Abstract:
Provided herein is a Coriolis vibratory gyroscope (“CVG”). The CVG includes a first plurality of actuators electrically coupled to the vibratory member and arranged about a drive axis of the CVG and operable to obtain a control signal from the controller and provide a voltage sufficient to cause and maintain the vibratory member to vibrate in a first mode of oscillation; a second plurality of actuators electrically coupled to the vibratory member and arranged about a sense axis of the CVG and operable to detect a voltage based on a second mode of oscillation of the vibratory member caused by a rotation of the CVG about an axis of rotation and to provide a counter-balancing signal sufficient to null the voltage based on the second mode of oscillation, wherein the controller is operable to determine a rate of the rotation of the CVG based, in part, on the counter-balancing signal.
Abstract:
Systems and methods are disclosed herein for determining rotation. A gyroscope includes a drive frame and a base, the drive frame springedly coupled to the base. The gyroscope includes a drive structure configured for causing a drive frame to oscillate along a first axis. The gyroscope includes a sense mass springedly coupled to the drive frame. The gyroscope includes a sense mass sense structure configured for measuring a displacement of the sense mass along a second axis orthogonal to the first axis. The gyroscope includes measurement circuitry configured for determining a velocity of the drive frame, extracting a Coriolis component from the measured displacement, and determining, based on the determined velocity and extracted Coriolis component, a rotation rate of the gyroscope.
Abstract:
In a case where (i) accelerations except a specific angular acceleration cause a problem of noise and (ii) low-cost production is required, the present invention provides a device for measuring an angular acceleration which device has reduced noise that is caused by accelerations except the specific angular acceleration, by having an arrangement in which an oscillator is supported by a spring structure capable of greatly restraining movement in directions except a specific rotation direction.A device for measuring an angular acceleration integrally fabricated by a semiconductor microfabrication technology, the device including: an oscillator rotating around a rotating shaft as a center; a plurality of nodes for supporting the oscillator, the plurality of nodes each being provided at a point on a circle whose radius is r and whose center is the rotating shaft; a plurality of parallelogram links each having arms whose length is r, the arms making movement of the plurality of nodes supporting the oscillator become circular movement around the rotating shaft as a center; a supporting section for supporting fixed nodes of the plurality of parallelogram links; a rotation angle detecting section for detecting a rotation angle; and a calculation section for calculating an angular acceleration from the rotation angle.
Abstract:
A circuit device includes a multiplexer that selects an input signal from first to n-th input signals in a time division manner and outputs the selected input signal to an output node, an A/D conversion circuit that receives the first to n-th input signals outputted from the multiplexer to the output node in a time division manner and A/D-converts the received first to n-th input signals in a time division manner, and a buffer circuit provided between an i-th input node and the output node of the multiplexer. The buffer circuit buffers the i-th input signal and outputs the buffered signal to the output node of the multiplexer in a first period. The multiplexer selects the i-th input signal and outputs the selected signal to the output node in a second period. End timing of the second period comes after end timing of the first period.
Abstract:
Systems and methods are disclosed herein for extracting system parameters from nonlinear periodic signals from sensors. A sensor such as an inertial device includes a first structure and a second structure that is springedly coupled to the first structure. The sensor is configured to generate an output voltage based on a current between the first and second structures. Monotonic motion of the second structure relative to the first structure causes a reversal in direction of the current.
Abstract:
An example method may include determining a requested yaw for a body of a robot, where the biped robot comprises a foot coupled to the body via a leg. The robot may then detect, via one or more sensors, a yaw rotation of the body with respect to a ground surface, where the foot is in contact with the ground surface. Based on the detected yaw rotation of the body, the robot may determine a measured yaw for the body. The robot may also determine a target yaw for the body, where the target yaw for the body is between the measured yaw for the body and the requested yaw for the body. The robot may then cause the foot to rotate the body to the target yaw for the body.
Abstract:
A physical quantity sensor element is formed into a plane-shape which extends along an XY plane, and is provided with a driving portion which vibrates in a Z-axis direction, a detecting portion which vibrates in an X-axis direction due to Coriolis effect acting on the driving portion, a beam portion which connects the driving portion and the detecting portion, a fixing portion, and a beam portion which connects the detecting portion and the fixing portion, in which a spring constant of the beam portion in the Z-axis direction is smaller than a spring constant of the beam portion in the Z-axis direction, and a spring constant of the beam portion in the Z-axis direction is greater than a spring constant of the beam portion in the X-axis direction.
Abstract:
Management methods and systems for movement detection are provided. First, the movement of an electronic device is detected by at least one sensor. In response to a specific instruction, a specific movement of the electronic device after the specific instruction is received is recorded. A motion determination process is performed according to the recorded specific movement.
Abstract:
In a first aspect, the angular rate sensor comprises a substrate and a rotating structure anchored to the substrate. The angular rate sensor also includes a drive mass anchored to the substrate and an element coupling the drive mass and the rotating structure. The angular rate sensor further includes an actuator for driving the drive mass into oscillation along a first axis in plane to the substrate and for driving the rotating structure into rotational oscillation around a second axis normal to the substrate; a first transducer to sense the motion of the rotating structure in response to a Coriolis force in a sense mode; and a second transducer to sense the motion of the sensor during a drive mode. In a second aspect the angular rate sensor comprises a substrate and two shear masses which are parallel to the substrate and anchored to the substrate via flexible elements.