Thales

Jean-Michel Muguet

Régis Quer

Yann Planchette

The invention relates to vibrating micro-systems, and notably but not exclusively to pressure, acceleration, or angular speed micro-sensors with a resonator in an evacuated cavity. The resonator () with a vibrating element is placed in an oscillating circuit controlled by a closed-loop control, the oscillating circuit supplying an oscillating signal y(t) at a resonance frequency Fp representing the measurement of a physical quantity. The resonance frequency is calculated by counting pulses over a time window. The sensor furthermore comprises means for calculating a continuity parameter Pc representing the variations in the result of the calculation of the resonance frequency over the course of the successive time windows, and means for comparing the parameter Pc with a threshold in order to deduce from this information on the degradation of the precision of the sensor.

Sensor with a vibrating member in a cavity with integrated anomaly detection

The invention relates to a device for neutralizing a signal obtained by modulating, on to a high frequency carrier, a useful signal delivered by a system comprising a parasitic capacitance Cp that varies over time, the device comprising a neutralizing capacitance Cn, means for providing an adjustable gain G, said means being equipped with a JFET field-effect transistor (J) equipped with a gate first electrode and drain and source second electrodes, and a control loop for providing gain G so that G&#xd7;Cn permanently equals Cp by controlling the voltage on the gate first electrode of the transistor (J). The neutralizing capacitance Cn comprises a first capacitor Cneutroand a second capacitor Cneutroplaced in parallel at the output of said means for providing gain G.

Growing community of inventors

Rochefort-Samson, France

Jean-Michel Muguet