JPH02234297A - Flat detecting invasion sensor - Google Patents

Abstract

PURPOSE:To obtain an invasion sensor having a simple, inexpensive and flat detecting area by arranging a projector so as to face a light receiver array obtained by linearly arranging plural light receivers, and constructing a invasion detecting area with the triangular area using a linearly arranged light receiving element array as a bottom side and a light emitting element as an apex. CONSTITUTION:Projected beams from a projector 110 are received by the all light receivers consisting of a light receiver array 120, optical paths from the projector 110 to the respective light receivers radially spread, and a triangular detecting area 10 using the light receiver array 120 as the bottom side and the projector 110 as the apex is formed. When an invading object interrupts the optical pats, >= one light receiver of the light receiver array 120 does not receive the projected beams. The invasion detecting means specifies the invading position of the object into the detecting area 10 based on the position of the light receiver which does not receive the beams. Thus the inexpensive invasion sensor having the flat invasion detecting area in a simple configuration can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intrusion detection sensor, and particularly to an intrusion detection sensor whose detection area has a planar spread.

[Conventional technology 1] Power transmission lines are necessary and indispensable equipment for today's power supply operations. Accidents or breakdowns in this equipment have extremely serious effects on today's highly electrified society, and in some cases may affect all directions. It is also possible that social functions in the area are paralyzed.

One of the accidents that occur on high voltage power transmission lines is a ground fault caused by abnormal proximity to or contact with a tree, a machine tool such as a crane, or a building. In the past, the only way to prevent these accidents was through visual monitoring by humans on site. However, in the crowded environment of urban areas, it is difficult to accurately prevent accidents through visual monitoring. In other words, in order to prevent these accidents, it is important to ensure the necessary separation distance from power transmission lines, but this is extremely difficult to measure with human eyes. Furthermore, it is quite possible that other objects may inadvertently approach the power transmission line abnormally without being aware of ensuring the separation distance M.

Therefore, there is a strong desire for a sensor that constantly monitors abnormal approaches to power transmission lines using a machine, without the need for human visual inspection. The abnormal approach of power lines can be seen as the intrusion of other objects into the space required to maintain the necessary separation distance. As a method of intrusion detection, methods that detect the interruption of infrared beams have been developed and put into practical use.

[Problems to be solved by the invention] However, in the case of conventional infrared beam intrusion detection sensors,
Basically, one light transmitting unit that emits a single focused infrared beam and one light receiving unit that receives the light are used as a pair. In cases where it cannot be determined, detection may not be possible. Of course, by arranging a large number of pairs of light transmitting parts and light receiving parts as described above, it is possible to perform similar surface detection, but the problem is that the size of the structure becomes large and the price increases, and at the same time the installation becomes very difficult. was there.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide an intrusion sensor having a planar detection area that is simple, inexpensive, and easy to install.

[Measures to Solve the Problems li1] In the planar detection intrusion sensor of the present invention, a light emitter is arranged opposite to a light receiver row in which a plurality of light receivers are arranged in a linear manner, and the projected light beam is directed toward the light receiver row. The spread of the emitted light beam of the emitter is set so that the light is received by all the receivers, and a triangular detection area is formed with the receiver row as the base and the emitter as the apex,
The detection area is configured by providing an intrusion detection means for identifying the position of an object entering the detection area from the position of the photoreceiver that did not receive the emitted light beam among the photoreceptors in the photoreceiver array. , the above triangular detection area is formed by providing multiple sets of emitters and receiver arrays and combining the detection distribution areas of each set so that the optical paths from the emitters to the receiver arrays intersect with each other. be able to. As a preferred form for expanding the detection area, two wooden rod-shaped light emitters and receivers, each consisting of a light receiver row in which a plurality of light receivers are arranged in a straight line and light emitters arranged at both ends of the light receiver row, are placed facing each other, and one of the rod-shaped light receivers is The spread of the emitted light beams is adjusted so that the emitted beams from the emitters of the emitters and receivers each encompass the entire array of receivers of the other bar-shaped emitter and receiver, forming a rectangular detection area as a whole, and the bar-shaped emitter and receiver Means for alternately projecting light from the projectors at both ends of the rod, and in synchronization with this, the intrusion of an object into the rectangular detection area by the position of the receiver that does not receive light among the rows of light projectors and receivers of opposing rod-shaped projectors and receivers. It is best to configure it with an intrusion detection means that knows the location. For practical application, at least one pair of bar-shaped emitters and receivers facing each other is installed near the power transmission line, and each bar-shaped emitter and receiver has a bar-shaped emitter and receiver that detects the alternating current electric field generated by the power transmission line and detects changes in the polarity of the alternating current electric field. By providing means for outputting a switching signal for alternating light emission of the emitters at both ends of the receiver and a light reception synchronization signal for the array of receivers, it is possible to detect abnormal approach of another object to the power transmission line. There are no restrictions on the type of light source of the projector, and IE
D. It is possible to use lasers, incandescent lamps, discharge lamps, etc., and it is also effective for children to use a reflector or lens in combination to adjust the spread of the projected beam.

