SENSOR FOR MEASUREMENT OF MECHANICAL DEFORMATIONS Russian patent published in 2018 - IPC G01L1/12 G01B7/24 

FIELD: measuring equipment.

SUBSTANCE: invention relates to a measuring technique and is a mechanical deformation sensor based on amorphous ferromagnetic microwires. Sensor constructively combines a magnetically sensitive element and an electronic measuring device. Magnetosensitive element is an elongated planar, expandable polymer plate, on which an amorphous ferromagnetic microwire is passed from both ends, passing through a measuring coil in the form of oppositely connected solenoids from a copper wire, which, in turn, is located inside the solenoid. Electronic measuring device combines a sinusoidal electric current generator I with a frequency f connected to an amorphous ferromagnetic microwire, a direct current source connected to a solenoid, an amplifier connected to a measuring coil. To form a feedback loop, a frequency generator 2f, a synchronous detector, a feedback amplifier, and a feedback loop are introduced into the electronic measuring device. With the aid of a solenoid, an initial magnetic field H₀, directed along the axis of the amorphous ferromagnetic microwire and magnetizing it to saturation. Sinusoidal electric current I of frequency f is passed through an amorphous ferromagnetic microwire. Differential measuring coil signal is amplified and detected at the doubled frequency of the oscillator 2f and determine the amount of deformation by introducing a stabilizing feedback loop and measuring the feedback signal proportional to the change in the additional magnetic field, which is applied to an amorphous ferromagnetic microwire to hold a fixed value of the output voltage of the differential measuring coil.

EFFECT: expansion of the functionality of the sensor, namely, the linearization of the transfer characteristic of the sensor due to the introduction of a stabilizing coupling circuit over the influencing magnetic field and a corresponding increase in accuracy in the region of small deformations.

1 cl, 3 dwg