Capillary type magnetic liquid acceleration sensor
An acceleration sensor and magnetic liquid technology, applied in the field of sensors, can solve the problems of magnet interaction prone to danger, poor sensor stability, unstable mass block, etc., and achieve the effect of solving zero drift, good stability, and accurate and reliable acceleration measurement.
Pending Publication Date: 2020-04-21
TSINGHUA UNIV
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Problems solved by technology
[0003] However, most of the existing magnetic liquid acceleration sensors use a solid mass as a non-magnetic substance. The patent shown in CN201510349208.9 uses a cylindrical mass as a mass, and uses four suspended permanent magnets to provide suspension force. The permanent magnet provides the restoring force, and uses the coil to detect the change of inductance under different acceleration conditions to obtain the output signal. In order to generate the buoyancy force that makes the mass suspend, this patent adds four permanent magnets around the cavity, resulting in a complicated magnetic
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[0044] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0045] The problem to be solved by the present invention is that when the existing magnetic liquid acceleration sensor adopts a solid mass block as the inertial mass, the design of the magnetic circuit is complicated and the stability is poor.
[0046] Combine below Figure 1 to Figure 3 A capillary type magnetic liquid acceleration sensor 1000 according to an embodiment of the present invention will be described.
[0047] Such as figure 1 and figure 2 As shown, the capillary magnetic liquid acceleration sensor 1000 according to the ...
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The invention discloses a capillary type magnetic liquid acceleration sensor. The sensor comprises two clamping assemblies, a capillary tube, a connection tube, two coils and two permanent magnets. The two clamping assemblies are provided with liquid storage cavities for storing magnetic liquids respectively; the two ends of the capillary tube are fixed to the two clamping assemblies correspondingly and are connected with the two liquid storage cavities in a sealed mode correspondingly so that parts of the magnetic liquids in the two liquid storage cavities enters the capillary tube from the two ends of the capillary tube to form two magnetic liquid columns, and an air column or a non-magnetic liquid column immiscible with the magnetic liquids is arranged between the two magnetic liquid columns in the capillary tube; two ends of the connection pipe are connected with the two liquid storage cavities in a sealing manner; the two coils are oppositely arranged on a periphery of the capillary tube in a spaced and sleeving mode; and the two permanent magnets are fixed on the two clamping assemblies and are opposite to the end parts of the two ends of the capillary tube. The capillary type magnetic liquid acceleration sensor has advantages of good stability, a simple magnetic circuit, an accurate measurement result, a long service life and the like.
Description
technical field [0001] The invention relates to the technical field of sensors, in particular to a capillary magnetic liquid acceleration sensor. Background technique [0002] Magnetic fluid is a new type of functional material with fluidity and magnetism, and its unique properties make it widely used in engineering fields. Among them, the unique buoyancy characteristic of magnetic liquid makes the non-magnetic material in the magnetic liquid receive a magnetic field force pointing to the weak magnetic field area in the non-uniform magnetic field. Many magnetic liquid acceleration sensors are designed based on this characteristic of magnetic liquid. of. This feature makes the magnetic liquid acceleration sensor have many advantages such as no wear, high sensitivity and simple structure compared with the traditional acceleration sensor. [0003] However, most of the existing magnetic liquid acceleration sensors use a solid mass as a non-magnetic substance. The patent shown ...
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Login to View More IPC IPC(8): G01P15/105
CPCG01P15/105
Inventor 李德才孙睿
Owner TSINGHUA UNIV