[Operation] The light beam from the emitter is received by all the receivers in the receiver array, and the optical path from the emitter to each receiver spreads radially, creating a triangular detection area with the receiver array as the base and the emitter as the apex. is formed. If this optical path is blocked by an intruding object, one or more of the light receivers in the light receiver row will not receive the projected light beam. Intrusion detection means are
The position of the object entering the detection area is determined from the position of the light receiver that did not receive light.

In a configuration in which multiple sets of emitters and receiver arrays are provided to enlarge the detection area, there are many intersections within the detection area where the optical paths from the emitters to the receiver array intersect with each other. The position or coordinates of each intersection, that is, the intrusion position of the object, is detected by the intrusion detection means from the position of each set of light receivers that did not receive light.

In a configuration in which two bar-shaped emitters and receivers face each other, the emitters are arranged at both ends of the array of light receivers, so the light beam from the emitter of one bar-shaped emitter and receiver is different from the light beam from the other bar-shaped emitter. The light beams emitted from the light emitter of the light receiver intersect with each other to form a rectangular detection area as a whole. The two bar-shaped light emitters/receivers are located at both ends and alternately emit light, and in synchronization with this, the intrusion detection means alternately monitors the light receiving state of one and the other light receiver array. Therefore, the intrusion detection means is
While clearly distinguishing which side of the two rod-shaped light emitters and receivers is being monitored, the position of the light receiver that did not receive light is determined, and the position of the object entering the detection area is determined. A switching signal for alternately emitting light from the emitters at both ends of the two opposing bar-shaped light emitters and receivers, and a synchronization signal for monitoring the light reception of the array of light receivers in both bar-shaped light emitters and receivers are sent to the power transmission line by fl! Under the control system that detects the abnormal approach of an object, it can be generated directly from changes in the polarity of the alternating current electric field created by power transmission lines. Furthermore, this signal is completely synchronized for each rod-shaped light emitter/receiver pair and also for each tower.

[Example] Hereinafter, the specific content of the present invention will be explained in detail with reference to Examples.

FIG. 1 is a configuration diagram showing the principle of the planar detection intrusion sensor of the present invention, in which a light emitter 110 composed of a light emitting element 111 and a reflection jfi 112, and a plurality of light receivers, here a light receiving element 121, are arranged in a straight line. A photoreceiver array 120 is arranged to face each other. The spread of the light emitted by the light emitting element 111 is adjusted by a reflecting mirror 112 so that it irradiates all of the plurality of light receiving elements 121 arranged in a line facing each other. The outputs of the light-receiving elements 121 are transmitted to the light-receiving signal processing circuits 40, and the light-receiving elements 1
If any one of 21 cannot receive light, it is possible to judge from this fact that there is an intrusion and issue a V alarm, etc., and the intrusion position can be identified from the position of the light receiver that could not receive light. In this way, by arranging the emitter 110 to face the light receiver row 120 in which a plurality of light receivers are arranged in a linear manner, the light receiving element row 121 arranged in a linear manner is the base, and the light emitting element 111 is the apex. An intrusion detection area 10 consisting of a triangular area can be constructed. FIG. 2 is a configuration diagram showing an embodiment of the planar detection intrusion sensor of the present invention, which can detect an intrusion position by applying the principle shown in FIG. 1, and FIG. 3 shows its operation. This is a signal waveform explaining.

