OBN system composition

(1) Submarine seismic nodes

Main features:

Connect external underwater acoustic modulator for positioning and data transmission;

Work normally at any Angle;

Advanced self-diagnosis system;

50 days of normal operation;

Charging is completed within 20 hours;

OBN size :400*260*125(145)mm

Weight: 20kg

Technical specifications:

Collector: 4 channels;

Universal type seismometer: BH-20MT-OMNI or GS-ONE OMNI;

Hydrophone: self-made;

ADC resolution: 24 bits;

ADC conversion mode: Delta-Sigma conversion;

Sampling interval: 0.25,0.5,1,2,4ms;

Gain: 0,6,12,18,24,30,36dB;

Maximum input signal: 2500mV(RMS);

Equivalent input noise (2ms,0dB) : 0.87mV;

Dynamic range: 124dB;

Common mode rejection ratio: >90dB;

Cross feed: >110dB;

Total harmonic distortion: <-100dB;

New OCXO tuning system: 3 times faster adjustment;

(2) Control containers

Main functions:

Recharging batteries at seismic nodes on the seabed;

Set parameters for submarine seismic nodes;

Download recorded parameters from the seabed seismic node;

Technical specifications:

Up to 288 submarine seismic nodes are used together;

Different types of power supply (220V,380V,440V) can be charged;

Main features of C-OBN system

The submarine seismic node can be operated on shore and underwater, with a maximum depth of 500 meters;

Complete the repreparation within a maximum of 24 hours;

Operating temperature between -10℃ and +50℃;