Method for quadrature-bias compensation in a Coriolis gyro, as well as a Coriolis gyro which is suitable for this purpose
AssigneeLITEF GmbH
InventorsEberhard Handrich, Wolfram Geiger
Life of this patent
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Abstract
A method for quadrature-bias compensation in a Coriolis gyro whose resonator is in the form of a coupled system comprising a first and a second linear oscillator. The quadrature bias of the Coriolis gyro is determined. An electrostatic field is produced by variation of the mutual alignment of the two oscillators with respect to one another. The alignment/strength of the electrostatic field is regulated so that the determined quadrature bias is made as small as possible.
Claims8
A method for quadrature-bias compensation in a Coriolis gyro, whose resonator is in the form of a coupled system comprising a first and a second linear oscillator, in which the first oscillator is attached to a gyro frame of the Coriolis gyro by means of first spring elements and the second oscillator is attached to the first oscillator by means of second spring elements, having the following steps:
- determination of the quadrature bias of the Coriolis gyro,
- production of an electrostatic field, in order to vary the mutual alignment of the two oscillators with respect to one another, with the electrostatic field producing a constant electrostatic force which causes a change in the alignment of the first spring elements and/or a change in the alignment of the second spring elements, and with the alignment/strength of the electrostatic field being regulated such that the determined quadrature bias is as small as possible.
A Coriolis gyro, having a first resonator which is in the form of a coupled system comprising a first and a second linear oscillator, with the first oscillator being attached to a gyro frame of the Coriolis gyro by means of first spring elements, and the second oscillator being attached to the first oscillator by means of second spring elements, having,
- a device for production of an electrostatic field by means of which the alignment of the two oscillators with respect to one another can be varied, in which the electrostatic field produces a constant electrostatic force which varies the alignment angle of the first spring elements with respect to the gyro frame and/or the alignment angle of the second spring elements with respect to the first oscillator,
- a device for determination of any quadrature bias of the Coriolis gyro, and
- a control loop, by means of which the strength of the electrostatic field is regulated as a function of the determined quadrature bias such that the determined quadrature bias is as small as possible.
Dependencies are inferred from the claim text.