摘要:
A suspended, coupled micromachined structure including two proof masses and multiple support arms configured to suspend the masses above a substrate and a coupling spring element having two ends. Each end of the coupling spring element may be attached to a proof mass at a point between the proof masses. The frequency response characteristics of the proof masses may be improved.
摘要:
A system for tracking the motion of an object relative to a moving reference frame includes a first inertial sensor mounted on the tracked object; a second inertial sensor mounted on the moving reference frame; a third inertial sensor mounted on the moving reference frame and spaced apart from the second inertial sensor; and an element coupled to said first and second and third inertial sensors and configured to determine a position of the object relative to the moving reference frame based on the signals from the first and second and third inertial sensor.
摘要:
Gearset-drive unit (10), in particular for use in motor vehicles, comprising a drive wheel (16) that meshes with a driven wheel (22), wherein a sensor wheel (26) with a position sensor (36) that interacts with a sensor (42) to detect speed meshes with the drive wheel (16) or the driven wheel (22).
摘要:
A method and system for measuring angular speed of an object uses a micromechanical filter apparatus and allows Q-multiplication in both drive and sense modes. The invention takes advantage of the constant amplitude region of a filter spectrum within a passband of the filter apparatus to sense with a constant scaling factor that is independent of frequency variations with the passband. Thus, the system has much less sensitivity to drive mode resonance frequency shifts due to temperature variations, fabrication non-idealities and aging. The system senses angular rate or speed at resonance, which results in a great improvement over conventional gyroscopes operated off-resonance.
摘要:
This invention describes the addition of mechanical reference members (MRM) to MEMS gyroscopes and accelerometers in order to enable the measurement of their scale factor and bias characteristics. The measurements can be made prior to or during operation of the instruments. This approach is attractive since MEMS devices are subject to drift of these characteristics with time, with the environment and with application conditions. The mechanical reference members are used to provide a rotation rate reference for the gyroscopes and an acceleration reference for the accelerometers.
摘要:
A gyroscope having a rotor mounted onto a rotating shaft wherein the rotor has a circular flange extending from and perpendicular to one surface thereof. A suspension member having a flexible flange is affixed concentric with the rotating shaft and the rotor. A hysteresis synchronous electric drive motor is used for spinning the combined shaft with rotor. A light source is disposed on a stationary plate for emitting light perpendicular to a surface of the circular flange of the rotor. A light sensor is also disposed on the stationary plate and on a side of the circular flange opposite of the light source for producing an electrical signal as a function of the amount of light received. The light source and the light sensor are positioned such that only a portion of the light from the source strikes the sensor when the gyro is in a quiescent rotating state. However, when the rotor is tilted as a function of an angular force applied to the gyroscope, the amount of light received by the sensor varies thereby producing an electrical signal indicative of the angular force.
摘要:
A micro-machined multi-sensor that provides 2-axes of acceleration sensing and 1-axis of angular rate sensing. The multi-sensor includes a rigid accelerometer frame, a first proof mass, and a second proof mass. The substrate has two associated acceleration axes in the plane of the substrate, and one associated rotation axis perpendicular to the acceleration axes. The proof masses have a common vibration axis, which is perpendicular to the rotation axis. The multi-sensor further includes a drive electrode structure for causing the proof masses to vibrate in antiphase, a first pair of acceleration sense electrode structures disposed along one of the acceleration axes, and a second pair of acceleration sense electrode structures disposed along the other acceleration axis. The multi-sensor adds the sense signals provided by the respective sense electrode pairs to extract information pertaining to acceleration sensing along the acceleration axes, and adds the differences of the sense signals provided by the respective sense electrode pairs to extract information pertaining to angular rate sensing relative to the rotation axis.
摘要:
A vibrating structure, including at least two oscillators (1, 2) vibrating in a direction of oscillation (XOX) included in a plane (XOX-YOY), a rigid support (8, 9, 10, 11) of the oscillators and oscillator coupling means able to couple their vibratory movements, these means being connected, on the one hand to the rigid support and on the other hand to the oscillators, each oscillator comprising at least one mass (3) and at least one flexible arm connecting the mass to the coupling means, characterised in that said coupling means. comprise flexible attachment means (19, 20) associated with at least one flexible arm (4) of each oscillator by at least one point of attachment, making at said point of attachment a pivot.
摘要:
An angular velocity sensor is provided that includes a frame, an oscillator and torsion bars that connect the oscillator to the frame. The frame, the oscillator and the torsion bar are formed integral with each other by etching a material substrate in the thickness direction of the substrate. The oscillator, configured in the form of an H, includes a support, two first arms and two second arms. These arms extend from the support in an arm-extending direction perpendicular to the thickness direction of the substrate. The oscillator includes a mounting surface that is provided with a piezoelectric driver for generating in-plane oscillation of the oscillator, and with a piezoelectric detector for detecting out-of-plane oscillation of the oscillator.
摘要:
A suspended, coupled micromachined structure including two proof masses and multiple support arms configured to suspend the masses above a substrate and a coupling spring element having two ends. Each end of the coupling spring element may be attached to a proof mass at a point between the proof masses. The frequency response characteristics of the proof masses may be improved.