OBEM Ocean Bottom Electromagnetic Meter

OBEM Ocean Bottom Electromagnetic Meter
OBEM Ocean Bottom Electromagnetic Meter
OBEM Ocean Bottom Electromagnetic Meter
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Ocean bottom electromagnetic meters are a kind of marine geophysical observation and exploration instrument that is used to receive and record ocean bottom electromagnetic signal. According to the equipped sensors, ocean bottom electromagnetic meters can be divided into ocean bottom electrical meter (OBE), ocean bottom magnetic meter (OBM) and ocean bottom electromagnetic meter (OBEM). As an advanced high-tech ocean seismic observation product developed in recent years, ocean bottom electromagnetic meters are widely used for marine survey, marine resource exploration, ocean bottom structure research and disaster prevention and mitigation, becoming one of the key instruments of marine geophysical survey and a new highlight and growth point in marine geophysical instrument and observation technology.

Application

There are internal small low frequency fluxgate sensors and filling electric sensors inside OBEM. OBEM can be used for sea bottom and artificial magnetotelluric sounding.

Specification
Volume 600×600×700 mm
Deployment volume (seismic anchor included) 900×900×1000 mm
Electrode extend length 5 m
Deployment depth limit 6000 m
Channel 5 (3 for magnetic and 2 for electric)
Continuous operation duration 2 months
Maximum retrieve period 4 months
Magnetometer bandwidth DC~500 Hz
Magnetometer noise 6pT / sqrt (Hz) @1Hz
Magnetometer measuring range ±100 μT
Voltage noise 1nV / sqrt (Hz) @1Hz
Electrode type AgCl
Dynamic range >120 dB
Power consumption 0.25 w
Sampling rate 1000, 500, 250, 100 sps
Weight (seismic anchor not included) 50kg
Seismic anchor weight 25
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