Janiaud
Denis Janiaud, Gauguin FR
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20120024060 | ELEMENT VIBRATING IN TWO UNCOUPLED MODES, AND USE IN VIBRATING RATE GYROSCOPE - The present disclosure relates to a vibrating element which is planar parallelly to an electrical crystallographic axis of a piezoelectric material such as quartz. The element comprises a beam holding electrodes, a stationary portion rigidly connected to one end of the beam, and a solid portion rigidly connected to the other end of the beam. The structure with facets from the chemical machining of the element has an axis of symmetry parallel to the electrical axis, and the solid portion has a center of gravity on the axis of symmetry. The useful vibration modes of the vibrating element, according to which the solid portion is reciprocatingly rotated about the axis of symmetry and reciprocatingly moved parallel to the plane of the element, are uncoupled. The measurement of an angular speed by a rate gyroscope including said vibrating elements is more precise. | 02-02-2012 |
Denis Janiaud, Les Ullis FR
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20120279303 | ELECTRODES AND ASSOCIATED ELECTRONIC CIRCUITS FOR A PIEZOELECTRIC VIBRATING GYROMETER - The Coriolis-effect gyrometer has a tuning fork having two tines ( | 11-08-2012 |
Denis Janiaud, Les Ulis FR
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20140016666 | DEVICE FOR MEASURING THE TEMPERATURE OF A VIBRATING BEAM AND APPLICATION TO THE IMPROVEMENT OF THE PRECISION OF MEASUREMENT OF A VIBRATING-BEAM SENSOR - The invention is a device for measuring the temperature of the vibrating beam of a vibrating-beam sensor. It comprises a resonator ( | 01-16-2014 |
Noelle Janiaud, Massy FR
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20140210409 | METHOD FOR CONTROLLING SWITCHES OF A CURRENT RECTIFIER CONNECTED TO AN ON-BOARD CHARGER - A method for controlling switches of a current rectifier installed on a motor vehicle, including: determining a neutral point current intensity required at an output of the rectifier; determining current vector coordinates making it possible to obtain the neutral point current in a Fresnel space including six sectors defined by six remarkable vectors; determining a half-sector including the current vector among twelve half-sectors forming the Fresnel space; determining a weighted vectorial combination of two remarkable vectors defining the Fresnel sector making it possible to obtain the current vector; switching the current rectifier switches to obtain the current vector in accordance with the weighting coefficients; and obtaining a free-wheel vector for remaining time of a cutting period minimizing voltage differences between the ground and the voltage rectifier during transition from one switching to another. | 07-31-2014 |