Working principle of the optical cable routing detector is what?

light cable routing detector based on electromagnetic induction principle, based on theory of step voltage, combined with the digital filter, wireless receiving, software control and design of high-tech products. Routing detectors

electromagnetic induction:
the basic working principle is: electric and magnetic wave generated by the transmitter and the transmission connection by different way to send signals to detect underground metal pipe line, underground metal pipeline after induction to the electromagnetic wave, surface induced current in underground metal pipelines, induced current will be along the metal line spread into the distance, in the process of current transmission, and through the underground metal pipelines to ground radiate electromagnetic waves, such as optical cable routing detector receiver on the ground detection, in underground metal pipelines are above ground to receive electromagnetic wave signal, through changes in the received signal strength can distinguish the position of the underground metal pipelines and directions.
this principle to achieve conditions:
first of all, is to have enough electricity source, have formed in the power transmission line current, current in the process of flow and a magnetic field around the line; Next, want to have to accept the specific magnetic circuit, the changing process of the magnetic field in the form of electrical signals. This by electric magnetic again by the process of magnetic substation, is the basic principle of optical cable routing detectors. Step
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in the first place, to ensure that the power flow to the point of the earth (line The leakage point) , at this point, will form the electric field around it with the leakage point as the center, in the form of electric potential, diminishing evenly spread out, the same circumference equal potential. Next, want to have a potential difference can be detected circuit, such as electric potential is measured circumference of a circle, the circle is the leakage point ( Cable fault point) 。 This is the light cable routing step detector voltage according to the fixed point theory.