CN112285912A

CN112285912A - Wide-angle optical system based on single lens

Info

Publication number: CN112285912A
Application number: CN202011183996.6A
Authority: CN
Inventors: 于鑫; 陈建发; 崔鑫磊; 初学莲
Original assignee: Luoyang Institute of Electro Optical Equipment AVIC
Current assignee: Luoyang Institute of Electro Optical Equipment AVIC
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-01-29

Abstract

The invention provides a wide-angle optical system based on a single lens, which is used for being matched with a detector to carry out laser warning. According to the wide-angle optical system based on the single lens, the specific wave band convergence imaging is realized through the two lenses, the wavelength resolution function is realized, and the space angle information of the incoming laser is resolved through the position of the convergence imaging image spot on the CCD. The alarm angle precision of the optical system provided by the invention is better than 1 degree.

Description

Wide-angle optical system based on single lens

Technical Field

The invention relates to the field of laser warning, in particular to a wide-angle optical system based on a single lens.

Background

In the military field, helicopters, transport planes, fighters and the like are easily threatened by serious lasers such as laser reconnaissance, laser range finders, laser guided weapons, high-energy laser weapons and the like, and a laser warning system can determine the position of a laser threat source, detect the characteristics of the lasers, judge the application and the threat degree of the lasers, provide reliable basis for the own party to take proper measures and is a necessary measure for modern airplane protection. The laser bands currently used for ranging and guidance are mainly 1.064 μm and 1.54 μm.

The imaging laser alarm is the main development of the current laser alarm technology, and the wide-angle lens is matched with a laser band CCD detector to realize the laser alarm with high spatial angular resolution. However, the existing warning system with a single wide-angle lens matched with a CCD cannot recognize the wavelength of the incoming laser, the imaging warning system generally recognizes the wavelength of the incoming laser through two paths of optical systems with different wave bands, and the volume and the cost of the warning equipment are greatly increased.

Therefore, it is desirable to provide a single-lens wide-angle optical system for laser warning, which can detect the spatial angle and wavelength of the incoming laser.

Disclosure of Invention

In order to solve the above problems, the present invention provides a single-lens wide-angle optical system for laser warning that enables wavelength detection of an incoming laser spatial angle.

The invention aims to provide a wide-angle optical system based on a single lens, which is used for being matched with a detector to carry out laser warning.

The wide-angle optical system based on the single lens is also characterized in that the lens substrate is a zinc selenide substrate.

The wide-angle optical system based on the single lens is also characterized in that the first lens and the second lens are machined on the lens substrate in a turning mode.

The wide-angle optical system based on the single lens is also characterized in that the front surface and the rear surface of the first lens and the second lens are both aspheric surfaces.

The wide-angle optical system based on the single lens also has the characteristic that the surface of the first lens is plated with a 1.064 mu m narrow-band light filter film.

The wide-angle optical system based on the single lens also has the characteristic that the surface of the second lens is plated with a narrow-band filter film with the wave band of 1.54 mu m.

Advantageous effects

According to the wide-angle optical system based on the single lens, the specific wave band convergence imaging is realized through the two lenses, the wavelength resolution function is realized, and the space angle information of the incoming laser is resolved through the position of the convergence imaging image spot on the CCD. The alarm angle precision of the optical system provided by the invention is better than 1 degree.

Drawings

FIG. 1 is a front view of a single lens wide-angle optical system for laser alerting provided in accordance with the present invention;

FIG. 2 is a rear view of a single lens wide angle optical system for laser alerting provided in accordance with the present invention;

FIG. 3 is a schematic diagram of an imaging optical path of a single lens in the optical system of the present invention;

FIG. 4 is a schematic diagram showing the correspondence between the optical system and the imaging area of the CCD detector according to the present invention,

wherein, 1: a first lens; 2: a second lens; 3: a lens substrate.

Detailed Description

The invention will be further described with reference to the following drawings and specific embodiments, and the advantages and features of the invention will become more apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.

In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1-4, a wide-angle optical system based on a single lens is provided, which is used for cooperating with a detector to perform laser warning, the system includes a lens substrate 3, a first lens 1 and a second lens 2 are processed on the lens substrate 3, and the axes of the first lens 1 and the second lens 2 coincide with the center of a corresponding use area of the detector. The lens substrate 3 is a zinc selenide substrate. The first lens 1 and the second lens 2 are machined on the lens substrate 3 by means of turning. Both front and rear surfaces of the first lens 1 and the second lens 2 are aspherical surfaces. The surface of the first lens 1 is plated with a 1.064 μm narrow-band light filter film. The surface of the second lens 2 is coated with a 1.54 mu m waveband narrow-band filter film.

The processing and forming on the substrate by turning means that turning is carried out on the zinc selenide substrate, two aspheric lenses are turned, the two lenses have the same geometric parameters, the radius of the front surface is-4.2884, the thickness is 2.15, the aspheric parameter A is-0.0322, the radius of the rear surface is-2.8993, and the aspheric parameter A is-0.0018/B is-0.0009. In the figure, Z is the optical axis direction, X is the azimuth direction, and Y is the pitch direction. As shown in fig. 3-4, the detector is divided into two parts in the 320 array direction, and the 160 × 160 region corresponding to the wavelength 1(1.064 μm) is the imaging region of the first lens; the 160 x 160 region corresponding to wavelength 2(1.57 μm) is the imaging region of the second lens.

In summary, the wide-angle optical system based on a single lens provided in the embodiments of the present invention realizes convergent imaging on a specific waveband through two lenses, realizes a wavelength resolution function, and resolves spatial angle information of an incoming laser by converging a position of an imaging spot on a CCD. The alarm angle precision of the optical system provided by the invention is better than 1 degree.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a wide angle optical system based on single lens for cooperation detector carries out laser and reports an emergency and asks for help or increased vigilance, a serial communication port, the system includes the lens base plate, processing has first lens and second lens on the lens base plate, the axle center of first lens and second lens and the central coincidence of detector corresponding use area.

2. The single-lens based wide-angle optical system of claim 1, wherein the lens substrate is a zinc selenide substrate.

3. The single-lens based wide-angle optical system of claim 1, wherein the first and second lenses are machined on the lens substrate by means of lathe-turning.

4. The single-lens based wide-angle optical system of claim 1, wherein the front and back surfaces of the first and second lenses are aspheric.

5. The single-lens based wide-angle optical system of claim 1, wherein the first lens surface is coated with a 1.064 μm narrowband optical filter.

6. The wide-angle optical system based on a single lens as claimed in claim 1, wherein the second lens surface is coated with a 1.54 μm band narrow band filter.