CN113359289A - Anti-laser anti-sniping detection method and device - Google Patents
Anti-laser anti-sniping detection method and device Download PDFInfo
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- CN113359289A CN113359289A CN202110522328.XA CN202110522328A CN113359289A CN 113359289 A CN113359289 A CN 113359289A CN 202110522328 A CN202110522328 A CN 202110522328A CN 113359289 A CN113359289 A CN 113359289A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
- G02B23/10—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors reflecting into the field of view additional indications, e.g. from collimator
- G02B23/105—Sighting devices with light source and collimating reflector
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41G—WEAPON SIGHTS; AIMING
- F41G11/00—Details of sighting or aiming apparatus; Accessories
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Abstract
The invention discloses a laser anti-sniping detection method which is characterized in that a glass window plated with a near-infrared cut-off film is arranged at the optical front end of equipment needing laser anti-detection, and the plane of the glass window and a laser beam emitted by an external laser anti-sniping detector form a certain included angle by adjusting, so that the reflected light of the laser beam falls outside the detectable area of the laser anti-sniping detector. The invention can effectively prevent the cat eye effect and solve the problem that sniping sight glasses, reconnaissance equipment and the like are easy to be actively anti-sniping detected by laser.
Description
Technical Field
The application relates to the technical field of reconnaissance, anti-reconnaissance and the like, in particular to a laser anti-sniping detection method and device.
Background
In the technical field of reconnaissance, particularly in sniping reconnaissance, the existence of the anti-sniping detection device poses great threats to snipers and scouts. Usually, anti-sniping reconnaissance mainly comprises acousto-optic detection, infrared thermal detection and laser active detection; for sniping operation, sound-light detection and infrared heat detection usually occur after sniping occurs, and an anti-sniping means which really threatens a sniper in a latent stage is laser active detection.
The active laser anti-sniping detection adopts the cat eye effect, emits laser beams in invisible wave bands, and receives reflected light by utilizing the principle that a sniping sighting telescope or an observer reflects light, so that the position of a sniper or a reconnaissance person is detected.
At present, conventional sniper sighting telescope and conventional reconnaissance equipment have no effective countermeasures to a laser active anti-sniping detection system, light reflection can be prevented only by closing a sighting telescope lens cover and the like, the sighting and reconnaissance efficiency is greatly limited, and when long-time scanning of the anti-sniping detection system is carried out, the starting of the sniping sighting and reconnaissance is undoubtedly equal to absolute exposure.
Therefore, how to effectively prevent laser anti-sniping detection, improve the safety of sniping observation and reconnaissance, and recover the battlefield operational advantages of snipers becomes important.
Disclosure of Invention
The invention mainly aims to solve the problem that sniping sighting telescope, reconnaissance equipment and the like are easy to be actively anti-sniping detected by laser, and improve the safety of sniping sighting and reconnaissance battles.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the method comprises the steps of installing a glass window plated with a near-infrared cut-off film at the optical front end of equipment needing laser anti-detection, and adjusting the plane of the glass window to form a certain included angle with a laser beam emitted by an external laser anti-sniping detector, so that the reflected light of the laser beam falls outside the detectable area of the laser anti-sniping detector.
According to the technical scheme, the detectable region meets the following constraint conditions:
setting the laser beam divergence angle of a laser anti-sniping detector as theta, the central distance between a laser emission window and a detection CCD window as d, the detection distance of the laser anti-sniping detector as L and the observation angle as beta;
(1) when the front surface or small angle of the laser anti-sniping detector is obliquely observed and is in the field of view of the sighting telescope, the field angle alpha of the detectable area meets | alpha | > (theta + d/L)2, and then reflected light does not enter the detectable area of the anti-sniping detector;
(2) when the laser anti-sniping detector obliquely observes and is outside the field of view of the sighting telescope, the field angle alpha of the detectable area meets | alpha | < beta- (theta + d/L)2, and then reflected light does not enter the detectable area of the anti-sniping detector.
By the technical scheme, the near-infrared cut-off film cuts off the near-infrared light with the wavelength of 750-1200nm, and the average transmittance of the near-infrared band is not higher than 3%.
According to the technical scheme, the near-infrared cut-off film cuts off the near-infrared light with the wave band of 750-1200nm, the cut-off degree of the near-infrared cut-off film is improved by increasing the logarithm of high-refractive index film layers and low-refractive index film layers in a wave stack, and the width of a cut-off band is expanded by stacking waves with different central wavelengths, so that the average transmittance of the near-infrared band is not higher than 0.2%.
