WO2015074817A1 - Capteur a element sensible mobile ayant un fonctionnement mixte vibrant et pendulaire, et procedes de commande d'un tel capteur - Google Patents
Capteur a element sensible mobile ayant un fonctionnement mixte vibrant et pendulaire, et procedes de commande d'un tel capteur Download PDFInfo
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- WO2015074817A1 WO2015074817A1 PCT/EP2014/072580 EP2014072580W WO2015074817A1 WO 2015074817 A1 WO2015074817 A1 WO 2015074817A1 EP 2014072580 W EP2014072580 W EP 2014072580W WO 2015074817 A1 WO2015074817 A1 WO 2015074817A1
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Classifications
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- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/097—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by vibratory elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/0802—Details
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
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- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
- G01C19/5642—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces using vibrating bars or beams
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
- G01C19/5642—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces using vibrating bars or beams
- G01C19/5656—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces using vibrating bars or beams the devices involving a micromechanical structure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
- G01C19/5719—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces using planar vibrating masses driven in a translation vibration along an axis
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
- G01C19/5719—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces using planar vibrating masses driven in a translation vibration along an axis
- G01C19/5733—Structural details or topology
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- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/0888—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values for indicating angular acceleration
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- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/097—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by vibratory elements
- G01P15/0975—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by vibratory elements by acoustic surface wave resonators or delay lines
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- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/125—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by capacitive pick-up
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- G01P15/14—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of gyroscopes
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- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/18—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration in two or more dimensions
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- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P2015/0805—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration
- G01P2015/0808—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration for defining in-plane movement of the mass, i.e. movement of the mass in the plane of the substrate
- G01P2015/0811—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration for defining in-plane movement of the mass, i.e. movement of the mass in the plane of the substrate for one single degree of freedom of movement of the mass
- G01P2015/0814—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration for defining in-plane movement of the mass, i.e. movement of the mass in the plane of the substrate for one single degree of freedom of movement of the mass for translational movement of the mass, e.g. shuttle type
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- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P2015/0805—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration
- G01P2015/0808—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration for defining in-plane movement of the mass, i.e. movement of the mass in the plane of the substrate
- G01P2015/082—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration for defining in-plane movement of the mass, i.e. movement of the mass in the plane of the substrate for two degrees of freedom of movement of a single mass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P2015/0805—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration
- G01P2015/0848—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration using a plurality of mechanically coupled spring-mass systems, the sensitive direction of each system being different
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P2015/0805—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration
- G01P2015/0857—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration using a particular shape of the suspension spring
Definitions
- the present invention relates to a sensor that can be used for detecting an acceleration, a pressure or more generally any physical quantity whose variation can cause the displacement of a movable body with respect to a frame.
- the invention is more particularly applicable in application to an acceleration inertial sensor and in particular a MEMS type sensor.
- a vibrating resonator acceleration sensor generally comprises a seismic body (or test mass) connected to a support by a vibrating element generally in the form of a beam extending along a sensitive axis of the sensor.
- the sensor includes transducers for vibrating the beam at the resonance frequency of the beam and for detecting changes in the vibration frequency of the beam.
- the seismic body exerts on the beam an axial force of compression or traction: this results in a modification of the stiffness of the beam and therefore a change in its resonant frequency.
- the acceleration measurement is thus deduced from a small variation in the natural frequency of the beam from which a relatively large measurement bias results.
- Ef ⁇ fet under the effect of acceleration, a force is applied to the resonator and modifies the resonance frequency thereof: the resulting deformation is relatively low and is similar to the parasitic deformations caused by temperature variations or relaxation of stresses in assemblies.
- the measurements are carried out in differential mode. replacing the single beam by two tuning fork beams under opposite sign constraints applied either by a seismic body common to the two beams or by two seismic bodies each connected to one of the beams.
- the electrostatic rai ⁇ is obtained by means of comb electrodes attached to each of the vibrating beams of a tuning fork so that, under the effect of an acceleration ⁇ ration, the body test modifies the gap of the comb electrodes and therefore the electrostatic stiffness generated by said electrodes.
- the modification of the stiffness causes a modification of the vibration frequencies of the beams.
- the beams have different vibration frequencies and the difference between the two frequencies is the measure of the acceleration.
- An object of the invention is to provide a means for further improving the performance of the sensors.
