A magnetostrictive displacement sensor suitable for large temperature range/high temperature environment

A technology of displacement sensor and magnetostriction, which is applied in the field of displacement sensor, can solve the problems of reducing the measurement accuracy of sensor displacement, achieve the effect of widening the operating temperature range, increasing the working temperature, and improving the measurement accuracy

Active Publication Date: 2020-10-16
HEBEI UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, since the current magnetostrictive displacement sensors all work near room temperature, the displacement is calculated according to the fixed sound velocity near the room temperature of the waveguide wire material as a parameter, and there is no need to consider the change of the sound velocity of the waveguide wire with temperature; When working in a large temperature range, the change of sound velocity of the waveguide wire at different temperatures will reduce the displacement measurement accuracy of the sensor, so the existing displacement sensor is no longer applicable

Method used

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  • A magnetostrictive displacement sensor suitable for large temperature range/high temperature environment
  • A magnetostrictive displacement sensor suitable for large temperature range/high temperature environment
  • A magnetostrictive displacement sensor suitable for large temperature range/high temperature environment

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Embodiment 1

[0050] Embodiment 1: Under the same conditions, Fe-Ga and Fe-Ni were respectively used as waveguide wires for comparative experiments. The main purpose of this embodiment is to compare the Fe-Ga waveguide wire with the traditional Fe-Ni waveguide wire, and verify the reliability of the Fe-Ga waveguide wire at high temperature.

[0051] The experimental platform is built: the detection coil is 10cm away from the top of the waveguide wire, the movable magnetic ring is 30cm away from the detection coil, and the fixed magnetic ring is 60cm away from the detection coil. Use samarium cobalt as the magnetic ring, place it in a high-temperature furnace for testing at 25°C to 500°C, and observe the output waveform of the detection coil with an oscilloscope.

[0052] Experimental process and results: such as Figure 5 , Figure 6 As shown, Fe-Ga is heated from 25°C to 500°C, and the detected voltage signal gradually decreases with the increase of temperature, the maximum is 129.3mV, a...

Embodiment 2

[0053] Example 2: Using figure 1 The device shown is tested in a variable temperature environment to verify the accuracy of the displacement sensor in measuring displacement.

[0054] The experimental platform is built: the detection coil is 10cm away from the top of the waveguide wire, and the float is 60cm away from the detection coil. Place the Fe-Ga waveguide wire in a high-temperature furnace for testing at 25°C to 500°C.

[0055] Experimental process and results: such as Figure 7 As shown, the sound velocity of the Fe-Ga waveguide wire changes at different temperatures, and it is necessary to compensate and correct the displacement for different temperature fields. According to the measured fitting curve, the sound velocity v=2710.54814-0.354*T, where T is the average temperature measured by the thermocouple. The time interval t between the time when the detection coil senses the torsional wave signal of the movable magnetic ring and the time when the driving pulse i...

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Abstract

The invention discloses a magnetostrictive displacement sensor suitable for a large temperature range / high temperature environment. The sensor comprises a pulse generating circuit, a constant elasticdevice, a detecting coil, a control sampling module, a magnetostrictive waveguide wire, a casing, a thermocouple, a waveguide wire insulating sleeve and a material level mark. A left side of the casing is a component bin, a right side of the casing is a hollow pipe, and the component bin and the hollow pine communicate with each other and have the same center axis. The magnetostrictive waveguide wire is Fe-Ga or Fe-Co material. The waveguide wire is fixed in the sensor casing. The detection coil sleeves a left side of the waveguide wire. The material level mark sleeves a right end of the casing. A magnetic material of the sensor obtained by the invention has a higher Curie temperature, and the novel displacement sensor can be applied to a high-temperature environment below 500 DEG C.

Description

technical field [0001] The present invention applies magnetostrictive Fe-Ga and Fe-Co materials to the field of displacement sensors, and mainly relates to magnetostrictive displacement sensors based on Fe-Ga and Fe-Co materials, which can be applied to large temperature ranges and high-temperature environments to realize Accurate position measurement in wide temperature range and high temperature environment. The core part of the displacement sensor is a high Curie temperature magnetostrictive material waveguide wire, a circular permanent magnet, a detection coil, a thermocouple, a constant elastic force device, a pulse circuit, and a detection circuit. It is characterized by high measurement accuracy, can be applied to high temperature (up to 500 ℃), does not need zero calibration, and can perform multi-point measurement. Background technique [0002] The magnetostrictive displacement sensor is an absolute displacement sensor realized by using the Weidmann effect of the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/02
CPCG01B7/02
Inventor 李明明王千王博文黄文美
Owner HEBEI UNIV OF TECH
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