阅读说明：本技术 一种激光红外复合目标模拟器光学系统 (Optical system of laser infrared composite target simulator ) 是由 李婷 刘家国 于 2021-01-04 设计创作，主要内容包括：本发明涉及一种激光红外复合目标模拟器光学系统,包括激光器、黑体、激光匀光镜组、红外中继镜、合束镜、目标光阑和准直镜组,激光匀光镜组放置在激光器信号输出端,红外中继镜放置在黑体放射输出端,合束镜放置在激光匀光镜组和红外中继镜的输出汇集处,合束镜输出端外放置目标光阑,准直镜组放置在目标光阑输出端处,本发明具有可用于激光/红外复合目标模拟器设备研制,实现激光/红外双模导引头的半实物仿真测试的优点。(The invention relates to an optical system of a laser-infrared composite target simulator, which comprises a laser, a black body, a laser dodging mirror group, an infrared relay mirror, a beam combining mirror, a target diaphragm and a collimating mirror group, wherein the laser dodging mirror group is arranged at a signal output end of the laser, the infrared relay mirror is arranged at a radiation output end of the black body, the beam combining mirror is arranged at an output convergence position of the laser dodging mirror group and the infrared relay mirror, the target diaphragm is arranged outside the output end of the beam combining mirror, and the collimating mirror group is arranged at the output end of the target diaphragm.)

1. An optical system of a laser infrared composite target simulator is characterized in that: including laser instrument (1), black body (2), even optical mirror group of laser (3), infrared relay (4), beam combining mirror (5), target diaphragm (6) and collimating mirror group (7), even optical mirror group of laser (3) are placed at laser instrument (1) signal output part, infrared relay (4) are placed at black body (2) radiation output end, the output that places at even optical mirror group of laser (3) and infrared relay (4) of beam combining mirror (5) is converged and is located, place target diaphragm (6) outside beam combining mirror (5) output, collimating mirror group (7) are placed at target diaphragm (6) output end department.

2. The laser infrared composite target simulator optical system of claim 1, characterized in that: the laser dodging mirror group (3) comprises a laser collimating mirror (31), a lens array (32), an attenuation sheet (33), a converging lens (34), a right-angle reflecting mirror (35), a holographic diffusion sheet (36) and a laser relay mirror (37), wherein the laser collimating mirror (31) is arranged outside the output end of a laser (1), the lens array (32) is arranged at the output end of the laser collimating mirror (31), the attenuation sheet (33) is arranged at the output end of the lens array (32), the converging lens (34) is arranged at the output end of the attenuation sheet (33), the right-angle reflecting mirror (35) is arranged at the output end of the converging lens (34), the holographic diffusion sheet (36) is arranged at the output end of the right-angle reflecting mirror (35), the laser relay mirror (37) is arranged at the output end of the holographic diffusion sheet (36), and the output end of the laser relay mirror (37) is.

3. The laser infrared composite target simulator optical system of claim 2, characterized in that: the number of the attenuation sheets (33) is two, and the transmittance of the two attenuation sheets (33) is adjusted within the range of OD 1-OD 3.

4. The laser infrared composite target simulator optical system of claim 3, characterized in that: the number of the right-angle reflecting mirrors (35) is two, and the inclined surfaces of the right-angle reflecting mirrors (35) are opposite to each other so as to fold the light path.

5. The laser infrared composite target simulator optical system of claim 1, characterized in that: the infrared relay lens (4) adopts an aspheric germanium lens with a focal length of 25mm and a caliber of 25mm, and the vertical axis magnification of the infrared relay lens (4) is-1.

6. The laser infrared composite target simulator optical system of claim 1, characterized in that: the base material of the beam combining mirror (5) is zinc selenide or zinc sulfide single crystal, and the front surface and the back surface of the beam combining mirror (5) are coated with films.

7. The laser infrared composite target simulator optical system of claim 1, characterized in that: the collimating lens group (7) comprises a plane reflector (71) and an off-axis parabolic reflector (72), the plane reflector (71) is arranged at the output end of the target diaphragm (6), the off-axis parabolic reflector (72) is arranged at the output end of the plane reflector (71), and the off-axis parabolic reflector (72) outputs parallel laser.

