JPH1059297A - Air intake shielding device using laser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air intake shielding device which can shield an air intake electromagnetically by a plasma, and can reduce the danger caught by a threat radar. SOLUTION: This shielding device is composed of a laser transmitter 2 loaded on an aircraft 1; optical devices 3 and 5 to lead the laser beam transmitted by the laser transmitter 2 to the air intake 4 of the aircraft 1; and a plasma source material 6 installed to the periphery of the air intake 4 of the aircraft 1. A plasma source material 6 generates a plasma by the irradiation of a laser beam flux, the plasma generated by the irradiation of the laser beam flux is diffused while being drawn by the laser beam flux, and the plasma covers the air intake 4 while expanding inside the air intake 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air intake shield device (radio wave reflection reduction device) using a laser used in a defense aircraft.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional technique. As shown in FIG. 4, a radio wave reflection reduction device 15 in which a plate made of a polymer material mixed with a magnetic powder such as ferrite is combined in a lattice shape inside the air intake port 4 of the conventional low radio wave reflective aircraft 1. However, it is fitted.

[0003] Threat radio waves such as radar waves are attenuated by the grid portion of the radio wave reflection reduction device 15, are reflected by the front of the engine inside the air intake, and then again.
Get out through the grid. Since the threat radio wave passes twice between grids having power absorption properties, the intensity of the reflected radio wave is weak, making it difficult for the threat radar to capture the radio wave.

[0004]

The prior art has the following problems. (1) The grid-like radio wave reflection reduction device attached inside the air intake also reduces the kinetic energy of the airflow flowing into the air intake. (2) Therefore, the aerodynamic efficiency of the air intake is reduced. (3) As a result, the performance of the propulsion device of the aircraft decreases. An object of the present invention is to provide a device that can solve these problems.

[0005]

[Means for Solving the Problems]

(First Means) An air intake shield device using a laser according to the present invention comprises: (A) a laser transmitter mounted on an aircraft; and (B) a laser beam transmitted by the laser transmitter of the aircraft. An optical device leading to the air intake,
(C) a plasma source material attached around the air intake of the aircraft, (D) the plasma source material generates plasma by irradiation with a laser beam, and (E)
The plasma generated by the laser beam irradiation is diffused while being attracted to the laser beam, and spreads inside the air inlet, covering the air inlet.

That is, the apparatus according to the present invention comprises: (A) extracting a laser beam from a laser transmitter mounted on an aircraft;
(B) the laser light from the laser transmitter is guided around the air intake of the aircraft by an optical device; and (C) the laser light guided by the laser transmitter to the plasma source material attached around the air intake. The method is characterized in that the air intake is electromagnetically shielded by irradiating and (D) generated plasma. (Second Means) The air intake shield device using a laser according to the present invention, in the first means, guides a laser beam taken out of the laser transmitter to a vicinity of the air intake with a reflecting mirror. A plurality of light beams are divided by a light beam splitter (beam splitter), and the light source irradiates the plasma source material all at once.

Therefore, the following operation is performed. The plasma source material rapidly heated by the laser light evaporates into plasma and starts moving toward the laser light source.

When this plasma covers the air intake,
The threat radar waves entering the air intake are reflected / attenuated by the plasma, which makes it difficult for the threat radar to catch.

Further, since no structure or the like that obstructs the air flow is required inside the air intake, the pressure recovery of the air intake is good and the flight performance of the aircraft is not impaired.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
2 to FIG. FIG. 1 is an overall configuration diagram of an apparatus according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of the laser transmitter of the apparatus according to the first embodiment of the present invention. As shown in FIG. 1, a laser beam 13 extracted from a laser transmitter 2 mounted on an aircraft 1 is reflected by a reflecting mirror 3 into an air inlet 4.
Is guided to the vibrating mirror 5 attached to the lower end of the mirror.

The laser beam 13 is irradiated on the plasma source material 6 attached to the upper end of the air intake 4 while being swung right and left by the vibrating mirror 5. The plasma source material 6 includes
Any material that generates plasma by laser beam irradiation can be used, but it is preferable to use a metal having good radio wave reflection / absorption characteristics in an ionized state, such as copper.

The plasma generated by the irradiation of the laser beam 13 is diffused while being attracted to the high-temperature laser beam 13, and spreads throughout the inside of the air intake 4.
Cover the entire air intake 4.

When a threat radio wave radiated to the aircraft 1 by a radar or the like enters the inside of the air intake 4, it is attenuated by the plasma generated by the apparatus of the present invention.
The risk of being caught by threat radar is reduced.

Since there are no structures obstructing the air flow inside the air intake 4, the aerodynamic efficiency of the air intake 4 is equivalent to that of the conventional machine without the radio wave reflection reducing device.
There is no decrease in flight performance.

FIG. 2 shows a laser transmitter 2 used in the apparatus of the present invention.
Is shown. The mother machine power supply 7 is connected to a device-side power supply 9 via a control device 8. The power boosted by the transformer 10 is supplied to the electrode 11, and the blower 12
When the CO ₂ gas is supplied during the period of 1, laser emission occurs and a laser beam 13 is generated.

The basic configuration of this apparatus is almost the same as that of an industrial metal cutting laser processing apparatus. (Second Embodiment) FIG. 3 shows a second embodiment of the present invention.
Shown in

In the second embodiment, the air intake 4
Laser transmitter 2 to ensure that the inside of the
The laser beam 13 taken out of the laser beam is guided to the vicinity of the air inlet 4 by the reflecting mirror 3 and then divided into a plurality of beams by a beam splitter (beam splitter) 14. Is irradiated.

[0019]

Since the present invention is configured as described above, it has the following effects. (1) The air intake is electromagnetically shielded by the plasma, and the danger of being captured by the threat radar is reduced. (2) Since there is no mechanism inside the air intake, the aerodynamic efficiency of the air intake is increased and the flight performance is not impaired.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an apparatus according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a laser transmitter of the device according to the first embodiment of the present invention.

FIG. 3 is a conceptual diagram of an apparatus according to a second embodiment of the present invention.

FIG. 4 is a diagram showing an example of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Aircraft 1 2 ... Laser transmitter 2 3 ... Reflecting mirror 3 4 ... Air intake port 4 5 ... Vibrating mirror 5 6 ... Plasma source material 6 7 ... Mother machine power supply 7 8 ... Control device 8 9 ... Device side power supply 9 10 ... Transformer 10 11 Electrode 11 12 Blower 12 13 Laser beam 13 14 Light beam splitter 14 15 Radio wave reflection reduction device 15

Claims (2)

[Claims] 1. A laser transmitter (2) mounted on an aircraft (1), and (B) a laser beam transmitted by the laser transmitter (2) to an air intake (4) of the aircraft. A guiding optical device (3, 5) and (C) a plasma source material (6) mounted around the air intake (4) of the aircraft, and (D) the plasma source material (6) comprises a laser. Plasma is generated by irradiation with the light beam (13), and (E) the plasma generated by irradiation with the laser light beam (13) is diffused while being attracted to the laser light beam (13),
An air inlet shield device using a laser, which covers the air inlet (4) while spreading inside the air inlet (4). 2. A laser beam (13) taken out of a laser transmitter (2) is reflected by a reflecting mirror (3) into an air inlet (4).
2. The method according to claim 1, further comprising: dividing the light into a plurality of light beams by a light beam splitter (14), and irradiating the plasma source material with the light beams at the same time. Air Inlet Shield Device Using Laser