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Magnetofluidic accelerometer with partial filling of cavity with magnetic fluid

a magneto-fluidic accelerometer and cavity technology, applied in the direction of speed measurement using gyroscopic effects, devices using electric/magnetic means, volume/mass flow by dynamic fluid flow effect, etc., can solve the problem of changing the distribution of magnetic fields inside the magnetic fluid

Inactive Publication Date: 2007-01-04
INNALABS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration reduces hydrodynamic resistance, thereby improving the frequency response and sensitivity of the accelerometer while minimizing the use of costly magnetic fluid, leading to more efficient acceleration measurement.

Problems solved by technology

The inertial body therefore “presses” against the magnetic fluid, disturbing it and changing the distribution of the magnetic fields inside the magnetic fluid.

Method used

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  • Magnetofluidic accelerometer with partial filling of cavity with magnetic fluid
  • Magnetofluidic accelerometer with partial filling of cavity with magnetic fluid
  • Magnetofluidic accelerometer with partial filling of cavity with magnetic fluid

Examples

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Embodiment Construction

[0028] Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

[0029]FIGS. 1-5 illustrate an exemplary embodiment of a magnetofluidic acceleration sensor of the present invention. The general principles of operation of the magnetofluidic sensor are described in U.S. Pat. No. 6,466,200, which is incorporated herein by reference. The sensor's behavior is generally described by a set of non-linear partial differential equations, see U.S. Provisional Patent Application No. 60 / 614,415, to which this application claims priority.

[0030] In particular, FIG. 1 illustrates an isometric three-dimensional view of an assembled acceleration sensor. FIG. 2 illustrates a side view of the acceleration sensor with one of the drive magnet casings removed. Note the inertial body in the center.

[0031]FIG. 3 illustrates a partial cutaway view showing the arrangements of the drive magnet coils and the sensing coils. FIG....

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Abstract

A sensor includes a housing and a magnetic fluid within the housing that incompletely fills the housing. An inertial body is in contact with the magnetic fluid. Displacement of the inertial body relative to the magnetic fluid is indicative of acceleration on the housing. The acceleration includes linear and / or angular acceleration. The inertial body can be an air bubble, or a dissimilar liquid. A plurality of magnets are mounted on the housing, wherein the magnetic fluid is positioned in droplets between the magnets and the inertial body. The magnetic fluid can be a single droplet between each magnet and the inertial body, or multiple droplets between each magnet and the inertial body. The remaining volume in the housing can be filled with a non-magnetic fluid.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation-in-part of U.S. patent application Ser. No. 10 / 980,791, entitled MAGNETOFLUIDIC ACCELEROMETER WITH ACTIVE SUSPENSION, filed Nov. 4, 2004, a continuation-in-part of U.S. patent application Ser. No. 11 / 006,567, entitled MAGNETOFLUIDIC ACCELEROMETER WITH NON-MAGNETIC FILM ON DRIVE MAGNETS, filed Dec. 8, 2004, a continuation-in-part of U.S. patent application Ser. No. 10 / 992,289, entitled ACCELEROMETER WITH REAL-TIME CALIBRATION, filed Nov. 19, 2004, a continuation-in-part of U.S. patent application Ser. No. 11 / 010,329, entitled HOUSING FOR AN ACCELEROMETER USING MAGNETOFLUIDIC EFFECT, filed Dec. 14, 2004, all of which are incorporated by reference herein in their entirety. [0002] This application claims the benefit of U.S. Provisional Patent Application No. 60 / 616,849, entitled MAGNETOFLUIDIC ACCELEROMETER AND USE OF MAGNETOFLUIDICS FOR OPTICAL COMPONENT JITTER COMPENSATION, Inventors: SUPRUN et al., file...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01P3/44
CPCG01P1/023G01P15/0888G01P15/18G01P15/11G01P15/105G01P15/02
Inventor PRISTUP, ALEXANDER G.ROMANOV, YURI I.
Owner INNALABS