The present application relates to the technical field of geophysical exploration, in particular to a downhole three-component
magnetic field sensing system based on
atomic magnetometer. The downhole three-component atomic
magnetic field sensor is connected with the
optical fiber signal modem in the ground
well logging vehicle through the armored photoelectric composite cable. The
optical fiber signal modem is used for real-time
demodulation of the three-component
magnetic field signals and three-component attitude signals measured by the three-component atomic magnetic field sensor. The three-component atomic magnetic field sensor comprises a non-magnetic high-temperature packaging structure, a high-temperature-resistant atomic
gas chamber module, a three-axis orthogonal
laser optical
system, a high-temperature-resistant photoelectric detection array, a
power management module, a temperature sensor, a magnetic field solving and
signal processing unit and a three-component
optical fiber attitude sensor which are arranged in the non-magnetic high-temperature packaging structure. The three-component atomic magnetic field sensor adopts the
atomic magnetometer measurement principle, combines the high-temperature-resistant materials and the optimized heat dissipation design, and can work stably in an environment of up to 200 DEG C.