According to the technical scheme, the glass window is further plated with a visible light antireflection film.
The invention also provides a detection device for preventing laser anti-sniping, which comprises an outer structural part, a glass window and an adjusting part;
the outer structural component is internally provided with a glass window and is arranged at the optical front end of equipment needing to prevent laser reverse detection;
a near-infrared cut-off film is plated on the glass window;
and the adjusting part is arranged on the outer structural part and used for adjusting the rotation of the glass window to enable the plane of the glass window and a laser beam emitted by the external laser anti-sniping detector to form a certain included angle, so that the reflected light of the laser beam falls outside the detectable area of the laser anti-sniping detector.
According to the technical scheme, the outer structural member is provided with the clamping groove used for clamping the glass window, and the adjusting member is connected with the clamping groove to adjust the clamping angle of the clamping groove.
According to the technical scheme, the glass window is further plated with a visible light antireflection film.
According to the technical scheme, the outer structural part is arranged at the optical front end of the device needing to prevent laser reverse detection in a lens cover mode and can rotate around the axial direction of the optical front end at any angle.
According to the technical scheme, the outer structural part is circular, and the glass window is circular.
By adopting the technical scheme, the visible light antireflection film can transmit visible light with the wavelength of 400-700nm, the average transmittance of the visible light is not lower than 97.5%, the near-infrared cut-off film can cut off near-infrared light with the wavelength of 750-1200nm, and the average transmittance of the near-infrared band is not higher than 3%.
By the technical scheme, the near-infrared cut-off film cuts off the near-infrared light with the wavelength of 750-1200nm, and the average transmittance of the near-infrared band is not higher than 0.2%.
According to the technical scheme, the adjusting piece is an adjusting knob.
According to the technical scheme, the near-infrared cut-off film body improves the cut-off degree by increasing the logarithm of the high-refractive-index film layer and the low-refractive-index film layer in the wave stack, and expands the width of a cut-off band by stacking waves with different central wavelengths.
According to the technical scheme, the outer structural part is arranged at the optical front end of the device needing to prevent laser reverse detection in a lens cover mode and can rotate around the axial direction of the optical front end at any angle.
According to the technical scheme, the structure of the near-infrared cut-off film system is as follows: sub 0.24H 0.31L 1.89H 0.41L 0.27H 0.87L 0.50H 0.20L 1.16H 0.99L.
According to the technical scheme, the film system structure of the visible light antireflection film is as follows: sub 0.13H 0.34L 1.51H 1.50L 1.49H 1.53L 1.52H 1.54L 1.52H 1.54L 1.53H 1.54L 1.54H 1.54L 1.55H 1.52L 1.55H 1.54L 1.54H 1.55L 1.52H 1.54L 1.50H 1.53L 1.50H 1.46L 1.34H 1.30L 1.25H 1.29L 1.22H 1.35L 1.40H 1.48L 1.46H 1.46L 1.45H 1.48L 1.41H 1.38L 1.24H 1.24L 1.20H 1.20L 1.16H 1.20L 1.13H 1.18L 1.12H 1.17L 1.11H 1.1.17L 1.11H 1.1.1.1.1.1H 1.1.1.1H 1.1.1.1.1.1.1.17L 1.11H 1.1.1.1.1.1H 1.1.1H 1.1.1.1.1.1H 1.1.17L 1.1.1.1.1H 1.1.1.1.1.1.17H 1.1.1.1.1.1.1.1.1.1H 1.1.1.1.1.1.1.1.1.1.1.1.1H 1.1H 1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1H 1H 1.1.1.1.1.1.1.1.1.1.1.1.1H 1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.17H 1.1.1.1.1.1.1.1.1.17H 1.1.1.1.1.1.1.1.1H 1.1.1.1.1.1.1.1.1.1H 1H 1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1H 1.1.1.1.1.1.1.1.1.1.1.1H 1.1.1.1H 1H 1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.
According to the technical scheme, the device needing to prevent laser reverse detection is a sighting telescope or a viewer.
The invention has the following beneficial effects: according to the invention, the glass window plated with the near-infrared cut-off film is arranged at the optical front end of the device needing laser anti-sniping detection, and the plane of the glass window and the laser beam emitted by the external laser anti-sniping detector are regulated to form a certain included angle, so that the reflected light of the laser beam falls outside the detectable area of the laser anti-sniping detector, and finally, the laser anti-sniping detection is effectively prevented.