8. The laser infrared composite target simulator optical system of claim 1, characterized in that: the reflecting surfaces of the plane reflector (71) and the off-axis parabolic reflector (72) are both plated with gold films, wherein the off-axis angle theta of the off-axis parabolic reflector (72) is 20 degrees.

Technical Field

The invention relates to the technical field of analog optical systems, in particular to an optical system of a laser infrared composite target simulator.

Background

The precision guided weapon has become a light weapon in modern war, and the seeker plays a vital role as the 'eye' of the precision guided weapon. With the development of the technology, the seeker with single-mode guidance cannot meet the requirement of accurate guidance in a complex battlefield, and the composite guidance combines two or more guidance modes together to play the advantages of the two or more guidance modes, effectively resist various interferences in the battlefield environment and improve the guidance accuracy, and is the trend of future technical development.

At present, a great deal of research is carried out on a laser/infrared composite seeker by a plurality of research units at home and abroad, but in view of the short research time on the laser/infrared dual-mode seeker at home, no mature target simulation matching test equipment for the semi-physical simulation test of the laser/infrared composite seeker exists at present. Therefore, in view of the above disadvantages, it is desirable to provide a laser infrared composite target simulator optical system.

Disclosure of Invention

Technical problem to be solved

The invention aims to solve the technical problem that no mature related matched test equipment for semi-physical simulation test of a laser/infrared dual-mode seeker exists at present.

(II) technical scheme

In order to solve the technical problem, the invention provides an optical system of a laser infrared composite target simulator, which comprises a laser, a black body, a laser dodging mirror group, an infrared relay mirror, a beam combining mirror, a target diaphragm and a collimating mirror group, wherein the laser dodging mirror group is arranged at a signal output end of the laser, the infrared relay mirror is arranged at a radiation output end of the black body, the beam combining mirror is arranged at an output convergence position of the laser dodging mirror group and the infrared relay mirror, the target diaphragm is arranged outside an output end of the beam combining mirror, and the collimating mirror group is arranged at an output end of the target diaphragm.

As a further description of the present invention, preferably, the laser dodging mirror group includes a laser collimating mirror, a lens array, an attenuating plate, a converging lens, a right-angle reflecting mirror, a holographic diffusing plate and a laser relay mirror, the laser collimating mirror is disposed outside the output end of the laser, the lens array is disposed at the output end of the laser collimating mirror, the attenuating plate is disposed at the output end of the lens array, the converging lens is disposed at the output end of the attenuating plate, the right-angle reflecting mirror is disposed at the output end of the converging lens, the holographic diffusing plate is disposed at the output end of the right-angle reflecting mirror, the laser relay mirror is disposed at the output end of the holographic diffusing plate, and the.

As a further explanation of the present invention, it is preferable that the number of the attenuation sheets is two, and the transmittances of the two attenuation sheets are adjusted within the range of OD1 to OD 3.

As a further explanation of the present invention, it is preferable that the number of the corner mirrors is two, and the slopes of the corner mirrors are opposite to each other so as to fold the optical path.

As a further explanation of the invention, preferably, the infrared relay lens adopts a piece of aspheric germanium lens with a focal length of 25mm and a caliber of 25mm, and the vertical axis magnification of the infrared relay lens is-1.

As a further description of the present invention, it is preferable that the substrate material of the beam combiner is zinc selenide or zinc sulfide single crystal, and both the front and back surfaces of the beam combiner are coated with films.

As a further description of the present invention, preferably, the collimating mirror group includes a planar mirror and an off-axis parabolic mirror, the planar mirror is disposed at the output end of the target diaphragm, the off-axis parabolic mirror is disposed at the output end of the planar mirror, and the off-axis parabolic mirror outputs the parallel laser.