- a sensor comprising: a frame; a first body connected to the frame to be movable along a sensitive axis by first suspension means defining a suspension plane; two resonators which are arranged symmetrically with respect to the first body along the sensitive axis and which each comprise a pair of second bodies, each connected to the frame by second suspension means to be movable along an axis of vibration substantially perpendicular to the sensitive axis and to each other by third suspension means; transducer members connected to a control unit for detec ⁇ ter a position of the first body relative to the frame, vibrating the second bodies along the vibration axis and detecting a vibration frequency of the second bodies; and surface electrostatic coupling means connecting each second body to the first body such that a displacement of the first body relative to the frame along the sensitive axis causes acc ⁇ increase of the electrostatic coupling for one of the pairs of second bodies and a decrease in electrostatic coupling for the other pairs of second bodies.
- these resonators have a modal mass and overvoltage relatively large, and a relatively low resonance frequency.
- the first body moves under the effect of an external stress, it causes an increase in stiffness
- Obtaining the variation of the electrostatic stiffness by a displacement also renders the sensor less sensitive to the temperature or to the relaxation of the assembly stresses than if this variation resulted from the application of a force.
- the arrangement of the sensor with a first single body, the displacement of which causes a variation of the vibration frequency of the resonators, makes it possible to have a single input while at the same time having a relatively large test mass for each of the two resonators.
- This arrangement also makes it possible to have surface electrostatic coupling means, that is to say that the displacement of the first body will cause a surface variation causing a variation of the electrostatic coupling, this variation being more linear to the first order than va ⁇ riation gap and therefore more easily exploitable. This results in an improvement of the cap ⁇ tor performance.
- Measuring the displacement of the first body is EGA ⁇ LEMENT representative of the external stress.
- the sensor according to the invention incorporates in this way a pendular operating mode and a vibrating mode of operation, which can in particular allow measurement redundancy.
- the sensor according to the invention thus has an additional functionality provided by the first body in combination with the transducers that allow the open-loop pendular mode of operation capable of providing measurements to further improve the performance of the sensor.
- the invention also relates to a first method of controlling such a sensor.
- This method includes the step of detecting a displacement of the first body to determine a first measurement value, and the step of detecting a change in the frequency of the resonators to determine a second measurement value.
- the method comprises the step of retaining as final measurement value an average of the first measurement value and the second measurement value.
- the invention further relates to a second method of controlling a sensor.
- This process comprises the step of causing a predetermined movement of the first body and the step of processing a signal from the transducer members of the resonators to determine a measurement value.
- FIG. 1 is a schematic top view of a sensor according to the invention.
- FIG. 2 is an enlarged detail view of zone II of FIG.
- the sensor of the invention is of the MEMS type here and is manufactured by wafer etching comprising at least one semiconductor layer and an electrically conductive layer separated by an electrically insulating layer (so-called SOI wafers for "Silicon On”). Insulator "). This method of manufacture is known in itself.
- the sensor according to the invention comprises a frame generally designated at 1.
- the frame 1 comprises a lateral wall 2 in the form of a rectangular frame surmounting a bottom 3.
- the suspension means 5 define a suspension plane P and are arranged to that the body 4 is movable along a sensitive axis X tale ⁇ nu in the suspension plane P.
- the body 4 has the shape of a rectangular plate in which are formed two cavities 6.1, 6.2, of rectangular shape, which are aligned with respect to each other on the sensitive axis X and which are separated one by one. on the other by a portion 7.
- Two resonators generally designated 10.1, 10.2 are each received in one of the cavities 6.1, 6.2 and are therefore arranged symmetrically with respect to the seismic body 4 along the sensitive axis X.
- Each resonator 10.1, 10.2 comprises a pair of second bodies 11.1, 12.1, 11.2, 12.2, each connected to the bottom 3 of the frame 1 by second suspension means 13.1, 13.2.
- the second suspension means 13.1, 13.2 are arranged so that each of the bodies 11.1, 12.1, 11.2, 12.2 can vibrate along a vibration axis Y1, Y2 substantially perpendicular to the sensitive axis X.
- the bodies 11.1, 12.1 are connected to one another by means of third suspension means 14.1.
- the bodies 11.2, 12.2 are connected to each other by third suspension means 14.2.
