Linear expansion coefficient measurement instrument based on Hall effect

Abstract

The invention discloses a linear expansion coefficient measuring instrument based on the Hall effect, which includes a heating module and a deformation measurement module. Components, control circuits, display screens. It is characterized in that: one end of the metal rod to be tested is fixed, and the other end is in contact with the lever; one end of the lever is fixed, and the other end is provided with a Hall element; the position of the Hall element is in a linear gradient magnetic field ; The gradient magnetic field is placed opposite to each other by two identical magnets. The measuring instrument uses two physical methods of lever and Hall effect to amplify the small deformation of the material to be measured in two stages, and realizes the accurate measurement of the linear expansion coefficient. The invention has simple measurement process, intuitive and obvious reading, easy installation and operation, low cost and accurate measurement result.

Description

technical field [0001] The invention relates to the field of physical experiment devices, in particular to an experiment instrument for accurately measuring the linear expansion coefficient of solid materials. Background technique [0002] The coefficient of linear expansion is one of the basic physical properties of solid materials. When the temperature of the object changes, the linear dimensions of the solid material will change with the change of temperature. Typically, as the temperature increases, the size of the solid material will increase. In the design and manufacture of various engineering structures and precision instruments, the linear expansion coefficients of different materials need to be considered, so it is of great significance to measure the linear expansion coefficients of solid materials. Common methods for measuring linear expansion coefficient include optical lever method, interferometry, etc. These methods amplify the deformation of solid material...

AI Technical Summary

Problems solved by technology

[0003] Although the result of measuring linear expansion coefficient by optical method is more accurate, the measurement operation process is relatively cumbersome

The main problems are: (1) The adjustment process is complicated

If it cannot be adjusted accurately to meet the experimental requirements, there will be a large error

(2) The reading is inaccurate and prone to errors

Whether it is reading the scale of the scale or the change of the number of interference fringes, there are large errors, and it is very easy to read data errors.

[0004] To sum up, the traditional optical method is more complicated to measure, the phenomenon is not obvious enough, and the measurement has a large error

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