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Low-noise, low-power-consumption seafloor vector magnetometer
- Journal of Oceanology and Limnology Vol. 41, Issue 2, Pages: 804-815(2023)
- Affiliations：
1.China University of Geosciences, Beijing 100083, China
2.Guangzhou Marine Geological Survey, China Geological Survey, Ministry of Natural Resources, Guangzhou 511458, Chinaa
3.SCSIO Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
4.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
- Author bio：
ck@cugb.edu.cn
- Funds：
DOI：
CLC：Received：08 May 2022，
Accepted：02 June 2022，
Online First：15 July 2022，
Published：01 March 2023
- Accepted：
Scan QR Code
LI Xiaochen,LUO Xianhu,DENG Ming,et al.Low-noise, low-power-consumption seafloor vector magnetometer[J].Journal of Oceanology and Limnology,2023,41(02):804-815.
摘要
Abstract
The seafloor vector magnetometer is an effective tool for marine geomagnetic surveys and seafloor magnetotelluric (MT) detection. However
the noise
power consumption
cost
and volume characteristics of existing seafloor vector magnetometers are insufficient for practical use. Therefore
a low-noise
low-power-consumption seafloor vector magnetometer that can be used for data acquisition of deep-ocean geomagnetic vector components is developed and presented. A seafloor vector magnetometer mainly consists of a fluxgate sensor
data acquisition module
acoustic release module
glass sphere
frame
burn-wire release
and anchor. A new low-noise data acquisition module and a fluxgate sensor greatly reduce power consumption. Furthermore
compact size is achieved by integrating an acoustic telemetry module and replacing the acoustic release with an external burn-wire release. The new design and magnetometer characteristics reduce the volume of the instrument and the cost of hardware considerably
thereby improving the integrity and deployment efficiency of the equipment. Theoretically
it can operate for 90 days underwater at a maximum depth of 6 000 m. The seafloor vector magnetometer was tested in the South China Sea and the Philippine Sea and obtained high-quality geomagnetic data. The deep-water environment facilitates magnetic field data measurements
and the magnetometer has an approximate noise level of 10 pT/rt (Hz)@1 Hz
a peak-to-peak value error of 0.2 nT
and approximate power consumption of 200 mW. The fluxgate sensor can measure the magnetic field in the lower frequency band and realize geomagnetic field measurements over prolonged periods.
关键词
Keywords
references
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