Novel bell-shaped vibrator type angular rate gyro

A bell-shaped vibrator type angular rate gyro comprising a bell-shaped vibrator, a vibrator fixing shaft, a vibrator base, an airtight hood, a housing and a circuit system, wherein the bell-shaped vibrator has a nonuniform thickness, axially symmetric and multi curved surface combined structure and comprises:

• a bell shoulder having a hemispheric shell structure;
• a bell waist having a cylindrical shell structure;
• and
• a bell lip having a hyperboloidal shell structure.

The bell-shaped vibrator type angular rate gyro according to claim 10, characterized in that

• negative pole faces of the two excitation electrodes, the two feedback electrodes, the two detection electrodes and the two damp control electrodes are fixedly attached to the bell-shaped vibrator by means of a conductive adhesive,
• positive pole faces thereof are connected with metal leading wire which are bonded to respective connecting holes in the vibrator base by welding,
• eight pairs of capacitor pole plates are connected to respective connecting holes above a central shaft of the vibrator, and
• the bell-shaped vibrator type angular rate gyro which has been assembled is sealed by the airtight hood, connected to an external circuit via connecting terminals, and connected to an integral housing via a mechanical mounting hole.

A method for controlling a bell-shaped vibrator in a piezoelectric manner, wherein the bell-shaped vibrator has a nonuniform thickness, axially symmetric and multi curved surface combined structure and comprises:

• a bell shoulder having a hemispheric shell structure;
• a bell waist having a cylindrical shell structure;
• and
• a bell lip having a hyperboloidal shell structure,
• two excitation electrodes, two feedback electrodes, two detection electrodes and two damp control electrodes are evenly distributed circumferentially on an outer wall of the bell waist of the bell-shaped vibrator, and the two excitation electrodes, the two feedback electrodes, the two detection electrodes and the two damp control electrodes are distributed symmetrically about an axis of the bell-shaped vibrator respectively,
• the method for controlling the bell-shaped vibrator in the piezoelectric manner comprises:
• exciting the bell-shaped vibrator to produce four-wave loop vibration using the two excitation electrodes on the outer wall of the vibrator;
• when an applied angular rate causes a counterclockwise rotation around the symmetrical axis of the bell-shaped vibrator, causing a standing wave to precess in a reverse direction so as to form a precession angle;
• and
• detecting vibrating effect of the standing wave through the two feedback electrodes and the two detection electrodes on the outer wall of the bell-shaped vibrator using piezoelectric effect so as to realize control of the vibration forms of the vibrator.

A method for measuring an angular rate, comprising:

• controlling a bell-shaped vibrator type angular rate gyro in a piezoelectric manner, wherein the bell-shaped vibrator type angular rate gyro comprises a bell-shaped vibrator, a vibrator fixing shaft, a vibrator base, an airtight hood, a housing and a circuit system,
• the bell-shaped vibrator has a nonuniform thickness, axially symmetric and multi curved surface combined structure and comprises:
• a bell shoulder having a hemispheric shell structure;
• a bell waist having a cylindrical shell structure;
• and
• a bell lip having a hyperboloidal shell structure,
• two excitation electrodes, two feedback electrodes, two detection electrodes and two damp control electrodes are evenly distributed circumferentially on an outer wall of the bell waist of the bell-shaped vibrator, and the two excitation electrodes, the two feedback electrodes, the two detection electrodes and the two damp control electrodes are distributed symmetrically about an axis of the bell-shaped vibrator respectively,
• negative pole faces of the two excitation electrodes, the two feedback electrodes, the two detection electrodes and the two damp control electrodes are fixedly attached to the bell-shaped vibrator by means of a conductive adhesive,
• positive pole faces thereof are connected with metal leading wire which are bonded to respective connecting holes in the vibrator base by welding,
• eight pairs of capacitor pole plates are connected to respective connecting holes above a central shaft of the vibrator,
• the bell-shaped vibrator type angular rate gyro which has been assembled is sealed by the airtight hood, connected to an external circuit via connecting terminals, and connected to an integral housing via a mechanical mounting hole;
• exciting the bell-shaped vibrator to produce four-wave loop vibration using the two excitation electrodes on the outer wall of the vibrator;
• when an applied angular rate causes a counterclockwise rotation around a symmetric axis of the bell-shaped vibrator, causing a standing wave to precess in a reverse direction so as to form a precession angle;
• detecting vibrating effect of the standing wave through the two feedback electrodes and the two detection electrodes on the outer wall of the bell-shaped vibrator using piezoelectric effect so as to realize control of the vibration forms of the vibrator;
• and
• causing mass points in planes of capacitor pole plates to produce a displacement by the precession of the standing wave, thus causing capacitor pole plates on an inner wall of the bell-shaped vibrator to change, and detecting the displacement using the eight pairs of capacitor pole plates together to obtain the applied angular rate based on a linear relationship between the displacement and the applied angular rate.