Non-contact AC/DC sensing probe and sensing method and application thereof

A non-contact AC/DC sensing method, comprising the following steps:

• constructing a sealed shielding space for preventing electromagnetic interference by a metal shielding shell, the metal shielding shell is provided with a detection port that can allow an electromagnetic signal in a specific direction to enter the shielding space, and arranging, in the shielding space, a Hall sensing module that can collect the electromagnetic signal passing through the detection port to enter the shielding space;
• an iron rod for enhancing sensitivity of the Hall sensing module to a magnetic field change is arranged beside the Hall sensing module;
• wherein the Hall sensing module comprises a Hall element, a first signal amplification circuit, a second signal amplification circuit, and a noise filter circuit, the Hall element is connected to the first signal amplification circuit, the iron rod is connected to the second signal amplification circuit, and the metal shielding shell is connected to the noise filter circuit;
• during sensing of a single wire, enabling the detection port to be close to but not in contact with the single wire, so that an electromagnetic signal generated when an AC/DC current flows in the single wire can be allowed to pass through the detection port to enter the shielding space to be collected by the Hall sensing module, and the Hall sensing module outputs a corresponding voltage signal;
• during sensing of a non-twisted cable formed by two or more wires arranged in parallel, enabling the detection port to be close to but not in contact with the non-twisted cable, and then rotating around the non-twisted cable, so that the detection port faces the wires in the non-twisted cable one by one, and an electromagnetic signal generated when an AC/DC current flows in a target wire in the non-twisted cable can be allowed to pass through the detection port to enter the shielding space to be collected by the Hall sensing module, and the Hall sensing module outputs a corresponding voltage signal;
• and
• during sensing of a twisted cable formed by two or more wires twisted together, enabling the detection port to be close to but not in contact with the twisted cable, and then rotating around the twisted cable and/or moving along a direction of a central axis of the twisted cable, so that an electromagnetic signal generated when an AC/DC current flows in a target wire in the twisted cable can be allowed to pass through the detection port to enter the shielding space to be collected by the Hall sensing module, and the Hall sensing module outputs a corresponding voltage signal.