In FIG. 2, light emitters 11 A and B are placed at both ends of a light receiver array 120 in which light receivers 12 are arranged in a straight line from a to j.
are arranged to constitute a bar-shaped light emitter/receiver 1. Two bar-shaped light emitter/receivers 1 are installed facing each other in X and Y, and each of the light emitters 1
1 adjusts the spread of the projected light beam so that it covers the photoreceiver array l2 on the side opposite to this, thereby forming a rectangular detection area.・In addition, by applying a drive pulse obtained by combining the light emitting element control oscillator 2 and the light emitting element drive circuit 3, each floodlight 11 can be controlled on the X side and Y side as shown by A and B in FIG. 3. The light emitting elements are made to emit light alternately. In addition, 9 is the above drive pulse
This shows the communication signal line for synchronizing light emission to transmit to the projector of lIJj. The X and Y rod-shaped light emitters and receivers 1 are provided with light reception signal processing circuits 41 and 42 corresponding to each other.

The light receiving signal processing circuit 4.1.42 is connected to the A and B projectors 11.
In synchronization with the light emission timing of
The signals corresponding to the light receiving states of the light receivers 12 a to j, that is, the signals containing the presence or absence of light reception by these light receivers 12 and the position of the light receivers that did not receive light, are shown as X and X in FIG. 3, respectively.
Output as shown by Y.

Now, if an object intrudes at position R, which is not shown in Figure 2, Yl\! The light emitted from A of J "H 1.. 1 to the receiver d in the X-side receiver row is blocked. At the same time, the light emitted from A's emitter 11 on the X side to Y(lJ!I* The light reaching the light receiver d in the array is also blocked.The light from the light emitters 11 on the
When an object enters the R position in the region where the projected beams of Only receiver d has a waveform that does not generate a received light output at the light emission timing of emitter 8 (when ON).Similarly, if an object enters the positions S, T, and U (not shown in Figure 2), In this case, the outputs corresponding to the photodetectors 12 a to j on the X side and Yffl!I are respectively S, T, and S in FIG.
The waveform is shown in the fJI region of U.

That is, S in the area where the projected beams of projector B intersect with each other.
If an object enters the XI! The output of the light receiver f on the II, Y side becomes non-output at the timing of the light emission from the light emitter B, as shown in the S region of FIG. Also, if an object enters the T or U position in the area where the beams of projectors A and B intersect, the light to the two receivers d and g will be blocked on the X side or Y side. , respectively third
In the figure, T area or Uff4. As shown in the area, both receivers d and g are in a state of no output at the timing of light emission from projectors A and B. Since these waveforms have combinations and output timings unique to each intrusion position, the outputs of these light reception signal processing circuits 41 and 42 are processed by the intrusion detection circuit 5 to detect the intrusion location. As explained with reference to Figs. 2 and 3, it is now possible not only to determine whether or not an object has entered the planar detection area, but also to identify the position of the object entering the planar detection area. did it. FIG. 4 is a configuration diagram showing an embodiment in which the surface detection intrusion sensor of the present invention is applied to a device for detecting the abnormal approach of other objects such as trees, cranes, and buildings to power transmission lines. In FIG. 4, a total of three sets of bar-shaped light emitters and receivers 1 facing each other as explained in FIG. It is placed so that it covers both sides with an appropriate distance between them. Thereby, abnormal approach of another object to the power transmission line 7 charged to a high voltage is detected, and a serious accident is prevented.

In the embodiment shown in FIG. 2 described above, the light emission timing of the A and B projectors 11 on both the X and Y sides was controlled by a set of the light emitting element control oscillator 2 and the light emitting element drive circuit 3, A communication signal line 9 between the rod-shaped emitters and receivers 1 was required. However, in the embodiment shown in FIG. 4, in each of the six sections of the transmission line tower, the alternating current electric field created by the high voltage power transmission line is used to eliminate the dedicated oscillator, and the light emission and reception synchronization shown in FIG. By installing a signal circuit, the communication signal line 9 for mutual synchronization is unnecessary. That is, as shown in FIG. 5, an @ electrode 81 that is grounded via a capacitor 82 is placed close to the power transmission line 7, and the ground AC voltage generated at the electrode 81 is transferred to the intermediate tapped transformer 2.
1 and two rectifiers 22 to separate the positive and negative polarity signals, and the light emission control signal generators 23 and 24 are operated by these positive and negative polarity signals. Since the AC voltage generated by the same power transmission line 7 is used, it is possible to obtain completely synchronized signals even in the different transmission T-line towers 6, and as a result, the This allows the A and B projectors 11 to emit light alternately and accurately in synchronization. As mentioned above, the communication signal line 9 for synchronization between the steel towers 6 is no longer necessary.