As a further explanation of the present invention, it is preferable that the reflecting surfaces of the plane mirror and the off-axis parabolic mirror are both plated with a gold film, wherein the off-axis angle θ of the off-axis parabolic mirror is 20 °.

(III) advantageous effects

The technical scheme of the invention has the following advantages:

the laser/infrared composite target simulator is used for compounding the laser/infrared through the optical system of the laser/infrared composite target simulator so as to simulate the laser scattered by the target and the infrared radiation of the target, has the capability of simulating the laser scattering power change of the target and the function of simulating targets with different sizes, shapes and infrared radiation intensities, can also simulate the characteristics of the target such as the motion direction, the speed, the acceleration and the like by matching with the turntable, can be used for developing laser/infrared composite target simulator equipment and realizes the semi-physical simulation test of the laser/infrared dual-mode seeker.

Drawings

FIG. 1 is a diagram of an optical system of the present invention;

FIG. 2 is a light path diagram of the laser dodging mirror group of the present invention;

FIG. 3 is an imaging optical path diagram of an infrared relay lens of the present invention;

FIG. 4 is a laser spot pattern on a holographic diffuser of the present invention;

fig. 5 is a laser spot at the target stop of the present invention.

In the figure: 1. a laser; 2. a black body; 3. a laser dodging lens group; 31. a laser collimating mirror; 32. a lens array; 33. an attenuation sheet; 34. a converging lens; 35. a right angle mirror; 36. a holographic diffuser; 37. a laser relay lens; 4. an infrared relay lens; 5. a beam combining mirror; 6. a target diaphragm; 7. a collimating lens group; 71. a plane mirror; 72. an off-axis parabolic reflector.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

An optical system of a laser infrared composite target simulator is shown in figure 1 and comprises a laser 1, a black body 2, a laser dodging mirror group 3, an infrared relay lens 4, a beam combining mirror 5, a target diaphragm 6 and a collimating mirror group 7, wherein the laser dodging mirror group 3 is arranged at a signal output end of the laser 1, the infrared relay lens 4 is arranged at a radiation output end of the black body 2, the beam combining mirror 5 is arranged at an output convergence position of the laser dodging mirror group 3 and the infrared relay lens 4, the target diaphragm 6 is arranged outside an output end of the beam combining mirror 5, and the collimating mirror group 7 is arranged at an output end of the target diaphragm 6.

With reference to fig. 1 and 2, the spectral range of the laser 1 can be selected from 1.06 μm and 1.57 μm, the pulsed laser emitted by the laser 1 irradiates into the laser dodging mirror group 3, the laser dodging mirror group 3 includes a laser collimating mirror 31, a lens array 32, an attenuation sheet 33, a converging lens 34, a right-angle reflector 35, a holographic diffusion sheet 36 and a laser relay lens 37, the laser collimating mirror 31 is arranged outside the output end of the laser 1, the laser collimating mirror 31 is a double-cemented lens with a focal length of 40mm and a caliber of 25mm, the laser collimating mirror collimates the pulsed laser with a numerical aperture of 0.14, and the collimated light spot diameter D is equal to the collimated light spot diameter₁0.14 × 40 × 2 ═ 11.3 mm. The lens array 32 is arranged on the output of the laser collimating lens 31At the output end, the single lens radius R of the lens array 32 is 20mm, the number of lenses is 7 × 9(x direction × y direction), and the center-to-center distance between lenses in the y direction is 4 mm. The attenuation sheets 33 are arranged at the output end of the lens array 32, the number of the attenuation sheets 33 is two, the attenuation sheets are used for attenuating laser energy, and the transmittance of the attenuation sheets is adjustable from OD1 to OD 3. The converging lens 34 is arranged at the output end of the attenuation sheet 33, the focal length of the converging lens 34 is 120.8mm, the size of a uniform irradiation surface of an exit pupil surface after the converging lens 34 focuses is 12.4 multiplied by 9.4mm, and the divergence angle is 3.8 degrees. The right-angle reflectors 35 are arranged at the output end of the convergent lens 34, the number of the right-angle reflectors 35 is two, the inclined surfaces of the right-angle reflectors 35 are opposite, and the calibers of the right-angle reflectors 35 are 25mm, so that the light path can be folded. A holographic diffuser 36 is placed at the output end of the cube mirror 35, the holographic diffuser 36 having a diffusion angle of 5 °. The laser relay lens 37 is arranged at the output end of the holographic diffusion sheet 36, and the output end of the laser relay lens 37 is opposite to the beam combining lens 5. The light emitted from the holographic diffusion sheet 36 passes through the laser relay lens 37 and is reduced to form an image by 4.5 times, and the angle is enlarged by 4.5 times, so that the laser divergence angle at the target diaphragm 6 is 28.3 degrees, and the size of a uniform irradiation surface is 2.8 multiplied by 2.1 mm. Dividing the straight laser into a plurality of sub-wave surfaces by adopting a lens array 32, and then superposing the sub-wave surfaces at the exit pupil of a converging lens 34 for dodging; with reference to fig. 4, a holographic diffuser 36 is placed at the exit pupil of the converging lens 34 to further homogenize the light and enlarge the divergence angle of the laser light at the target diaphragm 6, and since the aperture of the collimator set 7 is Φ 150mm, the focal length f is 335mm, and the image space aperture angle is 25.2 °. Because the divergence angle of the laser is 28.3 degrees and is more than the image square aperture angle of the collimating lens by 25.2 degrees, the aperture of the collimating lens group 7 can be filled after the laser is emitted through the target diaphragm 6.

