Fe-Ga material based magnetostriction liquid-level sensor

Abstract

The invention discloses a Fe-Ga material based magnetostriction liquid-level sensor. The liquid-level sensor is composed of a sensor head, a measuring rod and a floater, the sensor head is connected with the measuring rod in a threaded manner, and the moving floater sleeves the lower portion of the measuring rod. The sensor head is of a cylindrical structure, and a hardware circuit system, a detecting device and a front damping device are arranged in the sensor head. A Waveguide wire is made of Fe-Ga materials and arranged in the measuring rod. The front end of the waveguide wire enters the sensor head through a threaded hole and sequentially penetrates a coil frame in the detecting device and the center of the front damping device till to the hardware circuit system. The tail end of the waveguide wire penetrates the center of a rear damping device to be connected with a return lead, the return lead is connected to a hardware circuit to form a closed loop. The Fe-Ga alloy is used as materials of the waveguide wire of the magnetostriction liquid-level sensor and can be applied to wide-range liquid-level sensors, and the Fe-Ga material based magnetostriction liquid-level sensor can stably work in the severe environment.

Description

technical field [0001] The invention belongs to the field of magnetostrictive sensors, in particular to a magnetostrictive liquid level sensor made of Fe-Ga material. Background technique [0002] There are many kinds of liquid level sensors, currently commonly used liquid level sensors are mainly divided into two types, contact liquid level sensors and non-contact liquid level sensors, contact liquid level sensors can be divided into capacitive liquid level sensors, servo Type liquid level sensor, float type liquid level sensor, manual measuring ruler, etc. Among them, the capacitive liquid level sensor needs to be re-calibrated and regularly maintained after installation, and the measurement repeatability is not high, and the service life is not long; the servo liquid level sensor installation Complex, because it is a mechanical measuring device, mechanical wear will directly affect the measurement accuracy, and it is not suitable for the measurement of corrosive, toxic, f...

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Problems solved by technology

In addition, because the sensor adopts non-contact measurement, its performance is reliable, and its trouble-free working time is long. It has become a new favorite in the field of liquid level measurement. However, Fe -Ni alloy, its low magnetostriction coefficient is about 2.2×10 -5 ~2.7×10 -5 ppm, low magnetic field sensitivity, poor temperature characteristics

There is no report on a liquid level sensor with a simple structure based on Fe-Ga alloy as the waveguide wire material

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