Next, it is necessary to collect the signals from the rod-shaped light emitters and receivers 1 of each steel tower 6 in one place and input them to the intrusion detection circuit 5 that detects the presence or absence of an intrusion and the intrusion position. For example, it is possible to use an optical fiber built into an optical fiber composite overhead ground wire (OPGW), and by transmitting light through the optical fiber, it is possible to constantly centrally monitor abnormal approaches to power transmission lines over a wide range at substations, etc. is possible.

[Effects of the Invention] As explained above, according to the planar detection intrusion sensor of the present invention, whereas the conventional light beam type intrusion sensor could only detect a linear area, the intrusion sensor is simple, inexpensive, and has a linear configuration. A planar intrusion detection area can be realized by means that are easy to install, and even the intrusion position within the planar detection area can be specified, which is an excellent effect.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the principle of the planar detection intrusion sensor of the present invention, and Fig. 2 is a block diagram showing an embodiment in which the intrusion position can be detected by applying the principle shown in Fig. 1. Figure 3 is an explanatory diagram showing the signal waveform. '& Figure 4 is a block diagram showing an embodiment in which the planar detection intrusion sensor of the present invention is applied to a power transmission line, and Figure 5 shows a synchronization of light emission and reception used in the embodiment shown in Figure 4. This is a horizontal diagram showing a signal circuit. In the figure, 1 is a bar-shaped light emitter/receiver, 11.110 is a light emitter, 12
1 is a light receiver, 120 is a light receiver array, 2 is an oscillator for controlling a light emitting element, 23.24 is a light emission control signal generator, 3 is a light emitting element drive circuit, 40, 41, 4.2 is a light receiving signal processing circuit, and 5 is a light receiving signal processing circuit. An intrusion detection circuit, 6 is a transmission line tower, 7 is a power transmission line, 81 is an electrode, 82 is a capacitor, and 9 is a communication signal line for synchronizing light emission.

Claims (1)

[Claims] 1. A light projector is arranged opposite to a light receiver array in which a plurality of light receivers are arranged in a linear manner, and the light emitter is arranged so that the projected beam is received by all the light receivers in the light receiver row. The spread of the emitted light beam is set to form a triangular detection area with the receiver row as the base and the emitter as the apex. A planar detection intrusion sensor comprising an intrusion detection means for specifying the intrusion position of an object into the detection area. 2. Multiple sets of emitters and receiver arrays that form triangular detection areas are provided, and the detection areas of each set are combined so that the optical paths from the emitters to the receiver arrays intersect with each other, thereby expanding the detection area. The planar detection intrusion sensor according to claim 1, characterized in that: 3. Two rod-shaped light emitters and receivers, each consisting of a linear array of light receivers and a light emitter arranged at both ends, are placed facing each other, and light is emitted from the light emitter of one of the rod-shaped light emitters and receivers. The spread of the emitting beam is adjusted so that each beam encompasses all the receiver rows of the other bar-shaped emitter and receiver, forming a rectangular detection area as a whole, and the emitters at both ends of the bar-shaped emitter and receiver are alternately emitted. and in synchronization with this, an intrusion detection means for detecting the position of an object entering the rectangular detection area based on the position of the light receiver that does not receive light among the light receiver rows of opposing rod-shaped light emitters and receivers. The planar detection intrusion sensor according to claim 1, characterized in that: 4. At least one pair of rod-shaped emitters and receivers facing each other is installed near the power transmission line, and each rod-shaped emitter and receiver detects the alternating current electric field generated by the power transmission line and detects changes in its polarity using the emitters at both ends of the rod-shaped emitter and receiver. 4. The planar detection intrusion sensor according to claim 3, further comprising means for outputting a switching signal for alternating light emission and a light reception synchronization signal for the light receiver array to detect abnormal approach of another object to the power transmission line.