The invention provides an electromagnetic
ultrasonic detection system based on electromechanical
hybrid frequency-modulation energy-gathered
irradiation. The
system employs a plurality of associate coil pairs of an electromechanical
hybrid apparatus to generate an alternative
electromagnetic field, the mechanical motion of the apparatus enables a static
magnetic field to be converted into an alternative
magnetic field, and a regularly-leaked transmitting terminal
magnetic field leads to energy gathering at a detection object and forms a
wideband frequency-modulation supersonic wave source. The ultrasonic wave oscillates on the surface of the detection object and generates an
electromagnetic field after being reflected in the detection object. An magnetic-induction reception array, which is arranged at a position where the intensity of the alternative
electromagnetic field generated by the multiple associate coil pairs and the static magnetic field are both weak, is utilized for inducing variation of the induced electromagnetic field, thereby receiving ultrasonic reflection wave
signal. The magnetic field generated by permanent
magnet does not have the conversion loss from
electric energy to
magnetic energy, the conversion energy efficiency is high, the
magnetic field energy is gathered, the
emission efficiency is improved, reception
noise is reduced, detection precision is high, and the
system and the method are relatively applicable to detection during operation, fixed-point heating auxiliary treatment, noninvasive lossless detection on iron
ion in blood, and the like.