The multi-channel data acquisition is based on the low-power design of the ARM9 processor and the Linux operating system. It has powerful data storage management and self-maintenance capabilities. It can monitor the zero point and tilt angle of the seismometer in real time. When it exceeds the range, it will automatically adapt. Adjustments include horizontal adjustment, seismometer opening, locking, zeroing, etc.

APPLICATION AREAS

It is suitable for shallow sea buried seismic exploration and seismic observation, which helps to understand the internal structure of the earth; through microseismic observation, it monitors the occurrence of major earthquakes and serves earthquake prediction and submarine engineering (such as submarine oil field development); it studies ocean ridges, basins, Characteristics of seismic activity and tectonic activity in areas such as ocean trenches; investigating the crustal structure of the continent-ocean transition zone and revealing the mechanism of plate subduction, etc.

WORKING PRINCIPLE

Select an appropriate sea area as a submarine vibration monitoring point.

Complete charging of the lithium battery pack in advance.

Start up and complete the timing of the seismograph.

Install the seabed seismometer into the deployment equipment, and the deployment equipment will install the seabed seismometer 100-200mm into the seabed.

After the seismometer is installed, the internal leveling mechanism (coarse adjustment) is automatically started.

After the seismometer is leveled, open the pendulum (open pendulum), adjust the zero point (fine adjustment), the seismometer starts to work, and the data collector enters the working state, continuously collects and stores the seismometer output (if the seismometer has open pendulum, adjustment zero function).

When it is necessary to obtain recorded data, the seismometer is retrieved through recovery equipment.

Extract the observation data recorded by the data collector for analysis and scientific research.

The post GEO-OBS60-B: BURIED BROADBAND SEABED SEISMOMETER appeared first on QuakeLogic.

The sinking and floating broadband seabed seismometer was used in the marine seismic station construction project of the “Digital Seismic Observation Network” project of the China Earthquake Administration around 2006. It has been tested many times in the sea area south of Zhuhai and has been successfully used in China. Deep-sea observation experiments were conducted in the South China Sea and achieved success.

WORKING PRINCIPLE

The working process of the sinking and floating broadband seabed seismometer is to select an appropriate sea area and drop the sinking and floating broadband seabed seismometer and the sinking coupling frame is much greater than that in seawater. buoyancy , so it will sink to the seabed. After sinking to the seabed, the internal gimbal will be automatically activated for leveling. After the leveling is completed, the seismometer will start to work, and the data collector will also enter working state and start continuous collection and recording. Seismometer output. When it is necessary to obtain recorded data, the sinking and floating broadband seabed seismometer must be recovered. A release command can be sent through sonar. The sinking and floating wide-band seabed seismometer receives the hydroacoustic release command and starts the release mechanism to separate the sinking coupling frame from the recovery part of the sinking and floating wide-band seabed . The sinking and floating wide-band seabed seismometer Since the buoyancy of the instrument recovery part is greater than its own gravity, it will float to the sea surface, and the GPS positioning information will be sent out by the digital radio station. Then the position of the instrument will be determined based on this information and the instrument will be salvaged. Then the observation data recorded by the data collector will be extracted for analysis and scientific analysis. Research.

The post GEO-OBS60/120F: FLOATING AND SINKING BROADBAND SEABED SEISMOMETER appeared first on QuakeLogic.

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.

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