Axial high-temperature RF SQUID gradiometer system for geomagnetic prospecting

Author

Zhao, Jing ; Wang, Jun ; Liu, Guangda

Author_Institution

Coll. of Instrum. & Electr. Eng., Jilin Univ., Changchun, China

fYear

2009

fDate

16-19 Aug. 2009

Abstract

In order to implement the geomagnetic prospecting in unshielded environment, an axial high-temperature radio frequency superconducting quantum interference device (RF SQUID) gradiometer system operating in liquid nitrogen at 77K is proposed in the paper. The gradiometer consists of two RF SQUID magnetometers, each with sensitivity better than 30 fT/Hz^1/2. The gradiometer baseline is adjustable from 6 cm to 10 cm. The SQUID electronics we designed is automated and the working points are adjusted by the integrated microcontroller. The system maintains continuously two RF SQUID magnetometers in the flux-locking condition. According to a long-term experiment, it is indicated that the gradiometer system developed by us demonstrated a good performance in the application of geomagnetic prospecting.

Keywords

SQUID magnetometers; geomagnetism; geophysical equipment; geophysical prospecting; geomagnetic prospecting; high temperature RF SQUID gradiometer; integrated microcontroller; magnetometers; superconducting quantum interference device; unshielded environment; Geologic measurements; Geomagnetism; Geophysical measurements; Instruments; Magnetic field measurement; Magnetic sensors; Nitrogen; Radio frequency; SQUIDs; Superconducting magnets; RF SQUID; SQUID electronics; geomagnetic prospecting; gradiometer;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronic Measurement & Instruments, 2009. ICEMI '09. 9th International Conference on

Conference_Location

Beijing

Print_ISBN

978-1-4244-3863-1

Electronic_ISBN

978-1-4244-3864-8

Type

conf

DOI

10.1109/ICEMI.2009.5274771

Filename

5274771