Magnetostrictive stress sensor

Abstract

The invention relates to a giant magnctostrictivc material pressure sensor, which is characterized in that three giant magnctostrictivc material rods are vertically and evenly arranged on an inner circle of a sensor base and two permanent magnetic rods or two excitation windings are arranged vertically and systemically on three giant magnctostrictivc material rods; upper and lower disk magnetic inductive plates are respectively arranged on the above and at the bottom of the three giant magnctostrictivc material rods and the radiuses are a little bit bigger than the mounting radiuses of the permanent magnetic rods or the excitation windings; the magnetizing directions of the two permanent magnetic rods are axial and are the same; the two excitation windings have the same coiling direction and also the same current direction; the length of the permanent magnetic rods or the excitation windings is a little bit shorter than the length of the giant magnctostrictivc material rods to enable a gap between the top of permanent magnetic rods or the excitation windings and the bottom of the upper disk magnetic inductive plat; non-magnetic inductive glue is filled in the gaps to glue Hall units; inductive windings are coiled on the giant magnctostrictivc material rods; the upper disk magnetic inductive plate are arranged on a bearing block, the lower disk magnetic inductive plates are arranged on the base, an outer cover is arranged on the lower disk magnetic inductive plates, and encloses all parts on the base as a whole but the bearing block protrudes out of the upper surface of the outer cover.

Description

technical field [0001] The invention relates to pressure sensor technology, specifically a giant magnetostrictive pressure sensor, and the international patent classification number is proposed to be Int.C1.G01L 9 / 00 (2006.01) technical background [0002] Pressure sensors are widely used in industry. [0003] At present, the most widely used pressure sensors are resistive pressure sensors and piezoelectric pressure sensors. For resistive pressure sensors, the strain gauge must be pasted on the test piece or the elastic element of the sensor when testing the application. Therefore, the performance of the adhesive will directly affect the working characteristics of the strain gauge, which is prone to measurement errors. In addition, resistive pressure sensors are mainly used for the measurement of static force and low frequency dynamic force. Piezoelectric pressure sensors are mainly used for the measurement of dynamic force, because the measurement signal decays quickly wi...

AI Technical Summary

Problems solved by technology

Piezoelectric pressure sensors are mainly used for the measurement of dynamic force, because the measurement signal decays quickly with time, so it is not suitable for the measurement of static force

In addition, the compressive strength of piezoelectric materials is only 4MPa, so the pressure sensor made of piezoelectric materials has a small range and limited application range.

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