Japan Oil, Gas and Metals National Corporation

Kyoto University

Koichi Okuzumi

Akira Saito

Toshifumi Matsuoka

Yasuhiko Nagasaki

A magnetic field sensor deviceincludes a sensor sectionthat includes a magneto-impedance devicehaving a magnetic amorphous structure, and rod-shaped core sectionsandthat guide a magnetic field to the magnetic amorphous structure in a longitudinal direction with respect to the magnetic amorphous structure. The core sectionsandmay be provided on either side of the magnetic amorphous structure in the longitudinal direction. The core sectionsandmay be disposed so that the longitudinal direction of the magnetic amorphous structure coincides with the longitudinal direction of the core sectionsand. The magnetic field sensor devicemay include environmental magnetic field cancellation meansandthat generate a correction magnetic field that cancels the environmental magnetic field input to the magnetic amorphous structure.

Magnetic field sensor device

An underground electromagnetic exploration method using an induced current generating transmitter that cyclically generates an induced current includes repeating magnetic field observations at multiple measurement points on earth's surface, the magnetic field observations including observing a magnetic field including a magnetic field signal based on output from the induced current generating transmitter using a magnetic field sensor device including a sensor and a rod-shaped core; wherein the sensor includes a magneto-impedance device having a magnetic amorphous structure; and wherein the rod-shaped core guides a magnetic field to the magnetic amorphous structure and is disposed longitudinally along the magnetic amorphous structure, and storing magnetic field observational data including a magnetic field signal based on output from the induced current generating transmitter, and calculating an underground specific resistivity distribution based on the observational data corresponding to each measurement point.

Growing community of inventors

Chiba, Japan

Koichi Okuzumi