Patent ID: 9551691
Date: 2017-01-24
CPC Classifications: G01H,G01N,H01L

Claim:
1. An L-mode guided wave sensor that inspects an inspection target by using an L-mode guided wave, comprising: a vibrator which during normal use is attached to an inspection target; and a coil to which an AC voltage is applied, wherein the vibrator is formed into a plate shape by a ferromagnetic material, the vibrator includes a first side surface and a second side surface, the first side surface and the second side surface are respectively located on sides opposite to each other in thickness directions of the vibrator, the first side surface faces an outer surface of the inspection target during normal use, the coil is wound around the vibrator such that an axis of the coil extends in a direction perpendicular to the thickness directions, and the coil repeatedly and alternately passes an area on a side of the first side surface and an area on a side of the second side surface, and in a state where the vibrator is attached to the outer surface of the inspection target such that the first side surface of the vibrator faces the outer surface of the inspection target, the AC voltage is applied to the coil, so that vibration of the vibrator is transmitted to the inspection target to generate an L-mode guided wave in the inspection target.