Low-noise magnetostrictive displacement sensor

A displacement sensor and magnetostrictive technology, applied in the field of sensors, can solve the problems of poor noise reduction, improve signal-to-noise ratio, and complex circuit, and achieve the effects of improving quality, improving detection accuracy, and reducing interference and noise.

Inactive Publication Date: 2010-08-04
SHANGHAI RUNIWILL AUTOMATION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method of noise reduction does not improve the signal-to-noise ratio from the source of the signal. When the noise in the signal source has a large influence, the noise reduction effect is poor, and this method of noise reduction is difficult to adjust due to the complexity of the circuit. Further improve accuracy

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  • Low-noise magnetostrictive displacement sensor

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Embodiment Construction

[0017] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present invention, and any similar structures and similar changes of the present invention should be included in the protection scope of the present invention.

[0018] like Figure 1-Figure 3 As shown, a low-noise magnetostrictive displacement sensor provided by the first embodiment of the present invention includes a housing 9 and a magnet assembly 8, and the housing 9 is equipped with a skeleton 3, a fixed block 12, a waveguide wire 6, and an excitation wire 2 , return wire 11, coil assembly 5, shielding device 4 and measuring circuit 13; Described skeleton 3, fixed block 12 are respectively fixed on the two ends of shell 9 inner walls; Described skeleton 3 is provided with inner hole, and described coil assembly 5 Wrapped around the outer periphery of the inner hole of the skeleton...

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Abstract

The invention discloses a low-noise magnetostrictive displacement sensor, relating to the technical field of sensors and aiming to solve the technical problem of improving the detection precision. The sensor comprises a casing and a magnet assembly; a framework, a fixed block, a waveguide wire, a coil assembly, a shielding device and a measuring circuit are arranged in the casing; the framework and the fixed block are respectively fixed at two ends of the inner wall of the casing; the framework is provided with an inner hole; the near end of the waveguide wire is arranged in the inner hole of the framework and the far end of the waveguide wire is arranged on the fixed block; and the coil assembly and the shielding device are sleeved on the periphery of the inner hole of the framework. The low-noise magnetostrictive displacement sensor is characterized in that the shielding device is a circular permanent magnet; a ferromagnetic protective sleeve is sleeved on the periphery of the shielding device; the coil assembly is a differential coil which consists of two circular windings; and the two circular windings have the same specification, size and turn number as well as opposite winding direction of windings. The sensor has favorable noise reduction effect and can improve the detection precision.

Description

technical field [0001] The invention relates to sensor technology, in particular to a low-noise magnetostrictive displacement sensor technology. Background technique [0002] The magnetostrictive displacement sensor is a non-contact measuring device that uses the Wiedeman effect and the Villary effect of the magnetostrictive material to achieve absolute displacement measurement. It has a large range, non-contact, high precision, and fast speed. , high protection level, low cost and other excellent features, are widely used in machinery, construction, machine tools and other industries. [0003] Since the magnetostrictive displacement sensor works on the basis of electromagnetic signals, it will be affected by the electromagnetic interference of the space electromagnetic field during use, which will lead to the introduction of various interference signals (that is, electrical noise) in the induction coil, and the waveguide wire itself is affected. After excitation, random vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/02
Inventor 张磊赵辉刘伟文陶卫
Owner SHANGHAI RUNIWILL AUTOMATION TECH
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