Vibrating sensor with hybridisation unit
An inertial rotation sensor comprising a vibratory resonator ( 1 ) associated with at least two first transducers ( 2.1 ) connected to a first electronic processor unit ( 5 ) via an electronic multiplexer member ( 6 ) in order to operate successively in a motor mode and in a detection mode and in order to supply a first detection signal. The vibratory resonator ( 1 ) is associated with at least two second transducers ( 2.2 ) that are connected via two load amplifiers ( 3.1 ), two anti-aliasing filters ( 3.2 ), and two ADCs ( 3.3 ) to a second electronic processor unit ( 4 ) in order to operate in detection mode and to supply a second detection signal. The sensor includes an electronic hybridizing unit ( 20 ) for forming a third detection signal from the first and second detection signals.
1. An inertial rotation sensor comprising a vibratory resonator associated with at least two first transducers connected to a first electronic processor unit via an electronic multiplexer member in order to operate successively in a motor mode and in a detection mode and in order to supply at least one first detection signal, the sensor being characterized in that the vibratory resonator is associated with at least two second transducers that are connected via two load amplifiers and two ADCs to a second electronic processor unit in order to operate continuously in detection mode and to supply at least one second detection signal, and in that the sensor includes an electronic hybridizing unit for forming a third detection signal from the first and second detection signals.
2. The sensor according to claim 1 , wherein the electronic hybridizing unit comprises:
a lowpass filter having an input connected to the first processor unit in order to receive the first detection signal and an output connected to a first input of a summing circuit having an output supplying the third detection signal; and
a highpass filter having an input connected to the second processor unit in order to receive the second detection signal and an output connected to a second input of the summing circuit.
3. The sensor according to claim 2 , wherein the lowpass filter and the highpass filter have transfer functions that are complementary.
4. The sensor according to claim 1 , wherein each first transducer comprises two pairs of electrodes facing each other, the pairs being diametrically opposite from each other, and each a second transducer comprises two pairs of electrodes facing each other, the pairs being diametrically opposite each other.
5. The sensor according to claim 1 , wherein the two second transducers are connected to the second electronic processor unit via the two load amplifiers, via two anti-aliasing filters, and via the two ADCs.
6. The sensor according to claim 1 , wherein the vibratory resonator is bell-shaped, having a plane annular edge carrying at least one electrode extending facing electrodes that are secured to a carrier structure in order to form the first transducers and the second transducers.
7. The sensor according to claim 6 , comprising two first transducers that are modally orthogonal and two second transducers that are modally orthogonal, each being formed by two pairs of electrodes.
8. The sensor according to claim 6 , comprising four first transducers forming two groups are transducers that are modally orthogonal and four second transducers forming two groups are transducers that are modally orthogonal, each transducer being formed by two pairs of electrodes.
9. The sensor according to claim 1 , wherein after analog-to-digital conversion, each first transducer delivers a first detection signal, and after analog-to-digital-to-digital conversion, each second transducer delivers a second detection signal, and the electronic hybridizing unit uses the first and second detection signals to form the third detection signal.