It receives the mannered null input signal to make the interference separate which originates in the break-through in the position search device of the metal flexible pipe

摘要

When travelling the conductor line (104 and 126) over a longer distance lining up, the alternating current signal which is used for cable position search, connects to the conductor line which it adjoins, or is a possibility of leaking out. The electric current which this in the conductor line which it adjoins flows and is connected forms the electromagnetic distortion, makes the position fixing of the conductor line which becomes this object difficult. The magnetic field which it occurs both (or furthermore many) conductor lines (104 and 126) as a result has the magnetic field where it is known as the electromagnetic field where it has, the distortion of non circular form generally. The conductor line which is in the midst of investigating (104) inaccuracy, or it brings the method in order to discover position of being established, with even the position search which you are wrong. The method of being explained in this bill the phase reference signal which is input on this conductor line the transmitter (101) by this loses the electromagnetic distortion which originates in the conductor line which is connected by recovering in two signal strength components. This in-phase signal the object conductor line (104) displays electromagnetic strength, substantially there is no electromagnetic distortion. The other orthogonal signal includes the component of the electromagnetic field where it is related to the distortion.