SU446777A1 - Magnetoelastic force sensor - Google Patents

Description

The invention relates to the field of measurement technology and can be applied in the mining, engineering and other industries.

Known magnetoelastic force sensors containing cores, field windings and counter-connected signal windings.

The disadvantage of the known sensors is low accuracy due to the significant zero signal.

The proposed sensor differs from those known in that a capacitor and a resistor are connected to the signal windings, forming a resonant circuit tuned to twice the excitation frequency.

This increases the measurement value.

The drawing shows the scheme of the described sensor, containing two identical ferrite cores 1,2 with excitation windings 3, 4 and signal windings 5, 6 switched in opposite, capacitance

And an 8p resistor is connected to the generator 9.

V Signal windings, capacitance and resistor form a resonant circuit tuned to twice the excitation frequency.

The excitation current periodically saturates the cores I, 2 and modulates their magnetic permeability with a double frequency. As a result

This is why parametric oscillations occur in the resonant circuit. In the absence of an input action, the signal at the output of the sensor, taken from tank 7, is practically zero. The input effect P applied to core I changes its magnetic permeability. The latter leads to the imbalance of the parametric

0 contour. At the output of the sensor, a double frequency signal is generated, which is proportional to the measured force. Resistor 8 provides stability parametric codeb circuit.

SUBJECT OF INVENTION

A magnetoelastic force sensor containing cores, excitation windings and counter-connected signal probes, characterized in that, in order to improve accuracy, a resistor and resistor are included in the signal pins that form a resonant circuit tuned to twice the excitation frequency.