The anti-laser-anti-sniping detection device is also arranged at the front end of equipment needing anti-laser-anti-detection, such as the front end of a sighting telescope or an observation instrument, in an easy-to-assemble and disassemble mode, the plane of the glass window forms a certain included angle with a laser beam emitted by an external laser-anti-sniping detection instrument through the adjusting part, the glass window is highly transparent to visible light and strictly cut off near infrared, and finally, the anti-laser-sniping detection is effectively prevented.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic view of the working principle of "cat-eye effect";
FIG. 2a is a front view of the laser anti-sniper detection device according to the embodiment of the invention;
FIG. 2b is a partial sectional view of the laser anti-sniper detection device according to the embodiment of the invention, which is mounted on other equipment;
FIG. 3 is a graph of the transmittance of a glass window with high visible light transmission and a strict near infrared cutoff;
FIG. 4 is a schematic view of the laser anti-sniper detector during front detection;
fig. 5 is a schematic view of the laser anti-sniping detector during inclination detection.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the present embodiment illustrates the basic working principle of laser anti-sniping detection. The laser anti-sniping detection is realized by emitting laser, which is usually invisible near-infrared band laser (such as 808nm, 910nm and the like) to a detected area, when the laser beam irradiates a sniping gun sighting telescope or an observation instrument optical system lens, due to the cat eye effect, the incident laser converges on an imaging focal plane and returns along a route approximately parallel to the incident laser, so that the laser is detected by a CCD on the laser anti-sniping detection instrument.
Due to the cat eye effect and safety considerations, anti-sniping detection observers usually do not need to be and are not suitable to be directly in front of the sniper gun sighting telescope or in the observation field, otherwise the anti-sniping detection observers are very easy to find by snipers. In addition, due to the detection sensitivity, the reflected laser energy returned along the original route can be detected after reaching about 3% -5% (different due to different sensitivities of the laser anti-sniping detector).
In order to prevent anti-sniping detection, in the method for detecting anti-laser anti-sniping, the glass window plated with the near-infrared cut-off film is installed at the optical front end of the device needing anti-laser anti-sniping detection, and the plane of the glass window and a laser beam emitted by an external laser anti-sniping detector are adjusted to form a certain included angle, so that the reflected light of the laser beam falls outside the detectable area of the laser anti-sniping detector, and at the moment, an enemy cannot detect any sniping device through the laser anti-sniping detector, so that anti-sniping detection can be effectively prevented.
Specifically, the near-infrared cut-off film cuts off the near-infrared light of 750-1200nm waveband, and the average transmittance of the near-infrared waveband is not higher than 3%.
The near-infrared cut-off film body improves the cut-off degree by increasing the logarithm of high-refractive index film layers in a wave stack, expands the width of a cut-off band by stacking waves with different central wavelengths, and can enable the average transmittance of a near-infrared band to reach about 0.2 percent or even lower in a preferred embodiment of the invention.
In order not to affect the light transmittance of the sniping gun sighting telescope, in a preferred embodiment of the invention, a visible light antireflection film is further coated on the glass window, the antireflection film can transmit visible light in the 400-and 700-nm wave band, the average transmittance of the visible light is not lower than 97.5%, and the observation of the sniping gun sighting telescope can be effectively guaranteed to be hardly affected.
Further, the detectable region satisfies the following constraint:
and setting the laser beam divergence angle of the laser anti-sniping detector as theta, the central distance between the laser emission window and the detection CCD window as d, the detection distance of the laser anti-sniping detector as L and the observation angle as beta.
(1) As shown in fig. 4, when the laser anti-sniping detector performs front or small-angle oblique observation (in the field of view of the sighting telescope), the field angle α of the detectable region should satisfy | α | > (θ + d/L)2, so that the reflected light can be ensured not to enter the anti-sniping detector;
(2) as shown in fig. 5, when the laser anti-sniper detector is obliquely observed and outside the field of view of the sighting telescope, the field angle α of the detectable region should satisfy | α | < β - (θ + d/L) 2.
Further, in a special case, α is 0.
The detectable regions are further described below with reference to specific parameters.
