APPARATUS AND METHOD FO DETERRING BIRDS BY LASER

Abstract

The invention concerns an apparatus and a method for deterring birds, comprising a frame fixedly disposed on a structure; a laser light generator connected with the frame, including a laser light source for generating a laser light beam; a supply circuit for supplying the laser light source; driving means connected with the laser light generator, for having at least a part of the laser light generator move; and a control element for controlling the laser light source and the drivable part of the laser light generator, wherein the driving means are arranged for causing a movement to be executed of at least a drivable part of the laser light generator. Thus, an apparatus and a method are obtained having a greater effect in deterring birds.

Claims

1. A method for deterring birds from a fixed structure, the method comprising: generating in a fixedly disposed apparatus a bird deterring light beam, wherein the light beam performs a repetitive movement wherein the light beam is aimed at the fixed structure so as to clear the fixed structure by sweeping the laser beam with such a high frequency along side the fixed structure that the moving beam keeps the birds away from the fixed structure, wherein input means are arranged for inputting properties of the path to be described by the beam.

2. The method according to claim 1, wherein the light beam is caused to move in a vertical plane with fast movements in a horizontal plane with slower movements.

3. The method according to claim 1, wherein the laser beam is swept with a high frequency along side the fixed structure, so that an apparent surface is obtained that swerves.

4. The method according to claim 1, wherein the beam has a wavelength of between 300 nm and 400 nm.

5. The method according to claim 1, wherein the angle of elevation of the exiting light beam is limited.

6. The method according to claim 1, wherein the beam is caused to move jerkily.

7. The method according to claim 1, wherein the beam is caused to describe a figure which forms the envelope of a structure.

8. The method according to claim 1, wherein a control element is arranged for repetitively causing a program to be executed by the beam.

9. The method according to claim 8, wherein the control element is arranged for each time executing the same program.

10. The method according to claim 8, wherein the control element is arranged for each time executing a different program.

11. The method according to claim 8, wherein the control element is arranged for executing a program at predetermined points of time.

12. The method according to claim 8, wherein the control element is arranged for executing a program after detection of a number of birds by a bird detection element.

13. The method according to claim 12, wherein the detection element is connected with the control element and wherein the control element is arranged for executing a program when the detection element detects the approach of a subject.

Description

[0029] The present invention will now be elucidated on the basis of the accompanying drawings in which the figures represent the following:

[0030] FIG. 1: a schematic side view of an apparatus according to the invention;

[0031] FIG. 2: a schematic top plan view of the apparatus depicted in FIG. 1;

[0032] FIG. 3: a side elevation of an apparatus according to the invention and the laser beam generated thereby;

[0033] FIG. 4: a top plan view of a specific configuration according to the invention;

[0034] FIG. 5: a top plan view of a variant of the configuration represented in FIG. 4;

[0035] FIG. 6: a perspective view of another embodiment; and

[0036] FIG. 7: a side view of a configuration suitable specifically for wind turbines.

[0037] The apparatus depicted in FIGS. 1 and 2, designated as a whole with 1, comprises a fixedly disposed frame 2, in which a laser source 3 is mounted, with its optical axis 4 directed upwards. Placed above the laser source 3 and connected with the frame 2 are a pair of bearings 5, in which a shaft 6 is rotatably bearing-mounted. The shaft 6 is drivable for rotation by an electric motor 7. Arranged on the shaft is a mirror 8. By drive of the electric motor 7 the rotation position of the mirror 8 is adjusted to thereby control the amount of deflection of the laser beam 4 exiting from the laser source 3 in a horizontal plane. For the supply of the laser source 3 a supply unit 9 is present, and for the control of the electric motor 7 and the laser source 3 a control unit 10 is in place. The whole is accommodated in a housing 11. The supply unit may be formed by a battery, typically combined with a PV panel, but may also be formed by a connection to a supply network.

[0038] Upon activation of the apparatus, by means of the supply unit 9 and the control unit 10 the laser source 3 is switched on so that a laser beam 4 exits from the laser source 3 along the optical axis. This laser beam 4 strikes the mirror 8, which has an oblique position, so that the laser beam 12 reflected by the mirror 8 exits in a horizontal direction. With this, the apparatus is suitable for generating a stationary laser beam, which, as has been described above, exits in horizontal direction and which is perceived by the birds, so that the birds are scared away. The laser beam 12, under the influence of the control unit 10 and the mirror 8, may also exit upwardly inclined or downwardly inclined. In the latter case the laser beam will then hit the ground and cause a light spot on the ground which scares away the birds.

