Description

The seismometer has a built-in low-noise, high-performance three-way wide-band seismometer, which is composed of three force-balanced feedback-type displacement transducer pendulums evenly distributed along the circumference. The system can monitor the zero point and tilt angle of the seismometer in real time. When it exceeds the range, it can make adaptive adjustments, including horizontal adjustment, seismometer opening, locking, and zero adjustment.

APPLICATION AREAS

It is suitable for seismic exploration and seismic observation with transmission conditions in shallow seas and islands, which helps to understand the internal structure of the earth; through microseismic observation, it can monitor the occurrence of major earthquakes and serve for earthquake prediction and submarine engineering (such as submarine oil field development); research on large Characteristics of seismic activity and tectonic activity in areas such as ocean ridges, ocean basins, and trenches; investigating the crustal structure of the continent-ocean transition zone to reveal the mechanism of plate subduction, etc.

WORKING PRINCIPLE

The sockets on both sides of the broadband seabed seismometer are connected to the hydrophones, and the middle socket is connected to the shore base station or connection box. The interior consists of a seismometer, a leveling mechanism, an attitude reference unit, an acquisition module, a long-distance communication module, etc. .

The seismometer is a system in which mechanics and electronics are coupled to each other. It adopts a force-balanced electronic-mechanical integrated feedback system to achieve recording requirements of wide frequency band and large dynamic range. When the seabed motion is transmitted to the seismometer frame, the displacement transducer converts the displacement change of the pendulum relative to the frame into a voltage. After amplification, detection, and integration amplification, the signal is generated through the feedback network circuit and is proportional to the ground motion acceleration. The current drives the feedback coil in the enclosed magnet, thereby generating a force that balances the inertial force of the pendulum. The feedback circuit consists of three branches: integral, differential and proportional. The closed-loop transfer function of the seismometer is mainly determined by the feedback network. The signal output of the three-dimensional sensor (UVW) is proportional to the ground motion velocity. After coordinate transformation, the conversion of orthogonal signals (XYZ) is realized.