| 摘要 |
PURPOSE:To improve the hourly resolution, and also, to improve the detection of damage in a body to be inspected by arranging successively plural magnets in one line extending from a thick one to a thin one. CONSTITUTION:As for the probe, magnets are arranged successively in one line extending from a thick one to a thin one, placed so that adjacent magnets have each different polarity, respectively, and a magnet train 1 on which one face is formed and a coil 2 which passes through the face having the polarity of the magnet train 1 and is formed by winding an electric wire so as to bundle the magnets are provided. In this state, when an interval dn is set, respectively so that an expression I and an expression II (provided that thetan: an angle made by a wave front of an ultrasonic wave generated by the n-th magnet and the surface of a body to be inspected, dn: an interval between the respective centers of the (n-1)-th magnet and the n-th magnet, Sv: a sound velocity of the ultrasonic wave, f: the number of ultrasonic waves, lambda: wavelength of the ultrasonic wave, ln: a distance between the center of the n-th magnet and a focus) can be formed, a component in the depth direction of the ultrasonic wave forms a focus. In such a way, the hourly resolution of the probe is improved and damage of the body to be inspected can be detected easily. |