- the bodies and the suspension means are arranged in such a way that the body 4 and the suspension means 5 have a natural frequency of the order of about 1 kHz to about 3 kHz, and the resonators 10.1 and 10.2 have a higher natural frequency here between 10 kHz and approximately 20 kHz.
- the suspension means are formed of elastically deformable lamellae parallel to the suspension plane P, but which have a high stiffness along the axis normal to the suspension plane P to suppress the degrees of freedom of the bodies outside the suspension plane P.
- the third suspension means 14.1, 14.2 comprise elastically deformable blades 15 arranged in a rhombus having a first diagonal which is parallel to the vibration axis Y and which is defined by first vertices connected to the bodies 11.1, 12.1 and a second diagonal which is parallel to the sensitive axis and which is defined by second vertices connected to the bottom 3 of the body 1 by sipes 16 forming links such my ⁇ niere that the second peaks are movable only along the sensitive axis X.
- the sensor comprises transducer elements re ⁇ linked to a control unit 8.
- First transducer means 9 are mounted between the side wall 2 of the frame 1 and the first body 4 and are arranged in a manner known in itself, for ⁇ detect a position of the first body 4 relative to the ba ⁇ t 1 and to move the first body 4 relative to the frame 1.
- the same transducer members can be controlled to perform alternately these two functions, or a transducer member can be dedicated to the displacement function and a transducer member can be dedicated to the detection function .
- Second transducer members 17.1, 17.2 are mounted between each of the second bodies 11.1, 12.1, 11.2, 12.2 the bottom 3 of the frame 1 and are arranged, in a manner known per se, for vibrating the second bodies 11.1, 12.1, 11.2, 12.2 along the vibrating axis Y1, Y.2 and detecting a vibration frequency of the second bodies 11.1, 12.1, 11.2, 12.2.
- the same transducer members can be controlled to perform alternately these two functions, or a transducer member can be dedicated to the vibration setting function and a transducer member can be dedicated to the detection function.
- the transducer members are in the form of comb electrodes.
- the sensor further comprises surface electrostatic coupling means connecting each second body 11.1, 12.1, 11.2, 12.2 to the first body 4 such that a displacement of the first body 4 relative to the frame 1 along the sensitive axis X causes an increase in the electrostatic coupling for one of the pairs of second bodies 11.1 , 12.1, 11.2, 12.2 and a decrease in the electrostatic coupling for the other pairs of second bodies 11.1, 12.1, 11.2, 12.2.
- the means of surface electrostatic coupling 18.1, 18.2 are mounted between said portion 7 and deu ⁇ XIth body 11.1, 12.1, 11.2, 12.2 and have the shape of electrodes combs whose teeth extend paral ⁇ the element to the axis X.
- Each of the second bodies 11.1, 12.1, 11.2, 12.2 is thus provided with a comb elec ⁇ trodes and the portion 7 also comprises a comb electrode opposite each comb electrode of the second bodies 11.1, 12.1 , 11.2, 12.2 so that the teeth of the facing electrodes are interposed between each other.
- the electrodes of the transducers and the electrodes of the electrostatic coupling means are con ⁇ connected to at least one voltage source by connection means which are controlled by the control unit 8 to selectively energize said electrodes.
- connection means which are controlled by the control unit 8 to selectively energize said electrodes.
- the control unit 8 comprises, in a manner known in itself, a memory containing a computer program and a processor arranged to execute said ⁇ gram. This program allows the implementation of control methods of the sensor.
- the invention also relates to proce ⁇ control this sensor fixed for example in a vehicle with other sensors to provide measurements to a navigation central control unit or a central control of the vehicle.
- a first of these methods comprises the steps of:
- the first value is obtained by using the sensor as a pendulum accelerometer and the second value is obtained by using the sensor as a vibrating accelerometer.
- the method then comprises the step of retaining as an acceleration value an average of the first acceleration value and the second acceleration value. It should be noted that this average can be calculated by weighting in advance the first and second acceleration values.
- the weighting coefficients can be set once and for all, for example during a factory calibration step to take into account the relative performance of the sensor in pendulum mode and the sensor in vibrating mode or may vary according to environmental parameters such as temperature .
- a temperature sensor connected to the control unit 8 is then disposed in the vicinity of the sensor and the control unit 8 comprises a memory containing values of the coefficients as a function of the temperature.
- the invention also relates to a second method for controlling this sensor, which makes it possible to carry out a test or calibration of the sensor.
