Pressure sensor based on giant magnetostrictive inverse effects

Abstract

The invention discloses a pressure sensor based on giant magnetostrictive inverse effects, which belongs to the field of sensors. The pressure sensor based on giant magnetostrictive inverse effects isstructurally characterized in that the whole structure is an axisymmetric cylindrical structure, a shell is internally provided with a jacket, a magnetic isolation cylinder and a magnetic isolation end cover are adjacently arranged inside, the center of the magnetic isolation cylinder is provided with a through hole, the inner right side of the magnetic isolation cylinder is provided with an upper magnetizer, the left side of the magnetic isolation end cover is provided with a lower magnetizer, a coil frame is used for winding a bias coil, a giant magnetostrictive rod is arranged inside the coil frame, the right side of the giant magnetostrictive rod is provided with a magnetic conductive gasket, the right side of the magnetic conductive gasket is provided with a magnetic isolation steelring, a hall sensor is attached and fixed inside, the left side of the giant magnetostrictive rod is provided with a magnetic conductive block, an ejection rod passes through the through hole, a pre-tightening spring and a pre-tightening bolt respectively, a slight gap is left between, the magnetic conductive block, the upper magnetizer, a cylindrical yoke and the lower magnetizer form a closed magnetic circuit, the pre-tightening bolt and the end cover are fixedly connected through thread, the end cover and the shell are fixedly connected through an internal slot screw, and the internal structure is protected. The structure is compact, firm and reliable.

Description

technical field [0001] The invention belongs to the field of sensors, in particular to a pressure sensor based on giant magnetostrictive reverse effect. Background technique [0002] Pressure sensors are widely used in industry. At present, the typical pressure sensors include: piezoelectric pressure sensors, capacitive pressure sensors, and resistance strain pressure sensors. The piezoelectric pressure sensor is a sensor made based on the piezoelectric effect of piezoelectric materials. Since the output of the piezoelectric pressure sensor is a weak charge, an external voltage amplifier must be added, and the voltage is related to the type and length of the external cable, so It is inconvenient to use actually. The capacitive pressure sensor is a non-contact sensor. Since the capacitance change of the capacitive pressure sensor is very small, it needs to add a complicated signal amplification circuit, so the test system is relatively complicated. The resistance strain typ...

AI Technical Summary

Problems solved by technology

These magnetic measurement methods are either expensive or more complicated to implement in practice

Images