Gyroscope self test by applying rotation on coriolis sense mass
First Claim
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1. A gyroscope comprising:
- a proof mass vibrating along a drive axis;
a transducer for generating a drive motion signal, at a drive frequency, in response to the vibration of the proof mass along the drive axis;
a circuit for generating a self-test signal in response to the drive motion signal, the self-test signal having a frequency substantially twice the drive frequency, the self-test signal to be employed in a self-test or calibration of the gyroscope; and
an actuator configured to receive the self-test signal and to apply the self-test signal to the proof mass thereby inducing a rotation of the proof mass around a sensitive axis at substantially two times the drive frequency to generate a Coriolis force on the proof mass.
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Abstract
A self-test method by rotating the proof mass at a high frequency enables testing the functionality of both the drive and sense systems at the same time. In this method, the proof mass is rotated at a drive frequency. An input force which is substantially two times the drive frequency is applied to the actuation structures to rotate the proof mass of the gyroscope around the sensitive axis orthogonal to the drive axis. An output response of the gyroscope at the drive frequency is detected by a circuitry and a self-test response is obtained.
48 Citations
19 Claims
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1. A gyroscope comprising:
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a proof mass vibrating along a drive axis; a transducer for generating a drive motion signal, at a drive frequency, in response to the vibration of the proof mass along the drive axis; a circuit for generating a self-test signal in response to the drive motion signal, the self-test signal having a frequency substantially twice the drive frequency, the self-test signal to be employed in a self-test or calibration of the gyroscope; and an actuator configured to receive the self-test signal and to apply the self-test signal to the proof mass thereby inducing a rotation of the proof mass around a sensitive axis at substantially two times the drive frequency to generate a Coriolis force on the proof mass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification