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Leakage Cable Principle
- Aug 15, 2018 -

The leakage cable intrusion detector consists of two parts: the main body of the detector and two leakage cables specially manufactured according to the design requirements. The main detector consists of a power supply unit, a transmitting power supply and a receiving power supply. Signal processing unit and detection unit are composed.

The leakage cable as the detection unit consists of two leakage cables and two non-leakage cables connected with it. The nominal length of each non-leakage cable is 10 meters, and the nominal length of each leakage cable is 100 meters.

The transmitting unit generates high frequency energy fed into the transmission leakage cable and transmitted in the cable. When energy is transferred along the leakage cable, part of the energy passes through the gap of the cable into the space, and the electromagnetic field is established within the area of the guarded space. Part of the energy is received by the receiving leakage cable installed nearby, forming a direct coupling of the sending and receiving energy. When the intruder enters the induction area formed by two cables, this part of electromagnetic energy is disturbed, causing changes in the received signal. The signal changed after amplification processing is detected by the processing unit, and the alarm indicator light is turned on. At the same time, the relay contact is turned on, and the signal is output to the control center.