JPS5856097A - Invasion alarm - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intrusion warning device, and particularly in an intrusion warning device that requires intrusion warning over a long boundary, the present invention is designed to prevent malfunction due to induced noise superimposed on an intrusion detection sensor. Nine things.

Dangerous or important facilities such as power plants, substations, airports, energy storage bases such as petroleum or bunds, gunpowder and fuel storage sites, and chemical factories generally have wire mesh or wire mesh around the perimeter of their premises. There are some people who intentionally or accidentally climb over or break through these fences and walls while constructing the concrete. It is necessary to have a detection sensor detect the intruder, and then automatically notify the manager working in the control room to take appropriate measures such as warning the intruder as necessary.

Conventional intrusion prevention devices used for such purposes convert the physical quantity of an object passing through the boundary into the simplest possible output signal using an intrusion detection sensor installed on the required boundary, and then detect the physical quantity based on the change in this output signal. The detection sensor in such an intrusion warning device 1K is, for example, two parallel conductors with at least different potentials, and these two conductors are made of, for example, pressure-sensitive conductive rubber or the like. There is one that can be constructed by encapsulating anisotropically conductive rubber and use nine pressure-sensitive sensors.

For such pressure-sensitive sensors, if an intruder inadvertently places a pressure sensor on the boundary to suppress or cut the sensor, a short circuit or open state may occur between the two conductors.
Therefore, a change in electrical resistance occurs. Intrusion can be detected by extracting this resistance change as an output signal and capturing it as a change in DC voltage at the receiver.

FIG. 1 shows an example of such a conventional intrusion warning device, in which numeral 1 denotes nine pressure-sensitive detection sensors provided with a security boundary IsK for intruders. Here, pressure sensitive sensor 1
For example, two conductor detection wires and 2B are wrapped with pressure-sensitive conductive rubber 3.
, each detection sensor l of a suitably determined unit length is provided at a boundary 11, and the in-phase sensors 1 are connected in series as shown in the figure, and the terminals of the detection lines 2 and 2B are receivers. Connected to 4. Here, the receiver 4 detects an intrusion by detecting a voltage change due to a change in resistance of the sensor 1.

However, in the case of such conventional intrusion prevention devices, it is difficult to install them in facilities such as those mentioned above.
Inductive noise from high-voltage power lines, transformers, circuit breakers, etc. is likely to be superimposed on the detection lines 2 and 28 (this induced noise may cause the receiver 4 to malfunction, regardless of whether an intrusion accident has occurred). Friend may issue false alarms such as a break-in accident.

The object of the present invention is to eliminate the above-mentioned drawbacks and cancel out noise components superimposed on the detection line in the detection line,
Therefore, it is possible to provide an intrusion warning device that prevents V4 operation of a receiver by reducing external noise.
be.

That is, in the present invention, a plurality of detection sensors each having two detection lines are connected in series and placed on a boundary line, and the presence or absence of the intruder is detected by an output signal taken out from one of the detection sensors. In the nine intrusion warning device, the plurality of detection sensors connected in series are connected so that the two detection lines alternately cross each other at each connection part, and the alternating current superimposed on the detection sensor is connected. The present invention is characterized in that the noise components are inverted for each adjacent detection sensor to cancel each other out.

The present invention will be described in detail below based on the drawings.

In the following, the same reference numerals will be used for the same parts as in FIG. Distance 2 diagram shows one embodiment of the present invention. Here, each detection sensor 1 is arranged so that the normal phase and the negative phase of the unit length detection sensor 1 are reversed for each adjacent detection center t1. Cross the two detection lines of 1 and 2B and connect them.

By connecting the detection lines 2 and 2B to the receiver 4 in this way, the superimposed noise components of the detection lines 2 and 2B of each sensor cancel each other out, so the input/output terminals 4A and 2B of the detection lines 2 and 2B to the receiver 4 cancel each other out. In 4B, noise components are reduced.

As explained above, in the present invention (Yoresha), the detection lines of the connected detection sensors are connected so that the positive and negative phases are alternately reversed, so that the external noise components superimposed on the detection sensors are canceled out by each other. As a result, noise components input to the receiver are reduced, and malfunctions of the receiver can be prevented.

[Brief explanation of drawings]

Figure 1 is a diagram showing an example of a conventional configuration of an intruder warning device using a pressure-sensitive sensor as a detection sensor, and Figure 2 is a diagram showing an example of the configuration of an intruder warning device according to the present invention. 1.-detection sensor, 2A, 2B--detection wire, 3.-conductive rubber, 4.-receiver, 4A
, 4B-Single output terminal. Patent applicant: Fuji Electric Manufacturing Co., Ltd. Patent applicant: Jyuuji Fuji Liu Ou Kencho

Claims (1)

[Claims] A plurality of detection sensors each having two detection lines are connected in series and placed on a boundary line, and the presence or absence of the intruder is detected by an output signal extracted from one of the detection sensors. In the intrusion warning device, the plurality of detection sensors connected in series are connected such that the two detection lines alternately cross each other at each connection part, and are superimposed on the detection sensors. An intrusion warning device characterized in that alternating current noise components are canceled out by inverting them for each of the adjacent detection sensors.