RU46591U1 - PERISCOPIC ADJUSTABLE TO LASER RANGE LPR-1 (1D13) FOR PROTECTION AGAINST LASER RADIATION - Google Patents

Abstract

The invention relates to quantum electronics and can be used in laser technology to protect military optoelectronic devices and the organs of vision of operators from laser radiation. The purpose of the invention is the protection from fragments and reducing the power of laser radiation to a safe level for the organs of vision of the operator and the device LPR-1 (1 D 13) at various levels of laser radiation. The periscope tip includes:

- protective wedge-shaped glass;

- upper and lower mirror, characterized by the thickness of the film coating;

- volumetric interference filter;

- protective glass, covers for mounting mirrors in the nozzle;

- nozzle body.

The periscopic nozzle does not alter the design of the existing LPR-1 laser rangefinder (1 D 13) and, when operating in the normal mode, has a slight effect on its operation, associated with a slight decrease in light transmission, mainly due to light loss in the filter.

The periscope tip allows reconnaissance from cover, protects the operators' vision and the device from laser radiation of various powers and reduces the level of the signal reflected from the device, reducing the likelihood of direction finding by the laser locator and guiding the guided munition along the laser beam. The periscope tip is assembled and tested in laboratory conditions. As the upper and lower protective mirrors, an aluminum film of various thicknesses with a protective SiO ₂ film on a K8 glass substrate was used. OS 23-1 glass with an integrated transmittance τ _λ = 0.15 ... 0.19 for radiation from an optical quantum generator λ = 0.53 μm was used as an filter with an interference coating. Measurements showed that the degree of reduction in laser radiation power is A = P _o / P _in = 0.02.

Description

The invention relates to quantum electronics and can be used in laser technology to protect military optoelectronic devices and the organs of vision of operators from laser radiation.

The laser range finder LPR-1 (1 D 13) is one of the main artillery reconnaissance devices. However, he does not allow reconnaissance from cover. This makes rangefinder operators vulnerable to splinters. The rangefinder is not designed to protect the receiving visual channel (operator’s organs of vision) from laser radiation. The position of the laser rangefinder can be detected by reflected laser radiation (glare) with a laser locator. Guided munition can be induced through the laser beam.

Currently, various periscope attachments (for example, the periscope attachment to the PAB-2 compass, etc.) are used to conduct surveillance due to shelter in artillery reconnaissance devices.

Interference and polarization filters, dampers (controlled and uncontrolled) and shutters, including phototropic ones, are used to protect the devices and organs of vision of the operators from laser radiation.

These tools mainly provide protection only from low-power laser radiation.

The purpose of the invention is the protection against fragments and reducing the power of laser radiation to a safe level for the organs of vision of the operator and the device at different levels of radiation.

The figure 1 presents the optical scheme of the periscopic nozzle. Figure 2 is a graph of a laser attenuation device.

The periscope tip consists of:

1 - protective wedge-shaped, ("anti-glare") glass;

2, 3 - upper and lower mirrors, characterized by the thickness of the film coating, sensitive to the effects of respectively high-power and medium laser radiation;

4 - volumetric interference filter that protects against weak laser radiation;

5 - protective glass;

6, 7 - covers for mounting mirrors in the nozzle (for replacing failed mirrors);

8 - a flange of fastening of a periscopic nozzle to the device

9 - the periscope nozzle body.

Mirrors 2 and 3 at a low radiation intensity work to reflect (up to 99.9%) the incident light. At a high radiation intensity in the material of the mirror coatings, energy is converted

laser radiation (as a result of absorption at the atomic-molecular level) into thermal energy, which leads to heating of the substance to a high temperature and to the destruction of mirror coatings. The difference in the thickness of the coatings of the mirrors determines their response to the radiation power.

The parameters of the interference filter 4 can be selected to attenuate the radiation of periscopic lasers at wavelengths of 0.53; 1.06; 10.6 microns.

The periscopic nozzle does not change the design of the existing laser rangefinder LPR-1 (1 D 13).

The device operates as follows.

When operating in the normal rangefinder mode, the periscope tip has a slight effect on its operation, associated with a slight decrease in light transmission, mainly due to light loss in the filter 4.

The effect of low-power laser radiation W _{1 is} absorbed by interference filter 4 to a safe level.

More powerful laser radiation W ₂ causes thermal destruction of the reflective layer of the mirror coating of the mirror 3 “Breakdown” of the thin mirror layer of the aluminum film occurs, as a result of which the power of W _{2 is} significantly attenuated. Part of the laser radiation W ₁ , which fell on the undestroyed portion of the mirror 3, is attenuated to a safe level by the light filter 4.

High-power laser radiation W _{3 is} attenuated first by mirror 2 (“breakdown” of the film occurs) to level W ₂ , and then by mirror 3 to level W ₁ , after which it is reduced to a safe level by filter 4.

The laser radiation transmitted through the interference filter 4 is reflected from the optoelectronic elements of the device and is again attenuated by the filter. Therefore, the signal reflected from the device has a low power, not sufficient for direction finding by the laser locator of the device.

The periscopic nozzle allows reconnaissance from cover, protects the range finder from fragments, protects the operators' vision and the device from laser radiation of various powers and reduces the level of the signal reflected from the device, reducing the likelihood of its direction finding by the laser locator and guidance of the guided munition along the laser beam.

As the upper and lower protective mirrors, an aluminum film A1 of various thicknesses with a protective film of SiO ₂ on a K8 glass substrate was used. An OS 23-1 glass with an integrated transmittance τ _λ = 0.15 ... 0.19 for radiation from an optical quantum generator λ = 0.53 μm was used as an filter with an interference coating.

The measurements showed that the degree of decrease in the radiation power by the periscopic nozzle is A = P _o / P _in = 0.02.

Claims (1)

Periscope nozzle for laser range finder LPR-1 (1D13) for protection against laser radiation containing two mirrors, a volume interference filter, a protective glass and a housing, characterized in that the reduction of various levels of laser radiation power is carried out when it passes through an interference filter made of glass OS 23-1 with an integrated transmittance τλ = 0.15 ... 0.19 and through two mirrors in which the breakdown of a thin mirror layer made of a thin aluminum film occurs.