actuating motion detection device for detecting rotational motion of gyrolasers

• Main Author: LOIL ERIC
• Format: Patent
• Language: English
• Published: 24.12.2002
• Edition: 7
• Subjects: GYROSCOPIC INSTRUMENTS; MEASURING; MEASURING DISTANCES, LEVELS OR BEARINGS; NAVIGATION; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; SURVEYING; TESTING

An actuating motion detection device for a mechanically actuated gyrolaser including at least one fastening ring coaxial with an actuation axis of the gyrolaser. The fastening ring includes a hub held at a center of a rim by radial flexible strips distributed about the hub, and the radial flexible strips are configured to act as springs and to vibrate under an actuating motion. The motion detecting device includes torsion detectors having a pair of piezoelectric plates disposed at a radial position along one radial flexible strip. The piezoelectric plates have respective remanent magnetic fields aligned in opposite directions, and each piezoelectric plate has two electrodes positioned on opposite sides of the piezoelectric plate with one of the two electrodes contacting the radial flexible strip. The electrodes are connected to a common output. In response to deformations of the flexible strips due to rotational motions along the actuation axis, the torsion detectors generate electrical signals of a same polarity that collect at the common output. In response to deformations of the flexible strips coming from motions not along the actuation axis, the torsion detectors generate electrical signals that cancel at the common output.