Optical lever measurement method for magnetostrictive effect based on magnetorhrologic grease and measuring device for optical lever measurement method

Abstract

The invention provides a measurement method for a magnetostrictive effect based on magnetorhrologic grease and designs an optical lever sub-nanometer precision micro-displacement measuring device for a dependent variable of the magnetorhrologic grease magnetostrictive effect for solving the problems that no enough attention is paid to the magnetostrictive effect based on the magnetorhrologic grease and a traditional optical lever method is low in measurement precision and the like. The optical lever sub-nanometer precision micrometric displacement measuring device disclosed by the invention consists of a magnetorhrologic grease magnetostrictive effect micro-displacement actuator and an optical lever micro-displacement measuring device based on the magnetorhrologic grease magnetostrictive effect variable. The magnetorhrologic grease magnetostrictive effect micro-displacement actuator acts on an optical lever in a line contact manner; when the magnetorhrologic grease is magnetized, a magnetostrictive effect variable is generated. The magnetostrictive effect variable is subjected to first-stage amplification through the optical lever and then is subjected to second-stage amplification through a lens group, is received and converted into an electrical signal by a PSD (Phase-Sensitive Detector), and finally the dependent variable is obtained. The research on the magnetorhrologic grease magnetostrictive effect is a new trial for research on magnetorheologieal fluid and has an important practical valve for the research on the magnetorheologieal fluid.

Description

technical field [0001] The invention relates to the magnetostrictive effect of ferromagnetic substances and a method and device for measuring the micro-length variation of an object, in particular to the magnetostrictive effect of a magneto-rheological body and the measurement of the strain caused by the magnetostrictive effect. Specifically, the present invention relates to a method and device for measuring the micro-displacement of an optical lever based on the magnetostrictive effect of magnetorheological grease, which can measure the magnitude of the strain of the magnetostrictive effect of magnetorheological grease under the action of an external magnetic field. Background technique [0002] When a ferromagnetic substance is magnetized in a magnetic field, it will slightly elongate and shorten along the direction of magnetization, and after removing the external magnetic field, it will return to its original length. This phenomenon is called the magnetostrictive effect. ...

AI Technical Summary

Problems solved by technology

This prior technology has the advantages of simple operation and non-contact measurement, but there are approximate operations in the optical lever measurement process, the measurement accuracy is reduced, the angle adjustment is difficult, and the nanoscale displacement cannot be measured.

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