calculating the magnetic field intensityaccording to the measured deformation quantity and the magnetostriction coefficient. The device has the characteristics of simple process, convenience in use, high measurement precision and strong anti-interference capability.

Description

technical field [0001] The invention belongs to the technical field of optical sensing, and in particular relates to a device and method for accurately measuring magnetostrictive micro-deformation. Background technique [0002] The magnetostrictive effect refers to the phenomenon that the magnetic molecules inside the material change from the original disorderly arrangement to the rearrangement along the direction of the magnetic field under the action of an external magnetic field, which eventually leads to a change in the size of the material, and the saturation magnetostriction coefficient lambda s The absolute value is greater than 50×10 -6 The material is called magnetostrictive material. Due to the magnetostrictive effect and its inverse effect, the mutual conversion between mechanical energy and magnetic energy can be realized. The electro-mechanical conversion technology with magnetostrictive materials as the driving and sensitive components has high precision, fas...

AI Technical Summary

Problems solved by technology

The above-mentioned method requires an auxiliary high-precision laser micro-displacement tester for the identification and measurement of the small magnetostriction. Its main disadvantage is that the measurement accuracy and accuracy are easily affected by external interference, and the cost of the auxiliary test equipment required is too high.

Images