Abstract: A central maintenance apparatus of sensor for geophysical exploration includes a body part cylindrically formed to wrap a circumference of a sensor rod; and a plurality of wing parts lengthwise formed at an outer wall of the body part in a convex, semi-elliptic shape with a predetermined width, and formed therein with a cavity, wherein the wing part is formed with a plurality of through holes passing through the cavity from an outside, and has a shape-changing elasticity when a pressure is applied to a direction of the body part. At this time, when an obstacle is encountered while moving inside a borehole, the wing part having a shape-changing elasticity can avoid the obstacle like sliding off the obstacle to allow the central maintenance apparatus of sensor to automatically rotate.

Abstract: A magnetic sensor for borehole magnetometer includes an upper-opened pipe-shaped housing; a frame installed at an inside of the housing; an upper-opened magnetic sensor part installed at a bottom side of the frame; a lid covering the opened upper side of the magnetic sensor part; and a magnetic sensor disposed at an inside of the magnetic sensor part to measure a magnetic force, wherein an upper side and a bottom side of the magnetic sensor is respectively installed with a spring, a bottom side of the lid and the magnetic sensor part are formed with a fixing groove for fixing an upper spring and a bottom spring each installed at an upper side and a bottom side of the magnetic sensor.

Abstract: A magnetic sensor for borehole magnetometer includes an upper-opened pipe-shaped housing; a frame installed at an inside of the housing; an upper-opened magnetic sensor part installed at a bottom side of the frame; a lid covering the opened upper side of the magnetic sensor part; and a magnetic sensor disposed at an inside of the magnetic sensor part to measure a magnetic force, wherein an upper side and a bottom side of the magnetic sensor is respectively installed with a spring, a bottom side of the lid and the magnetic sensor part are formed with a fixing groove for fixing an upper spring and a bottom spring each installed at an upper side and a bottom side of the magnetic sensor.