摘要:
An acceleration sensor includes a driver circuit for outputting a biased alternating-current (AC) voltage having a variable bias voltage, a detector element having a capacitance provided between a fixed electrode and a movable electrode changing depending on acceleration applied to the detector element, a current-voltage (C/V) converter for converting a current output from the movable electrode of the detector element into a voltage and outputting the voltage, a first operational amplifier outputting a voltage depending on the input voltage, a synchronous demodulator for synchronously detecting the voltage output from the first operational amplifier, and a defect detector for outputting a defect detection signal when the defect detector determines that the voltage output from the first operational amplifier is out of a predetermined range while the biased AC voltage output from the driver circuit is a predetermined voltage. This acceleration sensor can have a small size.
摘要:
In some examples, the disclosure describes an accelerometer having improved hysteresis effects, the accelerometer including a proof mass assembly including a proof mass, a support structure, and a flexure flexibly connecting the proof mass to the support structure to allow the proof mass to move about the plane defined by the support structure. Some examples may include at least one thin film lead including an electrically conductive material on the flexure, where the at least one thin film lead provides an electrical connection between an electrical component on the support structure and an electrical component on the proof mass, and where the at least one thin film lead comprises at least one of a yield strength greater than pure gold or a thermal expansion coefficient less than pure gold.
摘要:
An acceleration sensor includes a driver circuit for outputting a biased alternating-current (AC) voltage having a variable bias voltage, a detector element having a capacitance provided between a fixed electrode and a movable electrode changing depending on acceleration applied to the detector element, a current-voltage (C/V) converter for converting a current output from the movable electrode of the detector element into a voltage and outputting the voltage, a first operational amplifier outputting a voltage depending on the input voltage, a synchronous demodulator for synchronously detecting the voltage output from the first operational amplifier, and a defect detector for outputting a defect detection signal when the defect detector determines that the voltage output from the first operational amplifier is out of a predetermined range while the biased AC voltage output from the driver circuit is a predetermined voltage. This acceleration sensor can have a small size.
摘要:
A planar inertial sensor (1), comprising a first region and a second region (3, 2) of semiconductor material, the second region (2) being capacitively coupled and being mobile with respect to the first region (3), which is fixed. The second region (2) extends in a plane and has second portions (4), which face respective first portions (11) of the first region (3) and are mobile with respect to these so as to modify the distance between them the second region (2) translate with respect to the first region (3) in any direction belonging to the plane of the second region (2).
摘要:
A MEMS sensor includes a movable element positioned in spaced apart relationship above a surface of a substrate and a single centrally located suspension anchor formed on the surface of the substrate. First and second rigid beams are coupled to opposing sides of the suspension anchor and are suspended above the surface of the substrate. A first torsion spring is interconnected between the movable element and the first rigid beam, and a second torsion spring is interconnected between the movable element and the first rigid beam. The rigid beams and the torsion springs are stiff in a lateral direction relative to the surface of the substrate so as to limit slide displacement of the movable element under the condition of a multi-directional overload situation.
摘要:
Piezoresistive detection resonant device comprising a substrate (4), a mobile part (2) configured to move with respect the substrate (4), suspension means (6) suspending the mobile part (2) to the substrate (4), a piezoresistive detection device (10) to detect the motions of the mobile part (2), said piezoresistive detection device (10) comprising at least one strain gauge (12), wherein the piezoresistive detection resonant device also comprises a folded spring (20) with at least two spring arms, connected to the mobile part (2) and configured to be deformed by the motion of the mobile part (2), the at least one gauge (12) being suspended between the substrate (4) and the folded spring (20) in such manner that the deformation of the gauge is reduced compared to the motion of the mobile part.
摘要:
The invention relates to a sensor comprising: a frame; a first body moving along a sensitive axis; two pairs of second bodies positioned symmetrically relative to the first body along the sensitive axis; transducers for detecting a position of the first body relative to the frame, vibrating the second bodies along a vibration axis, and detecting a vibration frequency of the second bodies; and means for surface electrostatic coupling connecting each second body to the first body such that a movement of the first body relative to the frame along the sensitive axis respectively causes an increase and a decrease in the electrostatic torque for one and the other of the pairs of second bodies. The invention also relates to methods for controlling such a sensor.
摘要:
A technique is provided for determining a force/acceleration acting on a proof mass of a bistable device. According to a first aspect of the invention, the location of a boundary of one of the stable configurations of the device is monitored and compared to a predetermined location of the same boundary corresponding to a condition in which the force/ acceleration is absent, to detect a deviation of said location. The deviation is used to determine the force/acceleration. According to another aspect of the invention, the resonance frequency of the proof mass oscillation in one of the stable regions is monitored, and compared to a predetermined resonance frequency of the proof mass oscillation in the same region corresponding to a condition in which the force/acceleration is absent, to determine a deviation of the resonance frequency due to the presence of force/acceleration. The deviation in the resonance frequency is used to determine the force/acceleration.