EREV-CS Base Station Cesium Optical Pumping Magnetometer

Mainly used as a daily monitoring base station or a fixed-point.

Introduce

EREV-CS base station cesium optical pumping magnetometer is mainly used as a daily change monitoring base station or a fixed-point continuous acquisition instrument. It can be widely used in various high-precision magnetic surveying projects. It is equipped with a built-in GPS module as standard, and has the wireless networking function of multiple instruments.

Applications

High-precision daily variation monitoring
high-precision magnetic surveying and prospecting
Magnetic basement and structure detection
Earthquake precursor and volcano precursor observation and other industries.

Features

EREV-CS adopts GPS timing function to ensure that the time of all instruments is exactly the same.
EREV-CS is easy to operate and can collect precise magnetic field values with just one keystroke.

Technical Parameters

Northern hemisphere working angle range	10°-85°
Southern hemisphere working angle range	170°-95°
Absolute accuracy	General less than 0.05nT
Sensitivity	0.0006 nT√Hz rms; 1Hz to 2Hz bandwidth peak-to-peak less than 0.003nT
Resolution	0.001nT
Dynamic range	10,000nT-100,000nT
Gradient tolerance	40,000nT/m
Sampling rate	1-60Hz or user selectable
Sampling mode	Continuous acquisition, gradient continuous acquisition
GPS	GPS(Built-in Systems), positioning accuracy of 2.5 meters, timing accuracy of 10-9 seconds
Wireless communication	900MHz, 6.4km under normal conditions
Storage medium	Built-in 16GB SD card, customers can choose 32GB or 64GB large-capacity memory card
Data transmission	USB cable
Battery indicator	Built-in 12V, 114Ah non-magnetic lithium battery; support external battery mode
Operating Temperature	-40℃-70℃
Weight	Console：about 12Kg (including battery) Sensor：0.8Kg
Dimensions	Console:470mm x 357mm×176mm(LWH) Sensor :φ63.5mm x 160mm
Data extraction software	Self-contained
Data preprocessing software	Erev OGM-link including diurnal correction processing, moving average filter , bad point deletion, averaging the same points, instrument noise calculation, drawing profile map, track back, support GPS format conversion

Example

On May 29, 2020, two EREV-CS base station cesium optical pump magnetometers were used to conduct static tests and comparisons with EREV-1+ proton magnetometers in the Ming Tombs area of Beijing. The EREV-CS sample rate is 5Hz, and the EREV-1+ sample rate is 3 seconds.

Instrument	Static Noise (nT)
EREV-1+	0.088513
EREV-CS（Q3）	0.004812416
EREV-CS（Q4）	0.00478403

From the test results, in the field environment of the Ming Tombs, the static noise of the 5Hz sampling of EREV-CS can reach 0.004nT.

Calculate the mean value of the deviation of the gradient values between the two probes = 0.055 nT.

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