The invention provides an annular
laser-electromagnetic ultrasonic focusing probe which comprises a probe shell, an optical lens group, an
optical fiber, an annular permanent
magnet, an annular receiving coil and an annular focusing
laser beam. The optical lens group is fixed in the probe shell, the
optical fiber is connected at the top of the probe shell and used for leading in a single-
beam laser source, the annular permanent
magnet is fixed at the bottom of the probe shell, the annular receiving coil is centrally pasted at the bottom of the annular permanent
magnet, the single-
beam laser source led-in by the
optical fiber is coincided with an
optical axis of the optical lens group, the annular focusing
laser beam is formed at a probe outlet and used for exciting focusing ultrasonic
waves in a
metal sample, and the inner
diameter of the annular permanent magnet and the annular receiving coil is larger than the outer
diameter of the annular focusing laser beam. According to the focusing probe, the optical lens group generates annular lasers, ultrasonic
body waves of point focusing can be excited, focusing ultrasonic echo signals are received by the aid of the annular permanent magnet and the annular receiving coil, integral transceiving is achieved, and the capability for detecting defects of
metal structure bodies is enhanced. The probe is compact in structure, convenient to move and operate and high in detection efficiency and can be used for detecting inner defects of
metal materials.