- This process comprises the steps of:
- the control unit 8 is programmed to calculate this theoretical value of acceleration and to compare it with the value of acceleration determined from the signal actually supplied by the second transducer members 17.1, 17.2. This makes it possible to check the integrity of the sensor and in particular the efficiency of the transducers and the mobility of the body 4.
- the control unit 8 is preferably arranged to determine, as a function of the difference between the two values, a corrective factor to be applied to the acceleration value determined from the signals supplied by the second transducer members 17.1, 17.2.
- the control unit 8 is also arranged to use the result of the comparison to update an error model of the sensor. As a variant, the result of the comparison is used to adjust the voltages applied to the different electrodes of the sensor so as to minimize the difference noted.
- the control unit 8 is advantageously programmed to implement this calibration or test method periodically.
- the control unit 8 can also be arranged to control the first transducer members 9 so as to filter out disturbances (such as vi ⁇ bations generated by the sensor holder) and to realize for example an active suspension achieving a controlled damping of the first clean mode of the first body 4.
- disturbances such as vi ⁇ bations generated by the sensor holder
- the first body may have other shape than that described and for example the shape of a plate in which is formed a single cavity to accommodate the two resonators.
- the sensor of the invention is usable for the detection of any magnitude that can be translated into a displacement of the first body relative to the frame, such as acceleration, pressure or other.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Gyroscopes (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201480073565.0A CN105917242B (zh) | 2013-11-20 | 2014-10-21 | 利用具有混合振动和摆动操作的移动敏感元件的传感器以及控制这样的传感器的方法 |
EP14793472.3A EP3071976B1 (fr) | 2013-11-20 | 2014-10-21 | Capteur a element sensible mobile ayant un fonctionnement mixte vibrant et pendulaire, et procedes de commande d'un tel capteur |
US15/037,518 US9519004B2 (en) | 2013-11-20 | 2014-10-21 | Sensor with moving sensitive element having mixed vibrating and pendular operation, and methods for controlling such a sensor |
RU2016124250A RU2632264C1 (ru) | 2013-11-20 | 2014-10-21 | Датчик с подвижным чувствительным элементом, работающим в смешанном вибрирующем и маятниковом режиме, и способы управления таким датчиком |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1361433A FR3013445B1 (fr) | 2013-11-20 | 2013-11-20 | Capteur a element sensible mobile ayant un fonctionnement mixte vibrant et pendulaire, et procedes de commande d'un tel capteur |
FR1361433 | 2013-11-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015074817A1 true WO2015074817A1 (fr) | 2015-05-28 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2014/072580 WO2015074817A1 (fr) | 2013-11-20 | 2014-10-21 | Capteur a element sensible mobile ayant un fonctionnement mixte vibrant et pendulaire, et procedes de commande d'un tel capteur |
Country Status (6)
Country | Link |
---|---|
US (1) | US9519004B2 (fr) |
EP (1) | EP3071976B1 (fr) |
CN (1) | CN105917242B (fr) |
FR (1) | FR3013445B1 (fr) |
RU (1) | RU2632264C1 (fr) |
WO (1) | WO2015074817A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6485260B2 (ja) * | 2015-07-10 | 2019-03-20 | セイコーエプソン株式会社 | 物理量センサー、物理量センサー装置、電子機器および移動体 |
WO2017051243A1 (fr) * | 2015-09-25 | 2017-03-30 | Murata Manufacturing Co., Ltd. | Accéléromètre microélectromécanique amélioré |
US10466053B2 (en) * | 2017-04-04 | 2019-11-05 | Invensense, Inc. | Out-of-plane sensing gyroscope robust to external acceleration and rotation |
FR3065800B1 (fr) * | 2017-04-27 | 2019-08-02 | Safran | Resonateur configure pour etre integre a un capteur angulaire inertiel |
US10866258B2 (en) * | 2018-07-20 | 2020-12-15 | Honeywell International Inc. | In-plane translational vibrating beam accelerometer with mechanical isolation and 4-fold symmetry |