Taking a typical laser anti-sniping detector as an example, a laser band is 808nm or 910nm, a laser beam divergence angle is 0.3-2.7 mrad unequal or adjustable, a laser action distance is 100-1500 m, a distance between a laser window and the center of an observation CCD window is 30mm, a sniping gun view field is 1.5 degrees, and under the condition that a special case alpha is 0, the laser anti-sniping detector is combined with a figure 4, the following steps are provided:
the laser anti-sniping detector can detect that the angle of the laser beam is (theta + d/L)2, and according to specific parameters, maximum values are as follows:
(1) when the action distance is 100m, the laser anti-sniping detector can detect the maximum value of the angle of the laser beam to be (2.7+30/100)2 to be 1.5mrad, and the corresponding detectable area radius is 1.5 m.
(2) When the working distance is 1500m, the laser anti-sniping detector can detect the maximum angle value of the laser beam as (2.7+30/1500)2 which is 1.36mrad, and the corresponding detectable area radius is 2.04 m.
Therefore, when the axis of the laser anti-sniping detection device is aligned to the sky, the ground or other directions which cannot be arranged for anti-sniping observers and avoid the circle range with the radius of 2.04m in the directions, the laser anti-sniping detection can be realized.
The method can be applied to sighting telescope, observation instrument and other occasions needing laser anti-reflection detection according to actual requirements.
As shown in fig. 2a and 2b, in one embodiment of the invention, the laser anti-sniping detection device mainly comprises an outer structural member 10, a glass window 20 and an adjusting member 30.
A glass window 20 is arranged in the outer structural part 10, and the outer structural part 10 is arranged at the optical front end of equipment needing to prevent laser reverse detection; the glass window 20 is plated with a near-infrared cut-off film; and the adjusting part 30 is arranged on the outer structural part 10, and is used for adjusting the glass window 20 to rotate, so that a certain included angle is formed between the plane of the glass window and a laser beam emitted by an external laser anti-sniping detector, and the reflected light of the laser beam falls outside the detectable area of the laser anti-sniping detector.
Wherein the near infrared cut-off film strictly cuts off near infrared light of 750-1200nm waveband, the average transmittance of the near infrared waveband is not higher than 3%, and the average transmittance of the near infrared waveband in the preferred embodiment of the invention can reach about 0.2%.
In order not to affect the light transmittance of the sniping gun sight, in the preferred embodiment of the invention, the glass window 20 is further coated with a visible light antireflection film, the antireflection film can transmit visible light in the 400-plus 700nm band, the average transmittance of the visible light is not lower than 97.5%, and the sniping gun sight can be effectively ensured to be hardly affected in observation.
The device is installed at the optical front end (such as the front end of a sighting telescope or an observation instrument) of equipment needing laser anti-sniping prevention through an easy dismounting mode, arbitrary angle adjustment of a glass window is achieved through an adjusting part, a certain included angle is formed between the device and a laser anti-sniping detection instrument, and finally laser anti-sniping detection is effectively prevented.
Specifically, the outer structural member 10 of the embodiment of the present invention is mounted on the optical front end of the device that needs to prevent laser reverse detection in a lens cover manner, so that convenient installation and detachment can be realized.
Further, the outer structural member 10 can rotate around the optical system of the device needing to prevent laser anti-detection at any angle in the axial direction, and then the glass window is adjusted by the adjusting member to rotate around the optical system in the radial direction, so that a certain included angle can be formed between the plane of the glass window 20 and a laser beam emitted by an external laser anti-sniping detector.
Specifically, in the embodiment of the present invention, the outer structural member 10 is a circular ring, the glass window 20 is a circular flat glass, and the outer structural member 10 is provided with a clamping slot 11 for clamping the glass window 20. The adjusting piece 10 is connected with the clamping slot 11, and can adjust the clamping angle of the clamping slot 11.
Further, as shown in fig. 3, the glass window 10 with high visible light transmittance and strict near-infrared cutoff may use tantalum oxide and silicon oxide as high and low refractive index materials, and by disposing a near-infrared cutoff film and a visible light antireflection film on the transparent substrate layer, the near-infrared cutoff film and the visible light antireflection film may independently include a plurality of dual units, each of which includes a high refractive index material layer and a low refractive index material layer opposite thereto. By optimizing the film thickness, flattening the pass band, adopting an electron beam evaporation ion assisted deposition technology on a plating process, applying an optical film thickness monitoring method, monitoring the wavelength of 690nm, combining a real-time online correction technology, compensating the film thickness error according to the peak-valley position deviation, accurately setting a plating stop point, and finally realizing strict cut-off of a near-infrared band, wherein the average transmittance of the near-infrared band is 0.2 percent and is far lower than the detected energy ratio of about 3-5 percent.
