Magnetism detection apparatus for underwater unexploded ordnance and method for controlling the same

A magnetism detection apparatus for detecting an underwater unexploded ordnance, comprising:

• a detection device comprising an array of detection assemblies arranged in a same plane, the array of detection assemblies being configured to detect magnetic fields and output magnetic field signals corresponding to locations of the detection assemblies;
• at least one first locating device disposed on one of the detection assemblies to locate this detection assembly and output a first coordinate signal corresponding to this detection assembly;
• and
• a central control device communicatively and respectively connected to each of the detection assemblies and the at least one first locating device, and configured to store information of relative locations of the detection assemblies, receive the magnetic field signals and the first coordinate signal, and obtain a respective location of the relative locations of a detection assembly of the detection assemblies sending a maximum magnetic field signal based on the first coordinate signal and the information of the relative locations of the detection assemblies;
• wherein each of the detection assemblies comprises:
• a head member, a first hollow space being defined in the head member;
• a magnetic field detector having a housing;
• and
• a plummet configured to keep the detection assembly aligned vertically in the water;
• wherein the head member, the housing, and the plummet are connected in sequence and have a common central axis;
• wherein the each of the detection assemblies further comprises a control device communicatively connected to the central control device and disposed in the first hollow space;
• the magnetic field detector comprises a first magnetometer and a second magnetometer disposed in the housing, located at different locations along the common central axis, and communicatively and respectively connected to the control device;
• the first magnetometer is capable of sending a first magnetic field signal to the control device, the second magnetometer is capable of sending a second magnetic field signal to the control device;
• and
• the control device is configured to receive the first magnetic field signal and the second magnetic field signal and send a magnetic field gradient signal to the central control device according to the first magnetic field signal and the second magnetic signal.