With reference to fig. 1 and 3, the black body 2 can emit infrared radiation, the infrared radiation of the black body 2 irradiates the infrared relay lens 4, the infrared relay lens 4 adopts an aspheric germanium lens with a focal length of 25mm and a caliber of 25mm, the vertical axis magnification of the infrared relay lens 4 is-1, the object numerical aperture NA is 0.25, and the aperture angle of the converged light beam is about 29 °. The base material of the beam combining mirror 5 is zinc selenide or zinc sulfide single crystal, the front surface and the back surface of the beam combining mirror 5 are coated with films so as to meet the requirements of light reflection with the wavelength of 1.06 mu m, light reflection with the wavelength of 1.57 mu m and light transmission with the wave band of 3-12 mu m, and the beam combining mirror 5 superposes and irradiates laser and infrared radiation on the target diaphragm 6.

With reference to fig. 1 and 5, the target diaphragm 6 is located at the focal plane of the collimator set 1, and may be in the shape of a circular hole, a triangle, a square, or the like, for simulating different types of targets. The collimating mirror group 7 comprises a plane reflector 71 and an off-axis parabolic reflector 72, the plane reflector 71 is placed at the output end of the target diaphragm 6, the off-axis parabolic reflector 72 is placed at the output end of the plane reflector 71, the reflecting surfaces of the plane reflector 71 and the off-axis parabolic reflector 72 are both plated with gold films, wherein the off-axis angle theta of the off-axis parabolic reflector 72 is 20 degrees so as to meet the requirement of reflecting light rays with the wave band of 1.06-12 microns, the focal length f of the off-axis parabolic reflector 72 is 335mm, the caliber D is 150mm, the off-axis angle theta is 20 degrees, and the off-axis parabolic reflector 72 can output parallel laser. Laser and infrared radiation pass through a target diaphragm 6 and are collimated by a collimating lens group 7, and parallel light is output, so that laser/infrared target radiation with a common aperture is simulated.

In summary, the laser/infrared composite target simulator disclosed by the invention compounds laser/infrared through the optical system of the laser/infrared composite target simulator to simulate laser scattered by a target and infrared radiation of the target, has the capability of simulating laser scattering power change of the target, has the function of simulating targets with different sizes, shapes and infrared radiation intensities, is additionally provided with the rotary table with a rotatable angle, can also simulate the characteristics of the target such as the moving direction, speed, acceleration and the like by matching with the rotary table, can be used for developing laser/infrared composite target simulator equipment, and realizes semi-physical simulation test of a laser/infrared dual-mode seeker.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.