Furthermore, the silicon oxide and the tantalum oxide are both made of ring materials, and the tantalum oxide must be fully pre-melted before being plated, so that the purpose of the method is to keep the stable speed in the plating process, enhance the stability of a light-operated signal and ensure the accurate positioning of a plating stop point. The deposition temperature is set to be 200 ℃, the wall of the vacuum chamber is covered by a water-cooling guard plate, and the temperature of the substrate is kept stable during long-time evaporation. The silicon oxide deposition rate is 0.7nm/s, the oxygen charging amount of the ion source is 20sccm, and the gas pressure during deposition is controlled at 2X 10-4mBar; the deposition rate of tantalum oxide is 0.3nm/s, the oxygen charging amount of the ion source is 30sccm, and the gas pressure during deposition is controlled at 3X 10-4mBar。
Further, in a preferred embodiment of the present invention, the film system structure of the near-infrared cut-off film is: sub 0.24H 0.31L 1.89H 0.41L 0.27H 0.87L 0.50H 0.20L 1.16H 0.99L.
Further, in a preferred embodiment of the present invention, the film system structure of the near-infrared cut-off film is: sub 0.24H 0.31L 1.89H 0.41L 0.27H 0.87L 0.50H 0.20L 1.16H 0.99L, visible light antireflection film system structure: sub 0.13H 0.34L 1.51H 1.50L 1.49H 1.53L 1.52H 1.54L 1.53H 1.54L 1.54H 1.54L 1.55H 1.52L 1.55H 1.54L 1.54H 1.54L 1.55H 1.55L 1.52H 1.54L 1.50H 1.53L 1.50H 1.46L 1.34H 1.30L 1.25H 1.29L 1.22H 1.35L 1.40H 1.48L 1.46H 1.46L 1.45H 1.48L 1.41H 1.38L 1.24H 1.24L 1.20H 1.20L 1.16H 1.20L 1.13H 1.18L 1.12H 1.17L 1.17H 1.11H 1.17L 1.17H 1.1.1.1.1L 1.24H 1.24L 1.20H 1.1.1.18L 1.12H 1.17H 1.1.17H 1.1.1.17H 1.1.1.1.17H 1.1.1.1.1.1.1.1.17H 1.1.17H 1.1.1.1.17H 1.1.1.17H 1.1.1.1.17H 1.1.1.1.1.1.1.1.1.17H 1.1.17H 1.1.1.17H 1.1.1.1.17H 1.1.17H 1.17H 1.1.1.1.1.1.17H 1.1.17H 1.1.1.1.1.17H 1.1.1.1.1.1.1.1.1.1.1.1.1.17H 1.17H 1.1.17H 1.17H 1.1.1.1.1.1.1.17H 1.1.1.17H 1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.17H 1.1.1.17H 1.17H 1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.17H 1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.17H 1.1.1.1.1.1.1.1.1.1.17H 1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1., finally, the designed film is at 750-1200nm and the average transmittance is about 0.2%.
Furthermore, the optical thickness of the silicon oxide film layer is relatively thin on the 68 th layer, and if the optical film thickness is adopted for monitoring, the light control quantity is changed too little, and the monitoring error is relatively large, so that the 68 th layer adopts the crystal for monitoring the physical thickness, the other film layers adopt the optical film thickness for monitoring, and the monitoring wavelength is set to be 710 nm.
Specifically, the adjusting part 30 is an adjusting knob, and the angle of the glass window is rotated by changing the clamping angle of the clamping slot 11, so that a certain included angle is formed between the adjusting knob and a laser beam emitted by the laser anti-sniping detector, and the reflected laser is not in a detectable area.
The laser anti-sniping detection device provided by the embodiment of the invention is mainly used for realizing the laser anti-sniping detection method provided by the embodiment, so that the structure of the detection device can be subjected to various deformation and replacement, and the detection device is not limited by examples.
The following is a further description with reference to specific application examples.
The sniper can be erected, because the emitted laser can be returned and received when the anti-sniping observer is positioned on the axis of the device, and the emitted laser cannot be received when the anti-sniping observer is positioned at any other position and angle (outside the detectable region), the anti-sniping detection cannot be realized.
In conclusion, the detection method for preventing laser anti-sniping realizes the adjustment of any angle of the glass window through the adjusting part, forms a certain included angle with the laser anti-sniping detector, can effectively prevent the cat eye effect, and solves the problem that sniping sight glasses, reconnaissance equipment and the like are easy to be actively detected by laser anti-sniping.
