Pendulum accelerometer

Abstract

The invention discloses a pendulum accelerometer. A meter core of the pendulum accelerometer comprises a silicon pendulum sheet (1), a torquer, an optical displacement sensor and an electromagnetic damper. The torquer comprises magnetic steel (3), a magnetic conductive cap (4) and a torquer coil (5), and the torquer coil (5) is fixed to the lower surface of the silicon pendulum sheet (1) and located in an annular gap among the magnetic conductive cap (4), the magnetic steel (3) and a base (2). A movable light window (10) of the optical displacement sensor is fixed on the silicon pendulum sheet(1) and located between a light source (12) and a photoelectric receiver (11). The electromagnetic damper comprises damper magnetic steel (7), a damper magnetic conductive cap (8) and a damper coil (6), and the damper coil (6) is fixed on the upper surface of the silicon pendulum sheet (1) and located in an annular gap among the damper magnetic steel (7), the damper magnetic conductive cap (8) and an upper cover (9). By combining the optical flexible pendulum accelerometer and the electromagnetic damping technology, acceleration measurement with small dynamic errors under the high dynamic condition is achieved.

Description

technical field [0001] The invention belongs to the technical field of high-precision instruments and meters, and in particular relates to a pendulum accelerometer. Background technique [0002] An accelerometer is an instrument for measuring the linear acceleration of a moving carrier, and is one of the core components of an inertial navigation system. In the field of high-precision inertial navigation, the most widely used accelerometer products are still mainly pendulum accelerometers, which have the advantages of simple structure, small size, long life, high precision and sensitivity, small temperature coefficient, and stable performance. Inertial navigation systems for aircraft, missiles, rockets, ships, and vehicles, as well as inclination measurement for oil drilling, construction, and dams, as well as seismic monitoring and other fields. [0003] In the existing pendulum accelerometer, the pendulum plate and the fixed plate form a differential capacitive displacemen...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned quartz accelerometer adopts the gas in the gap between the capacitor plates to form pressure-film damping, and when the dynamic acceleration signal is input, the oscillation motion of the flexible pendulum is suppressed, but the pressure-film damping torque is usually limited by the gap and area of ​​the plates. The suppression effect of flexible pendulum oscillation is weak in high dynamic environment, so the dynamic error of quartz accelerometer is large in high dynamic environment

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