Angular speed measuring device

Measurement device for measuring an angular speed, comprising:

• a transducer intended to rotate at said angular speed;
• means for producing an exciting signal having a first frequency;
• means for exciting a first vibration of said transducer in response to said exciting signal;
• means for producing a detection signal including at least one component having a amplitude representative of the amplitude of a second vibration of said transducer, said second vibration being coupled to said first vibration and having an amplitude representative of said angular speed;
• and
• means for producing a measurement signal representative of said angular speed in response to said detection signal, including means for producing a signal representative of the phase shift between said exciting signal and said detection signal, said phase-shift being representative of said amplitude of said component of the detection signal, wherein said means for producing a signal representative of said phase-shift include:
• means responsive to said exciting signal for producing a first logic signal having said first frequency and in phase with said exciting signal;
• means responsive to said detection signal for producing a second logic signal in phase with said detection signal;
• means for producing a signal comprising a plurality of periodic pulses having a second frequency grater than said first frequency;
• and
• counting means including a counter and means responsive to one of said logic signals to start the counting of said pulses by said counter and to the other of said logic signals to stop said counting, the outputs of said counter presenting, immediately after said stop, a first number that is equal to the number of said pulses counted by said counter between said start and said stop, and the value of said first number being representative of said phase-shift.