A magnetic probe is a sensing device used to detect magnetic fields, measure magnetic field strength and direction, and convert magnetic signals into electrical signals that can be processed by instruments. Its core component is a magnetic sensor, such as Hall element, magnetoresistive sensor or fluxgate sensor, which has high sensitivity to changes in the magnetic field. The magnetic probe is usually equipped with a probe head for precise positioning and a signal transmission line for connecting to a data acquisition instrument or a control system.

Magnetic probes are widely used in scientific research, industrial production, aerospace, automotive electronics and other fields. In scientific research, they are used in experiments related to electromagnetism, material science and geophysics to measure the magnetic properties of materials and the distribution of the earth's magnetic field. In industrial production, they are used for non-destructive testing of metal materials, such as detecting cracks and defects in steel plates by measuring changes in the magnetic field; they are also used to monitor the operation status of motors and generators by detecting the magnetic field of the rotor. In aerospace, magnetic probes are used in the navigation system of aircraft and spacecraft to provide magnetic field data for attitude control and position determination.

The main advantages of magnetic probes are high measurement accuracy, fast response speed, good stability and strong anti-interference ability. They can work in a variety of environments, including high temperature, low temperature and high pressure, and can realize non-contact measurement, avoiding damage to the measured object. With the development of microelectronics technology, magnetic probes are becoming more and more miniaturized and integrated, which can meet the requirements of precise measurement in small spaces. They are an important tool for understanding and utilizing magnetic fields in various fields.