Oil cup liquid level detection structure and detection method

The invention relates to an oil cup liquid level detection structure and method. The oil cup liquid level detection structure can comprise a metal rod arranged in the oil cup and a current emitter connected with the metal rod, and pulse current emitted by the current emitter and the metal rod form a first magnetic field; the metal rod is sleeved with a first floating ring and a second floating ring, the first floating ring is located above the second floating ring, a first permanent magnet is arranged in the first floating ring, a second permanent magnet is arranged in the second floating ring, the first permanent magnet forms a second magnetic field around the first floating ring, and the second permanent magnet forms a third magnetic field around the second floating ring; the top of the metal rod is connected with the transducer, the bottom of the metal rod is connected with the damper, the damper is used for absorbing the first torsional wave and the second torsional wave, and the transducer is used for ca