Accelerometer with real-time calibration
First Claim
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1. A method of calibrating an acceleration sensor comprising:
- suspending an inertial body using a magnetic fluid;
generating a magnetic field within the magnetic fluid;
modulating the magnetic field to cause a displacement of the inertial body;
measuring a response of the inertial body to the modulation; and
calibrating the acceleration sensor based on the measurement.
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Abstract
A method of calibrating an acceleration sensor includes suspending an inertial body using a magnetic fluid; generating a magnetic field within the magnetic fluid; modulating the magnetic field to cause a displacement of the inertial body; measuring a response of the inertial body to the modulation; and calibrating the acceleration sensor in real time based on the measurement. Current can be driven through a plurality of magnets for generating the magnetic field so as to create the modulation. Sensing coils can be used for detecting the response of the inertial body. The modulation can be periodic, an impulse or some other aperiodic function.
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Citations
37 Claims
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1. A method of calibrating an acceleration sensor comprising:
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suspending an inertial body using a magnetic fluid;
generating a magnetic field within the magnetic fluid;
modulating the magnetic field to cause a displacement of the inertial body;
measuring a response of the inertial body to the modulation; and
calibrating the acceleration sensor based on the measurement. - View Dependent Claims (2, 3, 4, 5)
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6. A method for calibrating an accelerometer comprising:
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suspending an inertial body in a fluid;
applying a predetermined force to the inertial body;
measuring behavior of the inertial body in response to the predetermined force; and
calibrating the accelerometer in real time as a function of the measured behavior. - View Dependent Claims (7, 8)
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9. A method of calibrating an accelerometer comprising:
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suspending an object using a fluid;
generating a magnetic field within the fluid;
delivering a stimulus to the object to cause a displacement of the object;
measuring a response of the object to the stimulus; and
calibrating an accelerometer based on the measurement. - View Dependent Claims (10, 11, 12, 13)
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14. A method of calibrating an acceleration sensor comprising:
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suspending an inertial body using a fluid;
generating a magnetic field within the fluid;
continuously calculating the acceleration based on changes of the magnetic field; and
calibrating the acceleration sensor in real time without interrupting normal functioning of the sensor. - View Dependent Claims (15, 16, 17, 18)
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19. A sensor comprising:
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an inertial body;
a plurality of magnets located generally around the inertial body;
a fluid between the magnets and the inertial body;
a first circuit that modulates magnetic fields generated by the magnets to calibrate the sensor in real time; and
a second circuit that measures acceleration based on displacement of the inertial body. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A sensor comprising:
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an inertial body;
a plurality of magnets generating a repulsive force acting on the inertial body;
a controller that modulates magnetic fields generated by the magnets so as to displace the inertial body; and
a circuit that calculates a response of the inertial body to applied acceleration based on the displacement. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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33. An acceleration sensor comprising:
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an inertial body;
a fluid exerting a force on the inertial body;
a plurality of magnets generating magnetic fields within the fluid;
position sensors detecting a change in position of the inertial body due to acceleration; and
a controller that drives the magnets so as to generate a predetermined movement of the inertial body, wherein the acceleration sensor is calibrated in real time based on measurement of the predetermined movement by the position sensors. - View Dependent Claims (34, 35)
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36. A method of calibrating an accelerometer comprising:
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suspending an object using a fluid;
generating a magnetic field within the fluid;
causing a predetermined displacement of the inertial body;
measuring a force necessary to cause the predermined displacement; and
calibrating an accelerometer based on the measurement.
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37. A method of calibrating an acceleration sensor comprising:
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suspending an inertial body using a magnetic fluid;
generating a magnetic field within the magnetic fluid;
modulating the magnetic field to displace the inertial body in a predetermined manner;
measuring a required modulation for causing the displacement; and
calibrating the acceleration sensor based on the required modulation.
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Specification