Transient electromagnetic inspection modulo and the transient electromagnetic survey instrument null which possesses the portable

摘要

There is provided a transient electromagnetic method and apparatus for inspecting objects using a moving sensor. The apparatus (13) includes a sensing portion (27) which has a transmitting antenna (29) and at least one receiving antenna thereon (31). The sensing portion (27) is located adjacent to the object which is to be inspected such that the antennas (29,31) are adjacent to the object. The sensing portion (27) is moved along the object at the same time as the transmitting antenna (29) is inducing current in the wall and the receiving antenna (31) is producing a receiving signal of the induced current diffusion in the wall. Because the antennas (29,31) are moving during data acquisition, the speed of inspection is increased. The data is then interpreted to determine the thickness of the object. IMAGE