FR3102855B1 (fr) * | 2019-11-06 | 2021-12-03 | Commissariat Energie Atomique | Accelerometre performant presentant un encombrement reduit |
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EP2339293A1 (fr) * | 2009-12-24 | 2011-06-29 | STMicroelectronics Srl | Gyroscope micromécanique intégré doté d'une structure d'entraînement améliorée |
FR2983574A1 (fr) * | 2011-12-06 | 2013-06-07 | Sagem Defense Securite | Capteur angulaire inertiel de type mems equilibre et procede d'equilibrage d'un tel capteur |
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US6122961A (en) * | 1997-09-02 | 2000-09-26 | Analog Devices, Inc. | Micromachined gyros |
US6230563B1 (en) * | 1998-06-09 | 2001-05-15 | Integrated Micro Instruments, Inc. | Dual-mass vibratory rate gyroscope with suppressed translational acceleration response and quadrature-error correction capability |
US6470748B1 (en) * | 1999-10-13 | 2002-10-29 | Analog Devices, Inc. | Feedback mechanism for rate gyroscopes |
JP3870895B2 (ja) * | 2002-01-10 | 2007-01-24 | 株式会社村田製作所 | 角速度センサ |
KR100476562B1 (ko) * | 2002-12-24 | 2005-03-17 | 삼성전기주식회사 | 수평형 및 튜닝 포크형 진동식 마이크로 자이로스코프 |
JP4433747B2 (ja) * | 2003-09-29 | 2010-03-17 | 株式会社村田製作所 | 角速度検出装置 |
US7377167B2 (en) * | 2004-02-27 | 2008-05-27 | The Regents Of The University Of California | Nonresonant micromachined gyroscopes with structural mode-decoupling |
KR100616641B1 (ko) * | 2004-12-03 | 2006-08-28 | 삼성전기주식회사 | 튜닝포크형 진동식 mems 자이로스코프 |
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US8113050B2 (en) * | 2006-01-25 | 2012-02-14 | The Regents Of The University Of California | Robust six degree-of-freedom micromachined gyroscope with anti-phase drive scheme and method of operation of the same |
DE102007030119A1 (de) * | 2007-06-29 | 2009-01-02 | Litef Gmbh | Corioliskreisel |
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US8322213B2 (en) * | 2009-06-12 | 2012-12-04 | The Regents Of The University Of California | Micromachined tuning fork gyroscopes with ultra-high sensitivity and shock rejection |
RU2436106C2 (ru) * | 2010-02-24 | 2011-12-10 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") | Частотный датчик линейных ускорений |
ITTO20110782A1 (it) * | 2011-08-31 | 2013-03-01 | Milano Politecnico | Struttura di rilevamento perfezionata per un accelerometro risonante ad asse z |
FR3000194B1 (fr) * | 2012-12-24 | 2015-03-13 | Commissariat Energie Atomique | Gyroscope a calibration simplifiee et procede de calibration simplifie d'un gyroscope |
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2013
- 2013-11-20 FR FR1361433A patent/FR3013445B1/fr not_active Expired - Fee Related
-
2014
- 2014-10-21 WO PCT/EP2014/072580 patent/WO2015074817A1/fr active Application Filing
- 2014-10-21 US US15/037,518 patent/US9519004B2/en active Active
- 2014-10-21 CN CN201480073565.0A patent/CN105917242B/zh active Active
- 2014-10-21 RU RU2016124250A patent/RU2632264C1/ru active
- 2014-10-21 EP EP14793472.3A patent/EP3071976B1/fr active Active
Patent Citations (3)
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US20110079079A1 (en) * | 2009-10-07 | 2011-04-07 | Johannes Classen | Yaw rate sensor, yaw rate sensor system, and method for operating a yaw rate sensor |
EP2339293A1 (fr) * | 2009-12-24 | 2011-06-29 | STMicroelectronics Srl | Gyroscope micromécanique intégré doté d'une structure d'entraînement améliorée |
FR2983574A1 (fr) * | 2011-12-06 | 2013-06-07 | Sagem Defense Securite | Capteur angulaire inertiel de type mems equilibre et procede d'equilibrage d'un tel capteur |
Also Published As
Publication number | Publication date |
---|---|
US9519004B2 (en) | 2016-12-13 |
RU2632264C1 (ru) | 2017-10-03 |
US20160282382A1 (en) | 2016-09-29 |
CN105917242A (zh) | 2016-08-31 |
FR3013445A1 (fr) | 2015-05-22 |
EP3071976B1 (fr) | 2017-09-13 |
FR3013445B1 (fr) | 2015-11-20 |
CN105917242B (zh) | 2018-03-02 |
EP3071976A1 (fr) | 2016-09-28 |
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