Magnetoelastic sensor detection system

Abstract

The invention relates to the technical field of detection systems, in particular to a detection system of a magnetoelastic sensor. It includes a detection unit connected in sequence, an effective value detection circuit, an A / D sampling circuit, a controller, an RS-232 serial port, and a host computer. The controller is connected to the detection unit through an AC excitation signal generation circuit; the detection unit includes an excitation coil, a sensor and a detection coil, the detection coil is sleeved on the sensor and placed inside the excitation coil, and the left and right ends of the excitation coil are respectively placed with permanent magnets. The invention utilizes the excitation coil to generate the excitation magnetic field, and utilizes the detection coil to detect the signal fed back by the sensor; at the same time, the AC excitation signal generation circuit is used to send the excitation signal, and the effective value detection circuit is used to collect the detected signal; and, the permanent magnet is used to provide the DC bias The magnetic field is set, which greatly reduces the power consumption of the system. Its structure is simple, easy to operate, and has strong practicability.

Description

technical field [0001] The invention relates to the technical field of detection systems, in particular to a detection system of a magnetoelastic sensor. Background technique [0002] As we all know, magnetoelastic sensors have many advantages such as wireless passive, low cost, and high sensitivity. in the field of biomedical sensors. Magnetoelastic sensors are usually composed of amorphous amorphous film alloys, such as 1K101, Metglas2826MB and other alloy strips. According to the Joule effect, this material will form periodic stretching vibration in the longitudinal direction under the action of an alternating magnetic field, and its resonance frequency is easily affected by the surrounding environment, which can be used to measure temperature or liquid viscosity. [0003] Traditional magnetoelastic sensor detection systems are mainly based on large-scale laboratory instruments, such as impedance analyzers, network analyzers, lock-in amplifiers, etc. Although these ins...

AI Technical Summary

Problems solved by technology

Although these instruments are simple to build systems, they have many limitations such as expensive instruments, bulky, complex operations, difficulty in integration, and portable use.

In recent years, the resonance characteristic detection system of magnetoelastic sensors based on integrated circuits has made up for some shortcomings of instrument measurement, but there are still shortcomings such as complicated systems and excessive power consumption, which hinder the potential of magnetoelastic sensors in multi-field applications.

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