[0039] The above concerns a stationary solution; it is also possible, as has already been explained, to utilize a movable laser beam. To this end, in the above embodiment, the electric motor 7 is to drive the mirror such that the exiting laser beam 12 moves in the vertical direction. By the dynamics resulting from this, the birds are deterred more easily. Such a situation is represented in FIG. 3. When the mirror is driven with a high speed, the birds perceive the laser beam as a surface 13. This embodiment requires a fast moving mirror. While to this end use can be made of a fast rotating electric motor, as in the above-described embodiment, it is also possible to utilize for this purpose an electric driving element having the structure of a galvanometer.

[0040] FIG. 4 shows a situation in which two apparatuses 1a, 1b like the one shown in FIG. 3 are placed on opposite sides of a runway 15. With these, two laser beams 12 are generated which, as a result of their rapid movement, apparently form a vertical surface. In the situation shown in FIG. 4, it is clear how these surfaces keep the runway 15 clear of birds 16 in order to minimize the danger of an airplane 17 hitting a bird. It is obviously necessary here that prior to generating the radiation pattern represented in FIG. 4 the birds 16 be scared off the runway 15, for instance by having either or both of the laser beams 12 sweep above the runway 15.

[0041] Naturally, other configurations are possible; thus, it is possible to dispose the apparatuses 1 in such a manner that the apparent surfaces 13 extend transversely to the runway 15. This prevents birds 16 from moving in the longitudinal direction of the runway to the part where the airplanes 17 land and take off. It is incidentally noted that it is more attractive when only a single apparatus 1 according to the invention is present and the laser beam exiting from the apparatus 1 moves not only in the vertical plane but also in the horizontal plane. Particularly when the movements in the vertical plane are fast and the movements in the horizontal plane slower, a surface is obtained that, to the birds, apparently swerves. This configuration, for that matter, can also be used in other situations.

[0042] Furthermore, the above described apparatuses may be coupled with a prediction device for predicting the arrival of an airplane, so that the apparatus is switched on only then. To this end, a link with the installations of the air traffic control can be made. Also, a link with a presence detector for birds can be made in order to generate a laser beam only when birds are present.

[0043] Finally, FIG. 6 shows a situation in which an apparatus 21 according to the invention is disposed on a helicopter platform 22, for instance on an oil rig. On a steel construction 23, which is part of an oil rig not further shown, the helicopter platform 22 has been placed, as well as an apparatus 21 according to the invention. This apparatus is arranged for generating a laser beam 25, which is directed towards the helicopter platform 22. The laser beam can then move over the platform 22 in both directions to scare away birds present on the platform. Furthermore, the apparatus according to the invention comprises a water cannon 27 placed on the apparatus 21. The control of the water cannon 27 is then programmed such that the water jet 28 exiting from the water cannon 27 is aimed at the same part of the platform 22 as the laser beam 25 exiting from the apparatus 21. Upon simultaneous operation of the laser beam 25 and the water jet 28, the birds are deterred in two ways at the same time. It is also possible, however, to use the water jet as an alternative to the laser beam, for instance when due to glaring sunlight the laser beam is poorly visible to the birds. Also, it is possible to use the two media alternately.

[0044] Also in this embodiment, the laser source or the water cannon may be arranged to be activated only upon detection of birds or in anticipation of the arrival or departure of a helicopter. Finally, as in the initially discussed embodiment, it is possible to aim the water jet or the laser beam at the place where birds have been observed.

[0045] The embodiment shown in FIG. 7 is suitable for placement on a wind turbine 30. The apparatus 31 according to the invention is placed on a ring 32, which is arranged rotatably around the tower 33 of the wind turbine 30. The apparatus 31 is movable along the ring 32 by drive means not shown. The apparatus 31 is arranged for radiating a laser beam 34 which extends obliquely upwards at an angle to the tower 33. The angle is then chosen such that the laser beam 34 upon rotation of the apparatus along the ring describes a cone, the cone enveloping the path of the blades 35 of the wind turbine 30.