It should be understood that modifications and variations of the specific implementation and implementation forms according to the above-described method may be made by those skilled in the art, and all such modifications and variations are intended to fall within the scope of the appended claims.
Claims (10)
1. The detection method is characterized in that a glass window plated with a near-infrared cut-off film is installed at the optical front end of equipment needing laser anti-detection, and the plane of the glass window and a laser beam emitted by an external laser anti-sniping detector form a certain included angle, so that the reflected light of the laser beam falls outside the detectable area of the laser anti-sniping detector.
2. The detection method for preventing laser anti-sniping according to claim 1, wherein the detectable region meets the following constraint conditions:
the laser beam divergence angle of the laser anti-sniping detector is set as
The center distance between the laser emission window and the detection CCD window is
Laser anti-sniping detectorsA detection distance of
An observation angle of
；
(1) When the laser anti-sniping detector is observed in front or at a small angle in an inclined way and is in the field of view of the sighting telescope, the field angle of the detectable region
Satisfy the requirement of
If the reflected light does not enter the detectable area of the anti-sniping detector, the reflected light does not enter the detectable area of the anti-sniping detector;
(2) when the laser anti-sniping detector obliquely observes and is outside the field of view of the sighting telescope, the visual angle of the detectable region
Satisfy the requirement of
The reflected light does not enter the detectable area of the anti-sniping detector.
3. The laser anti-sniping detection method as claimed in claim 1, wherein the near infrared cut-off film cuts off the near infrared light in the 750-1200nm band, and the average transmittance of the near infrared band is not higher than 3%.
4. The laser anti-sniping detection method as claimed in claim 1, wherein the near infrared cut-off film cuts off the near infrared light in the 750-1200nm band, the cut-off degree of the near infrared cut-off film is increased by increasing the logarithm of the high and low refractive index film layers in the wave stack, and the width of the cut-off band is expanded by stacking the waves with different central wavelengths, so that the average transmittance of the near infrared band is not higher than 0.2%.
5. The detection method for preventing laser anti-sniping as claimed in claim 1, wherein the glass window is further coated with a visible light antireflection film.
6. The detection device for preventing laser anti-sniping is characterized by comprising an outer structural part, a glass window and an adjusting part;
the outer structural component is internally provided with a glass window and is arranged at the optical front end of equipment needing to prevent laser reverse detection;
a near-infrared cut-off film is plated on the glass window;
and the adjusting part is arranged on the outer structural part and used for adjusting the rotation of the glass window to enable the plane of the glass window and a laser beam emitted by the external laser anti-sniping detector to form a certain included angle, so that the reflected light of the laser beam falls outside the detectable area of the laser anti-sniping detector.
7. The laser anti-sniping detection device as claimed in claim 6, wherein the outer structural member is provided with a clamping slot for clamping the glass window, and the adjusting member is connected with the clamping slot for adjusting the clamping angle of the clamping slot.
8. The laser anti-sniper detection device as claimed in claim 6, wherein the glass window is further coated with a visible light antireflection film.
9. The laser anti-sniper detection device as claimed in claim 6, wherein the outer structural member is mounted to the optical front end of the device to be protected against laser anti-detection in the form of a lens cap and is rotatable around the optical front end axially by any angle.
10. The laser anti-sniper detection device as claimed in claim 6, wherein the outer structural member is annular and the glass window is circular.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203587880U (en) * | 2013-11-14 | 2014-05-07 | 宋建红 | Periscopic snipe sighting telescope |
| CN106197147A (en) * | 2016-08-25 | 2016-12-07 | 河南华阳装备制造有限公司 | Multi-functional slewing firearms gun sight |
| CN207439261U (en) * | 2017-04-05 | 2018-06-01 | 珠海天羿精密仪器有限公司 | A kind of Multifunctional aiming mirror |
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- 2021-05-13 CN CN202110522328.XA patent/CN113359289B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203587880U (en) * | 2013-11-14 | 2014-05-07 | 宋建红 | Periscopic snipe sighting telescope |
| CN106197147A (en) * | 2016-08-25 | 2016-12-07 | 河南华阳装备制造有限公司 | Multi-functional slewing firearms gun sight |
| CN207439261U (en) * | 2017-04-05 | 2018-06-01 | 珠海天羿精密仪器有限公司 | A kind of Multifunctional aiming mirror |
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